35
Expected signal levels
Test point
number
Description of signal Expected levels
1 45MHz Filter input See Fig 1
2 45MHz Filter output See Fig 1
3 DDFS output, square wave 0-3V (digital)
4 Carrier Insert Oscillator receive (CIO RX). Square wave 0-3V (digital)
5 Master Clock (MCLK), square wave 0-3V (digital)
6 Monitor tones to speaker amp 1 V P-P
7 -5V - 5 V DC
8 First Local Oscillator (LO1), square wave 0-3V (digital)
9 Audio compressor output. (for -50dBm signal input to Rx) 2V P-P
10 Speaker (reading depends on volume setting) 0-11V P-P
11 Speaker audio output from DSP 1.4V P-P
12 +3.3V monitor +3.3V
13
ALC power level for PA ( for 100W and PTT with no power
respectively)
2.3V / 3.3VDC
14 AGC (for no signal and -50dBm signal input to Rx respectively) 3.3V / 2.3V
15 Line audio input (depending on input) 3V P-P nom
16 3rd Tx mixer output 455kHz 4V P-P
17 Transmit audio (Mixer 3 input) 4V P-P
18 I.F. Amplifier output (-50dBm at antenna) 1.3V P-P
19 Rx audio from product detector (for -50dBm signal input to Rx) 1.7V P-P
20 VCO frequency ÷10 4.5- 7.5 MHz
21 Second local oscillator , L.O. 2, Square wave
22
Carrier Insert Oscillator, approx 455 KHz, C.I.O. Tx , Square
wave
0-3V (digital)
23 Serial Clock, square wave 0-3V (digital)
24 Serial data, 0-3V (digital)
25 +1.5 V
26 +10 V
27 SSL (AGC to DSP) with signal with no signal respectively 0.7 / 0.2 VDC
28 Tx. Audio (to DSP) 3 V p-p
29 +5V
30 Factory debug
31 Factory debug
Note:- Receiver levels measured in receive mode, with either no signal input or as noted with a signal
level of -50dBm at the antenna socket. Transmitter levels measured with PTT applied with either no
modulating signal applied or modulated to rated power output as noted. DC voltage input
+13.8VDC.
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