[Elecraft] K3 RX spurs

[Igor Sokolov]

Ramiro, the in band IMD subject was discussed here on this reflector as 
well.
Here is the link 
http://mailman.qth.net/pipermail/elecraft/2008-November/099616.html

73, Igor UA9CDC

----- Original Message ----- 
From: "Ramiro Aceves" <ea1abz at gmail.com>
To: "Igor Sokolov" <ua9cdc at gmail.com>
Cc: <elecraft at mailman.qth.net>
Sent: Tuesday, November 23, 2010 5:55 PM
Subject: Re: [Elecraft] K3 RX spurs


> 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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>