[Elecraft] K3 RX spurs

[Graham Kimbell G3TCT]

Ramiro
I don't see any difference here between USB, CW and Data.  Third order 
products are about 45-50dB down here, whereas yours seem to be about 
20dB down (difficult to see on the spectrum though).  Maybe your sound 
card input is being over-driven?

Graham

On 19:59, Ramiro Aceves wrote:
> 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.
>