Topband: control voltage noise in K9AY loop
pbaldock at verizon.net
Wed Oct 10 21:33:14 EDT 2007
At 02:39 PM 10/10/2007, you wrote:
>The problem is that I have serious hum modulation in each of the powered
>positions of the direction switch (+/- 24 DC and 24 AC).
I had the same problem, but only with +/-12V but not with 12V AC. I
solved it by using an isolation style 9:1 transformer rather than the
auto-transformer. I let the input side of the transformer and relays
float from ground out at the antenna.
Also I put .022uF on the output the halfwave rectified signals back
at the shack, because those signals can have pretty fast edges at
That should fix it.
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