Good troubleshooting!!
Tom - W4BQF
----- Original Message -----
From: "Duane A Calvin" <ac5aa@juno.com>
To: <tentec@contesting.com>
Sent: Monday, June 28, 2004 10:06 AM
Subject: [TenTec] Orion with 10m "buzz" (solved)
> I was disheartened last week to find a "buzzing" noise in my otherwise
> perfect Orion starting in the 10m SSB frequencies and continuing all the
> way up the band. Both RX's, happens with antennas connected or
> disconnected or even deselected. This weekend I started pulling cables
> to eliminate possible problem areas. Imagine my surprise as I pulled the
> RCA plug out of the +13.8 V jack in the back and the buzz stopped! What
> was it? It appears to be a cheap "Y" cable that I used to power both the
> #310 cooling fan and the light in the 238B tuner. If I plug just the fan
> without the "Y", no noise. Same for the tuner. If I plug just the fan
> through the Y cable, the noise returns, and is originating in the fan
> (noise follows the fan spin-up when power is applied, and stops
> immediately when the power is removed.) I plan to build my own cable and
> will probably add some bypassing there that is effective at 28 MHz. Most
> likely no one else will see this problem, but I wanted to post this on
> the off-chance that they do.
>
> 73, Duane
>
>
> Duane Calvin, AC5AA
> Austin, Texas
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