Sounds like common mode RF on the feedline is triggering the over-
voltage protect (crowbar) in the power supply. Were you on a
different frequency/band than normal?
Best thing you can do is install a common mode choke - see the info
in the first article here: http://www.audiosystemsgroup.com/publish.htm
Also read the articles on "Transmitting chokes."
73,
... Joe, W4TV
On 7/10/2013 11:32 PM, Michael Tortorella wrote:
Hi all, using an FT890 with Astron SS-30M supply and DX Lab Suite.
Receives FB but the instant I hit the key, the xcvr shuts off, the
supply voltage goes down to 3 volts. Turn everything off, restart, same
deal: receives FB, as soon as I hit the key, the xcvr shuts off and
supply goes to 3V. At first I thought it was RF getting into the supply
so I separated the two by a couple feet and this _seemed_ to help. But
tonight the problem is back fully.
This first happened two days ago. Then last night everything was
fine,
worked several stations OK. Tonight, problem. Has anyone seen anything
like this before? Any advice greatly appreciated.
Thanks and 73
Mike W2IY
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