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

[Bill NY9H]

Hi Adam,
Guess I was being a little cute with the comment about the second "demod:"..
I do realize about the scheme/.///  cool but not a second rcvr.
At 01:36 PM 8/15/2005, you wrote:

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


Thanks for the comment on the buffer... i did pick up some mar chips 
at dayton, that have about 0.5 gain.,,,,, that might do it. I need to 
find them and re read the data sheet.
tnx

bill


>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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