[ICOM] Smoked PROII

[JV]

Adam
    You mean to tell me that Icom didn't have the intelligence to put a
relay switch in the receive antenna circuit. To con a phrase "What in the
#$%& were they thinking"!!! I guess my 756pro is the same way.
JV 
 
-------Original Message-------
 
Subject: RE: [ICOM] Smoked PROII
 
Hi Zig,
 
Sadly, I can confirm this. The transmitting antenna can induce a signal in
the receive antenna which is sufficiently strong to damage components in the
input circuit of the Pro2 front end - in particular, varistor R112 and fuse
DS111 in the RF-A Unit.
 
The KD9SV Front-End Saver is a handy and inexpensive accessory which
switches the receive antenna and the RX-ANT port to ground, and extends a
ground to an amplifier keying line, during transmit. One could also wire up
a DPDT relay to connect the receive antenna to the RX-ANT input on receive,
and break this path on transmit by shunting both the antenna and the RX-ANT
input to ground.
 
Cheers for now, 73,
Adam VA7OJ/AB4OJ