K3/s in ARRL CW Test?
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Hi Bill, thanks for the Q and the mention next to VP6DX! 160M is an unusual band for me, I was just using my single 80M vertical, and the K3 of course, only 100W.
Yes I've worked many many stations this weekend in the ARRL CW Test, I'm curious to know how you knew I was using my K3. Do you have some sort of lookup list or auto crosscheck system? I must have worked a few K3/s myself but apart from N1EU (a call I recognise) I don't know who they were, but would like to. Also worked VP6DX on a few bads now, CW and SSB. The K3 is working soo well, thanks Elecraft. 73,Deni F5VJC K2 1188 K3 325 Likewise here operating single band 160 in the contest. I have 306 Qs in 74 countries before our final hour of darkness, including at least two other K3s (VP6DX and F5VJC). I've not heard *any* IMD products the entire weekend and this included Friday night when I operated with the preamp on just to see if I might induce some (before the QRN front then over Texas got unbearable). |
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Pleased to work a few other K3s in the ARRL DX contest. I was very
surprised after answering VE3EY's 40m CQ that he came back telling me that my K3 sounded nice! Thank you Nick! Great Elecraft commaradie... The K3 was superb during the contest especially on 40m with 300 Hz DSP. I am still very impressed by the strong signal handling. I was only running 100W to a stealth (1mm DX-Wire) 40/80m trapped Inverted L at 24 feet. The K3 mojo is alive. I was pleased to work VP6DX on 40m CW on Sunday using my stealth setup. Great operators there (with great radios). 73 de Rich, G4ZFE K3 #128 _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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My K3 #145 was used casually in ARRL DX this weekend. One thing that really impressed me was when an extremely strong carrier appeared on top of K1TTT just as I was about to call - and stayed there. I turned on the manual notch and tuned it onto the carrier and lo and behold K1TTT re-appeared and was worked. Obviously not *exactly* on the same frequency but near enough to prevent any copy even with the 250Hz roofing filter in and DSP right down to 50Hz; the notch on the K3 is so sharp it's almost unbelievable.
73, Stewart Rolfe, GW0ETF
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My K3 was on 40M and for 6 QSOs on 10M from K1RX. We initially had
an interstation interference problem with the 80M station. It was causing pops and strange behavior with the AGC. We tried to manage it with antenna orientation and judicious frequency use, but it didn't seem to help. I checked out the AGC settings on the K3 and found that the AGC PLS menu item was set to OFF. I changed it to NOR, which by virtue of the label should have been the normal setting. Not sure how that got set to off, but it made a huge difference. Checking the manual, it was to enable (or actually disable) the AGC from acting on impulse noise. These impulses were coming from 80M and affecting 40M. (We later changed out the 80M amp which probably was causing some of the problem.) The situation became much better after this change, however, the first few hours of the contest had a lower than expected rate on 40M. We started out as M/2 (switched to MM after we didn't want to deal with the band change limit) so we just went to another band more than we should have. At 2/18/2008 06:16 AM, GW0ETF wrote: >My K3 #145 was used casually in ARRL DX this weekend. One thing that really >impressed me was when an extremely strong carrier appeared on top of K1TTT >just as I was about to call - and stayed there. I turned on the manual notch >and tuned it onto the carrier and lo and behold K1TTT re-appeared and was >worked. Obviously not *exactly* on the same frequency but near enough to >prevent any copy even with the 250Hz roofing filter in and DSP right down >to 50Hz; the notch on the K3 is so sharp it's almost unbelievable. > >73, > >Stewart Rolfe, GW0ETF > > >g4zfe wrote: > > > > Pleased to work a few other K3s in the ARRL DX contest. I was very > > surprised after answering VE3EY's 40m CQ that he came back telling me > > that my K3 sounded nice! Thank you Nick! Great Elecraft commaradie... > > > > The K3 was superb during the contest especially on 40m with 300 Hz > > DSP. I am still very impressed by the strong signal handling. I was > > only running 100W to a stealth (1mm DX-Wire) 40/80m trapped Inverted L > > at 24 feet. > > > > The K3 mojo is alive. I was pleased to work VP6DX on 40m CW on Sunday > > using my stealth setup. Great operators there (with great radios). > > > > 73 de Rich, G4ZFE > > > > K3 #128 > > > > _______________________________________________ > > Elecraft mailing list > > Post to: [hidden email] > > 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/K3-s-in-ARRL-CW-Test--tp15538850p15542920.html >Sent from the Elecraft mailing list archive at Nabble.com. > >_______________________________________________ >Elecraft mailing list >Post to: [hidden email] >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: [hidden email] 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 |
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In reply to this post by GW0ETF
Stewart I haven't found the Manual CW Notch to be very useful. Are you sure the carrier did not actually disappear rather than the notch removing it? Here are some measurements using the XG1 at 50 uV as a source and the K3's internal dBV meter (AGC off for valid measurements). At 100 Hz offset (XFIL, Width, Pitch, Notch all = 500), the interfering signal was approximately -12 dB down. At 100 Hz offset (XFIL=200, Pitch & Notch = 500, DSP settings as shown) the interfering signal was: DSP=200, interfering signal -12 dB down DSP=150, " " -32 dB " DSP=100, " " -54 dB " DSP=050, " " -57 dB " I conclude CW Notch is nowhere near as effective as the DSP settings of 150 and lower. An additional problem is that the Notch is inside the DSP's AGC loop, so the K3 is still desensed by the presence of the carrier, even though it may not be present in the audio. On-frequency the Notch has ~55 dB of rejection which is excellent, but of course that also notches out the desired signal the same amount. I did these measurements hastily and could have made some errors, but they agree with my first impression that the CW Manual Notch is not too useful. It's a little difficult to use since you must guess its tone and the 20 Hz setting granularity is higher than I'm accustomed to. Orion had 10 Hz granularity in setting the tone and also offered a range of notch bandwidths from 10 Hz and up (going from memory since I no longer have it to compare). 73, Bill W4ZV |
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