[Elecraft] Size of RFC15 in K2
5707 passed the 'alignment and test, part 1' checks with no problem and I'm well into the 'Assembly, Part II' section. I'm at the point of installing C91, C88 and RFC 15 on the bottom of the rf board at U4. The manual talks about a miniature 100 uH choke, much smaller than the other 100 uH chokes and with a tan body. I have 4 green bodied and one tan bodied 100 uH chokes as indicated in the parts list, but the tan bodied one is pretty close to the same size as the green ones, if any thing a little bigger. I'm sure I can solder it to the indicated location, but is this something I should be concerned about? Thanks for any advice, Bernie Gardner W1AZ ___ 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: KX1 mixer discussion
As you study the act of mixing, you discover it is non-linear. Somewhere there needs to be a non-linear device with current flowing through it usually caused by the LO power injected into it. That is why the LO needs to be a large signal. The bad part of a mixer is it mixes with EVERYTHING! So we put band pass filters in front of the mixer trying to keep unwanted signals out. This is not very effective. A double balanced mixer is just one that keeps the LO signal out of the mixer output, a good idea. But it doesn't effect other inputs except to the extent it tends to attenuate even products. After you go down this path you discover a mixer is a nasty thing. It is sure nice when you find a cheap chip that has everything you want in a mixer. If your designing a receiver you use it. 73 Karl K5DI Ron D'Eau Claire wrote: Thanks for the feedback, Geoff! I can see, intuitively, an advantage of doing the switching in the more predictable environment of the L.O. chain instead of the signal path with who-knows-what coming along the bandpass and feeding relatively high-gain amplifiers after it! Especially when you're already providing a switching square wave as the L.O. signal itself. It reinforces my long-standing belief that mixers produce bizarre environments, electrically, not much unlike what Alice found down the rabbit hole! Ron AC7AC ___ 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] mailman?
I just got my monthly reminder from mailman- [EMAIL PROTECTED]. I also got an identical message from [EMAIL PROTECTED], the same except the reply addresses have been altered. I've never gotten this second message before, and I suspect it is a form of spam (or scam), but I am not sure what it is. Has mailman.qth.net been hacked? Has its mailing list been stolen? or what is up? Does anyone know? thanks, dave belsley, w1euy david a. belsley professor of economics ___ 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] High Curr
You could actually have a problem anywhere between the PA transistor collectors and the antenna jack. ... Just to point out the obvious ... the problem could also be _beyond_ the antenna jack. Mark AD5SS ___ 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] NPO cap's
Tom, You will find the NPO ceramic cap's information via Google under Capacitors Tutorial. Ther are four ranges: Black, Purple, Orange and Yellow. They belong to different values of the capacitors. I think it is a colour scheme used by the Dutch firm Philips. 73, Rob, PA0RBO ___ 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] A Perspective on the Recent K2/K3 Thread
Ladies and Gentlemen, My, there are a lot of good ideas out there for improving a product that is already pretty dad-gum-good...if not dad-gum-great! The K2 in its original formis...well original. Yes, I am defending the basic product and I want to make some comparisons. I would like to know the engineering time of Yaseu/Icom/Kenwood/Ten Tec in comparison with Elecraft. What are the man-hours? What was the R D budget for the new 7000 - 2000 - 480 - Orion - etc., etc., etc. Compared to E - I would think that the budgets of YIKT are a lot bigger. How many designers were involved? How many RF Engineers were involved? How many programmers were involved? How much technology did they incorporate that they had to licence (Rhodes Swartz)? I would like to know the thought process of YIKT for making their rigs self service - where hams can work on their own rig. I would not even attempt that with my 756PROII I wonder how many of the YIKT engineers/designers/managers actually talk with the end user - meet them at hamfests - answer emails - and know alot of them by their first name? All the development was done bywhotwo guys? Wow! Amazing! Incredible! I wonder how YIKT would like to sell over 5700 units of the same model? Now that would be a great deal for anyone? How many YIKT rigs have a price tag that makes your eyeballs bulg? Yes, I know that a full fledge K2 - loaded to the gills - is around 1800 smackers but how can YIKT offer parts and pieces as you can afford them? How does YIKT (Ten Tec is really excluded) offer the incredible help in repair and service? As for operation, what does the K2 not do that YIKT does so much better? When, I first got my K2, I thought that the rig was a transistorized HW-101 ($259 in 1969 dollars) - but I soon realized I was wrong. I would call the K2 the Barry Bonds of the HW-101 - a rig on a life-time of steroids. Feature for Feature, the K2 has it all, but you have to know the rig to really get the operating effciency - but you have the same situation for YIKT. The RX is superb - still holds its own with the news high dollar rigs from YIKT. Size is small - but it was purposely designed that way! This is a portable rig designed for portable operation that has become a desktop rig. Yes, bigger knobs-buttons-and-do-dads would be nice (you see my ham-hock fingers trying to get around the rig) and it is easy to fat-finger the rig. But, it was designed that way. The K2 is an engineering marvel because it is designed for the ham to build it and I am always amazed how much forsight was put into the engineering of the package to accomodate the builder. That alone is astounding. The K2 is one of the capstone (remember, there are more capstones) of a engineering team, close friends, and wonderfull people who put the FUN back in ham radio. The E-Team has done more for HR in the last five years than YIKT. Do I want to see at K3? Sure, but it would be hard to top the K2...and I look forward to seeing what the boys from Aptos (and all their cronies) come up with. I truely appreciate the K2 as a radio - as a work of art - and an engineering acomplishment that should win national awards. Lee Buller K0WA In our day and age it seems that Common Sense is in short supply. If you don't have any Common Sense - get some Common Sense and use it. If you can't find any Common Sense, ask for help from somebody who has some Common Sense. ___ 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: A Perspective on the Recent K2/K3 Thread
Lee Buller wrote: Ladies and GentlemenI would call the K2 the Barry Bonds of the HW-101 - a rig on a life-time of steroids. blush Well, it was designed just down the road from San Francisco :) We appreciate your elegant synopsis, Lee. Thank you! 73, Wayne N6KR --- 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] For Sale HP 8640B---NOT
Hi, Well it looks like Murphy has struck me hard. I received a few inquiries regarding the HP 8640b, some requesting pictures. So I figured I'd show the generator into a frequency counter and scope. I noticed some erratic readings on the freq. counter, so I hooked up the scope and saw the amplitude was erratic as I switched the attenuator. Some positions showing nothing. By touching the wafer of the attenuator switch (inside rear) the readings changed. Put some deoxit on the contacts, rotated the switch, and now.No Output. The internal freq. counter shows its oscillating but still no output. The AM and FM modulators still work. So, final outcome isI cannot sell it as working, and don't have the skills or desire to mess with it. I DO have the service manual on CD. Many have asked if the attenuator works, I think so. I say this because I disconnected the output of the RF assembly BEFORE it goes to the attenuator, and there is NO OUTPUT from the RF assembly (yet the internal freq. counter shows RF and changes appropriately). I will sell it AS IS with the CD manual, to the highest offer, plus shipping and packing. Don't forget this is very heavy, and will require me to double box, etc. Pick up can be arranged in the Newtown PA or Lawrenceville NJ areas. I can send pictures to anyone still interested. Sorry for any false hopes from the original message. -- 73 Larry WA2DGD ___ 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] 2.25:1 balun
Hi to all the crew I am on the way of refurbishing my Lightning Bolt 2 element delta loop and I am looking either for a spare transformer to feed it or alternatively for a schematic diagram to homebrew the transformer. If anybody owns one of those transformers and would be willing to part with it, please let me know. Any comments or suggestions on how to build this 2.25:1 transformer will be welcome. Thanks in advance and best 72 Vicenç, EA3ADV ___ 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] Los Angeles County Fair Ham Radio Expo
Several Southern California Hams have taken a huge project, the Amateur Radio Expo 2006 which is being held in conjunction with the Los Angeles County Fair. Their vision is to showcase Amateur Radio in all of its forms and functions by providing an interactive experience for guests attending the Los Angeles County Fair. It sounds like a wonderful project and lots of work! They have been given a large space to set up all kinds of events. Check out their website- http://lafair.b2v.org/ for more information. Elecraft is sending down literature and mini-modules for a building demonstration. They are looking for ideas to attract and excite people (focus on kids) to Ham Radio - especially interactive projects. If you have any bright ideas or would like volunteer to help out you may contact: Co-Chair: Joy Matlack, KD6FJV[EMAIL PROTECTED] The fair starts next weekend and runs for 4 weeks so there is lots of opportunity to help out and/or contribute ideas. Lisa ___ 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] First QSO for 5703
I just finished my first QSO with K9CM on 14M. What a great rig and I still need to align the filters better and of course start building all the accessories ending with the KPA100. For now, I think I'll play with the rig for a while and start on the other stuff in a week or so. Thanks to all who listed suggestions that helped me find all my dumb errors! 73, Bill NZ0T ___ 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] 2.25:1 balun
Vicenc, For an impedance transformation of 2.25:1, you need a turns ratio of 1.5:1. You will have to determine the minimum and maximum number of turns required from the core data and the impedance it will connect to. As a general rule, you need about 5 times the impedance in the winding as you have in the load. Of course the wire size and core size must be adequate to handle whatever power you will subject it to. 73, Don W3FPR -Original Message- I am on the way of refurbishing my Lightning Bolt 2 element delta loop and I am looking either for a spare transformer to feed it or alternatively for a schematic diagram to homebrew the transformer. If anybody owns one of those transformers and would be willing to part with it, please let me know. Any comments or suggestions on how to build this 2.25:1 transformer will be welcome. Thanks in advance and best 72 Vicenç, EA3ADV ___ 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] K2-no power output
I just finished installing the KDPS2 boards and they check out OK. I also have the KAT2 installed and it was working. I was going to operate today for the first time but when pressing TUNE, I'm not getting any power out. I have an external watt meter too. When I press TUNE, I see Atu on the right side of the LCD then it quickly flashes to 1.0-1 on the left side , then displays Lo P. I've changed bands and frequency's up down but do not here the relays in the antenna tuner clicking as before. I went through the various relays through the MENU and I can here each individual relay click just as I did when first testing the KAT2 option. Nothing on CW or SSB. I switched to ANT2 which is my Elecraft Dummy Load with the same thing happening so it isn't a problem with the antenna. The KAT2 manual says that when this happens to increase the power which I did in steps up to 15 watts with no change. Am I missing a setting or does the KDSP2 board have something to do with this. I believe I installed the top cover correctly and have all the wires connected after installing the DSP boards. Any suggestions ? THANKS.Gary WD8ICX ___ 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-no power output
Are you by any chance in TEST mode?? If so the c and the underline on the display will be blinking and you'll get no power output. Hold the MODE button to return to normal operation. Ron AC7AC -Original Message- I just finished installing the KDPS2 boards and they check out OK. I also have the KAT2 installed and it was working. I was going to operate today for the first time but when pressing TUNE, I'm not getting any power out. I have an external watt meter too. When I press TUNE, I see Atu on the right side of the LCD then it quickly flashes to 1.0-1 on the left side , then displays Lo P. I've changed bands and frequency's up down but do not here the relays in the antenna tuner clicking as before. I went through the various relays through the MENU and I can here each individual relay click just as I did when first testing the KAT2 option. Nothing on CW or SSB. I switched to ANT2 which is my Elecraft Dummy Load with the same thing happening so it isn't a problem with the antenna. The KAT2 manual says that when this happens to increase the power which I did in steps up to 15 watts with no change. Am I missing a setting or does the KDSP2 board have something to do with this. I believe I installed the top cover correctly and have all the wires connected after installing the DSP boards. Any suggestions ? THANKS.Gary WD8ICX ___ ___ 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-no power output
Gary, This problem has nothing to do directly with the installation of the KDSP2. Think of whatever else you may have accidently touched - the KAT2 cables are a relevant example. Remove the KAT2 and feed the K2 directly into a 50 ohm dummy load - when you press TUNE you should see the output power displayed (and it will be accurate if you have a good 50 ohm dummy load). That will tell you if the K2 is capable of producing the required power output. If you do see the proper power output with the ATU disconnected, look for the problem with the ATU. Check your K2 to KAT2 coaxial cable carefully to be certain the pins are properly seated and the wires for the coax are not broken at either end - sometimes they will break with a bit of flexing if they are not properly soldered. If you get no output with the ATU disconnected, then prepare yourself for the Transmit Signal Tracing that is detailed in the Troubleshooting section of the manual. You will need the RF Probe assembled (or an oscilloscope with a 10X probe) for that testing. 73, Don W3FPR -Original Message- I just finished installing the KDPS2 boards and they check out OK. I also have the KAT2 installed and it was working. I was going to operate today for the first time but when pressing TUNE, I'm not getting any power out. I have an external watt meter too. When I press TUNE, I see Atu on the right side of the LCD then it quickly flashes to 1.0-1 on the left side , then displays Lo P. I've changed bands and frequency's up down but do not here the relays in the antenna tuner clicking as before. I went through the various relays through the MENU and I can here each individual relay click just as I did when first testing the KAT2 option. Nothing on CW or SSB. I switched to ANT2 which is my Elecraft Dummy Load with the same thing happening so it isn't a problem with the antenna. The KAT2 manual says that when this happens to increase the power which I did in steps up to 15 watts with no change. Am I missing a setting or does the KDSP2 board have something to do with this. I believe I installed the top cover correctly and have all the wires connected after installing the DSP boards. Any suggestions ? THANKS.Gary WD8ICX ___ 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] Rigblaster Pro RF issue
Sorry that is not a directly K2 related question, but this list has more ham brains located in one place than any other place I know. I have always appreciated the help I have found here from the members. I am running a RIGblaster Pro with my K2. Under QRP conditions, I have no problems. However, on 40m 80m QRO with an external amp, I am finding that I am getting serious RF getting back into the rigblaster. I have isolated it to the rigblaster's microphone cable that connects the K2 to the rigblaster. I am certain this is the path of the RF because I can replace the rigblaster mic cable with the K2s regular microphone and use its PTT and couple the sound from my headphones into the mic and get transmit without the RF crap on output. My question is this. What is the best way to eliminate the RF on the rigblaster's mic cable? Would several ferrite beads do the job? Anyone else ever have this problem or have suggestions? 73, Bill Allen WA5PB ___ 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 Pro RF issue
Bill, The very best way to combat RF Feedback is to eliminate it at its source - the antenna. Balanced resonant antennas with a balun at the feedpoint usually are no problem. Balanced fed non-resonant antennas with careful consideration to the run of the parallel feedline away from the antenna are not usually a problem either. Offcenter fed antennas and end fed wires are difficult to tame, as are balanced antennas having a high impedance feedpoint at the shack end of the feedline. Vertiacal with an adequate ground system are usually tame, but verticals with an inadequate ground or resonant ground plane suffer from the same RF-in-the-shack problems as end fed wires. All that being said, one can experiment with counterpoise wires at the shack end to determine if the RF is really the problem. Cut a quarterwavelength wire for the band to be tested and attach one end to the tuner or amplifier ground - the far end is open circuit, just like the end of an antenna - it will contain high RF Voltages, so be certain it is in the clear and out of contact range of humans and pets. If the counterpoise wire solves the problem, it can be used permanently, or one can vow to solve the real problem in the antenna system. In addition to considerations at the antenna system, be certain the mic jack is grounded, and be certain a shielded cable is used between the RigBlaster and the transceiver - that may or may not help. Often grounding only one end of the cable shield will help - experiment to determine which end is more effective, but usually the end connected to the transceiver is the one to ground. Be certain you have not negated the ground isolation between the computer and the transceiver with your connections to the RigBlaster - there are many 'sneak' ground paths that can exist, do not ignore any of them. If you extend the transceiver ground area to other cables and the computer that is just more area for stray RF to impinge upon and cause trouble. Suspect everything until it can be eliminated from th esuspect list. 73, Don W3FPR -Original Message- Sorry that is not a directly K2 related question, but this list has more ham brains located in one place than any other place I know. I have always appreciated the help I have found here from the members. I am running a RIGblaster Pro with my K2. Under QRP conditions, I have no problems. However, on 40m 80m QRO with an external amp, I am finding that I am getting serious RF getting back into the rigblaster. I have isolated it to the rigblaster's microphone cable that connects the K2 to the rigblaster. I am certain this is the path of the RF because I can replace the rigblaster mic cable with the K2s regular microphone and use its PTT and couple the sound from my headphones into the mic and get transmit without the RF crap on output. My question is this. What is the best way to eliminate the RF on the rigblaster's mic cable? Would several ferrite beads do the job? Anyone else ever have this problem or have suggestions? 73, Bill Allen WA5PB ___ 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] K2 Tilt Bail Alternative
I was looking at the Elecraft Picture Gallery (http://www.elecraft.com/PictureGallery/pics.htm) and at the bopttom I saw a couple of pics of DL2DE's K2 (http://www.elecraft.com/PictureGallery/pics.htm, http://www.elecraft.com/PictureGallery/newpics5/dl2de_k2side.jpg) with some sort of flip feet that I would like to get a pair of for my future K1. Does anyone know where I could get a pair of these? David, k3tue . ___ 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 Tilt Bail Alternative
http://www.elecraft.com/PictureGallery/pics.htm http://www.elecraft.com/PictureGallery/newpics5/dl2de_K2.JPG http://www.elecraft.com/PictureGallery/newpics5/dl2de_k2side.jpg --- David Toepfer [EMAIL PROTECTED] wrote: I was looking at the Elecraft Picture Gallery (http://www.elecraft.com/PictureGallery/pics.htm) and at the bopttom I saw a couple of pics of DL2DE's K2 (http://www.elecraft.com/PictureGallery/pics.htm, http://www.elecraft.com/PictureGallery/newpics5/dl2de_k2side.jpg) with some sort of flip feet that I would like to get a pair of for my future K1. Does anyone know where I could get a pair of these? David, k3tue . ___ 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
