[TenTec] Orion 28 Mhz noise SOLVED

[Duane Calvin]

Interesting - I got a nice "buzzing" on mine on 10m starting around 28.100
or so and going up through the top end of the band.  It was also from a
cheapo "y" cable run from +13.8VDC on the back to the fan and to the light
on my 238B tuner.  I found if I unplugged the tuner, the noise went away, so
it sounds like the "Y" cables on the power can give some grief.  I thought
it was partially a ground loop that was somehow propagating noise from the
fan motor since it seemed to follow the fan RPM in tone.

	73,  Duane

Duane Calvin, AC5AA
Austin, Texas
www.ac5aa.com  
 

-----Original Message-----
From: tentec-bounces at contesting.com [mailto:tentec-bounces at contesting.com]
On Behalf Of bob finger
Sent: Friday, October 20, 2006 10:37 AM
To: tentec at contesting.com; orion565 at yahoogroups.com
Subject: Re: [TenTec] Orion 28 Mhz noise SOLVED

Problem solved.  It was a rat shack Y cable attached to the +13 volt 
jack on the back of the Orion.  I had the heatsink fan powered thru the 
Y, with the other end unused.  Removing the Y cable and powering the fan 
directly from the +13 volt jack is fine.  Thanks so much to Hank for the 
suggestion.  73 bob de w9ge

bob finger wrote:

> My Orion has decided to generate some noise on ten meters. 


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