[Elecraft] SW broadcast to calibrate against.
Calibrating one 1 ppm TCXO against another 1 ppm TCXO calibrator (for those with the optional extra K3 KTCXO3-1) would not be a good idea. In any event the calibrator is going to drift with time and need calibrating itself every year or so. G4JNT published a 60 KHz off air frequency standard in the RSGB publication RadCom in April 1994 (Mk 1 version) and March 1996 (Mk 2 version). I have used his Mk2 version for some years and it works well, admittedly it's only good to a short term stability of 1 part in 10^8 but that's still 50 to 100 times more stable than the TCXO in a K3 you are trying to calibrate. Long term the stability matches that of the national standard being broadcast. Cost of building is minimal, even allowing for the box, switches, paint, etc. I would expect a lot of change from $80 or £40. On eBay GPS and rubidium units appear from time to time, I bought a GPS unit part kit, built by the guy who later sold another one: http://cgi.ebay.co.uk/GPS-10Mhz-FREQUENCY-STANDARD-COMPUTER_W0QQitemZ120166344327QQihZ002QQcategoryZ25399QQssPageNameZWDVWQQrdZ1QQcmdZViewItem He seems to like making GPS standards, so maybe worth dropping him an e-mail? 73 Dave, G4AON K3/100 #80 --- Rather than a BC station, how about a fairly accurate 10Mhz frequency standard like http://www.aade.com/freqstd/freqstd.html 73 to all Trevor G0KTN ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] K3 S/N 60 arrived in Tokyo
K3 S/N 60 arrived here on Dec 29, 2007. It is K3/10+KAT3+200Hz Xtal filter (assembled) I suppose it is one of first K3s in JA ordered by EDC, agency in JA. I have already ordered KRX3, KPA3 and 400Hz Xtal filter. K3 works GREAT as expected for CW and digital mode. (I do not work SSB at all !) My OLD K2 (S/N 4504) is now spare tranceiver. Thanks de aki ja1nlx ___ 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] SW broadcast to calibrate against.
GB3RAL at 50.05MHz should be a good signal in Warfield. I do not know how accurate it is, it is well beyond my ability to measure it here at home. The reference it is driven from is locked to GPS with a long time constant and should be close to one part in 10^10. However, the frequency is DDS derived and there may be a very small fixed offset error of a mHz or so due to the limitations of a 48 bit frequency control register. For most purposes it will do. There is also a companion beacon on 70.05 MHz you could use. Mike Ian White GM3SEK wrote: David Ferrington, M0XDF wrote: I'd like to get a list of KNOWN frequencies of broadcast stations in 10 - 40m in the UK - it's been pointed out tpo me that using BBC WS at 648 KHz is a not so good, because its a low freq. The higher the reference frequency, the more accurately you can set the TCXO. Don't forget you have 50MHz now, and from your Callbook QTH in IO91, you may be able to receive the GB3RAL beacon on 50.050MHz. (I'm fairly sure it is locked to GPS, but not sure about ERP and operational status... we'll soon find out, because Mr Beacon Keeper is an Elecraft user!) -- 73 from Ian GM3SEK ___ 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 -- View this message in context: http://www.nabble.com/SW-broadcast-to-calibrate-against.-tp14777212p14783758.html Sent from the Elecraft mailing list archive at Nabble.com. ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] SW broadcast to calibrate against.
Thanks Trevor, but of course, I wanted something now, and not when I've built it :( And I have the 1ppm TCXO, so when firmware permits me to enter the offsets from its calibration sheet, I'll be all set. And Elecraft make the XG1 and XG2 kits too. On 12/1/08 23:47, Trevor Smithers [EMAIL PROTECTED] sent: Rather than a BC station, how about a fairly accurate 10Mhz frequency standard like http://www.aade.com/freqstd/freqstd.html 73 to all Trevor G0KTN -- For all our conceits about being the center of the universe, we live in a routine planet of a humdrum star stuck away in an obscure corner ... on an unexceptional galaxy which is one of about 100 billion galaxies. ... That is the fundamental fact of the universe we inhabit, and it is very good for us to understand that. -Carl Sagan, astronomer and writer (1934-1996) ___ 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] New K3 SN#207 built but question on AM Filter
Paul Webb wrote: now when i select SSB and tune to a AM signal i can alter the ] bandwidth to anything up to 6KHz, when i switch to AM i can only adjust ] the bandwidth up to 3KHz , the audio sounds like it is a 3KHz filter ] too, what am i doing wrong since i cant set the 6KHz bandwidth in AM. any ideas??? The basic reason has already been explained, however, there are very few cases were exceeding 3kHz audio bandwidth is useful. HF broadcast stations use 5kHz channelling, which would only allow them 2.5kHz with brick wall filtering at both transmit and receive ends, although they probably do expect to suffer significant adjacent channel interference. MF broadcast stations use 9kHz channelling in Europe and 10kHz in the USA, but I suspect that adjacent channel interference is less acceptable. As they were designed to be received with LC IF filters, with poor shape factors, I suspect they don't even make use of the full channel, and if they did, they would probably be required to have filters which put the adjacent channel into the filter stop band. [ Note: excessively long lines re-wrapped. See RFC 1855. (Probably using yahoo.) ] -- David Woolley Emails are not formal business letters, whatever businesses may want. RFC1855 says there should be an address here, but, in a world of spam, that is no longer good advice, as archive address hiding may not work. ___ 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] SW broadcast to calibrate against.
David Ferrington, M0XDF wrote: I'd like to get a list of KNOWN frequencies of broadcast stations in 10 - 40m in the UK - it's been pointed out tpo me that using BBC WS at 648 KHz is a not so good, because its a low freq. The World Service is on on multiple HF frequencies and there are also BBC transmissions for specific regions. I imagine the BBC web site will give details. The actual high precision BBC transmission is at 198.00 kHz, but that is even lower in frequency. In practice, though, most Euopean HF broadcast stations are on properly assigned frequencies and therefore are on multiples of 5kHz. You will probably get quite a good estimate by simply finding the largest cluster of stations with the same apparent offset from this, which will represent your tuning error. (European LF and MF stations use 9kHz channels. Droitwich used to be on 200.0 kHz, before this was standardized.) With a respectable crystal, you should be well within 300Hz at 30MHz, so there should be no problem in knowing which 5kHz you are on. (Hope I have the right number of zeroes in the above, and that Droitwich is still a frequency standard.) -- David Woolley Emails are not formal business letters, whatever businesses may want. RFC1855 says there should be an address here, but, in a world of spam, that is no longer good advice, as archive address hiding may not work. ___ 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] EU 30 Meter Digital Weekend 19th-20th Jan
Wondering what to do with your new K3? There is going to be a lot of ragchewing on data modes next weekend on 30m, so get those leads connected and get typing! http://www.30meterdigital.org/30mevents.html 73 Dave, G4AON K3/100 #80, HRD/DM780 software on data modes ___ 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 diffuser
I'm having a problem with d2 and d3 leads on the diffuser(very short) even a replacement one..The leads just make it thru one spacer..the only way I see a fix is using a solder bridge or try to extend the leads?Anyone come across this? Thanks Frank -- View this message in context: http://www.nabble.com/k2-diffuser-tp14785245p14785245.html Sent from the Elecraft mailing list archive at Nabble.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] K2 audio loss
I was working a contest this weekend and at one point the audio in my K2 just stopped working. No audio on headphones or internal speaker. At full volume I could hear a slight trace of noise on the speaker. I reset power, and the audio came back. I guess I should have checked the external speaker jack, but in my panic, I did not. Does this sound like it could be the infamous headphone jack problem? When that does fail, does the external audio still work? I can not risk a failure during a contest, so I wonder if I should replace it. 73, Tom KG3V ___ 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 K1 questions
Hi Chris, I have learned not to trust the K1's power indication during antenna tuning with an external tuner. The reflected power seems to throw off the value displayed on the K1. Try this... after you have tuned for best SWR go into the power out menu and bump it up a 10th of a watt and then bump it back down a 10th of a watt. Just temporarily changing this menu setting seems to recalibrate the output power display. It is also my understanding that the circuitry that measures the output power is somewhat influenced by the SWR and cannot be completely trusted unless it is very close to 1:1. I actually use my K1 as my main rig. I'm sure that you will enjoy yours. 73 Paul - N8XMS ___ 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 diffuser
Hi Frank, I solved the problem by using one spacer at both sides, put 4 short leads from used glass diodes in the spacer, with the diffuser diode leads at the other end. Press the spacer to the diffuser and solder with as little tin as possible. Now you have 4 long leads. Mount the assembly, not putting the leads through the second set of spacers, as this will not fit. Use the other spacers to get the right distance between the first spacers and the pcb. Just hold them somewere in the middle between the extended diode leads and solder at the bottom. Then remove the second set of spacers. Worked fine with me. Best 73, Gerard PA1GP - Original Message - From: cfd [EMAIL PROTECTED] To: elecraft@mailman.qth.net Sent: Sunday, January 13, 2008 1:57 PM Subject: [Elecraft] k2 diffuser I'm having a problem with d2 and d3 leads on the diffuser(very short) even a replacement one..The leads just make it thru one spacer..the only way I see a fix is using a solder bridge or try to extend the leads?Anyone come across this? Thanks Frank ___ 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] K1 questions
Dave, Great information. Very nice PDF file. Best, DW Holtan WB7SSN - Original Message - From: Dave G4AON [EMAIL PROTECTED] To: elecraft@mailman.qth.net Sent: Sunday, January 13, 2008 12:52 AM Subject: [Elecraft] K1 questions Chris You would only need to re-calibrate the VFO if you swap a board which has the same band as the other one, ie I have a 80/40 two band board for Winter use and a 40/30/20/15 one for summer, I have to re-set the 40m calibration when changing the boards as the two 40m band crystals differ in frequency slightly. You do have to tell the K1 which bands are on the board, but that is easy and can be done in the field. Have you picked up the old tip of threading a rubber band through the spacers to make swapping boards less of a juggling act? The rubber band holds the spacers on the long bolts and still allows you to tighten everything up. You can add capacitance to a KAT1 to improve the low frequency tuning ability, I've done that with mine. See: http://www.astromag.co.uk/k2/g4aon_kat1_mods.pdf for details of an easy and reversible modification. 73 Dave, G4AON K1 #1154, K2 #1892, K3/100 #80 --- I recently purchased a K1 for use at our vacation QTH, and gave it its first workout today during NAQP. It's not a contest rig, but it did just fine :-) I've got a couple of questions: - I have two band modules: 40/30/20/15 and 80/17. Do I need to do any recalibration when I swap? How involved is this? - I have a KAT1, and it worked fine until I tried to use my W3EDP on 40m. It's not really a W3EDP because I feed it remotely with coax and a BL2 balun. I have the 'output' menu item set to 5W. If I use the 4:1 setting on the BL2, the KAt1 would get down to about 1.7:1, but the max output was 3.8W (according to the display). If I use the 1:1 setting, it would only get down to 3.6:1 or so, but was happy to send 5W out. Huh? 73 de chris K6DBG ___ 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] Wiring a K2 to 2 transverters
Hi I need some advice on wiring my K2 to two transverters. I've got a newly built XV50 and a homebrew 2 meter transverter. I've run each of them individually with the K2, using the KIO2 to control the XV50 and a WA6HHQ (see http://www.elecraft.com/Apps/Amp_keying_ckt.htm) keying circuit for the hb 2 meter xverter. But I've never had both transverters hooked up at the same time. I'd like to have both transverters wired to the K2 at the same time and be able to use them with little (or no) manual intervention. The ARRL VHF/UHF test is coming up next weekend and I'm looking for a way to band switch as easily as possible. Is it as simple as hooking the XV50's RxOut/IF2 to the 2 meter transverter 28MHz input and putting a spst switch in the 2 meter trasverters keyline? Or will that not work? Or is there a better way? Thanks in advance for your advice. 73, Lenny W2BVH ___ 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] FS: MixW RigExpert and Ten-Tec 6m transverters
Apologies for posting this, but the following two items that I'm selling on eBay might be of particular interest to K2 owners: MixW RigExpert USB interface with K2 connecting cable: http://xaddr.com/2gi Ten-Tec T-Kit 20m to 6m transverter, drive from K2 ANT 2 in xverter mode: http://xaddr.com/2gj In case you're wondering, xaddr.com is yours truly's rival to TinyURL. Feel free to use it whever you need to shorten a long address, and help support a ham-owned and operated business. :) - Julian, G4ILO K2 s/n: 392 K3 expected 14 January G4ILO's Shack: www.g4ilo.com Zerobeat Ham Forums: www.zerobeat.net/smf -- View this message in context: http://www.nabble.com/FS%3A-MixW-RigExpert-and-Ten-Tec-6m-transverters-tp14787959p14787959.html Sent from the Elecraft mailing list archive at Nabble.com. ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] New K3 SN#207 built but question on AM Filter
I would. :=) I'm not a hardcore ham operator, and one of the big selling points for the K3 for me was getting excellent broadcast radio receive capability (say, on par with a Drake R8B or AOR7030). (I currently run a K2-100 with which I'm very satisfied.) - Paul, N6LQ --- Dave Martin [EMAIL PROTECTED] wrote: I've seen a number of old U.S. broadcast receivers with a 10 KHz notch filter in the audio to get rid of the high pitched hetrodynes from the adjacent channels. But the wide IF sure brightens up the music when listening to your local honky-tonk station, and nobody gave a rip how wide their IF was if their music sounded good. That's why I was hoping for the option of going as wide as I see fit when conditions allow. But then who (other than yours truly) would be using a K3 to listen to the local BC when he could be working CW while enjoying 100 Hz selectivity? Dave W5DHM The basic reason has already been explained, however, there are very few cases were exceeding 3kHz audio bandwidth is useful. HF broadcast stations use 5kHz channelling, which would only allow them 2.5kHz with brick wall filtering at both transmit and receive ends, although they probably do expect to suffer significant adjacent channel interference. MF broadcast stations use 9kHz channelling in Europe and 10kHz in the USA, but I suspect that adjacent channel interference is less acceptable. As they were designed to be received with LC IF filters, with poor shape factors, I suspect they don't even make use of the full channel, and if they did, they would probably be required to have filters which put the adjacent channel into the filter stop band. ... David Woolley ___ 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 Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ ___ 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] ATTN: Bill Fogle - KE5KWE
Bill, I've replied to your messages, but my messages are being rejected by yahoo. Do you have another address I can use? Rose Kopp - N7HKW [EMAIL PROTECTED] or [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] Need Help with K1 ATU
I just bought a used K1 and am having issues getting it to work. From what I understand I should be able to go from the Menu to the ATU mode and then hit the WMP+ and WPM- buttons at the same time to go into tune mode and then hear the tuner make adjustments. When I do this it just goes into Pfn mode and the auto tune is not working. The transmitter is working I just can't get the Auto Tune to work. Thanks for your help!! Norm K9NK ___ 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] KUSB Update
I was having difficulty updating my K3 with the latest version of the DSP code. On Greg's recommendation I updated the KUSB driver and that solved my problem. I could not find the link to KUSB driver on the Elecraft site, but found them on www.prolific.com.tw. The device is PL-2303. I updated the driver from 2.0.0.18 to 2.0.2.8 (on WinXP SP2) and it solved the DSP update problem via KUSB. Raj, N2RD K3 #170 K2 #5613 ___ 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] Need Help with K1 ATU
Is the ATU enabled in the menu? It should show Tun in the menu... (press menu, scroll up and down to ATU, then press and hold menu). Dave === I just bought a used K1 and am having issues getting it to work. From what I understand I should be able to go from the Menu to the ATU mode and then hit the WMP+ and WPM- buttons at the same time to go into tune mode and then hear the tuner make adjustments. When I do this it just goes into Pfn mode and the auto tune is not working. The transmitter is working I just can't get the Auto Tune to work. Thanks for your help!! Norm K9NK ___ 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 Hi Cur
How are you measuring those voltages? In any case, it looks like the driver is not working. You will have installed a nylon standoff on it, I would look for a short around that area. Mike Bo Andersson wrote: Hi! After building and installation of K60XV, I got problem with Hi Cur when testing transmission. All around K60XV, as receive and settings for transverter acts as exspected. Regardless if I set Power to 0,2 or 15 Watts or changning Cal Cur, I got Hi Cur and I can see on may power supply, radio drawing 3,5 amp. I make some test from K2 Manual appendix E, Troubleshooting Page 13 around ALC Power Control Test VPWR reading was 1.10 VDC Expected 0.7 - 2.5 VDC, no problem Page 14 Pre-Driver, Driver and PA Driver Input Reading: 1.71 Vrms Expected: 0.026 Vrms Driver Output Reading: 0.416 Vrms Expected: 1.8 Vrms PA Input(Q7) Reading: 0.8 Vrms Expected: 0.38 Vrms PA Input(Q8) Reading 0.39 Vrms Expected: 0.38 Vrms RF Detector Input Reading 0.4 Vrms Expected: 2.0 Vrms It seems that one or both PA transistor could be defective. Measure Diode/Transistor as point 7. + = positive lead to - = negative lead to Q7 B C E + 0.68K 0.68K - 6.0k 0.85K Q8 B C E + 0.68K 0.68k - 6.0K 0.85K I hope some one can read and understanding my measure and perhaps have an idee around this problem. 73's Bo/SM6FPG ___ 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 -- View this message in context: http://www.nabble.com/K2-Hi-Cur-tp14785526p14789260.html Sent from the Elecraft mailing list archive at Nabble.com. ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE: [Elecraft] SW broadcast to calibrate against.
Ian wrote: The higher the reference frequency, the more accurately you can set the TCXO --- Is that correct? I don't know the details of Wayne's firmware, but the accuracy of a synthesized rig is normally independent of the frequency being received. I go for the highest frequency standard available when I'm trying to zero beat some lower-frequency oscillator as accurately as possible (such as when I set my 4.000MHz counter reference oscillator zero beat to WWV at 20 MHz), but that I don't believe that's what we're doing here. The accuracy at 50 MHz should be the same as at 500 kHz, excluding any rounding errors in the algorithm math. I have set my K3 on a BCB band station at 830 kHz to within 1 Hz and noted that WWV at 15.000 MHz is still within 1 Hz. 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] AF1 - couple of questions
I picked up the lexan cases for the AF1 and W1 from W8FGU. Very nice, well made products by the way. Questions; 1. - I am currently running the AF1 with a 9v battery, but I will be connecting it to 12v supply here in the shack. I was going to leave the 9v battery installed, as it appears the diodes that are part of the circuit will protect it. But wanted to confirm. The case is clear, so I can also keep an eye on the battery, but I wanted the battery in, in case I wanted to operate away from the shack. 2. - I performed the circuit changes documented in the errata, and the AF1 works fine with headphones (stereo jacks), but it does not seem to work with any of my external speakers. Did I loose that option when I made the changes in the errata? They seemed to be required for it to work with headphones. Dave Wilburn K4DGW K2/100 - S/N 5982 ___ 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] KUSB Update
Hi, Raj. The link to the Prolific web site for updated drivers for the KUSB is in the k3 Utility Help Troubleshooting section. Yes, I know that no one ever reads Help (me included), but as issues have come up I've tried to add a section that describes the solutions that have been discovered. Eric asked me again for the link and I suspect he's planning to add a link from the Elecraft web site. He's a pretty busy guy, though. Thanks for your note, it's another confirmation that the driver update is consistently resolving this issue. I had updated my Prolific driver some months ago and didn't ran into this issue during development testing. I'll have to find another test machine, I'm using five now... 73 de Dick, K6KR -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Rajiv Dewan, N2RD Sent: Sunday, January 13, 2008 10:26 AM To: Elecraft List Subject: [Elecraft] KUSB Update I was having difficulty updating my K3 with the latest version of the DSP code. On Greg's recommendation I updated the KUSB driver and that solved my problem. I could not find the link to KUSB driver on the Elecraft site, but found them on www.prolific.com.tw. The device is PL-2303. I updated the driver from 2.0.0.18 to 2.0.2.8 (on WinXP SP2) and it solved the DSP update problem via KUSB. Raj, N2RD K3 #170 K2 #5613 ___ 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] Video of my build of K3 S/N 207
If any one wants a look , i took a load of photos while building my K3 and have put them together as a video, i intend to put a voice over explaining the build but have not had time yet. anyway feel free to have a look if you wish. The K3 is now up and running 100% regards Paul http://www.fists.co.uk/K3Build.wmv __ Sent from Yahoo! Mail - a smarter inbox http://uk.mail.yahoo.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Video of my build of K3 S/N 207
Nicely done. Did you use it in the AFS contest this evening? Mike Paul Webb-7 wrote: If any one wants a look , i took a load of photos while building my K3 and have put them together as a video, i intend to put a voice over explaining the build but have not had time yet. anyway feel free to have a look if you wish. The K3 is now up and running 100% regards Paul http://www.fists.co.uk/K3Build.wmv __ Sent from Yahoo! Mail - a smarter inbox http://uk.mail.yahoo.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 -- View this message in context: http://www.nabble.com/Video-of-my-build-of-K3-S-N-207-tp14790503p14790641.html Sent from the Elecraft mailing list archive at Nabble.com. ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] SW broadcast to calibrate against.
Ron D'Eau Claire wrote: Ian wrote: The higher the reference frequency, the more accurately you can set the TCXO --- Is that correct? I don't know the details of Wayne's firmware, but the accuracy of a synthesized rig is normally independent of the frequency being received. The error in ppm is independent of the frequency, but the resulting error in Hz is proportional to the frequency. I go for the highest frequency standard available when I'm trying to zero beat some lower-frequency oscillator as accurately as possible (such as when I set my 4.000MHz counter reference oscillator zero beat to WWV at 20 MHz), but that I don't believe that's what we're doing here. On the contrary, that is exactly what you are doing with the K3 as well. The firmware initially assumes that the TCXO frequency is 49,380,000Hz. The REF CAL adjustment is telling the firmware what the true frequency of the TXCO is, and then the firmware will re-calculate all the transmitted, received and displayed frequencies in proportion to that new value. To set REF CAL with the minimum possible error in ppm, the zero-beating should therefore be done at the highest possible signal frequency. I have set my K3 on a BCB band station at 830 kHz to within 1 Hz and noted that WWV at 15.000 MHz is still within 1 Hz. That is because you did a really good job at 830kHz :-) -- 73 from Ian GM3SEK ___ 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] Video of my build of K3 S/N 207
Paul, Thanks! Good Stuff(tm). matt, W6NIA K3 # 24 On Sun, 13 Jan 2008 20:15:03 + (GMT), you wrote: If any one wants a look , i took a load of photos while building my K3 and have put them together as a video, i intend to put a voice over explaining the build but have not had time yet. anyway feel free to have a look if you wish. The K3 is now up and running 100% regards Paul http://www.fists.co.uk/K3Build.wmv __ Sent from Yahoo! Mail - a smarter inbox http://uk.mail.yahoo.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re[2]: [Elecraft] SW broadcast to calibrate against.
Let me ask this again. Are you saying, that since the mixer signal is a multiple of the TCXO freq that any errors in the TCXO will be magnified as the ref signal goes higher in frequency. This will then magnify the difference in audio note of (say) 10 MHz vs 20 MHz for the same TCXO setting. A one cps zero beat error at 10 MHz will be 2 cps at 20 MHz (or some such)? Mike W5FTD Ron D'Eau Claire wrote: Ian wrote: The higher the reference frequency, the more accurately you can set the TCXO --- Is that correct? I don't know the details of Wayne's firmware, but the accuracy of a synthesized rig is normally independent of the frequency being received. The error in ppm is independent of the frequency, but the resulting error in Hz is proportional to the frequency. ___ 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 filter setup on RTTY
I have seen folks indicate it is necessary to set OP1 as FL1 when calibrating the RTTY filters. Is this true or can you set it to any width as long as the filter is calibrated so the signal is in the center of the bandpass? 73, Charlie, W0YG.. -- View this message in context: http://www.nabble.com/K2-filter-setup-on-RTTY-tp14792145p14792145.html Sent from the Elecraft mailing list archive at Nabble.com. ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] SW broadcast to calibrate against.
W5FTD wrote: Let me ask this again. Are you saying, that since the mixer signal is a multiple of the TCXO freq Multiple isn't quite the right word, but every synthesized signal in the box is directly proportional to the TXCO frequency. If the TCXO is 1 ppm high, for example, then all frequencies derived from it will have that same +1ppm error. that any errors in the TCXO will be magnified as the ref signal goes higher in frequency. This will then magnify the difference in audio note of (say) 10 MHz vs 20 MHz for the same TCXO setting. A one cps zero beat error at 10 MHz will be 2 cps at 20 MHz (or some such)? You got it. So, if you can adjust the REF CAL frequency within 1Hz at 50MHz, then at 1MHz it will be within 0.02Hz. That's the basic principle, anyway. There will be some small errors introduced by the calculations in firmware, as Ron pointed out; and in the longer term the TCXO will drift. -- 73 from Ian GM3SEK ___ 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] Need Help with K1 ATU
Norm, You do not have to enter the menu at all - just press the WPM+ and WPM- buttons at the same time and it will go into tune. If you enter the menu, then the operation of th eWPM+ and WPM- buttons become different because they will change from one menu item to another or after pressing EDIT will change the parameter. Enter the menu only to edit the ATU setting to AUTO, then exit the menu and press the buttons together and it should go into TUNE. 73, Don W3FPR Norm Klieman wrote: I just bought a used K1 and am having issues getting it to work. From what I understand I should be able to go from the Menu to the ATU mode and then hit the WMP+ and WPM- buttons at the same time to go into tune mode and then hear the tuner make adjustments. When I do this it just goes into Pfn mode and the auto tune is not working. The transmitter is working I just can't get the Auto Tune to work. Thanks for your help!! Norm K9NK ___ 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 filter setup on RTTY
Charlie, When the RTTY filter set is selected, the transmission path is through the KSB2 (OP1) filter, so yes, you will have to set RTTY FL1 to OP1 (or OP2 -- OP4, all the same filter). You are placing the filter passband for transmission, and not for receive. FL2 through FL4 can be set to any width you desire - I generally set them for 1000, 700 and 400 and center them at 1000 Hz - then in operation, I tune the desired signal to the vicinity of 1000 Hz with the VFO knob and then click on the software display to fine tune it. Works for me. 73, Don W3FPR Charlie, W0YG wrote: I have seen folks indicate it is necessary to set OP1 as FL1 when calibrating the RTTY filters. Is this true or can you set it to any width as long as the filter is calibrated so the signal is in the center of the bandpass? 73, Charlie, W0YG.. ___ 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] Wiring a K2 to 2 transverters
Lenny, I do believe you could do as you suggest and connect one transverter to the hi-pwr RF output of the K2 and the other transverter to the K60XV jacks as long as you set up the K2 transverter bands properly in the menu. The manual method of controlling the 2 meter transceiver keying you proposed will work fine as long as you remember to close the switch to operate 2 meters and open it when on 6 meters. 73, Don W3FPR w2bvh wrote: Hi I need some advice on wiring my K2 to two transverters. I've got a newly built XV50 and a homebrew 2 meter transverter. I've run each of them individually with the K2, using the KIO2 to control the XV50 and a WA6HHQ (see http://www.elecraft.com/Apps/Amp_keying_ckt.htm) keying circuit for the hb 2 meter xverter. But I've never had both transverters hooked up at the same time. I'd like to have both transverters wired to the K2 at the same time and be able to use them with little (or no) manual intervention. The ARRL VHF/UHF test is coming up next weekend and I'm looking for a way to band switch as easily as possible. Is it as simple as hooking the XV50's RxOut/IF2 to the 2 meter transverter 28MHz input and putting a spst switch in the 2 meter trasverters keyline? Or will that not work? Or is there a better way? ___ 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] FS: Astron 4 AMP Linear Power Supply
The Astron power supply has been spoken for. Thanks, Doug -- K0DXV Doug Person wrote: I'm cleaning out my shack. Many things are going out on eBay. This power supply is perfect for the K2 QRP version (as wells as the K1 and KX1) so I thought I would posted it here before listing it. 4 amps continous, 5 amps peak. Old-fashioned transformer-based power supply. Very well made and in good condition. Has a short piece of cable with a PowerPole already mounted. Reply off-list. Thanks Doug -- K0DXV ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Video of my build of K3 S/N 207
On Sun, 2008-01-13 at 20:15 +, Paul Webb wrote: If any one wants a look , i took a load of photos while building my K3 That's an awesome idea dude! I'm glad I took pics of my K2 build; maybe I'll be a copycat and do the same... -- Justin L Croonenberghs Suppose I called you a liar. And suppose you were a member of Congress. But I repeat myself. -- Mark Twain ___ 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] New K3 SN#207 built but question on AM Filter
On Sun, 2008-01-13 at 02:49, David Woolley wrote: Paul Webb wrote: ... The basic reason has already been explained, however, there are very few cases were exceeding 3kHz audio bandwidth is useful. HF broadcast stations use 5kHz channelling, which would only allow them 2.5kHz with brick wall filtering at both transmit and receive ends, although they probably do expect to suffer significant adjacent channel interference. MF broadcast stations use 9kHz channelling in Europe and 10kHz in the USA, but I suspect that adjacent channel interference is less acceptable. As they were designed to be received with LC IF filters, with poor shape factors, I suspect they don't even make use of the full channel, and if they did, they would probably be required to have filters which put the adjacent channel into the filter stop band. Even with the 10 kHz channel spacing used in the USA, AM broadcast stations do not have 5 kHz audio bandwidth. The FCC requires a guard band between stations. As I recall, rgulations require that the audio start to drop off at about 4 kHz so that it can be down 20 dB or so by 6 kHz (the passband edge of the adjacent station). So there's not much point in the receiver audio being wider than 4 kHz. Al N1AL ___ 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] K2/100 - Power investigation
After trying unsuccessfully to get email to take data in tabs, I ended up just putting the information on my website. Sorry for the trouble. I was playing with an assortment of power meters, and noticed my K2 was reading lower than I expected. The closes things I had to a gauge, was an IC-703+ that had just been to the shop, and repaired, thus I felt it was likely to be putting out 10w. When I compared a Bird 43 with an element I picked up on line, and one that came with it, it read a bit low. But when I used an MFJ949e, it was right on. Gotta run with what I have. So I checked out the K2/100 at what it said was 10w/53w/111w (Full Power). And I got the results, that are displayed here; http://www.k4dgw.com/k2.html The 10w settings seem a little bit more dispersed than I would have thought. The 10m, 12m 20m 53w settings seem a bit low. Then at what the rig says is 111w/Full Power, the rig seems even lower. Do I need to go back through and run the power calibration, or should I start troubleshooting? I have a KAT100, that was powered down, and the power was taken out of the back of the K2/100. -- Dave Wilburn K4DGW K2/100 - S/N 5982 ___ 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] New K3 SN#207 built but question on AM Filter
Even with the 10 kHz channel spacing used in the USA, AM broadcast stations do not have 5 kHz audio bandwidth. The FCC requires a guard band between stations. As I recall, rgulations require that the audio start to drop off at about 4 kHz so that it can be down 20 dB or so by 6 kHz (the passband edge of the adjacent station). I don't think that's right ... or wasn't the last time I was around an AM station (I spent most of my career in TV). I remember the AM guys doing proof to 10 KHz. Admittedly, many of the directional stations could not maintain 10 KHz through the phasors and the high end got trashed at night but the old allocation systems generally kept first adjacent situations far enough apart that 10 KHz could be obtained on groundwave during the daytime. In the day most receivers would start to roll off somewhere around 6 KHz and the better ones had a 10 KHz notch for nighttime conditions. Given the DSP demodulation in the K3, it's a shame that there isn't an offset option to do vestigial sideband demodulation (offset the AM filter to the upper sideband or lower sideband) and demodulate carrier and one sideband for better fidelity. This would work quite well if the carrier were placed at the -6dB point on the composite filter passband since it would keep the proper ratio between carrier and sideband. Alternatively, the carrier could be moved to 1 KHz from the -6 dB point and the DSP could equalize out the 6 dB boost in audio below 1 KHz from the opposite sideband. 73, ... Joe, W4TV -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Alan Bloom Sent: Sunday, January 13, 2008 10:48 PM To: David Woolley Cc: elecraft@mailman.qth.net Subject: Re: [Elecraft] New K3 SN#207 built but question on AM Filter On Sun, 2008-01-13 at 02:49, David Woolley wrote: Paul Webb wrote: ... The basic reason has already been explained, however, there are very few cases were exceeding 3kHz audio bandwidth is useful. HF broadcast stations use 5kHz channelling, which would only allow them 2.5kHz with brick wall filtering at both transmit and receive ends, although they probably do expect to suffer significant adjacent channel interference. MF broadcast stations use 9kHz channelling in Europe and 10kHz in the USA, but I suspect that adjacent channel interference is less acceptable. As they were designed to be received with LC IF filters, with poor shape factors, I suspect they don't even make use of the full channel, and if they did, they would probably be required to have filters which put the adjacent channel into the filter stop band. Even with the 10 kHz channel spacing used in the USA, AM broadcast stations do not have 5 kHz audio bandwidth. The FCC requires a guard band between stations. As I recall, rgulations require that the audio start to drop off at about 4 kHz so that it can be down 20 dB or so by 6 kHz (the passband edge of the adjacent station). So there's not much point in the receiver audio being wider than 4 kHz. Al N1AL ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K2/100 - Power investigation
Dave, I cannot really give you a quick positive answer - the real answer is it all depends. To give a positive answer would require that you operate into a dummy load which is 50 ohms non-reactive at all frequencies in question. One can measure the dummy load with an antenna analyzer - expect to see 50 + j0 at all frequencies of interest for reliable and repeatable results. I do not generally trust any wattmeter (including an uncalibrated Bird) to provide any greater than 20% of full scale accuracy. If the full scale reading is 100 watts, then the error can be as great as 20 watts at any point on its scale. A properly calibrated KPA100 wattmeter can do better than that. I find that with a good 50 ohm dummy load and an 100 MHz oscilloscope with a 10X probe (probe rated for 100 MHz), I can calibrate the KPA100 wattmeter to less than 5% accuracy on bands below 20 meters - at higher frequencies, the 'scope and probe rolloff will indicate lower than expected results. But I can state that once calibrated, the KPA100 power calibration can be trusted to greater accuracy than the run-of-the-mill wattmeters. Using a good 50 ohm non-reactive dummy load and measuring the RF voltage across it: At 4 watts, the Peak to Peak RF voltage will be 40 volts. At 10 watts the p-p RF voltage will be 63.25 volts At 40 watts, the p-p RF voltage will be 126.5 volts At 100 watts, the p-p RF voltage will be 200 volts. My dummy load is a heat-sinked Caddock MP9100-50.0-1% resistor rated at 100 watts with zero length leads that has been measured flat at 50 ohms up to 60 MHz. Up to the frequency limits of my oscilloscope, I trust my dummy load and the peak to peak voltage measurement to provide more accurate power measurement than any wattmeter available. I find that, after calibrating with these tools, the typical KPA100 power indications are within 5% of the actual power output. I can also say that the TelePost LP-200 (and I assume the LP100) will also produce power readings which are within 5% of the actual power after proper calibration. I cannot make such statements about the accuracy of the more common wattmeters which spec their accuracy as a percentage of the full scale reading. A Bird with a 100 watt slug that has been recently calibrated will have an accuracy of 5% of full scale, which is a 5 watt error anywhere on the scale - so a recently calibrated Bird with a 100 watt slug will indicate anywhere between 5 watts and 15 watts for an actual power of 10 watts. One can do better with a precision 50 ohm load and a 100 MHz oscilloscope. OK, that is my wattmeter rant for this month!!! 73, Don W3FPR David Wilburn wrote: After trying unsuccessfully to get email to take data in tabs, I ended up just putting the information on my website. Sorry for the trouble. I was playing with an assortment of power meters, and noticed my K2 was reading lower than I expected. The closes things I had to a gauge, was an IC-703+ that had just been to the shop, and repaired, thus I felt it was likely to be putting out 10w. When I compared a Bird 43 with an element I picked up on line, and one that came with it, it read a bit low. But when I used an MFJ949e, it was right on. Gotta run with what I have. So I checked out the K2/100 at what it said was 10w/53w/111w (Full Power). And I got the results, that are displayed here; http://www.k4dgw.com/k2.html The 10w settings seem a little bit more dispersed than I would have thought. The 10m, 12m 20m 53w settings seem a bit low. Then at what the rig says is 111w/Full Power, the rig seems even lower. Do I need to go back through and run the power calibration, or should I start troubleshooting? I have a KAT100, that was powered down, and the power was taken out of the back of the K2/100. ___ 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 CW Net Report for January 13th 14th, 2008
Good Evening, Both nets this evening were well attended. So well, in fact, that it was difficult to hear beyond the wall of sound. Thus the later calls were worked first simply because I could make out a letter or two! I truly hear a solid tone with no modulation so there is no way I can copy anything. It is gratifying and frustrating at the same time :) There were also a number of folks who disappeared as I called them. I know I heard BEH three times but never got a response. There was a 9V but Mike was worked later by Tom. JP got called but no response from Steve either. Another was OP, of whom I have no clue. I read the sun was acting up and between nets read about aurora in Scandinavia. Thus our conditions seem to have improved through the action of the sun. Now that we are starting upward again that will occur more frequently. I am glad of that since working through the very bottom of the cycle was getting tiring! The weather was wonderful today. I got recharged by seeing the sun and feeling a warm day. It got to near 50 degrees and most of the snow has vanished. Only in the shade is there a little over four inches. Now to get a little cutting in while the weather is good for it. I like to be ahead of the woodpile in case there is a cold snap later in the season. Plus I have to burn a little wood each month of the year. During the summer I can go a few weeks without heat but usually have at least one or two fires a month during July and August. June is normally cold here so having fires is normal. The valley people think I am a little strange. But, then, they live where they can see and hear their neighbors; how odd! On to the lists = On 14049.25 kHz at 2300z: K9DMV - Joe - IL - K2 - 5628 K5BGB - Rod - TX - K2 - 1126 W6ZH - Pete - CA - K2 - 5138 W0RSR - Mike - CO - K1 - 2320 W6SU - John - CA - K2 - 228QNI #5 W0CZ - Ken - ND - K2 - 1031 W0JFR - John - CO - K2 - 4507 W6JD - Doug - CA - K2 - 1626 N0SS - Tom - MO - K3 - 008 K9ZTV - Kent - MO - K3 - 0021 K7TQ - Randy - ID - K2 - 213 KS7D - Mike - FL - K3 - 118 AB9V - Mike - IN - K2 - 3993 KL7CW - Rick - AK - KX1 - 798 On 7045 kHz at 0100z: W0JFR - John - CO - K2 - 4507 W6ZH - Pete - CA - K2 - 5138 W0RSR - Mike - CO - K1 - 2320 N0SS - Tom - MO - K3 - 008 KL7CW - Rick - AK - KX1 - 798* QNI #110 * W0CZ - Ken - ND - K2 - 1031 N7KRT - Jeff - NV - K2 - 5471 QNI #40!!! K9ZTV - Kent - MO - K3 - 0021 K1THP - Dave - CT - K2 - 3942 W6SU - John - CA - K2 - 228 N2YC - John - NY - K2 - 5949 K7TQ - Randy - ID - K2 - 213 K7CN - Mike - NH (?) - K2 - 5569 KS7D - Mike - FL - K3 - 118 AE6GC - Jack - CA - KX1 - 1403 K9DMV - Joe - IL - K2 - 5628 QNI #15!! WL7WH - Bob - AK Now that the moon has set and the sky has cleared I am going to find Comet Holmes (near Algol). This is the longest I have ever been able to see a comet! The sky was hazy earlier but the moon was up so it would not have been easy to find a comet anyway. Now I'll get the chance. Hopefully I got all the information correct. I do have a question about K7CN though: New Hampshire or Oregon? The signal would have sounded much the same to me here so I cannot tell. I think I got everyone's serial number correct since a few of you were running different rigs than normal. Then there was Pete running QRP on his K2 to keep me on my toes. The signal from him was excellent so copy was no problem whatsoever. The duct to Alaska was as good as ever with Rick bringing along another to join us. Please stay warm and safe so I can hear you all again next week, 73, Kevin. KD5ONS (Net Control Operator 5th Class) ___ 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 CW Net Report for January 13th 14th, 2008
Kevin Rock wrote: I read the sun was acting up and between nets read about aurora in Scandinavia. Thus our conditions seem to have improved through the action of the sun. Now that we are starting upward again that will occur more frequently. I am glad of that since working through the very bottom of the cycle was getting tiring! Last week's sunspot from the next cycle does indeed show the start of the next cycle, but you won't see any real improvement until 2010 at the earliest, maybe later. That was a single spot, later ones were still from the last cycle. The sunspot number at the moment is zero, conditions basically flat, yesterday's disturbance not caused by spots at all. Any feeling that you had good conditions was just in the mind... 73 Dave G3YMC -- View this message in context: http://www.nabble.com/Elecraft-CW-Net-Report-for-January-13th---14th%2C-2008-tp14796062p14796484.html Sent from the Elecraft mailing list archive at Nabble.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
