9/18/94 My mods to FT-726 is as follow. 1. RX data connection RX signal is drawed from the junction R44-DO4(1S188) with 10K ohm resistor. It must be connected to RX in of G3RUH modem 2. TX data injection You must inject both TX unit and Satellite unit if you need full duplex operation ( example for uosat4/5 ). The TX data injection point is DO5(FC-53)-C27 in TX unit and DO6(Fc-53)-C25 in SAT unit. You may be able to direct connect from TXD out of G3RUH modem as DC decoupling is in the modem board. 3. You need selection SW for TXD injection to select sinplex/full duplex operation. The above mod was sent to me by Tom, K8TL and it is the mod I am using in my FT-726 and it worked first time. I am using the PacComm external 9600 baud modem along with an MFJ-1278 and it worked so well when I fired it up for the first time I never even had to adjust the audio levels. I mounted a small bracket on the rear of the radio and brought the audio signal lines out the back of the radio to a connector on that bracket. The up/down control I feed in the Mic jack and it works very well. I use a small relay to switch between the Sat and Main RX board but really it is un-necessary as I never use it on Terrestrial. I keyed the relay from one of the lines on the Sat board that gets A+ in the Satellite mode from the Satellite switch so it automatically switches, but as I said above if he is not going to be using Terrestrial all he need to do is install the Sat RX part and he is away.