[Cliffdwellers] QRM on HF

[Walter Cang]

I do have a 3 amp power supply which I can probably use just keep the radio on and see if the primary power supply is the culprit.

If that's not the source (I hope), then I'll have to try my AM radio.  I listen to it on another room but never noticed the QRM.  Might be near the radio then?  Only think I can think of is a step up transformer (110 to 220) and a 9v adapter.  

Thanks.

Walter


> -----Original Message-----
> From: J. Coote [mailto:TSCM at jps.net]
> Sent: November 22, 2004 8:41 PM
> To: Walter Cang
> Subject: RE: [Cliffdwellers] QRM on HF
> 
> 
> Keep isolating- one consumer device or appliance at a time,
> with the transceiver on.  Try all devices in the building
> including sheds and garage, security systems, control systems,
> cable TV/DSL, etc.  Or, try shutting off
> circuit breakers one at a time.  If you have a cheap AM portable
> with loop stick antenna, you may be able to home in on it-
> also a cheap portable SW receiver or handheld scanner with SW
> may help locate it.
> Jay
> 
> -----Original Message-----
> From: cliffdwellers-bounces at mailman.qth.net
> [mailto:cliffdwellers-bounces at mailman.qth.net]On Behalf Of Walter Cang
> Sent: Monday, November 22, 2004 11:09 AM
> To: Cliff (E-mail)
> Subject: [Cliffdwellers] QRM on HF
> 
> 
> I had set up a 120' loop antenna on my townhouse attic.  I 
> hooked it up to
> an Icom 751 using a ladderline.  As I scan across each band. 
> I noticed a +9
> tone every few 100 kHz.  Although I am able to tune it out 
> using the notch
> filter, it comes up whenever I scan which means I can't hear 
> anything unless
> I manually tune it out.
> 
> Does anyone know what the cause for this is?  I haven't taken 
> a closer look
> e.g. recording how far apart they are but I know it is 
> present on ALL bands.
> I thought it was my PC but shutting it off didn't make a difference.
> 
> 73!
> 
> Walter  VA3WYC
> 
> 
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