Model Forum / Radio Controlled / Helicopters / January 2005

A table of 72 MHz channels can be found here

http://www.indoorduration.com/rcfrequency.htm

Your transmitters are:

Futaba        -   60
JR               -    27
Honeybee   -   54

My guess is that the Futaba will work fine and the JR not - see later.

Things to watch for:

(a) Receiver crystal size - Some are full size some are half size depending
on make of receiver.  If you decide to replace the receiver crystal then
this is important.

(b)  PPM or PCM - I would guess that the radio for the honeybee is PPM and
not PCM.  In the unlikely event that it is PCM then neither of your other
transmitter will work.

(c) Single or Dual Conversion - Assuming the radio is PPM then the receiver
can be single or dual convesrion.  My guess is that it is single conversion.
If you decide to change the receiver crystal then make sure you get the
right type.

(d) PPM Signal Type - There are at least two different formats of PPM
signal.  I call them Futaba and JR though there is probably a more technical
name.  Basically a JR transmitter wont work with a Futaba receiver and vice
versa.  I'd put money that it conforms to Futaba because this is by far the
most common being used by (Futaba, Hitec, Airtronics, Sanwa to name but a
few).  JR are pretty much on their own.

So I reckon you've got a single conversion, PPM, Futaba style which means
you have thwo options

(a) Put a 54 crystal in your Futaba (Easiest)
(b) Put a 60 crystal in your honeybee receiver (Hardest because you need to
make sure you get the right size and conversion type)

Cheers,

Nigel