Re: [Elecraft] K3 Multi-Band antenna thoughts
Bill DX Engineering stuff is very well made and I wonder if perhaps some of the difference between theirs and the Elecraft BL2 is more a question of size. I'm wondering if you could be getting the same amount of heat in each balun, but the huge bulk of the metal-encased 10kW DXE product simply absorbs all you can throw at it, whereas the little Elecraft unit is only 2.5% of that. Your antenna sounds interesting. I wonder what the swr is at the bottom of the feeder on each band. David G3UNA - Original Message - snip Mike, I have been using the 130' Cobra Ultralite Senior Multiband doublet style antenna by http://www.k1jek.com for several years. I currently use it with my K2/100 and KAT100. The antenna comes with 100' of twinlead which I attach to a DX Engineering 10KW 4:1 balun (DXE-BAL-200-H11_C) at my window with a short run of RG 213/U coax to the K2/100 and KAT100 Autotuner. I tried using the Elecraft balun but it get very hot at 100W. The DX Engineering balun never gets even warm. The KAT100 indicates SWR match of 1:1 on most frequencies 160-10m with a maximum of 1.3:1 to 1.5:1 toward a band edge or two. My antenna is only 25' above ground suspended from and strung through pine trees. I routinely operate at 50W on all bands and have no trouble being heard. - Bill Strong WA5KPE Hattiesburg, MS K2/100 #4454 KAT100 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K3 Multi-Band antenna thoughts
Bill It is quite likely that the heating effect is different on each band and some bands will prefer a longer feeder than others. The swr that the matching unit provides is easy to measure but only tells us what the transmitter sees. W8JI has a lot to say on the subject. 73 David G3UNA I am sure you are correct in your idea that just as much heat is produced in the DXE balun as in the Elecraft balun but the heat is easily absorbed by the huge DXE balun. I do not have an analyzer to measure impedance at the base of the twin lead. All I can say is that the KAT 100 is able to provide very reasonable matches 160 thru 10. I have not used my Elecraft Balun lately but if memory serves correctly it did not provide as good matches at either 1:1 or 4:1 as the DXE does. Early on I tried shortening the feeder but ended up with the full 100' for best matching. If you would like I will run a series of matches on different bands and post the SWR readings from the KAT100. - Bill Strong WA5KPE Hattiesburg, MS K2/100 #4454 KAT100 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] OT Signatures, quotes, et. al....
Tried replying to you direct Dave G., but keeps bouncing. Is that '65 Mk III Sprite the little UK sports car known here as the bug-eyed Sprite? David G3UNA sorry for the 'Crafters' bandwidth Regarding quotes... I find no mention regarding this subject in the ELECRAFT email LIST GUIDELINES Para 5 and it's subsections, relating to quotes, etc.. I, for one, enjoy them as long as they abide by the guidelines My signature identifies me and where I am; the quote is my deliberate choice and may change with the weather ;-)). -- Dave G. KK7SS '65 MK III Sprite in Richland, WA Two things are infinite, the universe and human stupidity. But I'm not so sure about the universe. ... Albert Einstein. ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Rigblaster/Signalink for K3?
Sorry if this has been answered already: presumably, this can also be used with an SDR rx on the IF? David G3UNA The nice thing about an 'all-in-one' solution: 1) Just one USB cable connected to your radio. 2) Very high quality soundcard. 3) Winkeyer built-in. 4) Extra COM ports. 5) Monitor the audio. 6) One chunky cable from the unit to your radio. End result is a very tidy installation with a high-quality soundcard. Simon Brown, HB9DRV -- From: Dave G4AON [EMAIL PROTECTED] What does the K3 lack that a Rigblaster or Signalink provides? I use mine with MMTTY, N1MM logging/CW keying and DM780 straight to a sound card. The TX control in DM780 is via the normal serial cable, in MMTTY via a simple single transistor keying circuit built into the 15 way accessory plug. CW keying from N1MM logging is via the serial lead, I also have a K1EL Winkey which works fine too. The K3 has transformer isolated line in and line out sockets. ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Rigblaster/Signalink for K3?
I had in mind the cheap little add-on kits or even the Elektor rx. David G3UNA Not all - they have to be high-spec for this. You would probably want a dedicated soundcard for SDR anyway, also the newer SDR radios have a USB interface anyway. Simon Brown, HB9DRV -- From: David Cutter [EMAIL PROTECTED] Sorry if this has been answered already: presumably, this can also be used with an SDR rx on the IF? ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K3 mic socket
I too have that problem. The thick washer on the inside doesn't fit tightly to the front panel, so it's a loose fit. The connector flange protrudes through too far to put a lock nut on the front. David G3UNA K3 547 I am more concerned about the amount you can wiggle the mic connector. It is not locked to the metal front panel so the whole rigidity comes from the PCB it is attached to. If you accidentally bashed the mic plug while moving something on the desktop it seems to me you could possibly damage the front panel board. - Julian, G4ILO K3 s/n: 222 K2 s/n: 392 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] MH2 Mic
The manufacturer has used the wrong cable type, it will not get better with time. It should not be ordinary pvc. Send it back, there's a batch problem. David G3UNA - Original Message - From: DW Holtman [EMAIL PROTECTED] To: Ken Kopp [EMAIL PROTECTED]; elecraft@mailman.qth.net Sent: Thursday, March 27, 2008 2:38 AM Subject: Re: [Elecraft] MH2 Mic Ken, It is not from lack of use, it is very, very stiff. Best, DW Holtman WB7SSN - Original Message - From: Ken Kopp [EMAIL PROTECTED] To: elecraft@mailman.qth.net Sent: Wednesday, March 26, 2008 8:13 PM Subject: [Elecraft] MH2 Mic The MH-2 that I received with my K3 has ... in my opinion ... a really stiff coiled cord. It's capable of sliding the radio on the desk when the mic is held about 24 from the radio. At this point the turns of the coiled portion of the cord are (only) about 1/4 apart. Perhaps it just needs use 73! Ken Kopp - K0PP [EMAIL PROTECTED] ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Elecraft SSB Net on 40m - Calling Europe
I would be, but my times are very variable at the mo and my antenna would be NVIS, ok for local stuff David G3UNA ok, yes that's a bit late for me. Is there anyome in Europe interested in a K3 Euro SSB net ? -- ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] K3 programmable CW rise time
I wonder if it will be possible to shorten rise times as the keying speed increases without needing manual intervention. Only set the desired timing for one speed and the program fixes others automatically; or not as desired. David G3UNA ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] IF passband graphic
I wonder if this is related to the problems some have had setting the passband when operating WPX this weekend. David G3UNA ab2tc wrote: Is it just me or is the graphic display of the IF passband rather erratic? No, it's not just you. I find switching between lo/hi cut and shift/width clears it up. Regards, Paul. ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Crimped connectors
Hi Tom You make a good point. I say offer both and let the market decide. David G3UNA Tom said Every year on various forums this subject seems to come up at least twice. Every year the question is always answered by experts who always agree: If you’re using your rig in an F-14 – crimp. For home use – solder. Tom, AK2B -- ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] K3 audio and rf inter reaction
Mode: cw, paddle sending string of dots or dashes any speed power o/p: any, ie nil to max, dummy or antenna filter: any, but more pronounced 1kHz listening to side tone on phones or speaker audio control: max rf control: start low and raise until the artefact appears or rf: max audio: low and raise until the artefact appears at low speed the artefact sounds like a scraping noise riding on the string. High speed it's like an extra edge. Anyone confirm this, offer an explanation? David G3UNA K3 #547 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K3 audio and rf inter reaction
The effect is also present with monitor at zero. In this condition, a rushing sound is heard. At a guess I would say it is digitally induced noise. Mode: cw, paddle sending string of dots or dashes any speed power o/p: any, ie nil to max, dummy or antenna filter: any, but more pronounced 1kHz listening to side tone on phones or speaker audio control: max rf control: start low and raise until the artefact appears or rf: max audio: low and raise until the artefact appears at low speed the artefact sounds like a scraping noise riding on the string. High speed it's like an extra edge. Anyone confirm this, offer an explanation? David G3UNA K3 #547 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] K3 QSK artefact
This is a re-post to see if it attracts comment. This concerns an audible artefact using QSK cw mode. When either rf gain or af gain are at maximum, there is an additional noise which accompanies the Morse characters. This can be demonstrated as follows: Mode: QSK cw, paddle sending string of dots or dashes ANY speed power o/p: any, ie nil to max, dummy load or antenna, agc on or off, filter: any, but more pronounced 1kHz listening to monitor (side tone) on phones or speaker at ANY monitor setting audio control: max rf control: start low and raise until the artefact appears or rf: max audio: low and raise until the artefact appears at low speed the artefact sounds like a scraping noise riding on the string. High speed it's like an extra edge. The effect is also present with monitor at zero. In this condition, the artefact itself can be heard without tone from the Morse characters: a rushing sound is heard. At a guess I would say it is digitally induced noise. This effect makes my K3 unusable on QSK, but does not occur on semi bk-in. Anyone else heard this? I think there must be a fault on my K3. Please note, this is not receiver or band noise which is a long way down on this artefact. David G3UNA K3 #547 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Buddipoles and KX1
I agree: The best lengths for a doublet are 44ft and 88ft and multiples thereof. Have a look at Cebick's site. These lengths avoid nasty tuning conditions which can create large voltages and inefficiencies in your matching unit. 73 David G3UNA - Original Message - From: Romanchik Dan [EMAIL PROTECTED] To: Mailing List Elecraft elecraft@mailman.qth.net Sent: Sunday, April 13, 2008 11:19 PM Subject: Re: [Elecraft] Buddipoles and KX1 I have a KX-1 and a BuddiStick, although I haven't used them together yet. If you have the bulit-in antenna tuner, then there's no need to spend all that money on a BuddiStick. I have had success with the 28- ft. wire with four radials as described in the tuner manual. Last time I went portable with it, I built a 66-ft. doublet fed with twisted pair and strung it up between two tree limbs about 15 feet high. This antenna tuned up easily and worked really great. My simplistic theory is that the more wire you can get into the air, the better an antenna will work. The BuddiPole is a well-designed and built antenna, but I would think that my 66-foot doublet has got to be more efficientand much cheaper, too! 73! Dan KB6NU -- CW Geek and MI Affiliated Club Coordinator Read my ham radio blog at http://www.kb6nu.com LET'S GET MORE KIDS INTO HAM RADIO! ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Power pole for K3?
Lisa tells me that if you ask, you can actually buy the ready-made cable from Elecraft at $10. In my honest opinion you are well advised to order this with your kit. If you order the ready-built K3, this is what you get. David G3UNA Bill, Yes, the power cord parts are included with the K3 kit. This is one item that will require your soldering iron unless you have a good (ratcheting type) crimper for the Anderson PowerPole connectors and know how to properly crimp the connectors. 73, Don W3FPR Bill Maddock wrote: I have seen a lot of talk about the power pole connectors. Am I right in assuming that I will get a new power cord with my K3? I will be using an Astron 70A supply - a bit of over kill, but I currently run 2 TS-850S on it now. I also have 4 group 29 deep cycle batteries for backup with 2 80 watt solar panels and a charger controller. Ordered in Jnauary - getting antsy! 73, Bill N4ZI Munford, TN ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Power pole for K3?
The only thing not in the archive is that you can buy the ready-made cable from Elecraft for $10. K3$2-3000 Cable$10 Ship, tar, ha'porth. David G3UNA On Sat, 19 Apr 2008 13:50:32 +0100, you wrote: Yep, I confirm that. And we seem to be opening up an old thread again, all this has been cover at least twice before and it available in the archives. I agree. Let's not start that all over again... Tom, N5GE - SWOT 3537 - Grid EM12jq ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Dangerous Low Voltage
I insist on putting a fuse on each battery terminal, preferably fixed right to the terminal. The additional voltage drop is worth the peace of mind. Car radio shops have big chunky ones at modest prices. David G3UNA ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] OT W4RNL SK
Forwarding this to the Elecraft list, I know many of you will have known LB or at least his work. David G3UNA From the Antennex list: Folks: This is the saddest announcement we have had to make: It was discovered this morning that LB Cebik, W4RNL had passed away. He was a friend to us all and will leave behind a great void. His beloved wife, Jean passed several years before and he missed her greatly. He was my friend and associate for 10+ years and I shall always remember him for his warmth and kindness. A tribute to this kind and gentle giant shall appear in my column in the next issue of antenneX. Jack L. Stone, Publisher antenneX Online Magazine http://www.antennex.com [EMAIL PROTECTED] ___ Broadcast mailing list [EMAIL PROTECTED] http://lists.antennex.com/mailman/listinfo/broadcast Unsubscribe, send to: [EMAIL PROTECTED] ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] simple iambic paddle
As others have said, my first paddle was a hacksaw blade but take care of the sharp points! Better is a strip of pcb material, or 2 strips with a separator for iambic. From memory I used about 5mm wide and about 40mm from the fulcrum, which can be just a wood block with 2 slots cut and a screw through to pinch together. If you start to get ambitious, you could make the whole keyer/oscillator on the pcb, perhaps a TIC keyer. I did this to fit inside the base of a Norcal 20 with the paddle sticking out of the side to which I screwed a pair of Kent paddle handles. You could just shape the pcbs into large finger pads. David G3UNA - Original Message - From: Brian Lloyd [EMAIL PROTECTED] To: Elecraft reflector elecraft@mailman.qth.net Sent: Thursday, April 24, 2008 5:39 PM Subject: [Elecraft] simple iambic paddle Knowing the penchant for CW that many of you have, I thought I would ask the following question here. Does anyone have a design for a very simple iambic key that can be made with simple materials and hand tools? The kids are starting to send CW and I am finding they are having a LOT of trouble with a straight key. Most immediately gravitate to the bencher so I am trying to find a way to make a $5 paddle. Brian Lloyd Granite Bay Montessori School 9330 Sierra College Bl brian AT gbmontessori DOT com Roseville, CA 95661 +1.916.367.2131 (voice)+1.791.912.8170 (fax) PGP key ID: 12095C52A32A1B6C PGP key fingerprint: 3B1D BA11 4913 3254 B6E0 CC09 1209 5C52 A32A 1B6C ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] simple iambic paddle
I should have added how I made the contacts: I filed slots in the side panel and fitted M4 washers with M3 screws to give me some adjustability in contact spacing. That made for a rather hard contact, so, you might find a way of springing the grounding contact and it will be more comfortable. I found the pcb needed tinning with solder to make a good contact pad. David G3UNA As others have said, my first paddle was a hacksaw blade but take care of the sharp points! Better is a strip of pcb material, or 2 strips with a separator for iambic. From memory I used about 5mm wide and about 40mm from the fulcrum, which can be just a wood block with 2 slots cut and a screw through to pinch together. If you start to get ambitious, you could make the whole keyer/oscillator on the pcb, perhaps a TIC keyer. I did this to fit inside the base of a Norcal 20 with the paddle sticking out of the side to which I screwed a pair of Kent paddle handles. You could just shape the pcbs into large finger pads. David G3UNA ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: RE:[Elecraft] simple iambic paddles
Brilliant ! Beats my pcb method. David G3UNA How about paper clips? I made this one a while back and it works great. http://home.comcast.net/~fairbank56/clipper.jpg Eric N3EF ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] CW Mistakes
An old friend, G4AYP, now SK used to listen to 40m cw just before going to sleep using his Norcal 40. He tried to follow French and Spanish stations and said it kept his brain alive and stimulated. He was UK Director of Forensic Science, so I don't think it was an idle statement. David G3UNA Starting after age 50. Grin. Actually, research has shown that one of the ways to slow the aging process is to learn new things throughout life. Particularly things that are *very* different than what you've done before, not just extensions of existing stuff. 73 de Jim, N2EY ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K3--Trouble with Power Pole connectors
Wire the dc cable direct into the rig and let the other end do the disconnect. Less dc loss and no contacts to worry about. David G3UNA I know the powers that be don't like complaints about the APP, but, the Factory mounted APP's on my K3 had one of the blades recessed at least 1/8 inch from its proper position. Until I corrected this (which requires removing that side of the cabinet and the rear panel) my connectors would literally fall off from the weight of the short piece of power lead. It took more than three attempts to get both of the chassis mounted blades in the proper position. UN-SAT. They now stay together, but I would never put them in a rig I designed and am presently considering some type of replacement. Rich, KE0X ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K2 v K3
Similar to vinyl vs. cd David G3UNA Mike, I believe it is all in the perception. The K2 is all analog (unless the KDSP2 is active), but the K3 processing is digital. Each has its own advantages and artifacts to contend with. Analog can soften the background noise while the digital DSP can reproduce it 'in all its glory'. I equate this perception to the folks in the audiophile world who claim that vacuum tube amplifiers are better because they are 'warmer'. Actual measurement will show that solid state amplifiers can better duplicate the input waveform while vacuum tube gear adds 2nd and 3rd harmonic distortion to the output. To each his own. Remember that perception is 99% of reality. 73, Don W3FPR Mike Harris wrote: Hi, I put my K2 #1400 back on line last night to have a listen around 40M CW. I'm getting a bit fed up with one step forward, half a step back firmware upgrades and am giving it a rest for a while. Anyway, I was surprised just how nice it sounded compared to my K3. The audio seems softer and warmer somehow. Same bandwidth (400Hz), same phones. The K3 background noise just sounded harder, more harsh. I've had this feeling from day one. ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K3 Variable amp keying delay not long enough!!??
I would be tempted to replace the 120VAC relay with a dc relay and key it directly from the rig. Don't forget to fit a diode across it to squash the back emf. This may have other ramifications and might not be this simple, but it's well worth consideration. David G3UNA The FAQ for the K3 promised a 0-50 ms amp keying delay. We got only 0-20 ms in the latest release.I don't think 20 ms is enough in my case, based on my primitive research. Several experts have said mine might need as much as 30-35 ms. My amp's relay is a 30 yr old Potter Brumfield open frame model with a 120vac coil. To make things worse, since the K3 will not switch 120vac, I must use another relay with a 12vdc coil in the line between the K3 and the amp, which in turn pulls in the PB relay. This exacerbates the matter by taking even more time, and I'm afraid to try anything for fear it will damage the K3 and the amp. Am I wrong?? Anyone care to comment?? One of the many reasons I bought the K3 was to be able to operate at least semi break in CW and VOX with my old amp without hot switching, by virtue of having ample switching delay. I've waited months for the feature and am disappointed.. However, I hasten to add this: As a K2 user/owner/builder, I expected much in the K3. I got much more than I expected. I gave up a nice Icom Pro 3 for the K3 and don't miss the Pro 3 one iota. The K3 is unbelievable in what it can do and how superbly it does it. And getting new firmware is icing on the cake. But I sure wish I had 0-50ms amp delay capability! How about it, Wayne? George, N4YM K2 # 4758 K3 # 340 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K3 Antenna 1/2 Operation
I agree completely David G3UNA I am one of the people who requested that the ATU active / bypass settings could be stored along with ANT 1 / 2. The reason was that the antenna I don't want the ATU in circuit for is externally tuned. I still need to put out a tuning signal, and I guess that having the ATU in circuit might confuse the SWR readings when I am tuning. At the back of my mind I was probably also thinking that the KAT would auto-retune in the presence of a high SWR, like the external SGC tuners do. Even though there is a workaround of tuning the ATU into 50 ohms, I would still like to have the ATU in / out settings stored. The reason is that I have to remember which of two TUNE buttons to press depending on which antenna I am using. If I am using the externally tuned antenna and the ATU is active and I press ATU TUNE instead of TUNE by mistake, the KAT will try to match the antenna, and my previous adjustment of it into 50 ohms will be lost. If the ATU is automatically bypassed when I select the antenna that doesn't need it, nothing happens if I press the button in error. And believe me, I often press things in error. - Julian, G4ILO K3 s/n: 222 K2 s/n: 392 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K3 Shipping to UK
I gave my firm's address, so it came all the way by UPS and what's more they didn't want the VAT in advance, it just went on the monthly VAT import bill to my firm, so I got more time to pay and no delay. This is probably a tip ! David G3UNA ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K3 in Iraq
My temporary antenna is a low doublet up 15ft max and bending around the garden for 88ft per leg, this passes thro the wall in nylon tubes then by a few feet of ladder line to a PL259 on the back of the K3, no coax, no baluns. The auto atu makes a good match top to ten. Regularly hear Stateside early mornings on 80m, from northern England. David G3UNA I case you wanted to know: YI9FMW is now set up (minimally, someone forgot the balun and coax...) on 40m. Once it gets dark in the US (1900 EST?) I'd like to see if I can reach any other elecrafters. Right now I've got a makeshift extended Zepp, with military commo wire acting as makeshift twinlead. With help from you all, I'd like to get up and fully operational. And what I mean by that are any suggestions you might have in terms of antenna design, given limited means. and hundreds of feet of military commo wire or best practices in pulling you out of the noise given what you know about your K3, all modes. I'm here to experiment as well as get folks nifty qsl cards. -- ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] USB on all bands ??
Way before his time: that little ditty is ascribed to Robert McCloskey, State Department spokesman, Vietnam war era. Used by many since, like so many good sayings. Churchill was good at it too. David G3UNA Thank you Alan Greenspan!! Doug W6JD -- Original message -- From: Lyle Johnson [EMAIL PROTECTED] Thank you for the clarifications Ian. ... All it needs to swap sidebands is a few changes from + to - in the DSP code, and to link that to the band selector. It's all done for us in the K3... but are you *sure* you got those signs right, Lyle? :-) I know you believe you understand what you think I wrote, but I am not sure you realize that what you read is not exactly what I meant. :-) 73, Lyle KK7P ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K3 Flat Audio?
I'm not familiar with SR5, but the peak at 1600Hz MAY be deliberate: this has been used by some to increase readability in voice channels, though, not sure if this is good in the presence of high noise as on HF. David G3UNA - Original Message - From: n4lq [EMAIL PROTECTED] To: Elecraft@mailman.qth.net Sent: Saturday, May 24, 2008 11:50 PM Subject: [Elecraft] K3 Flat Audio? Someone kindly mentioned SR5 here so I downloaded it and observed that my audio from the K3 had a pronounced peak around 1600 Hz. I compensated for this by adjusting the K3's RX equalizer so that EQ (6) is -4db, EQ (7) is -4db and EQ (8) is -2db. I now have a flat response across the spectrum. QRN is less distracting now. Also, my waterfall on MIxw is nice and even all the way across now. This isn't very scientific. I was just using band noise to adjust the EQ for a flat response but since band noise is what I'm dealing with, I felt it was adequate. Question is: Has anyone else noticed this? Do you think it's something to do with filter shape? Maybe the audio amp. is indeed flat but the filters aren't and I'm compensating for them. WhateverI'm just glad there K3 has that nice EQ! N4LQ Steve Ellington [EMAIL PROTECTED] ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] OT: We're on Mars!!
Tell us about it David G3UNA If you guys are excited, you can only imagine how some of us who have hardware on board feel!! Al WA6VNN ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K2 PA and 232 problem
Nice work, Bob. I've seen 78 series regulators die with over voltage but never over current or temperature, they have excellent protection for those. David G3UNA - replace the 78L05 as its not clear how much abuse it had suffered. 73 Bob G3PJT ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K3: too easy to overwrite dial memories
Would your rule be covered if you had to hold in another button at the same time as hitting the memory button? Or, say, turn the power to zero before making memory additions... David G3UNA In the world of ergonomics and man-machine interface design, there is a rule: If an action will destroy information or a state than cannot be restored with the same effort that it took to destroy, then the system requires either (a) a Un-Do function of equal simplicity, or (b) a confirmation step. The choice between (a) or (b) depends on the consequences of the unintended action during the time it takes to recover. For example, a (hypothetical!) button that shuts down the jet engines on an aircraft requires a confirmation step... because turning off the engines until the pilot hits UnDo would be bad! This rule applies to software as well as hardware. -- Eric K3NA ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Using the V6.2 lite Softrock Rx as a panadaptor with Elecraft K3
Another SDR is advertised by Elektor http://www.elektor.com/ GBP72 for the assembled and tested pcb. David G3UNA ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] soundcard checker for SDR
I came across this in Elektor which folk might want to try with their sound cards. Go the www.elektor.com site and log on as a new user, which will allow you to download quite a few articles free, after which you have to pay. Find the June 2007 issue and then the SDR Soundcard Tester article. The SDR article is in the previous issue. You will need to install some software to display the results. The article points to I2PHD but there seem to be several about. It's just a 15kHz 555 oscillator with 2 r/c outputs of opposite phase. These are applied to the sound input of your pc which will then display the results to determine whether anti-aliasing filters are required/satisfactory. It looks fun. David G3UNA ps no pecuniary interest ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K3: Power cable question
Glad you raised that point, Brian. In my Sunday school classes I ask the question: what does the fuse protect? It's a revelation to all when I give the right answer. On our 240V distribution system, a melted cable can lead to a severe shock hazard and I'm guessing that in the 110V centre-tapped system since the shock hazard is so much less, the next major hazard is fire, so, I've often thought that we are protecting against 2 hazards, each with a different emphasis in each case. In a 14V dc distribution system there is no real shock hazard (SELV), so the remaining hazard has to be fire, so, a slow fuse is not a problem, since heating effect in the wiring is so much slower. Anyone care to comment/add? David On Jun 16, 2008, at 9:59 PM, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: A regular fuse should blow at 2.6 x the rating within 30s, in other words very slowly. It's only a short circuit that will normally blow a new fuse. Have not seen any data on old fuses which might get metal fatigue. There are faster fuses, but the fastest are rf transistors - on three legs anyway... Most people don't know that the purpose of a fuse or circuit breaker is to protect the power distribution wiring, not the electronic component itself. Wire will carry a surge without too much temperature rise. The idea is that the fuse will blow or the breaker open before there is any chance of damage to the wire. This means that a fuse or breaker cannot protect your active devices. If you want that level of protection you need something like a power supply with fold-back current limiting. Brian Lloyd ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Second Receiver Discussion
I'm hoping to do some experimentation with diversity reception to significantly improve weak signal reception and reduce QSB. Something I know very little about and want to learn from those who have done it with other more elaborate systems: I hear the K3 offers most, if not all of what is needed in one package. David G3UNA Would someone like to expound the virtues and advantages of adding the second receiver to the K3? I want to know what I could gain from have a second receiver in the K3. ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K3 Bad Filters
I find it difficult to believe that a filter will go bad between manufacturer and customer. Perhaps the odd one in 1000 might get past the manufacturer's test regime. Modern surface mount components and hybrids are very sturdy and no postal service could impart sufficient vibration or shock to these devices to cause damage, particularly as these are soft-packed to absorb shocks. It's even more improbable that it could change the performance by just a few dB that all but the best test equipment could reveal. I am not able to test that the filters I purchased are up to spec, but if there have been significant numbers of failures (and the extraordinary failure of one in a reviewer's sample), I'm coming to the conclusion that filters should be returned to be re-tested, since the recent history indicates a faulty test and / or manufacturing regime. INRAD is a well-respected manufacturer, so, for Elecraft to re-test their work (with all the calibration problems that engages) is a plus for our confidence in the final product but a distinct fear that those filters produced prior to this time are statistically more likely to have failures amongst them. Eric, is this something Elecraft could offer? David G3UNA That Elecraft is testing the filters now is a good thing! I remember a post from Elecraft a few months ago, that said that I should not use the 8.2M IF filters that were intended for Yaesu's FT1K because the filters for the Elecraft K3 were specially selected to get top performance. The recent messages of bad filters, 8-pole and 5-pole, seem to contradict that. Or do filters break down during transport? Anyway, awaiting my new K3 with several filters within a few weeks from now, I expect that my filters are thouroughly tested for flatness, good imd-performance and are handpicked for top performance As promised. Or is this an impossible, strange question? Then please say so. 73 Arie PA3A K2 36..something We do now! Originally all 8 pole filters were supposed to be 100% tested at INRAD's supplier. When we discovered some bad ones had gotten through, we added 100% testing at Elecraft and at INRAD in Aptos. 73, Eric WA6HHQ ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K3 Bad Filters
Well, the radio seems ok, but there will be occasions, such as operating near to very strong in-band signals when it may perform less than satisfactorily and it is hard to identify what is happening. There may well be artefacts that are disturbing and only heard on odd occasions such as this and reduce the effectiveness of the radio in a contest for instance, and it is difficult to reproduce those conditions on the bench, ie multiple very strong signals near a weak one. I know someone who receives 55-60dB over 9 bc signals on 40m and the K3 probably cannot cope with this. I think the point about making standardised measurements is that they are standard, but most of the time you wouldn't notice if you were compliant or not. In days of old when assessing military radios returned for service, it was established that 60% failed the spec and were not reported by the operator for those failures. So, I think I would like to know that my radio is compliant with its spec then I can look elsewhere when a problem occurs. David G3UNA If nothing is obviously wrong with the radio, I can't see the point of returning filters to Elecraft for testing, especially all the way from the UK (and at whose expense?) and being without a working radio for a couple of weeks, in all likelihood to prove that nothing is wrong with them. Normal component variations will account for slight differences in the performance of individual radios in any case. Some of us will have a radio that is at the low end of certain specification ranges, and others will have one at the high end. Some may have a slightly better performing receiver but a slightly worse performing transmitter, or vice versa. But I very much doubt if you could tell the difference between them if they were side by side, without the aid of a lab full of test equipment. These test results just encourage people to obsess over differences in performance that probably can not be discerned in actual on-air operation. As far as I am concerned, if my K3 seems OK to me then it *is* OK. - Julian, G4ILO K3 s/n: 222 K2 s/n: 392 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] K3 - SMT mods
One thing I haven't heard mention so far: I believe these boards are made to the latest ROHS, therefore lead-free solder is used, therefore the de-soldering temperature is higher than some irons might be capable of. At my place of work we had to replace all our irons with higher temperature spec versions and we use 385C for manual soldering. Can't remember what the de-solderer uses. For the odd job you have to do, it might not matter very much or might seem slow. That could be a bad thing because you don't want the iron to linger on the joint for longer than is necessary, this can lead to track-lifting. As far as amateurs are concerned, replacing with a new part does not need the same solder as the manufacturer used. You can use your regular solder or paste as before at the temperature you used to use. David G3UNA ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K3 RX eq for CW
Add my name to that, for future firmware addition. David G3UNA So RX equalization is most useful to those of us who like a wide CW filter b/w. Yes, Bud, it would be very nice if the RX eq was mode specific. 73, Drew AF2Z ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] OT: K3 and antenna questions
I run a 2 x 88ft doublet straight into my K3 and it matches top to 10 David G3UNA ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] OT: K3 and antenna questions
It's temporary, but works fine for now. I drilled 2 holes in the bedroom wall and slid 2 lengths of nylon tube therein, they stick out a few inches outside. A piece of 450 ladder line about 3 ft or so goes from the PL in the rig to a connector block on the inside wall and the 2 wires from outside feed thro to that. Height above ground is about 15ft at this point. One wire goes to the bottom of the garden about 3ft up, then thro a rt angle for about 6ft rising to 4ft or so. The other wire bends at about 80deg and drops to 8ft at the garage barge board, then thro rt angle down between the houses to a tree at the front, about 6ft up. Wire is 20swg SnCu used on several projects. BTW no rf or any other kind of earth on rig. Occasionally hear US 80m ssb early morning. No balun; after initial tuning the K3 remembers its settings and changes instantly on band change. I think I asked it to fine tune on a couple of freqs but can't remember which. I'll try this for the cubscouts with longer feeder for JOTA and see how it works inverted V style. David G3UNA - Original Message - From: Jim Wiley [EMAIL PROTECTED] To: elecraft@mailman.qth.net Sent: Thursday, July 03, 2008 6:44 PM Subject: Re: [Elecraft] OT: K3 and antenna questions David - How high is it? What kind of feed-line are you using? How long is the feed-line? Do you use a balun at the antenna or at the transmitter end? Does the K3 auto-coupler show any symptoms of having trouble matching one or more bands (long tuning time)? - Jim, KL7CC David Cutter wrote: I run a 2 x 88ft doublet straight into my K3 and it matches top to 10 David G3UNA ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Antenna Recommendations for the K3 ATU
This is what I posted yesterday. You might look back in the Elecraft archives for similar postings from others: I do agree with Simon about verticals , if you are *close* to the wet, they will perform exceedingly well. My antenna is very simple, just wire. It's temporary, but works fine for now. I drilled 2 holes in the bedroom wall and slid 2 lengths of nylon tube therein, they stick out a few inches outside. A piece of 450 ladder line about 3 ft or so goes from the PL in the rig to a connector block on the inside wall and the 2 wires from outside feed thro to that. Height above ground is about 15ft at this point. One wire goes to the bottom of the garden about 3ft up, then thro a rt angle for about 6ft rising to 4ft or so. The other wire bends at about 80deg and drops to 8ft at the garage barge board, then thro rt angle down between the houses to a tree at the front, about 6ft up. Wire is 20swg SnCu used on several projects. BTW no rf or any other kind of earth on rig. Occasionally hear US 80m ssb early morning. No balun; after initial tuning the K3 remembers its settings and changes instantly on band change. I think I asked it to fine tune on a couple of freqs but can't remember which. I'll try this for the cubscouts with longer feeder for JOTA and see how it works inverted V style. David G3UNA Hi I'm setting up a station after many years absence from Amateur Radio and hope you may be able to help. I would appreciate other users experiences of antennas they have connected to the K3 ATU and any opinions on the best antenna to use with the K3. Any guidance would be greatly appreciated. With kind regards to all, Allen Allen J. Gawne, Keristal House, Port Soderick, Isle of Man IM4 1BJ Telephone 01624 624869 or 07624 461975 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K3: KRX3 question
I think I must be missing something. As I understand it, the additional crystal filters are only really necessary when operating with very strong adjacent signals in the passband. So, if you don't have a need for rejection of such strong signals, let's say 40 over S9 (somebody correct this figure please) then you don't need these extra filters, the DSP will cope with these large signals. The filters are only there to prevent overload of the DSP. Therefore, to perform the very best diversity reception in 40 over S9 conditions, turn off those extra filters in configuration menu. Having turned off the filters, I can engage the attenuator to avoid DSP overload if needed. Yes, I know it also reduces the signal I'm trying to hear, but that sacrifice may be what is needed. For diversity reception using low gain loop, pennant, flag, Beverage, loaded whip antennas, the signal input is very much lower than from the tx antenna, so, crystal filters are probably not be needed at all. Or do I have it all completely wrong? David G3UNA ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K3: KRX3 question
Bill I don't follow how filter offsets degrade oscillator tracking, ie to make a beat frequency. Sorry if I'm being thick. David G3UNA What would be the effect of unmatched filters? You would have a beat frequency, such as I mentioned with Orion above, which would be the difference in the two offsets. Even with identical offsets, you could also have interesting effects if you used different bandwidth filters. This might not necessarily be bad since you could use both a wide bandwidth and a narrow bandwidth simultaneously (somewhat like DUAL PB presently in the K3 but with much more flexibility). It will be fun to experiment with some of these things! 73, Bill ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: Re: [Elecraft] Hearing the effect of narrower roofing filter
The reason I'm particularly interested is because I fancy doing diversity reception and de-select my roofing filters in the main rx so there is no phase shifting relative to the second rx without filters. Have you de-selected the roofing filters to do a comparison with and without? David G3UNA When I adjust the filter width knob, I'm most definitely hearing the combined effect of the DSP bandwidth reduction and the change in roofing filters. But, since I can change DSP without changing the roofing filter (by stepping from 1500 Hz down to 550 Hz) I can get a good feel for how the DSP filter sounds. Then, stepping to 500 Hz, I can see the combined effect of one more DSP step plus the insertion of the 500 Hz roofing filter. The observed big change from 550 Hz to 500 Hz is *mostly* due to the roofing filter. - Keith N1AS - - K3 711 - ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: Re: [Elecraft] Hearing the effect of narrower roofing filter
But if you leave the setting at its nominal, can you hear the difference as that bandwidth is selected? I'm not sure I understand the advantage you are gaining by bringing the crystal filter in later; I'll do if there's something to be gained, it sounds an interesting approach. David G3UNA A couple of related points, which may not be new news to anyone: You can set the K3's filter bandwidth configuration to cause the roofing filter to switch at points other than the bandwidth printed on the filter. Maybe you would like your (nominally) 500 Hz filter to switch in at 450 or 550 Hz. My 8-pole 250 Hz filter is a bit broader than 250 Hz, and I've set it to switch at 300 Hz. You can also turn off a filter (set its bandwidth to zero temporarily) to evaluate whether a change you're hearing is due to the roofing filter or the change in bandwidth provided by the DSP. And you should attempt to adjust the filter gain compensation so that there is no change in the volume of the note you're tuned to. Rene, who guides the assembly of K3s built by Elecraft, told me that he uses a voltmeter on the speaker terminals when adjusting the gain compensation and can get usually get within a half decibel. I notice a definite qualitative change as the narrower filters switch in. It sounds quieter, and it seems like the volume is being turned down. I think I'm responding to the reduced low and high frequency components that are supposed to be cut off. The DSP-related changes seem more gradual. Dick, K6KR ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] OT: RFI from Front Loading Washing Machines
Leigh From your research, would you conclude that the machine did not comply with emc regulations? This sort of problem is, as we all know, common with many imported computers, shipped with filters designed in but obviously missing. Is this a sign that industry in general is prepared to save a few $ per machine and have very few complaints from their customers? After all, as a proportion of the population, how many would notice? David G3UNA I posted an eHam article about this a couple of years ago. (In fact, if you do duet rfi on Google you'll find me pretty quickly.) I get about two messages a month from hams who have the Whirlpool Duet series and have terrible RFI problems. Universally, when I advise they call Whirlpool and complain, they report back that they were told that they were the first person ever to report the problem. On eHam, someone responded with his own article and I took the suggested steps: AC line filter, better ground, some ferrites and wire re-routing inside the washer. Plus I partially remodeled my house, put in a new ground system, and put in a tower and yagi. The noise went from S9+60 to S3. An improvement only by comparison. Along the way I spoke with engineers at Whirlpool, received a whole complete set of new innards from them, and did a lot of other research. Despite their willingness to talk to me on the phone and send me parts (which didn't help) I think th best solution is to buy something else. Leigh/WA5ZNU __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Good experiance using the K3-100 on battery power
I used a Honda on field day a few years ago, (240V mains outlet) and was staggered by the amount of SMPS noise. I fitted a big filter grounded local to the generator about 60ft away that made it tolerable. David G3UNA - Original Message - From: Wes Stewart n...@yahoo.com To: elecraft@mailman.qth.net; M0XDFDavid Ferrington m0...@alphadene.co.uk Sent: Friday, September 11, 2009 5:40 PM Subject: Re: [Elecraft] Good experiance using the K3-100 on battery power --- On Fri, 9/11/09, David Ferrington, M0XDF m0...@alphadene.co.uk wrote: Nice, has anyone tried running the K3 (or other rig) directly from the DC outlet of a Honda generator? 73 de M0XDF This is supposed to be a battery charging source. I wouldn't even subject my batteries to this except in desperation. Definitely not my radios. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] K3 Check Your Buttons
A quick look at the circuit diagram shows that buttons are taken from a potential divider to CD74HC4051M inputs. These switches (unless I've misread the diagram) will therefore take the input current of the multiplexer which is typically 1uA. I don't know the spec for the Elecraft switch but a similar one requires a minimum current of 10uA. This should be checked more rigorously, but it might indicate a potential problem. David G3UNA Subject: Re: [Elecraft] K3 Check Your Buttons Paul, I am very surprised that this has not come up before! My K3 is #570 and it has had 4 front panel boards (a couple for what I called flaky or just bad switches and the rest for other reasons) and the same problem you describe is still there. The latest one is the best, but I still get some strange things happening - mostly with the BAND and MODE switches, but it has occurred occasionally with other switches, and it is not very reproducible - it can be very intermittent, or it can happen fairly often. When the K3 went back to Elecraft the beginning of the year for a different problem they checked out the Front Panel switches and said the switch operation is fine, but it's not. I have seen the problem on a fairly new K3 owned by a ham near here I have seen the problem on the K3s at the Elecraft booth at Hamcom. Again, it is intermittent. For the longest time I figured it was me and the way I press the buttons on #570 I did try SW test and Sca Adc - at times the beeps were slow, unevenly spaced or did not appear at all and it did not seem to me that the switches with flickering scan codes were the switches that were causing mis-operations. But when I press and hold the ALT to switch sidebands, and the radio changes three modes, maybe a band, reverses sideband and turns on the RX ANT, it causes one to wonder but K3support does not have any of these problems! So I have decided that the K3 switches are a trade-off to have the best receiver that is out there in the Amateur market. And so are the several other operational quirks, but again I can put up with those when and if they come up to the top of the upcoming K3 features list. Like you, I'm out of warranty, so $400 is out of the question for yet another Front Panel board. Besides, I don't think it can be fixed. 73HankK8DD __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] RFI noise
A different approach might work better: what these firms are practising is fraud or misrepresentation and we get a lot of that over here. Passing it off as something which it is not as any other consumer goods is illegal. It's also illegal to use an agency sticker like that. Over here we have the Sales (Descriptions) Act, but it's still a headache getting anyone to do anything about it, but it is another lever against the seller and/or importer. David G3UNA I lost a PC power supply, ordered a pair of replacements from Tiger Direct. They were neither half-KW monsters nor their cheapest supply. It had VDE/UL/FCC stickers, ALL of the agency certifications. . It seemed pretty clear the supplies had passed agency approvals with the filter components in place, but once they had the sticker they stopped putting those parts on the board. Bill - W7AAZ __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Any solution to the audio blast issue yet ?
A peak limiter combined with a fast short or open circuit is the only way to prevent ear damage. I've listened to earphones protected by vdr and, although the peak voltage delivered to the headset is limited, the waveform simply flattens off and the audio power pulse is still deafening. This problem I think is addressed by telecom users eg in call centres and has been around a lng time. One of these days I'll make a little outboard suppressor to use with my headphones where-ever I take them. David G3UNA If I may chime in here, I hope very strongly that nobody is using deep- in-the-ear type earbuds with the K3 or any other radio. TO DO SO MIGHT RUIN YOUR EARS. 73, Oliver Johns W6ODJ __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Any solution to the audio blast issue yet ?
This is an interesting site and they are keen to promote hearing health. http://www.headwize.com/projects/limiter_prj.htm David G3UNA snip If I may chime in here, I hope very strongly that nobody is using deep- in-the-ear type earbuds with the K3 or any other radio. TO DO SO MIGHT RUIN YOUR EARS. 73, Oliver Johns W6ODJ __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] An interested link
There might be 2 distinct problems: a) the bandwidth of the signal you think you have and b) splatter caused by over-modulating and over-driving. Starting with a wide-ish signal of say 6 or 7kHz, ie dsb full carrier might be ok in uncrowded bands, but add badly adjusted modulation and drive to another badly adjusted amplifier (a non-linear linear amplifier) and you've got double trouble that can be heard across the world even worse than over-driving ssb. Couple that with the sort of drift those boat-anchors are capable of and I can see why they have a bad reputation. All of which can be corrected by proper adjustment which takes more skill and understanding not now taught. David G3UNA Fortunately the K3 is quite good on AM transmit, unlike legacy equipment often used. I don't know about elsewhere, but here in the UK there are 80m AM nets where some of the stations run original AM gear without any additional audio filtering, one was measured at +/- 12 KHz by a fellow ham with an SDR receiver. The operator seemed indifferent to the fact his transmission was excessively wide and carried on regardless. The guy who measured the wide signal used home built AM gear himself, but had a multi-pole active filter of a similar specification to that used by broadcast stations to achieve their skyscraper envelopes as seen on a panoramic adapter or SDR receiver. The UK license has the clause The bandwidths of emissions should be such as to ensure the most efficient utilisation of the spectrum. 73 Dave, G4AON K3/100 #80 Joe, W4TV wrote: Similarly, AM - except for legacy equipment - should be limited to 6 KHz bandwidth. In other words, the maximum modulating frequency should be set at 3 KHz - or no more than 3200 Hz. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Elecraft] Incredible Radio Tales
The way I did it was to point at the link on that site and right click, save target as...and put it in a convenient file. When it has downloaded, it can then be played back. I haven't listened to all of it but it's good so far. David G3UNA - Original Message - From: Nels Nelsen nels.nel...@gmail.com To: elecraft@mailman.qth.net Sent: Monday, October 05, 2009 6:34 PM Subject: [Elecraft] Elecraft] Incredible Radio Tales This is all I got from the link: IRT mp3 file: I'm sorry to report that the large size of the IRT mp3 file and the number of downloads has exceeded the data transfer limit of our Web site. This it is no longer available here. We're looking for a new way to make the file available. Regards, Richard Dillman ddill...@igc.org Can any one from this list host this file? NE7LS __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Shorthand
I can see how c = yes, derived from confirm = cfm, but when I was a marine op it was y = yes David G3UNA - Original Message - From: Bruce Beford bruce.bef...@myfairpoint.net To: elecraft@mailman.qth.net Sent: Sunday, October 11, 2009 6:03 PM Subject: Re: [Elecraft] Shorthand Here's a good list of CW abbreviations. I am sure there are others. 73, Bruce N1RX http://www.kent-engineers.com/abbreviations.htm __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Shorthand
I agree with others that on the amateur bands we use R or EN for yes. Thanks for the correction. David G3UNA - Original Message - From: Lee Buller To: David Cutter ; Elecraft Reflector Sent: Sunday, October 11, 2009 9:39 PM Subject: Re: [Elecraft] Shorthand Actuallythe c come from Spanish. At least, that is what I always thought se senior or yes mister Lee K0WA Making up life as I go :) I can see how c = yes, derived from confirm = cfm, but when I was a marine op it was y = yes David G3UNA __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] UK Elecraft Net
Hi Ian
Wish I could join you; however, clocks go back 2am Sunday, so, z = local
time; winter is coming... :-{
73
David
G3UNA
Hi all,
I will be running the net as usual on 3.658 +/- QRM this Sunday. I don't
think the contest should bother us at 09:00 local (08:00z)
I hope to see you there.
73 Ian
--
Ian J Maude, G0VGS
SysOp GB7MBC HB9DRV-9 DX Clusters
Member RSGB, GQRP 9838, FISTS 14077 | K3 #455
http://www.amateurradiotraining.org
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Re: [Elecraft] K3 - CQWW SSB Observations - R U kidding?
Putting several in parallel on a suitable outboard heatsink is not expensive and, properly rated, will cater for any load. As with semiconductors, the trick is to not exceed the junction temperature. As always, follow the manufacturer's recommendations then add your own fiddle factor. MIL 217 taught me a lot. David G3UNA We've drifted off this thread subject somewhat, my apologies. Dave, I can vouch for that statement. I do use the Caddock Thick Film 50 ohm resistors as precision dummy loads. They are flat up to 500 MHz with good mounting using no leads. They MUST be mounted on a heat sink, and yes, they will go open in a flash if the rated power is exceeded (don't bother to ask me how I know that). So, recommending them for a K3 application may not be the best, but if you want an inexpensive dummy load, got a heat sink from a defunct computer CPU cooling device and one of those resistors and connect it to a BNC or UHF jack using zero length leads - but don't exceed its power rating (they are available up to 100 watts). 73, Don W3FPR David Gilbert wrote: Metal film resistors are notoriously fragile. They will typically meet their published dissipation specs just fine, but they go from being OK to being an open in a flash (literally) when overstressed. I personally would never use one in any application where the power they were expected to handle wasn't rigid controlled. Check with any industrial control manufacturer and you will hear the same story. 73, Dave AB7E __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] K3 Diversity use with QRN
I have a QRM Eliminator by SEM (a UK firm long gone) awaiting repair and I wondered how best to use this in conjunction with diversity. It is a phasing unit requiring another small (probably vertical) antenna to pick up local QRN, which is theoretically cancelled using its 3 controls. I think there are other similar products on the market. I'm thinking to combine this with another rx antenna which would then feed the rx port of the second rx on the K3. It needs a little thought. David G3UNA __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Noisy K3 receiver
I completely agree and it was the same revelation for me when I first switched on my K2 on 80m sat next to a FT1k at G6MC contest station: simply astonishing. David G3UNA I've read all the posts in this thread and have to say ... I just don't get it. What noise?! If anything my two K3s are too quiet! It has occurred to me more than once that I might have an antenna disconnected or perhaps blew out the front-end to the radio. The most distinguishing characteristic of the K3 (for me) is how quiet it is when you slip on the headphones. The K3 is distinctively quiet compared all the Icom, Yaesu and Kenwood radios I own or have operated. I now realize that all the pre-K3 radios I've used were somehow amplifying or emphasizing the band noise, plus adding a bunch of digital artifacts, in the audio. I am completely stunned by the posts here that report noisy K3 receiver and escaping to a quieter Japanese radio. . W4ZV has posted on this reflector several excellent explanations on how to properly adjust the K3, or any radio for that matter. I would love to hear one of these noisy K3 receivers and see how they are configured. Ed - W0YK --- __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Spurious
Jim I know of a military amplified loudspeaker which *should not* suffer from RFI, since it passed the required emc specs for land vehicles. They're nothing like $3000, but certainly not really for amateur budgets. Starting with a metal enclosure helps a lot. I have a few rejects if anyone is interested - off list. David G3UNA - Original Message - From: Jim Brown j...@audiosystemsgroup.com To: elecraft@mailman.qth.net Sent: Tuesday, December 22, 2009 6:30 PM Subject: Re: [Elecraft] Spurious On Tue, 22 Dec 2009 11:20:48 -0600, Tom Hammond wrote: I personally prefer UNamplified Motorola Mobile speakers, available regularly on EBay for $10 or less. Yes The AMPLIFIED Motorola speakers are also good, but require external power. I haven't seen any of these. BUT -- be VERY cautious with amplified speakers. In my short life (68 years), I've seen a LOT of amplified speakers, and I've only seen one that didn't suffer from RFI. It cost $3K. 73, Jim K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Source of mating ACC cconnector (K3)
Be nice if we could order from Elecraft, especially from outside US, along with other bits on order. David G3UNA __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Source of mating ACC cconnector (K3)
There are various sources in the UK and Eu, but I was thinking about folks around the world not as fortunate as us with in-country suppliers. In my view it should be possible to buy all connectors and cables from the main equipment supplier who will then have no problem guaranteeing their own product with quality parts. A one-stop shop if you like. David G3UNA - Original Message - From: Julian, G4ILO julian.g4...@gmail.com To: elecraft@mailman.qth.net Sent: Thursday, December 24, 2009 10:11 AM Subject: Re: [Elecraft] Source of mating ACC cconnector (K3) David Cutter wrote: Be nice if we could order from Elecraft, especially from outside US, along with other bits on order. Can't you get it from Maplin? I used one of these: http://www.maplin.co.uk/Module.aspx?ModuleNo=1113 . - __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] K3: LPF, bass audio, new DSP board: Stirring the pot?
What was the delivered price into UK, Geoff ? David G3UNA Regarding the new DSP board, I was not one of those who had issues with the old one or considered the K3 to be noisy on rx and I ordered the new one simply to keep my K3 #266 up to date. I use SSB almost exclusively, these days seeking dx on 80m with a headset. Having installed the new board a few days ago my subjective and non-technical assessment so far is a more pleasing sound in the headphones with increased bass response and reduced white noise without loss of sensitivity. On tx slightly fuller audio from my HC4 with more mid range. (Both rx and tx assessed with equaliser all zeros.) So on the whole I regard the new board as an improvement. Worth the money? Well that depends on how you look at it and different people may have different views. I managed to convince myself that I could afford it and I feel no sense of disappointment after the event. 73 and Happy 2010 to all Geoff G3UCK __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Tube Amplifiers
Would it be possible to write a macro to suit this? David G3UNA Hmmm. I think the software feature you want is already in the K3. Use, the CW mode, adjust the keyer to 30 WPM or so, and you have a 50% duty cycle pulser - just hold down the dot paddle. If you want a lower duty cycle, simply tweak the weight option until you get what you want. If you have a monitor scope, or a general purpose scope that covers up to 30 MHz or so, you can use it to measure the on-off ratio. - Jim, KL7CC Richard Thorpe wrote: There is a company out there that makes a little devise for tuning tube HF amplifier finals. It uses a single pulsed tone at a 30% on 70% off duty-cycle, one can see the advantage of this device in tuning up those expensive tubes. Could such an arrangement be incorporated in the software of the K3? what a handy feature to have for those of us that cannot live with just a 100 watts. Happy New Year to all. R Thorpe KD6LAZ __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] DIY DSP Rev D
Dave I would gladly fit this daughter board and perhaps do the LF enhancement, but several on this list seem to be saying that the exchange DSP board does something more than these mods provide. Can anyone clarify? David G3UNA Take a look at the K3 mods section, guys. The DSP board add-on AF LPF piggyback board is now available as K3DSPLPF, K3 DSP LPF Board $24.95 Just two tracks to cut and six through-board connections to be made. No problem at all for anyone who can figure out which end of a soldering iron is the hot end HI! 73 DaveL G3TJP __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] RX Test (long)
If the K3 is being used by a contest group or dxpedition, for instance, you will have a wider range of hearing sensitivities and these activities force us to concentrate a lot more and use a radio for long periods. On this basis, fatigue due to these artefacts should be eliminated for the benefit of the group, particularly those listening to weak signals. I think the extra filter would be a good investment. David G3UNA Joe Subich, W4TV-4 wrote: Here is the genesis of the complaint that the K3 is more fatiguing than other receivers. The out of band noise (noise above 5 KHz) in the K3 is, as you say, at least 60 dB below the peak audio level (actually, I measure it at more than 90dB down above 5 KHz). However, the stopband also has many leakage products (DAC artifacts) in the stopband some of which are as much as 50 dB ABOVE the noise floor. While these products are well below the desired audio in the passband, they are in the clear as far a local noise. This requires the ear/brain system to subconsciously work to reject (filter) the undesired discrete frequency products. But these artifacts, at least in my observation, are only present when a signal is present. If they are there when only noise is being received, they are below the extremely low out of band noise level. Therefore, whilst I can see that they could contribute to unpleasant or tiring sounding audio for those blessed with acute hearing, I can't see that they would result in the receiver sounding noisy. - Julian, G4ILO. K2 #392 K3 #222. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] K3 ADAT ADT-200A by HB9CBU
John Can't help you with numbers, just the experience of friends in that situation, ie they can operate with special receivers having special mixers, often home brew, whereas it is impossible without. David G3UNA David Cutter wrote: Some folk suffer extremely strong QRM from broadcasters on 40m (particularly on the east coast of Scotland) and to them there is a real desire for the best possible gear to hear weak stations amongst huge bc signals from Europe. That's where receivers like the Perseus and others come in to their own. Hi David, Yes I can see your point, and I am certainly not questioning the benefit of High Dynamic range receivers in those situations. I guess what I am having a hard time understanding how it would be possible for any receiver, regardless of the dynamic range of the receiver, to receive a weak signal 2 Khz away from, say a 80db over 9 broadcast or other signal. Would not the IMD, sidebands, and splatter from the broadcast station itself be so severe as to prevent this? Or am I overstating the effects of transmitted phase noise and IMD? As I mentioned in my previous post, there is no way I could see operating 2 Khz away from the very strong signal of my ham neighbor. His transmitted IMD would be way too severe. But I can easily operate 20 Khz or more away with the K3. To me, any minor difference in close in dynamic range between say the Perseus and the K3 is of little or no importance in this situation. I could not receive a weak signal so close to such a strong signal anyhow because of his transmitted IMD. But the wider spaced number's matter a great deal, and that is what concerns me when I see a 117-123db BDR as compared to 140db at wider spacings. 73, John, KD8K ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K3 and CQWW
Hi Bill Here's my two penn'orth: Operating in dxpeditions I usually use around 28 to 32wpm, down to 20wpm depending on conditions, eg 160m. In ideal conditions I would get up to around 190 contacts per hour and my friend SWH would get around 260 at similar speeds. The bottom line is that 3 or 4 per minute was considered necessary to justify all the expense of getting there. What limited me was my inability to mentally sort the hailstorm of incoming cw signals which forced my rate down to 160 or less on occasion. A K3 will help me next time. BTW on ssb my co-operator got up to 340 contacts in an hour I remember at 3am when we were on together. 73 David G3UNA Dave, here's something to ponder. 4L0A currently has the World high-claimed score for the Multioperator-Single Transmitter category. They made ~7300 QSOs in 48 hours with ONE transmitter. That means they made 7300/48 = 152 QSOs every hour on average. That's ~2.5 per minute or roughly one complete QSO every 24 seconds over the entire 48 hour period. Perhaps now you see their obsession with saving time by minimizing the exchange and sending it at high speeds! 73, Bill ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K3 and IC- 2KL; negative voltage modification
When I get around to joining mine together, I will not use ALC. David G3UNA Guys, Does anybody here use the K3 with the IC-2kl amp? Is the negative ALC modifcation really necessary? 73, Chris-OE5CSP -- ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] [K3] Poor man's beverage and diversity
Sounds like this one: http://users.erols.com/k3mt/graswire/graswire.htm A few minutes before the start of the ARRL 160m contest I decided to try something I'd heard about. I took about 180 feet (55m) of wire and laid it on the ground from my shack, across the backyard, around the back of my garage and all the way down the edge of the driveway. It turned out to be an excellent 160m receiving antenna! I expected that signals would be very weak, but they were almost as strong as on the transmitting antenna. My antenna analyzer showed an SWR of about 2.5:1. And, most important, the s/n ratio was much, much better. I connected it to the AUX input of the sub-receiver and activated diversity mode with a (very) long hold of the SUB button. I went to the CONFIG menu and set for SUB AF = BALANCE so that the sub's AF gain control would act as a balance control between the two receivers. This works great! I can hear signals get stronger in one ear when they QSB in the other. And for signals which come in better on one antenna than the other, I just turn the balance control. Even if you don't have a subreceiver, you should try the poor man's beverage (no, I don't mean wine in cardboard boxes) receiving antenna. Although the directivity is sort of arbitrary, the noise is way down compared to a vertical. The contest will still be going tonight. Try it, there is no antenna that is easier to install! -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] RF feedback
The way I explain it is to say If your roof leaks only when it rains, do you blame the rain or the roof? David G3UNA A PR problem exists here. It is difficult to get a consumer to understand why his brand new (whatever) is malfunctioning. The problem happens only when you transmit, so it must be a defect in your station. The PR problem lies in convincing the poor neighbor that while you are the cause of the problem, it is not your fault. ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] [K3] Poor man's beverage and diversity
So, if you made it 19% longer with some zig-zags, it would be resonant in the middle of the cw band and no need for matching, just connect to coax. I imagine it's fairly broad band being so close to the earth. David G3UNA David Cutter wrote: Sounds like this one: http://users.erols.com/k3mt/graswire/graswire.htm [referring to my original post] A few minutes before the start of the ARRL 160m contest I decided to try something I'd heard about. I took about 180 feet (55m) of wire and laid it on the ground from my shack, across the backyard, around the back of my garage and all the way down the edge of the driveway. My 180' wire was resonant at about 2.2 mHz, where the SWR was around 1.4:1. Since signals not down all that much compared to the vertical, I am sure that it would have worked as a transmitting antenna, and possibly without a tuner if I had lengthened it a bit. The interesting part is that it doesn't need to be straight to work. This could be very useful in a real emergency. -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] HPS-1a Gamma Hybrid,Communications Power Supply
Paul I'm always a little wary of this scheme since using it myself a while ago and not getting the results I expected. I would call it a limiter not a crowbar. I'm guessing these supplies have a relatively high (compared to conventional linear regulator) output resistance and when I've done this with other supplies it doesn't actually blow the fuse. I'm sure it would still protect your rig, but simply act as a peak limiter using the fuse and holder and output resistance to pull the output below the clamping level. Don't know what fuse you are using: say it's an ordinary fast blow 20A, then you will need 40A for 30s to blow it by which time the transient has long gone. The clamping voltage also depends on the current drawn and could be as high as 21.2V according to the spec. I would have to draw a load line to find out how that would perform with the supply but that would be only static conditions. David G3UNA I'm a bit leery of the over-voltage protection circuits built into these small supplies. I added a Vishay 1.5KE15A 15-volt transient suppressor, reverse-based across the DC output (Mouser P/N 625-1.5KE15A). The diode is in parallel with the DC output terminals but a series fuse is inserted just ahead of the diode. This is essentially a zener crowbar device that upon reaching 15 VDC will conduct and blow the DC fuse before any damage is done to the rig (or one hopes!) Paul, W9AC . ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Units
I think the term used for the SI is coherent, ie 1 x 1 = 1, none of your dynes, cubits, foot-pounds etc. A pity our cousins from across the water are not all on board the SI express. David G3UNA On 12/8/2008 9:49 AM, Barry Garratt wrote: Actually a radian is an angular measurement whereas a Hertz (hertz) is a frequency measurement. 1 radian = 57.2958 degrees 1 hertz = 1 cycle per second But, but, but. 1 cycle = 360 degrees = 2*pi radians, so frequency can be expressed in radians/second, although the numbers get unwieldy because frequencies which are an integral number of Hertz are not an integral number if expressed in radians/second. I'm still not used to the Siemens (pronounced Zee-mans) replacing Mho for units of conductance. -- 73 de K2ASP - Phil Kane Elecraft K2/100 s/n 5402 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Transport Case for K3?
I used a large food container from the supermarket. I jammed blocks into the front corners to keep the tuning knob away from the box lest it got a knock. Clip-on top made the whole thing very cheap, light weight and robust. Put that in regular travel bag with any padding you like, eg clothes or bubble wrap. David G3UNA I'm looking for recommendations for a small padded case for a K3, which could in turn be placed into checked luggage. I'd like something not much larger than the radio itself, with space for the radio alone. What have others found that will protect a K3 during transportation? 73, Jeff Maass K8ND ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K3 More Cool features
Here's a site that will show you K1 thro K8 and some KXs, some connection with communications :-) http://www.redphonebox.info/history.htm David G3UNA VK5ABQ shanewh at gmail.com Why the mountain Don? It's named K2 - like the Elecraft radio. ;-) http://climbing.about.com/od/mountainclimbing/a/K2FastFacts.htm Don Rasmussen wrote: http://www.zerobeat.net/mediawiki/index.php/Procat_Cool_for_Windows ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] LINE OUT output too low?
600ohms still seems to be the practice for ship and aircraft intercoms that I've come across recently. David G3UNA Yes. 600 ohms has not been part of audio practice, pro or consumer, for at least 40 years. ALL line level and mic level audio circuits, pro and consumer, are low impedance source, high impedance termination. The signal is transferred as a voltage, not as power or current. Typical output impedances are on the order of 100 ohms, input impedances are typically 10K for pro line level, 50K for consumer line level. 100 ohms is chosen primarily because it is a good value for isolation of op amps from the capacitance of the cable that it drives. This capacitance can be significant in pro installations, but rarely in consumer applications. For those who are interested, there's more on this in the tutorials on my website. http://audiosystemsgroup.com/publish 73, Jim Brown K9YC ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Manual - Config Menu updates
Firmly agree, it's so easy to be out of date and miss things. David G3UNA To that end, perhaps the Config Menu (incorporating new firmware updates) could be posted on the website for replacement of the (outdated) C.M. in the manual. but having the C.M. updates separately would be helpful. VE7XF ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Re: K3 Caution when using an external monaural speaker
Wayne I will be doing all the mods for Christmas. Hope you can give us the info really soon so I don't have to take the K3 apart again. Can you just point to the circuit and tell us what you intend ahead of the official mod instruction? 73 David G3UNA To this end, we're working on a very simple modification to the KIO3 audio daughter board. This will be the subject of a modification document soon, and is already being phased into production. 73, Wayne N6KR ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K3 SSB Contour Filter (reduce total bandwidth)
Didn't they use something like this in the space programs? David G3UNA K3 SSB Contour Filter Recently I was reminiscing about Narrow Band Voice Modulation which was developed in the late 1970s by Tom Lott VE2AGF and R.W.Harris, WB6CZX. An important part of this system relies on the fact that between the low frequency vowel sounds and the high frequency consonants is an almost void of several hundred Hertz. Lloyd Butler VK5BR developed a hardware filter but I was looking for a computer filter program to investigate and experiment with this. After hunting around on the internet, I suddenly realized that my K3 with KRX3 was all I needed. I locked the VFOs and set the filter on the main receiver to 350-750 Hz and the sub-receiver to 1400-2400 Hz. Listening to both receivers is equivalent to a a single receiver with a bandwidth of 2050 Hz and a notch from 750 Hz to 1400 Hz. This gives a total bandwidth of 1400 Hz with acceptable audio quality. On some SSB signals it is possible to reduce the total bandwidth down to 900 Hz. Reduced bandwidth means better S/N ratio. I had one signal (USB) with QRM from 1 kHz below. Almost no copy with normal tight filter but 100% copy with 700 Hz to 1500 Hz notched out. So, it looks promising but needs some more testing. Setting filters on CW is relatively simple. On SSB there are so many variables as you have to consider the transmitted signal, QRM and also the preferences of the receive operator. It is almost essential to have preset settings that can be recalled to suit the transmitted voice characteristics and various levels of noise and QRM. I am not an audio engineer or a programmer but it should be possible to develop a firmware (SSB contour) filter with a wide adjustable notch. I think it would be a worthwhile addition to the K3. Give the receiver/sub-receiver method a try and see if it helps you combat noise and QRM while contesting and chasing DX. If you like it, we will have to talk nicely to Lyle! 73 Tony Fegan VE3QF K3 #137 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K3: Using 40m Loop for 10m
Hi Phil I think the first thing that occurs to me is: are you feeding this loop with one coax and just switching between bands? David G3UNA I use my K3 to participate in a daily 10m CW net (28.130, 7pm PST). I've been experimenting with two antennas for the net: 40m full wave, vertically-oriented loop, relying on my KAT3 for a match, and a home-brew 10m rotatable dipole cut pretty close to resonate at 28.130. When using the loop for operating on 40m, of course I get great matching without the KAT3. When using the loop for the 10m net, the KAT3 works hard, but it does provide close to a 1:1 indicated match. When using the loop on 40m, I can vary the output from minimum to full (approx 120w). But when I use the 40m loop on 10m, the power out shows 50w max. If I maintain the power output control to indicate 100w, I get Hi Cur indications during a transmission that exceeds a minute or so. (These Hi Cur indications are never instantaneous in these situations, nor are they consistent.) I'm sure there is some form of safety protection for the K3 transmitter, but I could not find documentation on how the transmitter might behave when it's connected to such a mismatched antenna, even with the presumed match using the KAT3. Can someone educate me on this? I know my 40m loop is not supposed to do well on 10m. I was frankly surprised that the KAT3 matched it as good as it did! Believe it or not, my ground wave signal for our local 10m CW net has been reported by the net control station as much better with the loop than it is with the 10m rotatable dipole. (Using the 10m dipole, I can see power out of 100+ watts, and don't get the Hi Cur warnings -- the signal just isn't reported by most as being strong like the loop.) Any insight on this would be greatly appreciated. 73, Phil, WA7URV K3 #1206 -- ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Sequencer keying with K3/XV-144 without rigblaster?
When you changed from ac to dc did you add an anti-stiction part to the magnetic junction? If not, that's why it takes so long to separate. It' just a copper or brass shim to keep the parts at a slight distance. David G3UNA - Original Message - From: ANDY COOK To: elecraft@mailman.qth.net Sent: Friday, January 16, 2009 4:28 PM Subject: Re: [Elecraft] Sequencer keying with K3/XV-144 without rigblaster? To make this all simpler I normally run the transverter as the LAST box to be sent to transmit (ensuring that RF switching is disabled!). So Rig-sequencer-Tx relay-PA bias-transverter. This may hot switch the transverter, but that's rarely a problem in reality with the low powers and enables the system to be built with all the normal VOX / Semi-break in facilities on the radio working normally. Now just need to find out why some of the Amphenol N-type relays used for high power switching have got into a state that can take up to 0.5 second to release after volts have gone. Maybe they've got magnetised - they were originally 115V AC relays re-wound for 28V DC, but one has already bitten the dust from the consequent hot switching where the sequencer didn't figure on needing to take 1 second to changeover! 73, Andy, G4PIQ --- Brian Alsop wrote : I guess I'm missing the boat on this discussion. I thought all high power VHF ops used an external sequencer board that did the following type of thing. RX to xmit: 1) Bypass the mast mounted preamp, wait a bit 2) Put the amp in the tx mode, wait a bit 3) Put the xvtr in the tx mode, wait a bit 4) inhibit the RF output from the rig until 1-3 are complete. With a relay based system 1-3 could easily be 60ms or more. Going to receive does a similar thing --i.e. unkeying the various components with delays.. You're not going to get his set of multiple delays from the K3. There are external sequencer boards available as kits for about $20. The K3 has an inhibit line for such use. And yes, the big guns do have difficulty in the bang-bang contest mode. You call them once and occasionally get the comment, I'm not getting your call, my sequencing hasn't completed. 73 de Brian/K3KO -- ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K3/100 and the PSU
Gary You could wire the power cable direct to the pcb inside the K3, that would further reduce your losses and avoid connector damage/intermittence if it's being wiggled a lot. David G3UNA - Original Message - From: Gary Smith g...@doctorgary.net To: Elecraft@mailman.qth.net Sent: Tuesday, January 27, 2009 4:14 PM Subject: Re: [Elecraft] K3/100 and the PSU I used the included power cable and did notice a drop in the voltage of about a volt. I had bought a 35 amp, 25 amp continuous Astron power supply which has variable voltage but does not include a remote probe as the one I made from the ARRL handbook offered. The probe was used to ID voltage drop and the PS responded by upping the voltage as needed so 13.8 would be at the rig at all times. Using that probe with my old TR7 kept the voltage dead on at the rig. I was saddened to have left that in Indiana as a gift to a friend for the PS components were made from an old Wang computer I canabalized in the 80's and I designed it for an easy 80 amps and it weighed over 100 pounds and was on casters. It was too much to move and is in use today by my friend but I digress; I felt the best option with the K3 and the Astron VS35M was to use a different power cable so I cut the cable aproximately 5 from the Power Pole and soldered that short end to an 8 gauge cable made of very fine wire which I bought from Home Depot. This was part of heavy cable at about $5/foot with four conductors and a heavy neoprene outer jacket. I stripped the jacket, used two of the connectors and attached a 4' length to the Astron k3. From the K3 internal volt meter it reads: 14.0V at idle: At 25W the drop is .2 = 13.8 At 50W the drop is .3 = 13.7 At 75W the drop is .3 = 13.7 At 100W the drop is .4 = 13.6 at 120W the drop is .4 = 13.6 Not as regulated at the rig as my old homebrew PS but certainly a very little voltage drop. When running the amp I never use more than 50W drive so I'm content. One caveat is I felt the need to devise a mount to keep the power cord from moving around behind the radio. I know the PowerPoles are loved by many but I see these smaller variety as a weak point and don't much like them attached to the rig. The old TenTec attachments were not as sexy as these PowerPoles but I felt they had more heft and I didn't feel concern that someday the internal soldering would come loose from repeated motion as the rig is located from one site to another. Perhaps if the next larger size of PowerPole were utilized I would feel it more sturdy? 73, GAry KA1J ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K3/100 input voltage and TX IMD
Jan Perhaps you could share with us all the ideas and adjustments you made. David G3UNA Rick, and others Received some good ideas from some nice people here on the reflector. That together with some studies of my own led to bias adjustment on the KPA100 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K3/100 input voltage and TX IMD
Have you measured the transient response time? Should be easy to see a 1V transient with a modest scope. David G3UNA It would be interesting to check the voltage drop from the APP on the K3 to the cathode of D11 ( component of KPA3) when under a 100 watt load. 73 Gil K8EAG Cascading APP connectors can add up to relevant IR loss. For example, in my installation, the power supply and a 55-AH gel-cell battery (back-up) are routed to West Mountain PowerGate. The PowerGate feeds an 8-port APP manifold. One manifold port feeds the K3. That's 5 (count 'em) APP connector sets in the power supply path. At ~ 20A, the voltage drop at the K3 is nearly one volt when using #10 AWG wire -- and the reason why I am now using an industrial-grade power supply with remote sensing terminals that makes up for the IR loss on demand. The other devices on the manifold can easily withstand the variation. Paul, W9AC ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K3 FW request: enhanced TX TEST warning
Joe It's not just incompetence, we, well me/I, need a little help when bleary-eyed from lack of sleep, say in contest when things go wrong ; as they do... David G3UNA - Original Message - From: Joe Subich, W4TV li...@subich.com To: 'Ian White GM3SEK' gm3...@ifwtech.co.uk; elecraft@mailman.qth.net Sent: Friday, February 06, 2009 8:02 PM Subject: Re: [Elecraft] K3 FW request: enhanced TX TEST warning As a stronger warning that the K3 is in TX Test mode, would it be possible to flash the orange Delta-F LED as well as the tiny TX icon? Instead of doing that, why not simply hijack the VFO B display and flash TX TEST when in test mode? The display is already there if you think users are so incompetent that they need hand holding. 73, ... Joe, W4TV -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Ian White GM3SEK Sent: Friday, February 06, 2009 2:23 PM To: elecraft@mailman.qth.net Subject: [Elecraft] K3 FW request: enhanced TX TEST warning As a stronger warning that the K3 is in TX Test mode, would it be possible to flash the orange Delta-F LED as well as the tiny TX icon? (Think of it as an extension of what Dick already does in the K3 Utility, to signify that the rig is not available for use.) Reason for asking: Experienced user didn't notice he'd left the rig in Test mode. New user didn't notice the flashing TX icon, or that no power was going out... only that nobody was coming back to calls. Experienced user is in big trouble! -- __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] K3 external qro keying line
That's a good thought and provides instant isolation, but have some thought about the back emf off the coil - it could exceed the rating of the keying transistor. I measured 800V on a very fast scope many years ago from a reed relay. Just sticking a diode across the coil will slow it down a lot, so, some experimentation with zeners and resistors will get the situation optimised. I once used a separate keying transistor and relay and found that a small cap from the base to the collector did the job quite well by slowing the off rise time, so the transistor absorbed a bit more power but gave good control. 73 David G3UNA - Original Message - From: Don Wilhelm w3...@embarqmail.com To: elecraft@mailman.qth.net Sent: Thursday, February 12, 2009 4:00 PM Subject: Re: [Elecraft] K3 external qro keying line Terry, For those who prefer not to touch the K3 with a soldering iron, an external 12 volt relay is a good solution. Obtain the power from the K3 12VDC OUT jack and use KEYOUT to key the relay. It accomplishes the same thing and retains the ability to use QSK in the future without 'undoing' the internal relay. 73, Don W3FPR w...@comcast.net wrote: I've seen numerous posts about the PTT output line on the K3 and using older amps. Yaesu's, Kenwood's, Icom's all share the same issue. Unless you are running QSK and need instant keying, I would suggest adding a small 12v relay inside the K3 that the solid state device keys and presents the user with a set of dry, isolated contacts that can handle positive, negative and up to 250v DC or AC. I have added this to several K3's to protect the switching transistor from eventual destruction. Once again, if you are using QSK, solid state due to it's fast switching time is your only option. Yes, it means touching your K3 with a hot soldering iron, but it's a pay me now or pay me later thing, sooner or later it will blow the switch if you are hooking up older or HB amps that use other than low current positive keying voltages. Terry __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] K3 external qro keying line
Agreed. It's good to bring out these things so we are aware of ALL the ramifications of doing things, you never know who's monitoring this channel. There are some fast, small, non-vacuum relays that can be speeded up with a little circuitry. 73 David G3UNA - Original Message - From: Don Wilhelm w3...@embarqmail.com To: David Cutter d.cut...@ntlworld.com Cc: elecraft@mailman.qth.net Sent: Sunday, February 15, 2009 1:37 PM Subject: Re: [Elecraft] K3 external qro keying line David, The back emf pulse from a relay occurs when the coil circuit is opened, and its polarity is opposite that used to operate the relay. A properly connected diode should 'swallow' the back emf, and a capacitor in parallel with the coil should reduce the amplitude of the pulse. Any delay introduced by the diode and capacitor will be on the trailing edge and will not normally introduce significant delay on the leading edge. Anyone adopting this scheme would not be operating QSK, so any additional delays introduced will not be significant. Those desiring QSK operation should consider fast relays (vacuum relays) or solid state switching devices for their amplifier switching. 73, Don W3FPR David Cutter wrote: That's a good thought and provides instant isolation, but have some thought about the back emf off the coil - it could exceed the rating of the keying transistor. I measured 800V on a very fast scope many years ago from a reed relay. Just sticking a diode across the coil will slow it down a lot, so, some experimentation with zeners and resistors will get the situation optimised. I once used a separate keying transistor and relay and found that a small cap from the base to the collector did the job quite well by slowing the off rise time, so the transistor absorbed a bit more power but gave good control. 73 David G3UNA - Original Message - From: Don Wilhelm w3...@embarqmail.com To: elecraft@mailman.qth.net Sent: Thursday, February 12, 2009 4:00 PM Subject: Re: [Elecraft] K3 external qro keying line Terry, For those who prefer not to touch the K3 with a soldering iron, an external 12 volt relay is a good solution. Obtain the power from the K3 12VDC OUT jack and use KEYOUT to key the relay. It accomplishes the same thing and retains the ability to use QSK in the future without 'undoing' the internal relay. 73, Don W3FPR w...@comcast.net wrote: I've seen numerous posts about the PTT output line on the K3 and using older amps. Yaesu's, Kenwood's, Icom's all share the same issue. Unless you are running QSK and need instant keying, I would suggest adding a small 12v relay inside the K3 that the solid state device keys and presents the user with a set of dry, isolated contacts that can handle positive, negative and up to 250v DC or AC. I have added this to several K3's to protect the switching transistor from eventual destruction. Once again, if you are using QSK, solid state due to it's fast switching time is your only option. Yes, it means touching your K3 with a hot soldering iron, but it's a pay me now or pay me later thing, sooner or later it will blow the switch if you are hooking up older or HB amps that use other than low current positive keying voltages. Terry __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.0.237 / Virus Database: 270.10.23/1953 - Release Date: 02/14/09 18:01:00 __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] hot glue K2 toroids?
Dow Corning make a range, 3140 is one I've used. It's very expensive compared to the acetic acid bathroom sealant variety. David G3UNA - Original Message - From: SidShusterman k...@comcast.net To: elecraft@mailman.qth.net Sent: Monday, March 02, 2009 10:21 PM Subject: Re: [Elecraft] hot glue K2 toroids? I was asked to make this information to the group. Sid Sid, There is a variant of RTV that is OK on circuit boards. It is made by MG Chemicals specifically for electronics. It is catalog number 1035, and comes in 85ml tubes. We buy it from Allied (www.alliedelec.com), stock number 661-0780. A datasheet is available at http://www.mgchemicals.com/products/1035.html. It is non-corrosive and works very well to seal toroids to a PC board. Please let others know. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] NorCal Doublet
To avoid the joint in the middle, I've used the all-copper ladderline, ie not the copper coated steel variety, it's a lot smaller and lighter, I think it is supposed to be 450ohm (correct me if I'm wrong) it's about 10mm wide, light grey. I like the fishing swivel idea attached to the ring in the end of a fishing pole. Not sure now lossy the ribbon cable is on HF, probably similar to zip cord which goes way back. See nice article on the above in March QST. KR8L shows comparison loss compared to lightweight coax feeders and there's not much in it. David G3UNA Frank, I do not know of a source, but contrary to other posts, the Norcal doublet used actual computer #26 IDS wire (not rotator wire). Don't get me wrong, the rotator wire will work, but it will not be as lightweight as one constructed of computer flat cable as the NorCal doublet was. If you want an antenna that will perform just like the NorCal doublet, use any kind of wire for the radiator, cut to 22 ft. on each side and feed it with 300 ohm ladder line. I use the #22 teflon wire offered frequently by N2GO on the QRP reflector for the radiating element, and use either lengths of the same N2GO wire twisted for the feedline or I use the 300 ohm ladder line. The teflon insulation is nice because it does not stick to tree limbs and if tangled is easy to untangle because of the 'slippery' nature of teflon. The antenna is the same as the NorCal doublet, but the wire is different. 73, Don W3FPR Frank MacDonell wrote: Does anyone know where one can purchase the wire for the NorCal Doublet Antenna (4 strand computer ribbon wire)? Thanks __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Repeat Postings
This happens to me quite often. I've found it is my ISP and it's not just Elecraft postings. I have to delete the postings via webmail otherwise they keep downloading scores of copies. David G3UNA - Original Message - From: Roy Morris w4...@carolina.rr.com To: elecraft@mailman.qth.net Sent: Friday, March 13, 2009 3:09 PM Subject: [Elecraft] Repeat Postings I am also getting repeat postings. I hope this can be eliminated. Roy Morris W4WFB __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Cecil Moore's no-tuner ANT
Hello Frank May I ask what relays you use? I imagine there are some high voltages under some conditions. Do you run high power? Thanks David G3UNA - Original Message - From: Frank R. Oppedijk f.opped...@avista.nl To: Elecraft_List elecraft@mailman.qth.net Sent: Thursday, March 19, 2009 5:12 AM Subject: Re: [Elecraft] Cecil Moore's no-tuner ANT Hi Duane, I do happen to use Cecil Moore's ladder network and switch it from inside the shack. I didn't program a PIC but used a third-party BCD-to-band decoder to decode the K3 band data that's available on the AUX connector, followed by some diode logic driving the 1' to 16' relays outside. Works like a charm! I use this ladder network for a couple of months now. Just bagged my first VK on 80m Tuesday night, on my low (10m high) 2x24m doublet at first try, so I'm not complaining. If there's serious interest in it, I can draw up some info on what I did and make it available publicly. 73, Frank PA4N At 00:41 18/03/2009, dw wrote: Hey Paul If one were to put a programmed PIC and some latching-relays together, one could switch that ladder network from inside the shack! :^] Wouldn't that be cool!! Duane __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] K3 - Stand Alone Panadaptor
Jack's Z90 did it but he no longer makes them. http://www.cliftonlaboratories.com/Z90.htm#Z90 David G3UNA - Original Message - From: Joe Word joe.n...@gmail.com To: elecraft@mailman.qth.net Sent: Friday, March 20, 2009 11:06 PM Subject: [Elecraft] K3 - Stand Alone Panadaptor Has anyone developed a stand alone Panadaptor without the need for a computer? Is Elecraft considering this? The stand alone unit would be something like Yaesu's DMU unit. Joe N9VX __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] K3 - Revolutionary Noise Reduction
I know this Professor, he has an assistant George Izard O'Veering David G3UNA __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] totally OT, except to the extent that it's QRP: LED lamps
Perhaps the time is now right to replace domestic lighting circuits with 12V supply, then the cost of the fitments will come down, ie no need for 110/240V conversion to low dc for the leds. Safer, cheaper, more reliable, less raw materials. At those power levels, you could probably keep the original house wiring and just fit a 12V transformer/rectifier. Easier to use alternative power sources, too. Be nice if we had your prices over here. David G3UNA - Original Message - From: wayne burdick n...@elecraft.com To: Elecraft Reflector elecraft@mailman.qth.net Sent: Friday, April 03, 2009 9:59 PM Subject: [Elecraft] totally OT, except to the extent that it's QRP: LED lamps I just replaced four gas-guzzling incandescent lamps in my dining room chandelier with four LED lamps that screw into the same bases. Went from 240 watts to 6 watts, total. The usual complaint about LED lamps is the cost. But prices are coming down fast: these were only about $4 each at Costco. Each contains 21 white LEDs, and they basically last forever, which means I won't constantly be replacing lamps in this fixture. If the world converts to LED lighting, we won't need to build any more power plants, and we can all use KW amps guilt-free :) Wayne N6KR __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Inductive Kick
The usual diode across the coil is simple and effective for the vast majority of situations but the rate of change of current can induce undesirable effects in nearby sensitive circuits which the diode exacerbates. For most relays we see in ham rigs a 1N400x series diode is often used, when a 1N4148 is not big enough to dissipate the energy pulse of bigger relays. I have wondered if the slow 1N4000 types can turn on fast enough to catch those first few ns, but I have not looked into this. I have used a capacitor between base and collector of the driver to slow down the rate of change and thus eliminate both the overshoot problem and coupling energy into nearby sensitive circuits. Some speed-up circuits which apply a series resistor also help with this potential problem. David G3UNA - Original Message - From: David Robertson dar...@comcast.net To: w3...@embarqmail.com Cc: Elecraft elecraft@mailman.qth.net Sent: Sunday, April 05, 2009 1:11 PM Subject: [Elecraft] Inductive Kick Carl, I completely agree with you. I have seen 12 volt DC relays produce as much as 1000 volts peak or more when the current to the relay coil was terminated. This term was taught to me as Inductive Kick. When any coil of wire has DC current pass through it, a magnetic field is produced and magnetic flux builds up around the coil. This would be like stretching a spring. If you disconnect the current source, the magnetic field can quickly collapse causing the lines of magnetic flux to quickly cut accrossed the windings of the coil resulting in a high voltage spike. This would be equivalent to letting go of your stretched spring which can snap back at high speed resulting in possible damage. Placing a diode in parallel with the coil with the cathode toward the positive side of the current source has no effect when current is normally applied. When you interrupt the current. the magnetic field collapses causing the coil to become a current source. The diode carries the current and reduces the voltage because of it's low impedance when switched on. Remember the stretched spring. Having the diode in the circuit is like slowly releasing your spring instead of it snapping back. Hope this helps. 73 Dave KD1NA Don, seriously disagree about the magnitude of the kick. For years I taught a course on industrial installations and demo'ed the kick issue by soldering two bare wire to the coil of a small Potter and Brumfield ice cube 12 vdc relay. I would pick the biggest guy in the class to hold the wires while I touched them to a nine-volt transistor radio battery. And then watch as he would throw the relay across the room. A reverse diode would vastly reduce the effect. Well, I got yelled at and was told Hey, Stupid (and stupid wasn't the word they used)! Put that on a storage scope to see what you're messing with. The scope showed a spike of 450 vdc! The diode reduced it to less than 75 vdc. The magnitude is due mainly to the large inductance of the coil, but until some measurements are taken, some caution is advised. The inductance of any coil inside a K2 or K3 is bound to be much smaller. But the phenomenon is the same. 73, Carl WC0V __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
