Igor Sokolov escribió: > Is this about 3rd order inband IMD? The subject was widely discussed > some time ago. Just try to search the archaive.
Many information there, thanks http://www.cliftonlaboratories.com/elecraft_k3_receive_audio.htm#Introduction_and_Test_Setup_ This is very interesting, but I have not found IMD measurements made with very closed test sigs. 73, Ramiro. EA4NZ > > 73, Igor UA9DC > ----- Original Message ----- From: "Ramiro Aceves" <[email protected]> > To: <[email protected]> > Sent: Tuesday, November 23, 2010 3:20 PM > Subject: [Elecraft] K3 RX spurs > > > 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 > ______________________________________________________________ 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
