Vintage Futaba gear and receiver range problems

[jpmatrix]

I recently bought a Madrat and have installed the following

mtroniks sniper rv12 esc
17t schumacher brushed motor
3700nimh battery

The transmitter and receiver are vintage (20yrs old) but Im sure they are working perfectly.

The receiver is a Futaba fp-r102je
Transmitter fp-t3egx 27mhz
Dontknow what servo but seems to work fine.

The problem I hve is when the car runs more than 40m away or so the throttle stutters. Everything seems fine when in close proximity.
I have swapped crystals, swappd the reciever and tried anothr transmitter but still havethe same problem.

It was actually worse when i tried another futaba transmitter, All the batteries were fully charged and ariel fully extended.

This problem only occurs when it goes furthr out of range.

I thought it was enclosed space built up area that was causing it but on Sunday it stuttered at Torch race track which was dam annoying.

Any ideas what is causing this?

Pic of car incase my set up is causing it???

Resized to 44% (was 778 x 584) - Click image to enlarge




transmitter


Resized to 44% (was 778 x 584) - Click image to enlarge

Someone mentioned about 'trimming the attena down'? The problem is I am not sure what all the trim settings do or what levels to set it at. Could this be the problem?

Ideally has anyone got any experience of this futaba set and how everything functions..

regards

James