[Icom] IC 746 Relay..for TOM N4TJ

[Larry Benko]

Larry,

Unless the PRO2 is different from the PRO and the original 756, the 
OMR-109F relay operates only the Send Jack (RCA type) on the back of
the radio.  This signal is an output only.  The SEND signal that is
in the DIN connectors (ACC1-pin3 and ACC2-pin3) and the MIC connector
pin5 is both an input and an output.  This lead does go to ground
through a transistor at the same time the the relay closes.  However
actively grounding this lead will put the radio in the transmit mode. 

73,
Larry Benko, W0QE


LARRYN2LH@aol.com wrote:
> 
>  tom,
> 
> a few weeks ago I bought a ic-756 pro 2 and had the same prob. after a few
> seconds trying to key my amp(qro hf-1000) and the amp staying keyed, I
> disconected the whole thing and started to panic. The relay is ONLY used in
> the DIN connectors and switching diodes are in the phono jack. Anyway, I got
> lucky and found that I did not fry the diodes or weld the relay shut. I
> purchased a relay cable from Bob, W2ENY for $35.oo. Its a small relay neatly
> tucked into a din connector and a phono male jack for the amp. IT WORKS
> GREAT!!! best investment I bought. neat clean does the job. Well worth it and
> IMHO better than mfj relay box.
>  <A HREF="http://members.fortunecity.com/w2eny/relay/">Relay in the Cable for
> Icom</A>
> good luck and let me know if u need any more info.. he has a web site btw..
> 
> larry... N2LH
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