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Re: [TowerTalk] RFI From SteppIR SDA100 Controller

Subject: Re: [TowerTalk] RFI From SteppIR SDA100 Controller
From: "Joe Subich, W4TV" <>
Date: Wed, 09 Mar 2011 17:58:57 -0500
List-post: <">>

Are you sure it's the controller and not the power supply
("brick")?  The original controller had similar reports -
usually tracked down to the 33V ("high power") switching

I'd suggest checking with Mike or John Mertel at SteppIR
about a replacement power supply.


    ... Joe, W4TV

On 3/9/2011 5:43 PM, Jim Brown wrote:
> I've been chasing a very strong, very elusive set of drifting birdies.
> They were strongest on 12M, but also were present on 15M and 10M.
> Nothing affected them until I unplugged the power supply for the SDA100,
> at which time they went away, and the overall noise on the band dropped
> by at least 10dB.   This crap radiates  into every antenna I've got.
> I've managed to attenuate this crap by at least 20 dB using chokes on
> the cable that runs to the antenna, the rotor cable, and both the 120VAC
> and 33VDC cables from the power supply.
> If you've got an SDA100 (that's the newer, higher voltage controller),
> you might want to check this.  15dB is a LOT!  The best way to see
> what's going on is with a panadapter set pretty wide so that you see
> birdies drifting slowly up and down. I'm using a P3.
> 73, Jim K9YC
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