HARDWARE INSTALLATION
Be certain to follow standard anti-static procedures when handling any of Midian’s products.
Connector P1
P2-A (Pin 1) – Green
– HI Z – Connect to a high impedance audio point in the transmitter modulator.
P2-B (Pin 2) – Red
– VIN +6-24 VDC – Connect to switched battery point in the radio.
P2-C (Pin 3) – Brown
– LO Z – Connect to a low impedance audio point in the transmitter modulator.
P2-D (Pin 4) – Black
– Ground – Connect to the nearest ground plane in the radio.
P2-E (Pin 5) – Blue
– Speaker Output– Connect to the high side of the radio's speaker. The speaker completes
the ground for the emitter follower Q1. The sidetone level can be increased by reducing R2 and R3. Use caution,
if the current gets too high it can burn up resistors R2 or R3 or Q1. CAUTION: When attaching this lead to a 4 or
8 Ohm speaker, add a 100 Ohm resistor in series with this blue lead to limit current. When using 20-40 Ohm
speakers, the onboard resistor in series with Q1 should be sufficient.
P2-I (Pin 9) – White
– PTT Output – Connect to the PTT switch of the radio. The PTT Output gives an open-
collector to ground when activated and is rated at 100 mA continuous.
The remaining 7 wires are not connected.
HARDWARE ALIGNMENT
DTMF Output Level:
The DTMF output level can be adjusted for 0-750 mV RMS by adjusting RP1. In a wide
band system, set RP1 to 3.3 KHz (66% of 5 KHz) of deviation per EIA specifications. In a narrow band system,
set the RP1 to 1.65 KHz (66% of 2.5 KHz) of deviation per EIA specifications.
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