[Elecraft] K3 RX spurs

Ramiro Aceves ea1abz at gmail.com
Tue Nov 23 05:20:57 EST 2010


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.


More information about the Elecraft mailing list