Technical, Techniques, Hints, and Tips > Radio Equipment

Modifying a HS-785HB Servo

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firstime67:
Hi all
I have International One Meter yacht. The sails are controlled via a Hitec HS-785HB winch servo. At present the winch rotates three revolutions with my Futaba 40Mhz T4YF Skysport Transmitter. Can any one tell me how to make it rotate just two revolutions, while maintaining fully available sail stick control? I have the capability to carry out any modification, but need to know the procedure.
Thank you.

barriew:
Does the Tx have adjustable servo throw?

Barrie

firstime67:
Hi Barrie

Unfortunately, no. The instruction for the HS-785HB say’s to adjust the throw of the transmitter stick (or the ATV of the sail winch channel),  neither of which are mention in the Futaba manual. At present with the three revolutions of the winch I have an excess of sheet to wind in. I have yet to find out what ATV is.

Regards.
firdtime67.

BobF:
Hi firstime67,

There is a mod which is fairly straight forwards. Depending on the transmitter, you will require a 5k or 10k miniature linear carbon track potentiometer. This is fitted between the middle terminal of the rudder pot and the circuit board, and is fitted into the transmitter in a convenient place where there is room.

I have a copy of Marine Modelling October 1995, where this is described in full, but at the moment my scanner is not working so I can't email you a copy. I think that I have also seen this mod on the internet, but can't remember the site name though.

Bob

Just remembered that one of the servo manufacturers had a mod that fitted in the servo wire. But again I have no information to hand on who it was. If I can find it I'll post again.

Faraday's Cage:
Welcome firstime67,

ATV (adjustable travel volume).

Radios with ATV allow you to set how far a servo arm can move from its neutral position to either side. ie 100% travel either side to 0% travel.  In your case, amount of turns on your winch.

Terry.

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