Well after Peter‘s post above I decided to indulge in a couple of sets of the Piko Rc units. At around £60 each from Topslots they looked a pretty good deal. Though usual disclaimer, I find their service as always top notch though I did not search any harder for a lower price being happy to support this excellent Coy. The delivery was good too being just 5 days from order to a ring at my doorbell.
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I followed the wiring as shown in Peter’s diagram just substituting a Fosworks wiring loom for the on/off and using my test chassis. It all went together very well and works as expected. I have not tried it out on the line as yet so cannot comment on range, but as I tend to walk around the line with my trains so long as I get at least 20 or so feet that will not be a problem.
Here is my test setup On the bench today. Note I have taken out the Piko on/off switch from the circuit feeding power in where the grey and black wires were disconnected from the Rx.
Red U1 and Black U2 are power feed doubled out of the MLS to the battery via the Fosworks switch loom (right) and U1 U2 on the Piko Rx.
Yellow M1 and Green M2 are motor connections doubled out of the Rx to the MLS and Chassis.
Brown wires are the 2 sound functions from b to MLS whistle (button I on the Tx) and r to another MLS Sound(button II on the Tx), I have gone for the bell.
2 Black wires to the speaker.
The only thing I have found is that there is no sound till you do start moving using the Tx, this is a bit disconcerting at first particularly when setting up! But once the sound is up and running it stays on unless you have set up for the sound to go off after the preset on the MLS.