Back in the old days I converted several MII's in 800 Mhz from GMARC to LTR.
There was a mod the the channel element where an un-used pin applied txdata
to the compensation circuit in the element - This was a mod from Cook's in
California where they made a sharing system to run both GMARC and LTR on the
same repeater.
You should have no trouble applying data to the channel element - you may
have to invert the data and seemed like a 10kohm resistor was used - I use a
test ID code on IDA RLC's so that when I ground the test pin it will send
the test ID and a subscriber unit should unmute on proper decode. Once I
have the transmit working, then I connect to discriminator audio and get the
decode working - standard test is to use 100 hz audio at 1kc deviation to
simulate mobile data for level setting, and txdata set to 1kc peak to peak.
I usually set voice for 2kc in for 2kc out at 1000 hz and total system
deviation at 4.0 kc.
Wish you success,
Steve
NU5D
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