KRX3 in action
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good morning,
the KRX3 arrived and I installed it yesterday. After doing the VCO calibration and filter settings it is working fine. I have observed two things that are not clear to me so I wanted to ask if this is the same at your K3's. When I switch SUB on and I have the antenna shared between the main RX and the sub RX and both are exactly on the same frequency I can hear a strange "stereo" sound in the headphones. It sounds like the signal is moving in my head from left to right. It reminds me to a zero beat at about 1 hz. Is this normal? Second: I have a relative strong birdy (S3-4) at 7120 khz which is microfoning when I tap on the K3. It is only present in USB! There is another one with lower intensity (S1) at 14.185 - no microfoning when I tap. The birdy on 6m that I had befor I added the KRX3 has disappeared completely here. 73! de Werner OE9FWV -- You cannot kill time without injuring eternity.-- Thoreau Email powered by Pegasus Mail free at <http://www.pmail.com> Homepage: <http://www.qsl.net/oe9fwv/> Fone +43 5522 75013 Fax +43 820 555 85 2621 Mobile +43 664 6340014 Elecraft K2 #5203 K3 #656 _______________________________________________ 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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Congratulations.
The frequency offset is perfectly normal. It is related to the synth and any filter offsets. With matched filters it is a very low beat frequency that can be a little disturbing on stronger signals. A greater offset might be better and could aid in detecting weak signals. You could get that my offsetting one of the filters a tad. I found a birdie just below 50.05 MHz while looking for our beacon. It is not too strong. Such things are inevitable unless you want to add 20kg of screening materials. An unlocked birdie might be a spurious oscillation problem. Did you ensure the cables are as far away from the VCO cores as possible? Mike
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In reply to this post by oe9fwv
hi Alexandr,
Alexandr Kobranov schrieb am 26 Sep 2008 um 9:23: > are the birdies dependent on bandwith also? yes they are. I can see them on the Panadapter very easy, and they jump aside when I change XFIL: > I have had similar problem with ma K3 base unit and replacing of RX > mixer - small board, the same applied in KRX3 solved this. ok I'll try this. > So my recommendation - swap RX mixer boards between base and KRX3 and > compare results. I is what I will try is this case. I get the loudest birdie when I touch the relay or toroid on the K3SYN. > About sound main/sub - what is used XFIL? if 5 poles what is offset > differenciies? I switched the filters in the main and sub receiver but it did not change this sound. I think it could be a AGC effect. I have the feeling that with AGC off the effect is less. > If 5 poles, try to little bit change offset for one of them and compare. this did not change anything. It has to do with AGC I think. > I have my KRX3 just on USPS so not able to test here directly. I am vy interested what you find when you have it installed! I found another anomality: if sub rx and main rx are linked together, this does not affect the coarse tuning with the RIT knob. Only the main VFO is tuned and you have to press A>B to have the two VFO's on the same frequency again. Maybe it is intended? 73! de Werner OE9FWV -- Reality is for people who lack imagination. Email powered by Pegasus Mail free at <http://www.pmail.com> Homepage: <http://www.qsl.net/oe9fwv/> Fone +43 5522 75013 Fax +43 820 555 85 2621 Mobile +43 664 6340014 Elecraft K2 #5203 K3 #656 _______________________________________________ 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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