[Icom] New IC-756Pro Problem

[Chris BONDE]

Don:
I moved from a Yeasu switcher to the Astron RS20m, to avoid the spikes in 
160m and lower 80m.  It has a transformer hum.

I put a piece of fibre board, Ten-test I think the brand name.  You can use 
it for a tack board.  Similar to the ceiling tiles except not painted 
white.  It absorbes most of the hum so that it is not noticeable.  Remember 
that most of the hum heard could be from resonating through the rubber 
(hardened?) feet.  Try placing a piece of sound absorbing material under 
it, and donot let the sides, back with wires etc touch any hard stuff of 
the desk, etc.

Just a thought.

Chris opr  VE7HCB



At 03:09 PM 2002-03-28 -0500, you wrote:
>Paul:
>I use a Astron SS-30M as my main station power supply.  I have 2 HF Rigs and
>one is a IC-756 PRO. Iv owned 4 new Astron RS-35M supply's over the past
>10-12 years and every one of the Astron RS-35's have had transformer core
>hum.  It will drive you nuts!  I could hear the transformer hum 5 feet away.
>I finally tried the Astron SS-30M.  It's a super quite supply except for
>some fan noise when the fan cycles.  I have a easy mod that will help reduce
>the fan noise problem in the SS-25M or SS-30M.  It can be found at
>www.e-ham.net/home under Product Reviews / Power Supplies
>
>73's Don / WA9TGT