[Premium-Rx] RS 232 for Ra 6790/GM

[Sid Leben]

I own a Racal RA 6790/GM receiver that I wish to use with ERGO 4.
Before I order ERGO 4, I would like to fabricate the RS 232 interface
cable for the receiver.  

I can not locate any data on the ERGO website for pin-outs.  Does some
one have this data?

All help would be much appreciated.  I am in the process of trying to
obtain the round 26 pin plug for the receiver end with no success.   The
receiver end is M83723-02R-1626N.  Does anyone have a source ?
When all
complete, I intend to listen to the radio via a networked computer in
another part of the house.

Many thanks.

Sid Leben  KC2EE