The Orion II operator's manual warns against using a "Y" cable for this
purpose (running the cooling fan and tuner light from the same source) for
the reason (ground loop) you describe.
-----Original Message-----
From: tentec-bounces@contesting.com [mailto:tentec-bounces@contesting.com]
On Behalf Of Duane Calvin
Sent: Friday, October 20, 2006 7:59 PM
To: 'Discussion of Ten-Tec Equipment'
Subject: Re: [TenTec] Orion 28 Mhz noise SOLVED
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@contesting.com [mailto:tentec-bounces@contesting.com]
On Behalf Of bob finger
Sent: Friday, October 20, 2006 10:37 AM
To: tentec@contesting.com; orion565@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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