[Elecraft] Noise on 160m

Tue Nov 26 03:26:01 2002

Thanks to those who responded to my question. 

It turned out that the noise source was sitting right under my desk - a
little embarassing perhaps, but it is a switching power supply! With a
battery, the noise goes from S9++ to S1-2 in day-time on 160 m

73
Sverre LA3ZA

> -----Original Message-----
> From: [email protected] 
> [mailto:[email protected]] On Behalf Of Sverre 
> Holm - LA3ZA
> Sent: 24. november 2002 20:43
> To: [email protected]
> Subject: [Elecraft] Noise in K2 on 160m
> 
> 
> My CQ WW contest time is over - that is I was only after the 
> DX and as darkness has come 20, 15 and 10 meter have more or 
> less closed.
> 
> Much to my surprise I was also able to work some stations on 
> 160m tonight. The antenna is a 75 m horizontal loop with a 
> 4:1 W1CG balun, and I know this is not supposed to be very 
> good for 160 m, but anyway I worked OZ, GM and G. This is the 
> first time ever that I have worked 160 m. 
> 
> I notice that the band is very noisy, but my K2 behaves in a 
> strange way as I have to work it with the Attenuator on and 
> RF gain in the 10 or 11 o'clock position to get rid of a kind 
> of noise that makes it almost impossible to copy anything. 
> The Noise Blanker makes it a little bit easier, otherwise the 
> RF gain has to be turned down even more. The noise seems to 
> come as the RF gain crosses a threshold and then it will 
> distort the received CW also. To me it seems like some sort 
> of overload or oscillation in the RF/IF part of the receiver. 
> I have also noticed this kind of behavior on 80 m from time to time.
> 
> Any clues about what this can be?
> 
> Sverre Holm, LA3ZA
> ------------------
> www.qsl.net/la3za
> 
> 
> _______________________________________________
> Elecraft mailing list: [email protected]
> You must be a list member to post to the list. 
> Postings must be plain text (no HTML or attachments). 
> See: http://mailman.qth.net/mailman/listinfo/elecraft
> Elecraft Web Page: http://www.elecraft.com
> 
> 