There is also a tech note on the top Ten web site about dealing with hum.
Mouser has inexpensive small audio iso transformers that have less loss
than Radio Shax.
73, Pete N4ZR
At 04:04 PM 3/17/2005, Rob K6RB wrote:
>Had the same problem with two FT-1000Ds and a DX Doubler. For some reason -
>never did figure it out - when the two radios are connected to the Doubler,
>there is an inordinate amount of hum in the Heil Pro Set phones. I tried
>tracing the wires, thinking there might be a misplaced ground in the Doubler
>cables, but found nothing. Even with the Doubler off, and the power removed,
>the hum was there. I finally eliminated most of it by buying 1:1 audio
>transformers at Radio Shack, and isolating the audio lines from the D's to
>the Doubler. There is some attenuation of the audio as a result, but the hum
>is now gone for all practical purposes. It is evidently an issue with the
>Yaesu, because I used the Doubler with a D and an IC-751A, and the Icom's
>audio was hum free! Hope that helps.
>
>Rob K6RB
>
>
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