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.
