[Elecraft] Noise on 160m

Tue Nov 26 03:39:01 2002

Sverre,

>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

Don't keep us in suspense . . . brand and model????  Help the rest of us!!  

73 es gl,
Dave
AB9CA

At 09:25 AM 11/26/02 +0100, Sverre Holm - LA3ZA wrote:
>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
>> 
>> 
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>> 
>
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