tranponder
 

which tranponder I should buy to work with all club?

RC4 hyprid tranponder
http://www.mylaps.com/en/products/rc...transponder/79

or

RC4 tranponder
http://www.mylaps.com/en/products/rc4-transponders/78

The Hybrid transponder is the one to purchase as it will work with both RC3 and RC4 Decoders. The RC4 only will not work at all with earlier RC3 systems and many clubs still use RC3

There's also the MRT PTX, works with all systems.
http://stores.ebay.co.uk/MRT-Racing-Supplies

These seem crazily expensive for such a small piece of kit surely there isn't much to them

This is the way to go
http://m.ebay.co.uk/itm/MRT-mPTX-Pro...-/281949959920
You don't need the case

im getting harry hyprid, saves me hassle.

i know its crazy money for tranponder. :o

transponders
 

I do have some used ones for sale:woot:

AMB ‘Purcy’ Transponder RC4 ONLY Compatible £60
AMB 'Harry' Transponder RC2/3/4 Compatible £65
AMB 'Pete' Transponder (old type) RC2/3/4 Compatible £50

Regards Sam