[Flexradio] 40m QRM

[David Beumer WA3FDB]

Ahti

Thank you, I hadn't thought of the UPS.. 

-----Original Message-----
From: Ahti Aintila [mailto:oh2rz.sdr at gmail.com] 
Sent: Friday, November 28, 2008 10:46 PM
To: David Beumer W0DHB
Cc: flexradio at flex-radio.biz
Subject: Re: [Flexradio] 40m QRM

David,
If you are using any UPS equipment or any other switched mode power
supplies, try to switch them off.

Ahti OH2RZ

On 29/11/2008, David Beumer W0DHB <wa3fdb at beumerfamily.com> wrote:
> Folks
>
>
>
> I'm trying to track down the source of some nasty QRM that appears as 
> an 4khz wide carrier that meanders through 40m with 2nd ,3rd and 4th 
> harmonics on 20, 15 and 10.  I've got a screen shot of waterfalls of 
> 40m (Top) and
> 20m(bottom) showing the signal at URL:  www.wa3fdb.net/40mQRM.htm
>
>
>
> I'd appreciate any clues as to what it is .. I don't believe it is
anything
> internal to the 5000A    .
>
>
>
> It is strong enough on 20 m that it prevents digital mode reception.
>
>
>
> I'm located about 40 miles NNW of Denver, grid DN70kc .
>
>
>
> I'm also checking with folks in a 10 mile radius or so to see if they 
> can hear and/or see it.
>
>
>
> Thanks
>
> Dave - W0DHB
>
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