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

[Adam Farson]

Hi Bill,

Dual Watch  is actually a neat compromise solution which is quite adequate
if both signals are in the same mode and the same or adjacent bands.

http://www.qsl.net/ab4oj/icom/dw.html

I use Dual Watch mainly for monitoring the distant station's listening
frequency when working split, or for guarding a frequency for a call whilst
operating on another frequency in the same band, or in a nearby band.
(Typically, it is 20m and 17m). The inability to mix modes is not a serious
disadvantage for me, as I operate 99.5% SSB.

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 16:54
To: ICOM Reflector
Subject: RE: [ICOM] 756ProII & III 2nd RECEIVE ANTENNA OUT

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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