GAI-Tronics MRTI 2000 (No. PL1877A) Microprocessor Radio Telephone Interconnect Installation & Service Manual - Manual (Page 148)

Pl1877A – Radio Installation PL1877A Microprocessor Radio Telephone Interconnect
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Intercabling Diagram for Enhanced VOX Simplex Mode – Mitrek Consolette Base Station to PL1877A
MAXAR and MOXY Bases
The MAXAR and MOXY bases are characterized by all pins in the cable connector being the same size.
Install the following modifications/additions to the base station using the female connector pins supplied
where necessary.
1. RX Detector Audio – Run a wire from U10, pin 6, to J601-13 (wire for meter 2 may be in pin 13 of
J601 and possibly could be rerouted and used for this function.
2. TX PL Disable – Run a wire from the PL/DPL code disable – pin CD or TD on the PL/DPL deck to
J601-3.
3. PL Detect
Tone PL (reed type, TRN6177C and similar) Locate and remove the soldered-in JU401 and install
a 100k, ¼ W resistor in its place (N
OTE : There are two JU401’s shown on the board pictorial. The
correct one for this function is the one in series between U401 pin 13 and Q409 base. This resistor
allows pin 13 of U401 to swing between detectable logic levels).
Remove C428 and replace it with a 1
µF capacitor, observing polarity.
Run a wire from U410 pin 13 to J601, pin 10 (wire for meter 1 may be in pin 10 of J601 and possibly
can be rerouted and used for this function).
Tone PL (reedless type, TRN 4237A and similar) Run a wire from U401, pin 28, on the PL deck
to J601, pin 10 (wire for meter 1 may be in pin 10 of J601 and possibly can be rerouted and used for
this function).
Digital PL (TRN6207A and similar) Run a wire from U301, pin 7, on the DPL deck to J601, pin
10, (wire for meter 1 may be in pin 10 of J601 and possibly can be rerouted and used for this
function).