[Yaesu] FT-990 RX Antenna Feedback Problem

[Larry Menzel]

Ron,

1.  You don't mention if you have a grounding circuit on your RX antenna.
Never use your 
receive antenna port without a device to ground your 
receive antenna while transmitting...YOU CAN RUIN THE FRONT END OF YOUR RIG. 
I suggest the Front End Saver.

2.  I suspect that you are seeing some RF feedback from the receive antenna
and
it's coming back through the keying circuit to the linear.  Again, this, I
think
would stop if your RX antenna were grounded.

3.  Front End Saver avaliable from C&S Electronics, Fort Wayne, Indiana.
About $50.
At 09:34 AM 1/24/98 -0500, Ron E. Schuster wrote:
>I am running a beverage antenna on 160 to receive.  I am plugging it into
>the RX IN jack.  Only when I have the RX antenna ON and am using an AL-80A
>linear, I get a moderate feedback/oscillation in the linear.  Anyone have
>any ideas?
>
>
>
>Ron Schuster  (N9RC)
>Cincinnati, OH
>rschuste@one.net
>http://w3.one.net/~rschuste
>
>
>
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