Instruction manual
Setup and Installation
40 025-9209
TP1 (Audio in) Set to 1V P-P using
RXAUD pot. Repeat Step 3 but for transmit audio on
RTU #2 and receive audio on RTU #1.
CAUTION
Remove the jumpers when finished testing. Do not to leave the radios
transmitting continuously as this can harm some radios.
MODEL 1708 JUMPERS AND I/O
The jumper and I/O connector information in this subsection applies to the Model 1708 (Part
No. 901-9260). For similar information applying to the 1716, see page 42.
Model 1708 Jumper Settings
Jumper Name/Signal Description
JP1 Carrier Detect
A = 47kΩ pull down to ground
B = 47kΩ pull-up to +12 V
dc
JP2 Serial Port Power Connects +12 V
dc
(fused) to J2 Pin 6 of RS-232
Connector (DB9)
JP3 Push-To-Talk
A = PTT completes the connection between P3 Pin 3
and Pin 4.
B = PTT provides a ground indication on P3 Pin 3.
JP4 Push-To-Talk
IN = Push to Talk provides a +5 V
dc
pull up on release.
OUT = Push to Talk goes to open upon release.
JP5 Test A 1800 Hz Test Tone — See Table 20 for instructions
JP6 Test B 1200 Hz Test Tone — See Table 20 for instructions
JP7 Receive Audio Gain A = Low 1x gain on Receive Audio
B = High 10x gain on Receive Audio
JP8 External Audio A = External Audio Source Input
B = No External Audio
JP9 Transmit Audio
A = 50 Ω impedance
B = 600 Ω impedance
JP10 Carrier Detect Adjust A = Adjustable Carrier Detect threshold, 0 to 10 V
dc
B = 0-0.7 V
dc
Logic low, 3.5-5.0 V
dc
Logic high
JP11 Analog Input #1
Adds 249 Ω load resistor
JP12 Analog Input #2
Adds 249 Ω load resistor
JP13 Analog Input #3
Adds 249 Ω load resistor
JP14 Analog Input #4
Adds 249 Ω load resistor
JP19 +5 V
dc
Output IN = +5 V
dc
enabled on J1 pin 16
OUT = +5 V
dc
disconnected on J1 pin 16