Ramiro I don't see any difference here between USB, CW and Data. Third order products are about 45-50dB down here, whereas yours seem to be about 20dB down (difficult to see on the spectrum though). Maybe your sound card input is being over-driven?
Graham On 19:59, Ramiro Aceves wrote: > Hello K3 fans > > I am a bit stranged and frustrated cause nobody has answered a single > word to my email "K3 RX spurs" posted on november the 20th. No > comments, no ideas.... > After some tests I have concluded that the spurs are 3rd order > intermodulation products. They only occur in DATA or CW. > ¿Can anyone please, try to reproduce those products in your K3/P3 or > K3/computer combination?. > > "DATA A" mode: Cristal filter= 2.7KHz, SHIFT=1.5 KHz, WIDTH= 2.7 kHz > Tune some steady carrier in shortwave. Tune the signal to place a > beautiful 1000 Hz on the waterfall > Tune your signal generator 10 Hz more than the broadcast carrier > frequency to get an audio signal 10 Hz over the 1000 Hz signal. > Adjust generator strenght to be similar to the broadcast carrier. > > You will see strong beautiful 3rd order products on 1020 and 990 Hz. > Swith to USB--> much more weaker 3rd order products or inexistent. > > http://ea1abz.ure.es/3erd-order.jpeg > > That is my K3 behaviour. Just want to know if my K3 is ok or not. > > Many thanks. I appreciate your effort in doing this test for me. > > 73, Ramiro, EA4NZ. > > PD: Volume at the speaker is zero to avoid vibrations inside the K3 case. > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
