[Elecraft] K3 bandpass shift - cw mode
All of a sudden I can not shift the center frequency of the bandpass on my K3. When I turn the knob it reads the proper center frequency (spot pitch), but I can not change it. Any suggestions? 73, John/K8AZT __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K3 spurious radiation?
Thank you to all who have taken the time to respond to my question regarding possible false spots by the skimmer receivers used for reporting on reversebeacon web site. I appreciate all the responses. 73, John/K8AZT __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] K3 spurious radiation?
I have not been monitoring this mail list much recently so I apologize if this subject has been discussed previously. I like to monitor the reversebeacon.net website while calling cq or just monitoring looking for a qso. Recently I have discovered a situation which has me puzzled and I am hoping someone here might be able to give me some insight what might be happening. When calling cq (CW) on 7.0 MHz cw, I see several hits on the reverse beacon website on 7.0 MHz, however I have also seen a couple stations allegedly hearing me on 10.1 MHz (2 occurrences) and a station hearing me on 28 MHz bands (1 occurrence). I am hoping this is a problem with the skimmers, but want to check out if there is anything which might not be right with my K3 and/or antenna which might be generating unwanted radiations. At the moment I do not have exact frequencies where I was being monitored. I just thought someone might have a suggestion where do I proceed. At the moment I do not have access to a frequency analyzer, but hope I can find one to borrow locally. Thank you for any suggestions/comments anyone in the reflector might have. 73, John/K8AZT K3/ SN 1693 __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] K3 spurious radiation?
Thank you Tom, Geof, and Eduardo for responding. I feel a bit better that I am not alone experiencing this situation, however want to prove it is not from my rig. I started wondering since the skimmer rx's are sdr's, this might have something to do with digital sampling aliasing. If the ADC's don't have sufficient anti-aliasing filters, strange results can result from not sampling at a sufficiently high frequency. I wonder what the sampling frequencies are for the sdr's used? Something more for me to research. Again, Tnx all for the input. 73, John/K8AZT __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] K3 shutdown
My K3 sn1693 has just started exhibiting a troubling problem. Operation in CW when I put key down, the rig shuts off completely. When turning back on, it forgets frequency that was set just prior to shut down. I thought this might be rf in shack, so tried with dummy load and same problem. Any suggestions or has anyone else experienced this behavior? 73, John/K8AZT __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] Test message
This is test message. Please ignore. John/K8AZT __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] Elecraft mail list test message
This is a test message to verify posting to the list. 73, John/K8AZT __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] K3-s/n1693 test message
This is test message. 73, John/k8azt __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] K3 s/n 1693
I have found something in the operation of the digital bandpass filters I don't quite understand and hope someone will be able to set me straight. When listening to a CW signal, the bandwidth is narrowed. I have a 2.7 kHz and 400 Hz roofing filters installed. As I narrow the bandpass with the digital filter, the background noise heard is less as is expected and the signal loudness heard through speaker and/or headphones remains the same. This happens until the digital filter bandwidth gets to 100 Hz. When the bandwidth is changed from 150 Hz to 100 Hz, there is an audible click heard and the loudness of the signal heard is significantly reduced. At 50 Hz bandwidth audio level as at 100 Hz. The audible click noise may not be significant as I do hear this when switching between other bandwidths, but until recently only noticed it when reducing the bandwidth to 400 Hz (switching to 400 Hz roofing filter). The only reason I can think this might be happening is if the width of the transmitted signal is wider than 100 Hz, but this appears to be happening even on unmodulated carriers. Can anyone explain what might be happening? I appreciate any and all explanations. Thank you, John/K8AZT ___ 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
