[Elecraft] K3 RX spurs

[Ramiro Aceves]

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" <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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