[ICOM] Flickering display - 756 Pro

[WA2BPE]

Likely that RF is getting into either the radio (various routes) or the power
supply.  Single point grounding is good, but not always the whole answer.  I'd
first try ferrites (type 43) on various lines including the coax to the Alpha.
On the subject of keying, I always to isolate things - opto-isolation is ideal
and can help eliminate ground loops, but since this problem is new...

It's interesting that you had no problem for years - something has changed -
grounding, connections, cable routing, neighborhood changes, etc.  Look around
at what's different - including weather possibilities which almost guarantees
an out-of doors connection change.

Tom - WA2BPE

Joe - WDØM wrote:

> Your thoughts??
>
> After having no problems at all for years, this morning when I fired up the
> 756 Pro, Alpha 87a and called a DX station on CW, I noticed that the
> display on the 756 Pro began flickering in sync with the CW keying.  At the
> time, I was running about a KW on the Alpha 87a.  When I backed off on the
> power a bit, the flickering stopped.  I've never seen this problem before,
> and I've run the same combination for years.  The same thing happens,
> regardless of the band while using my SteppIR antenna, or when running 30
> meters or lower on inverted vees/slopers/dipoles.
>
> All equipment is grounded/bonded/single point ground.  I don't have a
> keying relay between the Pro and the Alpha 87a because the 87a easily meets
> the requirements on the relay in the Pro.  Nothing has changed in the
> configuration that I can attribute to this issue.  All I can think of is
> that maybe I SHOULD have a keying relay.....
>
> Anyone seen this happen before??
>
> 73,
> Joe
> WDØM
>
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