Re: [Elecraft] Re: K2 assy: oops: threw out filter bag with alignment # on it
Allen C. Ward wrote: Several times I have found small parts clinging to the paper debris after they came up missing. So true...one small inhibiting factor acting against me starting K2 1641 (for five years!) was that one resistor pack came up missing during the initial inventory. While completeing the (much delayed) inventory, I found the errant RP stuck under the flap of one of the envelopes. 73 de Maggie K3XS -- -/___. _)Margaret Stephanie Leber CCP, SCJP/The art of progress / /(, /| /| http://voicenet.com/~maggie SCWCD/ is to preserve order/ ---/ / | / | _ _ _` _ AOPA 925383/ amid change and to / --/ ) / |/ |_(_(_(_/_(_/__(__(/_ K3XS / preserve change amid/ -/ (_/ '.-/ .-/ARRL 39280 /order.-A.N.Whitehead/ /(_/_(_/___AMSAT 32844_/[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
[Elecraft] K2 Pre Filter
We are getting a lot of requests for the parts to make G3RXQ's K2 Pre Filter. To facilitate this, we have made a build list with all the parts that we can supply for a nominal charge. The list is based on the description and schematic found on G3RXQ's website. Included are the crystals, caps, toroids, magnet wire, a pc board and an 8 pin connector. The total cost for the parts is $29.00, plus shipping (and CA tax to orders inside California). Please order by part K2PREFILTER. While we encourage hams like you to explore and try new circuits and ideas with our products, please be aware that any modifications to our products come at a tradeoff to the original design. Here are some guidelines from the owners of Elecraft and designers of the K2, Wayne Burdick and Eric Swartz... 1. Overall receiver gain and noise figure may degrade because the added crystal filter will have some loss of around 5 dB. 2. K2s with older crystals in their RF board and KSB2 filters may not have the exact same center frequency as the ones we're using (and shipping) now. The effect would be that the new filter would overlap the old, reducing the effective bandwidth on receive. The only way to ensure that this doesn't happen on older K2s would be to replace all 14 crystals (RF board and KSB2). A new set of 14 matched crystals can be ordered from Elecraft as part K2KSB2XTLS. 3. The crystal filter does not have the pad in front of it. The Pad normally is either part of the KNB2 or the PCB if no KNB2 is installed. (The pad gives the 2N5109 amp stage before it a good return loss match.) It will degrade K2 IMD Dynamic range by over 10 dB (IMDDR3 and IP3) without this pad. Reinstalling the PCB pad will not help as it would end up between the two SSB xtal filters. 4. Finally, you should be aware that the KDSP2 does the same thing for ultimate rejection, since the regular filter more than filters enough to keep off freq signals from pumping the K2s AGC, allowing the DSP to clean up any residual blow-by. Thanks, Wayne and Eric! So, evaluate the data on G3RXQ's website and what we are presenting in this email and order accordingly. 73, Brian Broggie - W6FVI Elecraft Parts ___ 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] Elecraft or Witchcraft???
Hi all! I´m right now getting near the end of my K1-project. Receiver works like a dream, but I think I´m getting mad when I´m trying to get ANY power out from the transmitter. The output meter shows P 0.1 and my WM-2 wattmeter shows 0.000 mW I started to suspect that something was wrong with some of the toroids and I rewound and resoldered T4. Did the tranmitter alignment afain on 10 MHz, and BANG! There it was! 2 watts of output power. I tapped the MSG button and pushed the two WPM buttons again to continue the alignment. No problems att all. I felt satisfied when the WM-2 showed roughly 2.2 watts of output and the the K1 display showed 2.5 watts. That called for a celebration, so I tapped the MSG button again to abort Tune and went out to make myself a well diserved cup of coffee. I was out for about ten minutes and went back to the shack to continue with the transmitter alignment on 7 MHz. I just wanted to make another check on 10 MHz and I pushed the two WPM buttons again... K1 display showed P 0.1 and the WM-2 showed zero output. Now, what´s going on here? Is the rig re-aligning itself when nobody is looking at it or..? Think I´m going insane here... Hans / LA2MOA ___ 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 or Witchcraft???
Sounds like you might have a bad hetrodyne crystal on 40 meters. If you have a general coverage receiver tune it to the oscillator frequency and see if you hear a strong carrier when you move the antenna near the crystals on the filter board. If not you may have a bad crystal or a bad solder connection on the relays that switch then in and out. Next look at the solder connections on the filter board very closely. 73 Jim Younce K4ZM ___ 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] N2CQ QRP Contest Calendar Mar 17-31, 2005
~~ N2CQ QRP CONTEST CALENDAR March 17-31, 2005 ~~ 40 METER FOXHUNT - Each Friday, 0200z to 0359z (Thurs 9 PM to 11 PM EST) (Ends Mar 18, 0359z) Info: http://www.cqc.org/fox/index.htm Truffle Hunt - 30 min before Fox Hunt Info: http://fpqrp.com ~~ Ten-Ten Mobile QSO Party (CW/SSB) ... QRP Category Mar 19, 0001z to 2359z Rules: http://www.ten-ten.org/calendar.html ~~ Russian DX Contest (SSB/CW) ... QRP Category Mar 19, 1200z to Mar 20, 1200z Rules: http://www.rdxc.org/rulesg.asp ~~ Virginia QSO Party (CW/SSB/Dig) ... QRP Category Mar 19, 1800z to Mar 21, 0200z Rules: http://www.qsl.net/sterling/VA_QSO_Party/2005_VQP_Rules.html ~~ Run For The Bacon (CW) *** QRP Contest *** Mar 21, 0100z to 0300z Rules: http://fpqrp.com ~~ CQ World-Wide WPX Contest (SSB) ... QRP Category Mar 26, z to Mar 27, 2359z Rules: http://www.cq-amateur-radio.com/awards.html ~~ Spring QRP Homebrewer Sprint (CW/PSK31) ... QRP Contest Mar 28, z to 0400z (Sunday Mar 27, 7PM to 11PM EST) Rules: http://www.njqrp.org/data/qrphomebrewersprint.html ~~ Low Power Spring Sprint (CW) ... QRP Category Mar 28, 1400z to 2000z Rules: http://www.sk3bg.se/contest/lpsprspr.htm ~~ QRP BARBERSHOP QUARTET CONTEST (CW QRP)... QRP Contest! Mar 30, 9PM to 11PM EST Rules: http://www.io.com/~n5fc/barbershop_contest.htm ~~~ Thanks to SM3CER, WA7BNM, N0AX(ARRL), WB3AAL and others for assistance in compiling this calendar. Please foreward the contest info you sponsor to [EMAIL PROTECTED] and we will post it and give it more publicity. Anyone may use this N2CQ QRP Contest Calendar for your website, newsletter, e-mail list or other media as you choose. (Include a credit to the source of this material of course.) 72 de Ken Newman - N2CQ [EMAIL PROTECTED] http://www.amqrp.org/contesting/contesting.html http://www.n3epa.org/Pages/Contest/contest.htm ___ 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 phase noise
Thank you for the responses and I'm pleased to get some discussion going on this subject on the reflector. Phase noise has been brought up before, but not discussed in detail. As I said I've had personal emails about this so I know I'm not on my own here. I should point out that my comments were not intended to 'slag off' the K2, and I am not 'obsessed by numbers'. I don't expect the K2 to have lab grade performance, nor to outperform high price rigs. My sole reason for looking into this (believe me I've got better things to do) is due to complaints about my signal on air. These have been from respected and technically competent amateurs. I can go into detail if required. Several months ago I had some exchanges with Gary and Eric, and sent them some analyser plots. More recently I've done comparisons at 300Hz from carrier using a HP8640B as a reference, and I soon should be in a position to produce more detailed plots of the close in phase noise. Although the comparisons I've made clearly show the K2 is inferior to the MP, 870 and a home brew rig in this respect as stated, the phase noise performance to me seems adequate, however, that doesn't explain the comments I've received on air. I get very similar results with two K2's, one built by me and another by GU3MBS, who is a very experienced K2 builder. Both have all the latest mods. At other times I've received good reports, possibly from less critical operators? I want to get to the bottom of this so that I can confidently use my K2 for QRO contesting. The rig has many fine attributes and I take my hat off to Wayne and Eric for their excellent design and production engineering. By the way I've moved the K2 as far as practical from hum sources (2') and even tried enclosing it in a mu-metal shield, so I'm pretty confident that magnetic modulation isn't the culprit. 73 Fraser G4BJM _ It's fast, it's easy and it's free. Get MSN Messenger today! http://www.msn.co.uk/messenger ___ 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 phase noise
Hello boys! I am playing around same problem for last two weeks. I had written to reflector but no one was interested to comment. I am using K2 for HF contesting with LL PA and for VHF contesting with transverter+ LL PA and i also want to have signal clean as much as possible. I was testing K2 on 14MHz with transverter and without it. For detailed information (in numbers) i still need some peace of equipment (step att).I was going from transverter output (abt 1mW sig) directly to a HF RX.Of course, i was increasing noise all over the band but that was not the problem.When i TX in SSB without modulation there are thousends of little birdies (none on CW) all over the entire band, way down from the level of carrier, but there. I am shure abt cause of that birdies is the 4MHz OSC on KSB2 board. What should be done in plus to take the TX noise further down? Suggestions are wellcome. Like Stewart, I would like to see the Top tehnicians to share the knowledge with us on this reflector. Have Fun! S55M-Adi - Original Message - From: Stewart Baker [EMAIL PROTECTED] To: Fraser Robertson [EMAIL PROTECTED]; elecraft@mailman.qth.net Sent: Friday, March 18, 2005 8:15 AM Subject: Re: [Elecraft] K2 phase noise It is my belief that a lot a technical aspects of Elecraft products are being discussed 'Off Reflector' between specific interested individuals. I think that, because these discussions are not seen by the group, a lot of useful information is being missed. I would like to see these in-depth technical discussion treated in the same manner as the what soldering iron should I use ? type threads. Maybe the reflector could be sub-divided ? END OF RANT ... 73 G3RXQ On Fri, 18 Mar 2005 01:26:19 +, Fraser Robertson wrote: Thank you for the responses and I'm pleased to get some discussion going on this subject on the reflector. Phase noise has been brought up before, but not discussed in detail. As I said I've had personal emails about this so I know I'm not on my own here. I should point out that my comments were not intended to 'slag off' the K2, and I am not 'obsessed by numbers'. I don't expect the K2 to have lab grade performance, nor to outperform high price rigs. My sole reason for looking into this (believe me I've got better things to do) is due to complaints about my signal on air. These have been from respected and technically competent amateurs. I can go into detail if required. Several months ago I had some exchanges with Gary and Eric, and sent them some analyser plots. More recently I've done comparisons at 300Hz from carrier using a HP8640B as a reference, and I soon should be in a position to produce more detailed plots of the close in phase noise. Although the comparisons I've made clearly show the K2 is inferior to the MP, 870 and a home brew rig in this respect as stated, the phase noise performance to me seems adequate, however, that doesn't explain the comments I've received on air. I get very similar results with two K2's, one built by me and another by GU3MBS, who is a very experienced K2 builder. Both have all the latest mods. At other times I've received good reports, possibly from less critical operators? I want to get to the bottom of this so that I can confidently use my K2 for QRO contesting. The rig has many fine attributes and I take my hat off to Wayne and Eric for their excellent design and production engineering. By the way I've moved the K2 as far as practical from hum sources (2') and even tried enclosing it in a mu-metal shield, so I'm pretty confident that magnetic modulation isn't the culprit. 73 Fraser G4BJM _ It's fast, it's easy and it's free. Get MSN Messenger today! http://www.msn.co.uk/messenger ___ 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
