Re: [Elecraft] Elecraft Digest, Vol 187, Issue 8
The only reason for making "ground" negative was to prevent ionic transfer of the copper. Cortland, KA5S Five years in R at DSC/Alcatel USA in Petaluma On 11/5/2019 18:56 PM, elecraft-requ...@mailman.qth.net wrote: On Nov 5, 2019, at 12:19 PM, Phil Kane wrote: ?On 11/4/2019 1:24 PM, Rick Bates (WA6NHC) wrote: Perhaps since that is the standard voltage for cars, trucks, RVs and other vehicles. Commercial communication base-station equipment has been standardized at -48 volts(*) for quite a while and actually needs to use a voltage converter for the odd-ball +12 V or 120V AC equipment that has to be run. (*) -48 volts has been the telephone industry standard since Ma Bell was a teen-ager! __ 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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] [OT] NEC wire size requirements
On 8/11/2016 14:10, Walter Underwood wrote: In the late 1980?s, we had some cubicle wiring fires at HP Labs caused by computer power supplies. They had to replace That's the famous power-factor- harmonics-in-the-neutral problem. Got some attention, that did; electrical fire in a high-rise will do that. Cortland Richmond __ 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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] Common mode chokes
I had a similar problem in 2005 when noise from a 2kW Honda got into my RV on FD. Lacking any ferrites etc I borrowed a plastic "milk bottle box" and wound about 30 feet of extension cord around it., which worked well as a temporary fix. Cortland ka5s On 8/7/2016 2:21 PM, elecraft-requ...@mailman.qth.net wrote: I have an inverter generator producing S9 noise on 3.5Mhz, and S7 noise on 7Mhz. Higher frequencies are clear. If I were to use a trifilar wound choke on the lead from the generator, what would be the best mix...43, 77 or? __ 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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] 10 MHz external reference - GPSDO
On 3/13/2016 9:08 AM, Don Wilhelm wrote: I think everyone is ignoring something here. What causes the frequency drift in the first place? It is temperature changes - the designation TCXO signifies 50% OT but... I'm not complaining about stability, mind; the KX3 temperature compensation routine works really well, but if I use a GPSDO-clocked synthesizer to generate my KX3's clock, will that stabilize the on-board synthesizer? I have a PTS-160. Cortland Richmond KA5S __ 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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] Point me to the note for sending CW when in, SSB mode
On 6/14/2013 0240, elecraft-requ...@mailman.qth.net wrote: Date: Thu, 13 Jun 2013 16:24:12 -0400 From: Joe Subich, W4TV li...@subich.com The rig can not tell if you want to transmit SSB or CW if you assert PTT before the key closes and because of settling time for the various oscillators/synthesizers/offsets can't change from SSB to CW while in transmit. If one were to change from SSB to CW with every key closure (which is what would happen if one permitted CW with PTT in SSB, the CW would be very whoopy. 73, ... Joe, W4TV Just turn on the sidetone generator on key closure in SSB. Is it pure enough? Cortland KA5S __ 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] KX3 invoice received; salivating like Pavlov's dog. Audio tapoff/in inside?
Just got the invoice for my Dayton order, shipping this week. It came JUST as I spent $400 on an old radio from Tennessee, too. And a private road getting paved. I DON'T MIND. Noting the talk about how to operate RTTY with the KX-3; is there a place inside I could just tap into post mic-gain and pre-AF volume for a SC? Gotta eat some sardines, *so I can wait with baited breath*. Cortland KA5S __ 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] Balun at input or output of tuner
I hesitate to step between Dean and anyone else but... it seems to me that a Balun with good enough common mode choking should fulfill all the isolation requirements we might have. The isolation any Balun provides takes place at the point it is inserted, so a Balun built for 50 Ohms may be used at the input to a (floating) tuner without our necessarily being worse off than putting it on a tuner output -- if we can tolerate what imbalance exists on the load side on the load and resulting RF on the tuner chassis. We must make that RF low enough to live with, for which we don't need perfect isolation, only _enough_. It may go without saying that we can put CM chokes anywhere we want -- and as may times as we want (losses permitting). This may be moot; in his article/A Better Antenna-Tuner Balun/, QEX, Sept/Oct 2005, ZS1AN noted the problem with voltage Baluns and inherently unbalanced loads, and proposed a combined voltage and current balun to gain the advantages of both. excerpt: /...analyze the performance of the 1:1 current balun and the 4:1 voltage balun in this application. The analysis shows that the current balun operates effectively only for small load impedances, while the voltage balun is effective only if the load impedance is well balanced with respect to ground. I then introduce a new design: the hybrid balun, which overcomes these limitations of the voltage and current baluns. It can operate with much higher load impedances than can current baluns and with unbalanced load impedances that voltage baluns could not drive effectively. / Cortland KA5S On 12/14/2011 7:56 PM, Don Wilhelm wrote: Dean, The last two paragraphs of your writeup do not seem relevant to the discussion of balun (CM choke) at the input or output Those paragraphs deal with operating coax at a very high 60:1 SWR, and neither support nor agree with the other points. Consider the following: A situation where the windowsill connection is 20 feet away from the tuner output. The balun has the same loss no matter where it is placed, so lets assume it is placed at the output. Now, consider that the connection between the tuner output and the windowsill is with 20 feet of RG-213. The balanced line is connected directly to the coax (no balun). By the analysis presented, the loss will be exactly the same as with the balun connected at the windowsill end of the coax. Both conditions are electrically the same (If that point is arguable, then the balun at the tuner input is just as arguable). If we can extend this argument, we would be able to conclude that it makes no difference on a coax fed antenna whether the balun is placed at the antenna or at the tuner output - no matter whether the feedline is coax or balanced line. Oh, yes, both the coax or balanced line must be isolated and run with the same rules normally applied to balanced line. The point is that while theory says it makes no difference, it is impossible to achieve that perfect isolation, so the argument falls apart. __ 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] KAT500 update
You are assuming that the choking impedance is what the transmission line used for a winding sees; THAT is always whatever impedance the SWR presents. The 2500 Ohm choking impedance is only seen by current on the outside of the cable, a good deal less power (thus voltage) than what is inside. It need only be insulated enough to prevent arcing from output to adjacent turns. Cheers! Cortland KA5S On 12/8/201116:43 n09e wrote: Imagine choke constructed with RG174 looped through a toroid 10 times. Also imagine output resitstance 2500 Ohms and 100W power. On input, RG174 has a peak voltage of 100V. No problem. On output, RG174 has a peak voltage of 1000V. It would melt in seconds. What is wrong here? Assumptions? Ignacy __ 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] Multiple identical Digests
Today I counted EIGHT Elecraft Digests, all Vol 87, Issue 21. What's going on? Cortland KA5S __ 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] KPA-500 Output for Input schedule?
The INTERESTING thing about the article is that it is ANALOG predistortion. Even a few dB would be an improvement, if 10 to 20 dB proves beyond reach for such a broad (16:1) spectrum as HF. Cortland KA5S Date: Thu, 12 May 2011 13:43:51 -0400 From: Jack Smith jack.sm...@cliftonlaboratories.com Subject: Re: [Elecraft] KPA-500 Output for Input schedule? To: elecraft@mailman.qth.net Message-ID: 4dcc1c56.5050...@cliftonlaboratories.com Content-Type: text/plain; charset=ISO-8859-1; format=flowed Geoff list readers ... There's an article in the current Electronics Design News, as a matter of fact, on pre-distortion. http://www.edn.com/article/518070-RF_predistortion_straightens_out_your_sign als.php Although aimed at cellular radio digital modulation, the concepts apply to analog SSB as well. Jack On 5/12/2011 12:44 PM, Geoffrey Mackenzie-Kennedy wrote: Hello Guy, The short answer to the first part of your question is yes, and the generic term for such a scheme is Predistortion. A term that has been used to identify a Predistortion scheme which employ digital techniques is a Digital Predistortion Linearizer (DPL), and its use can bring about a significant reduction in the level of IMD being transmitted compared to a classic class AB design. Unfortunately the relevant data that I have is packed ready to leave for Luxembourg. I don't know how easy or difficult DPL would be to implement in the K3, or in any other already designed rig which employs DSP, but I suspect that somebody else reading this could tell you. 73, Geoff GM4ESD __ 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] Phase noise vs. FD (was: FTDX5000 Design Flaw)
Hi, Gene! OFF TOPIC of course but IIRC, I brought my 751 to the Billerica ARC FD with no complaints, but might have had a 751A by then. ON topic (sort of) WRT my K2, no one here says anything about phase noise at the Grand Rapids FD. One OT wants to sell his linear so he can buy a K2 . So far my FD rigs *here* have been a TT Corsair II, a TT Paragon, and a K2. The CW ops all like the K2 best. Adding a KAF2 today. Cheers, Cortland KA5S [Original Message] Date: Sat, 20 Nov 2010 17:26:26 -0500 From: Eugene Balinski euge...@nni.com Subject: Re: [Elecraft] FTDX5000 Design Flaw To: John, KI6WX ki...@pacbell.net,elecraft@mailman.qth.net Message-ID: web-335489...@admin.nni.com Content-Type: text/plain; charset=ISO-8859-1 The phase noise on the original Icom IC-751 (not the A versions) was so bad that it was banned from our multi-transmitter field day site. Seems it took out a number of bands when transmitting-. Gene K1NR __ 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 K2/100 lives!!!
I brought the CW rig for W8DC for FD, and found a KPA100 on eBay for what I considered a reasonable price, assembled, With a few parts from Elecraft (thanks, folks!) I managed to get it operational in time for FD -- and ONE result is that our chief CW op is now talking about selling a linear and buying a K2. The CW filters were perfect for working through the QRN as storms moved into Western Michigan. Even if we did have to pack up early Sunday. It is a FUN radio. Cortland KA5S [Original Message] From: kc4wvl kc4...@peoplepc.com Subject: [Elecraft] Elecraft K2/100 lives!!! To: elecraft@mailman.qth.net After more than 6 years off and on (more off, than on), Elecraft K2/100 s/n 4276 lives!!! The final test was FD 2010 operating from the Uncle Bill's Radio Club for Kids (UBRCK) field day site, under callsign NJ1E. The rig successfully logged more than 35+ contacts under the hand of several kids who were being exposed to Ham Radio for the first time. Needless to say, we weren't going for score. Just to have fun. Slade Smith KC4WVL __ 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] OK... what am I missing now?
I HAVE protection. Probably from stuff I don't need to be protected from: 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: A known bad url was replaced by VIPRE Please help support this email list: A known bad url was replaced by VIPRE Cortland KA5 __ 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] OK... what am I missing now?
It's a notification from my Vipre firewalls/virus filter/web protector. Didn't think it would reach into email and scrub links! Cortland KA5S [Original Message] From: Don Wilhelm w3...@embarqmail.com To: k...@earthlink.net Date: 4/14/2010 9:41:34 PM Subject: Re: [Elecraft] OK... what am I missing now? Where did *that* come from? I did not see it on the Elecraft reflector. Perhaps Nabble or simething similar has some type of intrusion. 73, Don W3FPR Cortland Richmond wrote: I HAVE protection. Probably from stuff I don't need to be protected from: 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: A known bad url was replaced by VIPRE Please help support this email list: A known bad url was replaced by VIPRE Cortland KA5 __ 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: A known bad url was replaced by VIPRE Please help support this email list: A known bad url was replaced by VIPRE __ 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] Chinese copy of KX-1?
Anyone interested in copyright violations? http://forums.qrz.com/showpost.php?p=1542773postcount=1 Cortland KA5S __ 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] WRT S-meters:
I'd agree that fractional S units could be useful, a ratio of 2:1 being often unhelpful. The suggested workarounds look good; one hang an old RF voltmeter on the IF. But how elaborate do we want to get? Anyway, here's a verse, Roger Copy, I wrote and sent to my club's bulletin in 2003: Roger Copy Roger copy? QSL? You're five by nine, repeat. I missed your name and weather; my report, that would be neat. The rig's a brand new Garbletron, my beam is turned around; You've got a real good signal here, please say again your town. QSL? My audio? How do I sound to you? Is my 1500 watts still getting through? The rig's a little hot, I'll give this mike a shot, And just what does an RF clipper do? QRZ? Are you still there? I must retune the amp; I don't seem to be hearing as I should. Give me a listen to, does my voice sound deep and true? I'm trying something else that might work good. Ah, QSB. You faded out. I see the reason why: The coax melting at the tuner, there. I'll replace it with hardline and call another time, Seven threes, and see you later on the air. © Cortland Richmond 2003 Cortland KA5S Saving for the K ___ 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] 6 KHz filter and PSK31
Soundcarc modes have one large problem used this way; harmonics of low tones may produce a multiple (and unauthorized) signal in the passband. That's a good reason to use tones near the high frequency cutoff. And that's not counting transmit IMD. Cortland KA5S [Original Message] Date: Sat, 20 Sep 2008 00:40:38 -0600 From: Bob Cunnings [EMAIL PROTECTED] Subject: Re: [Elecraft] K3 PSK31 with Digipan To: elecraft@mailman.qth.net Message-ID: [EMAIL PROTECTED] Content-Type: text/plain; charset=ISO-8859-1 It finally dawned on me that the 6kHz filter could be put to work for soundcard modes in both transmit and receive by enabling ESSB and using USB or LSB instead of DATA A. Indeed, it works just fine with BW set to 4kHz and shift adjusted to put center at 1800 or so. With DM 780 set to max width (3.9 kHz) the waterfall just about fills the screen and there's almost 3.5 kHz bandwidth for transmit and receive. This gives a wider field for casual point and click PSK31 operation - nice for a simple setup like mine where there is no computer control of the radio, and I want to keep the knob twirling on the rig to a minimum (the interface consists only of 2 audio cables between laptop and rig with VOX keying. TX EQ flat, AGC and compressor disabled of course). Bob NW8L ___ 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] Re: K2 and digital modes
RTTY works even with Class C finals! Cortland KA5S -Original Message- Date: Fri, 21 Mar 2008 15:43:28 +0100 From: Simon Brown (HB9DRV) [EMAIL PROTECTED] Hi, This applies to phase shift keying modes. RTTY seems to be OK with some ALC - remember it's the peak power that matters, not the average. Simon Brown, HB9DRV ___ 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] RE: (OT: knoves) Elecraft Digest, Vol 38, Issue 9
When I went to school in England, in the early 1950's, students each had to bring a penknife, to sharpen pencils. (It also helped us make conkers.) Cortland KA5S David Ferrington, M0XDF wrote: Well, he was sending it out of the UK, the government are happy to see knives leaving the UK, just not coming it! But seriously, there are limits. A 3 inch pocket knife with a folding blade that doesn't lock would probably be ok, especially on a member of the Scout Association (I'm a Scout leader). But even then, in some places this would be unacceptable. Blades that 'flick' or 'lock' are a definite no-no. ___ 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] RE: 19inch Racks - more OT
Now we all have been taught about relay racks (19 inches). Telephone companies use 23 inch racks. In the EMC field we use a _41_ inch rod antenna to measure low-frequency electric fields. Why 41 inches? As related to me, when testing was done on the C47, that was the longest rod antenna that would fit at the radio operators position. And now it's standard. BUT! Per http://www.jedai.com/solutions/Plant_Business_Ready.pdf a telecom rack has TWO sizes: the smaller NEBS rack is 20 5/16. Great sliding standards, Batman! Where will it end? Woe! Woe! Ahem. The decibel is mighty nice; You can measure once, and then cut twice. The reason we can be so free? To one dB, pi equals... three! Cortland KA5S [Original Message] Tom, KJ3D wrote particularily gruff vice admiral who I'm pretty sure coined the phrase lead, follow or get the hell out of the way, and liked to continually stir whatever pot he happened to be in charge of at the time. For whatever reason, he called me into his office, one day, and asked me if the 19 inch rack panel was a standard or a tradition. I had long since learned not to ask him why he was curious, I just charged off to find out. I uncovered countless references to 19 racks, and a lot of things which specified it, but failed to find out anything about its genisus. Since failure was not an option, I reported that it had something to do with the width of hatches on early submarines, but an original order - if one existed - was lost in the fog of the past. In any event, the 19 inch standard was so deeply ingrained in the military (and a good bit of civilian industry as well) that it might as well have come down as the 11th commandment. He grudently accepted my findings, but continued to press the issue, claiming that if services were going to continue to support 19 racks, there needed to be a mil spec actually in place. Thankfully I retired before being thrown into that briar patch. ___ 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] RE: Elecraft RF Probe
Larry N8LP wrote [Original Message] Date: Tue, 23 May 2006 06:29:45 -0400 be 100V ( 70.7v RMS) across a 50 ohm load at 100W. A series pair of 1N5711 Schottky diodes should give you 140V PIV, which should be safe. The drop will still be quite low... lower than a single silicon diode, but obviously twice as high as a single Schottky. Slightl off topic but for a *low* level detector, an old trick uses an inverted bipolar transistr as a shunt rectifier. See http://www.edn.com/article/CA47314.html . Cortland KA5S (/8) ___ 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] RE: Re: tube amplifiers and polyproplene capacitors
Dale - WC7S - wrote: [Original Message] When I had the tv shop, I used to bring out the scope and show folks the difference, if they were so enclined. And.. I suppose you can imagine the reaction when I went shopping, of the salesforce, and the manager when I came through the door with my little Tektronics scope in hand. with a load resistor and ready to not only hear but see the difference Circuit City really doesn't like that. I use a VR-500 receiver when looking for monitors, computers and the like, to see which ones are RF-quiet. Quieter, anyway. That also gets the eye. Cortland KA5S ___ 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 output of K2
Ian, G4ICV, AB2GR wrote That 70.4 Volts peak to peak is 12.4 Watts; my Heathkit meter is reading low. But probably within its tolerance. 10 watts would be ~63.2 volts peak to peak, so you're reading less than 1 dB high. How accurate is the scope? And how much do you need that dB? (grin!) Have fun! Cortland KA5S ___ 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] Is CW a Language? OT
Mike Morrow [EMAIL PROTECTED] wrote It is unfortunate that contest and DX rules in general don't mandate complete call sign exchanges by both stations, each containing both station call signs along with the proper prosigns. That would certainly be more Since the FCC has few monitors who can copy CW any more, they are pretty unconcerned how we ID. Thus our procedures change to meet our own needs. Is someone giving away Maserati's? I'll show upand shout my name too; why else would I be in the pileup? Properly, this requires a DE before the call, but I only need one of those after ten minutes -- and what the eye (ear) don't see (hear) the heart (Engineer) won't grieve (miss). FWIW, while the FCC may have given up on CW, the *FBI* had openings for CW ops two or three years ago. Cortland KA5S ___ 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] Is CW a Language? OT
Hi Joe. Morse turned out in practice not as useful as the Tap code. See http://www.miafacts.org/pages.htm Cortland KA5S [Original Message] Message: 20 Date: Fri, 13 Jan 2006 11:14:53 -0500 From: Joseph Trombino Jr [EMAIL PROTECTED] Might I suggest that dragging a rock along the prison wall for a second or so can be used to make a DASH.as compared to the short tap of the rock against the wall for a DOT. ___ 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] RE: Stupid, stupid, stupid - OT
Ron AC7AC wrote It's mostly ignorance, though, not stupidity, and some of it pays off. Like the engineer who was developing magnetron power oscillators for radar systems in the 1940's and discovered that the chocolate bar in his nice white shirt pocket had melted and made a mess. Curious, he investigated why. The first Microwave Oven was the result - sold as the Radar Range. At least he got his revenge for the ruined shirt. I haven't gotten that sort of revenge yet. Still looking (where's my lead pencil?) I heard my late uncle (Marvin Bock) had his name on one of the Radar Range patents. Dumb things? When I knew better? Sure! Checking SWR standing on a ladder while the tail rotor whirred around not three feet from my face? Dumb. 1100V from a plate cap (still have a mark on that hand). Stupid. Marrying a woman who was half Mexican, half Apache, and half Italian spy. Priceless. Cortland KA5S ___ 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] RE: Monitor Noise
Jim - W0EB wrote I have to echo W3FPR's advice. I had a Viewsonic monitor myself, and I DID shield the inside, put ferrites on the VGA input cable, put chokes, ferrites capacitors on the AC input as well, and didn't even manage to reduce the radiated noise. I suspect it's coming from the CRT itself. You will most likely spend more money trying to fix that monitor than you would buying an And it depends what kind of noise it is. Swiching power supply, flyback, or video. The last is characterized by very strong, stable carriers whose frequency changes with display mode and whose strength changes with brigtness and contrast. This makes sense, the electron beam is turned on and off fast ( 1ns) at pixel rates. About 15 years ago, when I was working for a large electronics retailer and (at the time) computer maker, I occasion to fix a couple of such monitors just to show the manufacturer it could be done. Their problem was associated with the CRT cathode current, and the radiated field was strong enough that nearby equipment *that wasn't even turned on* exceeded the FCC conducted emissions limit. In these cases I was able to reduce emissions by adding capacitive coupling between the CRT-mounted video amplifier and the tube. This was really just a piece of thin sheet metal soldered to the teh cathode driver board's ground plane and extended it forward, providing a return path for HF current that would otherwise be radiated. I don't know if any manufacturer actually did this, mind, but it's fairly easy to do. The usual caveats apply about working on CRT's. They're high voltage devices and can deliver a dangerous shock some for time after being turned off. Cortland KA5S ___ 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] RE: CW-Pitch 600 Hz or 700 Hz or what?
On Nov 13, 2005, at 10:05 AM, Bill Coleman (AA4LR) wrote: While a lot of older rigs had an offset for 1000 Hz, most newer rigs are 700-800 Hz. But long-time CW ops typically go for even lower My old Hallicrafters FPM-300 generated CW at 1750 Hz,a thoroughly unpleasant tone, and the reason why I quickly installed an RIT circuit in my 300, which lacks one. Cortland KA5S ___ 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] RE: Mic Plug Metric
Peter, PA0PJE.wrote We're still waiting for Britain to go metric for 39 years, Bob. Thirty nine point thirty seven, Or so I am told, Then they'll bein metric heaven, Long and tall and bold. There: Poetic foot to poetic meter! Cortland KA5S ___ 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] very small antenna
Julius n2wn wrote Might I suggest something less commercial... haul a collapsible crappy fishing pole and some wire. You can make a vertical, you can make a loop, you can make an inverted vee. You have flexibility and it's a lot cheaper than commercial minature antennas (probably will work a lot better as well). Nothing has to be commercial, unless it's easier and cheaper in time and effort to go that route. Got the poles, the wire, trees, tuner... a wire over a tree ALWAYS works better than a 7 foot loaded vertical over no radials. On the other hand, I can walk around with an MP-1 and keyer paddles fastened on a radio and operate on the move. As you can see from the pictures at HFPack, some folks have really elaborate walking-about antennas, not that mine looks less silly; an antenna sprouting from one's belly _is_ a bit unusual. Cortland KA5S ___ 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] RE: very small antenna
[Original Message] ...Looking for a small (pack-away in a suit-case and going to bahamas on a cruise line for vacation antenna.) I found three on the Yahoo search that looked good. the buddiepole, the Ventura, the miracle whip each one claims to have all band and each one says has at least some gain The small portable antennas do not show gain over their full sized big brothers. For direct comparisons of portable;/packable antennas, see HFPack.com. Vertical antennas are compared at http://www.hflink.com/hfpack/antennas/shootoutvertical2002.html and horizontal antennas at http://www.hflink.com/hfpack/antennas/shootouthorizontal2002.html . Beside efficiency, of course one must be concerned about size and ruggedness. The Miracle Whip is quite small, and for some this outweigh its low efficiency. The Ventanna is helically wound with18 inch sections and is very rugged as well as doing well in the HFPack 20 meter Shootout. The Buddipole is a rugged antenna with tapped coils on rigid forms, rather than a more fragile BW Airdux (tm) style. Take a look at all the antennas on HFPack. I use a Superantenas MP-1, which in its small version can be carried inside its own loading coil/sleeve. I am informed that some travellers have been required to placed their MP-1's in checked baggage sic ethey might be used as a baton or club. (No one has yet made me do this with heavier -- much more suitable for clubbing -- laptop batteries.) Cortland KA5S ___ 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] RE: MFJ HI-Q Loop 1788 Will not stay on frequency.
Ken W0CA wrote: time. My problem is the antenna will not stay on frequency. It will tune on any frequency easily but the only time it will stay on frequency is in the middle of the night with no wind. I talked to MFJ and Tom recommended I tighten the spring on the capacitor. I did and it improved but again this week end I saw it jump and drift. I had it tuned up on 14.058 and it dropped down to 14.007. Another time it jumped from 14.058 to 14.076. I know others I have one of these (now in storage) and that spring arrangment is IMO a kludge. When I got mine, the shaft was misaligned and it didn't even work. One way to deal with its loose tuning is to always tune past the desired frequency then come back in the direction (I forget which) which results in less frequency change afterwards. That said, this antenna is very narrow, and it is neither temperature compensated nor digitally stabilized. Mechanical vibration and temperature changes WILL throw tuning off, and we should be prepared to live with it. Remember, an old Heathkit VFO would easily drift 100 Khz if we hung its coil out where the loop is. Just beep the tune switch and keep going.. Cortland KA5S ___ 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] RE: OT: Effect of Compression and Expansionon the Inductance of Toroids?
Ron AC7AC wrote: ... I'm confident that the added capacitance by squeezing the turns together is not what is causing my L-meter to show increased inductance. If anything, the capacitance would tend to cause the L-meter to show lower inductance. Inductance is a result of the magnetic field intercepted by each turn. An ideal inductor has each turn intercepting the same (entire) field. In a solenoid much longer than it is wide, however, this does not happen, and the inductance realized is lower than the ideal case, sometimes much lower. While a ferrite core concentrates the field, and a toroid insures almost all of it remains within the core, the winding is after all halfway surrounded by air and some of the field is still not shared by all turns. Compressing it reduces this effect. A Bug Catcher coil comes closer to L changing as the square of turns than a Hamstick(r)! That's my take, anyway. One way to test this would be to cover the winding with ferrite. A babushkoroid! Or try a pot core. If my surmise from High School physics is correct, the more the field is in ferrite, rather than air, the less effect compressing the turns will have. Indirectly, we might also try surrounding a toroid with a solenoid to see if coupling to that winding decreases as toroid turns are compressed, but leakage coupling will depend on the angle each part of the toroid winding has to the solenoid -- and the sum of all the fields on a completely occupied cores at a surrounding solenoid should be zero regardless of leakage, I think. Perhaps instead of a solenoid, an external toroid wider than the inductor under test might be used. But I like the babushkaroid. Remember, you saw it here first! Cortland KA5S ___ 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] XIT/Split interaction?
I suffered an emabrrassing lapse today while trying to work a DX station up. I set the A and B vfos for split operation and on transmit, the frequency display changed as it should .But it turned out the rig didn't After a while I noticed I could hear the DX station while I was (I thought) on the split side (and before it changed back). Sheesh. Joined the LID club. I had left XIT on by mistake, and it was apparently cancelling the split. Problem went away when I cancelled XIT. Later, monitoring with a second receiver showed that was indeed happening. I won't crawl away to 2 meter FM just yet (grin), but has anyone else noted this? Cortland KA5S ___ 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] Five hours to K2
When I bought the raffle ticket a month ago it was just helping out a club. I was already planning on buying a rig to replace a dying one (still got it apart). I did, too, a Yaesu FT-920 that we used at FD for CW and which is a very nice radio indeed. However... THAT radio had a 30 day warranty and is is now on its way back to Yaesu for repair. So when I got the E-mail it was good timing. Great timing, in fact. Thanks, SBARA! I don't know what mike pinout the builder wired this K2 for, but a key will work right out of the box. I think I'll try a little HF Pack operation right there at the Burger place! Anticipating... Cortland KA5S ___ 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] RE: Back to the Future - Morse Code and Cellular Phones
from [Margaret Leber] [Permanent Link][Original] Published on The O'Reilly Network (http://www.oreillynet.com/) http://www.oreillynet.com/pub/wlg/7016 Back to the Future - Morse Code and Cellular Phones by Brian McConnell Jun. 28, 2005 Tapping Morse Code, or a derivative of it, could be one way to solve this problem. With Morse Code, one could tap text messages out without looking at the telephone, and without having to fumble with ever smaller keypads. I'll admit that the idea of resurrecting Morse Code seems improbable, but then it's worth remembering ... Tapping has a long and interesting history among prisoners. It was used in the Hanoi Hilton too: quote We asked him what they were teaching in the prison compound phase of survival school, especially about communicating. Imagine our amazement and consternation when he reported that the instructors had mentioned that we had a secret code which his fellow prisoners would teach him when he arrived there. Secret? It had been public knowledge for centuries. unquote See http://www.geocities.com/talesofseasia/talktome.html The tap code (or prisoners code) has been around for a long, long time. In English, by leaving out one letter of the alphabet (the VN prisoners left out K) you could make a 5 by 5 letter matrix of the aplphabet, and send messages with sequences of taps indicating which row and column the letter occupied. The article calls it superior to IMC because IMC requires two different kinds of taps. Some of the prsoners were able to signal using teh rythmn of their sweeping, coudhing, snoring and some became so expert that guards thought the prisoner was just tapping to harass his guards. But read the article. How does it look? Well, theletters in ETAONISHRDLU are the most commonly used letters in English. In tap, that's: E . . (pause) T (pause) A . . (pause) O ... (pause) N ... ... (pause) I .. (pause) S ... (pause) H .. ... (pause) R .. (pause) D . (pause) L ... . (pause) U . We now return you to your regualrly scheduled priogram. Cortland KA5S ___ 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] lithium AA's etc.
Tim O'Rourke wrote: I have never seen an article abt a cell phone cataching on fire but I guess it probably happens. You can add explosions to the hazards associated with cell phones. Federal safety officials say they've received 83 reports of cell phones exploding or catching fire in the past two years. The industry blames counterfeit batteries but others aren't so sure. http://www.consumeraffairs.com/news04/cell_phone_batteries.html The below FAA study of Lithium battery shipments is interesting. too. Excerpts: There has never been a known in-flight fire associated with shipping the batteries in this manner; however, a ramp incident involving palletized batteries has drawn attention to the flammability hazard of primary lithium batteries. The ramp incident occurred at Los Angeles International Airport in April 1999. A pallet of batteries caught fire while being handled between flights. There was no known external ignition source. The nature of lithium fires makes them very difficult to extinguish, with all common extinguishing agents ineffective in controlling the fire. ... discharging the halon after only one battery was ignited had no effect on stopping the propagation of the battery fire to adjacent batteries. The halon extinguished the 1-propanol fire immediately but had no effect on the lithium fire with the exception of turning the normally white sparks bright red. http://www.fire.tc.faa.gov/pdf/04-26.pdf Bright red! How... pretty. There are documented reports of Lithium cell fire or explosion in Automatic External Defibrillators (AED's): The International Association of Fire Fighters has received a report regarding an explosion from an automatic external defibrillator (AED) commonly used by the fire and emergency services. On Friday, October 15, 1999, a Physio-Control LIFEPAK 500 exploded and injured two firefighters. The incident occurred at the Okaloosa Island Fire ... http://www.iaff.org/safe/health/alerts/alert07.html Cortland KA5S ___ 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: e: [Elecraft] Elecraft rigs in Hungary?
1. Elecraft could ask (here?) permission 2. Or simply answer inquiries without publicizing callsigns. 3. It would be great PR even to list the *countries* where they are in use! Cortland KA5S From: Eric Swartz - WA6HHQ, Elecraft [EMAIL PROTECTED] Unfortunately we can't publicize our customer list without permission for pricacy/legal reasons. 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: Subject: [Elecraft] KX-1/MP-1 SWR limits
Fred, I've had pretty good luck on 20 with MP-1 bolted onto an neck-strapped FT-817, but I have to hold onto the radio or use a counterpoise. I suspect your trouble is that a KX1 and its attached wires are too small to give a low feedpoint impedance. You will need a counterpoise (15 or 16 feet) to help with this. Even one counterpoise will give the tuner something to work into. Have yet to try my (used, assembled) K1 with an MP1, however, the K1 manual points out that 2:1 or 3:1 SWR is not going to make much difference. For portable, backpacking, walking cycling, canoeing, skiing, snowshoing, snowmobileing (honest!) and who knows how else Amateur Radio, check out the HFPack group at http://groups.yahoo.com/group/hfpack . Cortland KA5S From: Fred Jensen [EMAIL PROTECTED] seem to come out OK. On 20, with the pre-sets I've been using, the best I can get is about 3:1 according to the KX1 after the ATU relays quit. Questions: 1. Any ideas on what is an acceptable (in terms of actually being able to work someone) SWR for the KX1? 2. As with all antennas, I can tune the antenna for a variety of resistances and reactances. I've been shooting for an impedance magnitude of around 50 ohms. Possibly some combination of R and X is more optimum? It's getting a bit chilly here in N. Cal. to spend time on the deck using trial and error (MN folks get one, and only one, joke apiece regarding chilly) and I was hoping for some accumulated knowlege that will save me from the cold. 73, Fred K6DGW Auburn CA CM98lw ___ 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] Re: Elecraft Digest, Vol 7, Issue 4
Michael, It is not the coil intercepting the magnetic field, but the core, whose effective permeability is being modulated. I had a similar problem some decades ago with a Ten Tec Triton II; when I drove over rebar in the paving, or over steel beams, etc., the PTO would hiccup momentarily as the local magnetic field changed, and the VFO would QSY perhaps 50 Hz even when I turned a corner. For those with a severe problem , a 'hum-bucker might help; in this case, a smaller transformer located on the desktop, whose position and orientation could be changed to null the sizeable field coming from the linear's more distant power supply. More permenant solutions suggest themseves; an iron shield around L30, making L30 air core, or perhaps even adding a regulated core bias current at L30 to swamp the external field. (Like hiring a bagpiper to drown out a neighborhood garage band, but) Cortland KA5S K1'ing since 30 October [EMAIL PROTECTED] wrote: What I don't understand is this: I figure L30 has perhaps 14 turns, and 2.3 ohms winding resistance. I figure that the effective aperture is 1 cm squared. I figure that the winding resistance of T5 is 0.05 ohms, so a 1 gauss vertical 60 Hz field will induce 37 micro volts on T5. That should cause 0.3 Hz FM modulation on 80 meters. No one should notice that? BTW, I calculated 2.3 ohms from the Q, sensitivity at T5 goes way up if L30 has less resistance. ___ 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
