I have had a similar problem (with my P3S). When I installed the Argtek my maximum range was similar to TS. I see in his pictures that the connectors are not 100% attached. Therefore my advice to do it again.When I fitted the ARG to mine the connectiors fell off the printed circuit board and left me with no range the only fix I found was to buy a second Hand transmitor from eBay as spares seem to be impossible to come by