ZETRON 748, Technical Manual

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Installation
025-9368H 21
Tait T800 Series Repeater
For: Zetron Model 38, 38-MAX, 39-MAX, 45B, 48B, 48-MAX, 735, 745, 748
To: Tait T800 Series Repeater
Using: 709-7112 Generic radio cable
ZETRON END RADIO END
Function Pin Color Connection / notes
12 volts AC/DC in 1 Red TB1-13 +13.8V
12 volts AC input 2 --- TB1-14 -VE (ground jumper)
TB1-10 SP- (ground jumper)
TB1-10 (ground jumper)
TB1-8 (ground jumper)
DC ground 3 Black TB1-8 TX LINE (ground)
Ground 14 Brown TB1-8 (ground)
Ground 4 Shield No Connection
PTT NC 5 ---
PTT COM 6 Jmpr
PTT NO 7 Orange TB1-12 TX KEY
Aux relay 8 ---
Sense/alarm 9 ---
COR input 10 Yellow TB1-11 RX GATE
TX audio 11 Blue TB1-5 TX LINE
Ground 12 ---
CTCSS/DCS encode 13 Green TB2-9 CTCSS
Discriminator in 15 White TB2-11 (RX audio)
TB1-2 RX LINE CT (jumper)
TB1-3 RX LINE CT (jumper)
TB1-6 TX LINE CT (jumper)
TB1-7 TX LINE CT (jumper)
Radio Configuration:
1. Move the Violet wire from TB2-9 to TB2-11. The Violet wire (RX Audio 2) is flat receive
audio, separated out to TB2-11.
2. Set the jumpers in the receiver as follows;
a) PL101: 1-2. Flat audio.
b) PL105: 1-2 and 4-5. Routes flat RX audio to “audio 2”.
c) PL106: 1-2. Routes flat RX audio to “audio 2”.
3. Disable the transmitter time-out timer by removing R257 (near IC202 on bottom of PCB).
Default levels: TX-audio = 0.11vrms = 3 kHz deviation
CTCSS/DCS = 0.32vrms = 700 Hz deviation
COR = +12vdc SQ., 0vdc USQ
RX-audio = 0.77vrms = 3 kHz deviation, flat 3-3000 Hz. Do not use with
noise detector.