futaba magnum junior - what are..

[madbad jezza]

i,m using a futaba magnum junior transmitter on both my mardave and another optima that i,ve re-built. my question is - on the right hand side face of the transmitter, there are 2 adjustable screws - (throt A.V - high/low) - what exactly do these switches do?, and is there anything i should know about these switches when setting up an ESC?.

any advice greatly appreciated [].

james.

[fury_dice(2)]

Hi James

I have one of those - the pots are to set the 'end points' on the throttle channel, i.e. max forward and max reverse. I guess it's if some sort of servo-operated throttle (like an MSC) travels further in one direction than the other.

I have only used them with an ESC when I wanted to limit the max speed for the nippers to drive. I set the ESC's up with these maxed, as you fix the end-points on the ESC itself during the setup process.

I'll double check on the actual unit tonight and amend this post if necessary. HTH. David

[madbad jezza]

ah,ha.....that might explain why the throttle servo on my mardave (nitro) packed-up - it seemed as though the motor was burn out?. i had the servo set up so it only worked in one direction, but the weird thing was - and i,m not sure how to explain what was happening - but if the servo was operated to maximum throttle, if i adjusted one of the screws on the right hand side, the servo automatically went back to neutral - while the throttle trigger was held full on [8)]????. there,s also a throttle trim button on the left hand side, but i keep that set at zero. i think (hope..) i,ve finally set the mardave up ok, but i,ve fitted an ESC on the optima and i dont particularly want to burn that out with incorrect settings.....[xx(].

great transmitters - they,ve just got more buttons than i,m used too...[:I].

james.

[Terminal_Junkie]

Hi,

Use a 3PDF that also has ATV settings although as the radio is a computer set they are digital. The ATV is designed to limit how far the servo moves and designed to overcome limitations in mechnical adjustment. For example:

Full steering lock is reached at aprox 75% of maximum servo travel, but it trys to move the other 25% and you end up with something along the lines of the unmovable object against the un-stopable force.

By setting the ATV you effectivly tell the TX "when i input 100% travel i want you to send only 75%" and the servo stop moving just before or dead on full steering lock. Hope this makes some sense as i've done a pretty poor job of explaining things, lol!