KO Esprit 4 Issues???

[Adam F]

Ok, so I have a really odd problem with my KO 4/413 receiver.....

I use it in my KF2 indoor without any issues weekly. (413 receiver, Sky RC speedo, TP motor, expert servo and MRT PT)

But when I ran it in my Tekno EB48, (411 receiver, HW Speedo, Tekin Motor, Savox servo, MRT PT) it's range was really poor, (Like 5 meters)

So I:

Swapped the receiver for another 411 that I know works fine - still the same
Fitted a brand new Tekin Speedo/motor - still the same
Tried the 413 receiver from my KF2 with the new speedo/motor - still the same
Disconnected the PR with all the new stuff fitted - still the same!!

I've now dropped in my old Universe 3 with a 409 receiver and its fine, so I have no idea whats going on... I have ruled out pretty much everything except the servo, but can't see how that would effect only one transmitter/receiver....

Any idea's?