[Elecraft] K3 RX spurs

[Igor Sokolov]

Is this about 3rd order inband IMD? The subject was widely discussed some 
time ago. Just try to search the archaive.

73, Igor UA9DC
----- Original Message ----- 
From: "Ramiro Aceves" <ea1abz at gmail.com>
To: <elecraft at mailman.qth.net>
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.
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