ORIGINAL: 8178
David,
The 7C has a cable that plugs into the slotted connecter on the bottom of the TX for checking the receiver batteries. Don’t know about the direct servo control. I think there was a separate box for that.
Mike,
that makes sense. I read that a cable existed for this and the appropriate voltages are indeed shown on the ESV for the Rx battery voltage. What I don't understand is why there are 4 leads at that jack in the Tx. Perhaps they are needed as the signal needs to pass via the encoder in order to provide adequate load on the Rx battery for proper voltage measurement. However, the plug at the other end on the model's switch presumably still only has two leads - red & black - so I'm not clear why 4 leads are needed. If you have such a cable it would be helpful to see how it is wired if it is not shielded by an outer sleeve. It would also be helpful to see the wiring of the KP-7C Rx switch if it has any more than the two standard power leads.
David.