[ICOM] Smoked PROII

[Gary Nichols]

The only radio I am aware of that does properly protect the RX input during
transmit is the K2

Gary, kd9sv 

-----Original Message-----
From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net] On
Behalf Of JV
Sent: Friday, February 03, 2006 9:32 PM
To: 'ICOM Reflector'
Subject: RE: [ICOM] Smoked PROII

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

 

 
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