[ICOM] 756ProII & III 2nd RECEIVE ANTENNA OUT

[Adam Farson]

Hi Bill,
Actually, there is no second demodulator in the 756Pro series. The DSP does
all demodulation tasks, and there is only one DSP.

You would be best off building up a little buffer circuit.  You can connect
the buffer input to the CTRL Unit/J2 - RF-A Unit/J101 jumper, and the output
to your RX RF output BNC socket. This will prevent double-termination of the
50-ohm RF input to the front end.

As long as the K2 can never accidentally transmit into your added RF port,
there should not be any risk of damage. 

Cheers for now, 73,
Adam VA7OJ/AB4OJ


-----Original Message-----
From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net] On
Behalf Of Bill NY9H
Sent: 15 August 2005 11:08
To: ICOM Reflector
Subject: Re: [ICOM] 756ProII & III 2nd RECEIVE ANTENNA OUT

While I am getting used to the "second" demodulator ( receiver) in the 756p2
; i still wanted a second receiver available to see the antenna selected to
the main set. I had done this also on my 
Omni6+.  I built a little jumper cable, for  T connection to my k2. I
replaced the jumper on the pro2 with the jumper which also has a line to a
bnc on the back.  the jumper is from control unit J2 (rfrx) to
J101 (rx)on the RFA unit. I believe it to be safe for the ICOM...as it looks
to be capacitively isolated from the icom's active stuff. 
While i understand it will be lossy, am i missing something else as to the
safety to the rig ???

I feed it to the aux receive antenna input on the K2 so that can't blow it
up.

bill

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