[Yaesu] 990 'feedback' w/12 V supply

[Bill Morris Denton]

I'm not sure I have the same problem, but I also hear my distorted voice in 
the speaker and also in headphones but not as loud. I don't have an ac supply.
It is the DC model. Mine is about a month old and it WAS a problem on 
sweepstakes.  Ive mostly operated it on cw contest. This was the first 
serious 
ssb it's done but I did noticed it before in some casual qso's. I also 
disconnected all the external connections with the exception of the 
DVS-2. At one point it was real loud and also was getting distorted audio 
reports.  My problem could be different. I thought it was rf getting 
into the aduio.  I use several ladder line fed antenns through tuners.
Don't have that problem with the TS-830's 
Boy I love that radio.  Still hve one.

Bill Denton WA5DWX.

On Mon, 18 Nov 1996, Brian Smithson wrote:

> I've always been running my 990 off the AC line until a few weeks ago when I
> hooked it up to my 40A power supply to see if that would help with some
> computer interference I was experiencing. It didn't, but I left it on the PS
> for grins. All has been well until this weekend.
> 
> Sunday, I was casually operating sweepstakes and I noticed that I could hear
> my own voice distored through the headphones when I transmitted. At first I
> suspected my 15m dipole, but it happened on all bands on all my antennas.
> 
> I went backwards in time disconnecting accessories I'd connected, one at a 
> time. The problem didn't go away until I disconnected my power supply and went
> back to using the AC! Reconnecting all the accessories (keyer, external sp.,
> CAT interface) leaving the power from AC still got rid of the feedback.
> 
> Question: Why would a 12V connection cause the 990 to do this? I have three
> other things connected to the power supply: A NIR-12 DSP unit, a KPC-3 (off),
> A Yaesu FT2200 (also off).
> 
> Any ideas?
> 
> Tnx es 73!
> n8wrl
> -Brian
> 
> 
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