BTW -- even with all my choking, the noise is still increasing 6dB on 6M
when I turn on the controller!
73, Jim K9YC
On 3/9/2011 2:58 PM, Joe Subich, W4TV wrote:
> 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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