Melbourne, Florida USA
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If you are using DSMX sats directly with the HC you can assign the Head gain/Horizon to TX channel 8 on the RC page of the HC software. Assign TX channel 7 to Output 2 and should should be good to go as far as the HC is concerned. If you are using DSM2 sats you are restricted to 7 channels and will need to give up the ability to adjust the tail gain from the TX.
If you are using a receiver with the supplied interface cable you would plug the Head gain/Horizon wire into channel 8 of the receiver.