29
3-3-2, VOX SIGNAL & VOLTAGE MEASURMENTS
If at any time during this procedure the transmit power comes up to full remember to keep the transmit cycle short.
With the equipment set as per section 2-2-1 we will switch to VOX and set the VOX control to the center of its rotation
MEASURED WITH SCOPE
MEASURED WITH DVM
TIE POINT OF R80 & R81
V13A pin 7
V14C pin6
V13B p3 V14C p3
V13B pin 1
50
–
75mvpp
1.5
–
2.5 vpp
30vpp
0 / 15vdc *
305 / 169vdc *
NOTE * When VOX is operating correctly the first voltage is UNKEYED the second is KEYED.
Return to 2-2-2 when fault is cleared
3-3-3,.CARRIER OSC
MODE / VOLTAGE CHART
OPERATION
FUNCTION
R1
–
R2
R2 bottom
V1pin1
V1 pin2
V1 pin3
MOX
AM
-138vdc
-140
265vdc
-130vdc
0.0vdc
MOX
CW
-1.4vdc
0.0vdc
199vdc
0.0
3.0vdc
NOTEs: Some schematics have R2 listed as C2. Voltages will differ from rig to rig. In the rig used for these readings the
250vdc measured 313vdc, the bias measured -140vdc.
3-3-4 HET OSC
HET OSC VOLTAGE CHART
FUNCTION
OPERATION
V15
PIN 1
PIN 2
PIN 3
PIN 6
PIN 7
PIN 8
MOX
AM
144
0
0
302
57
53
3-3-5 VF0
VFO VOLTAGE CHART
OPERATION FUNCTION
V10
PIN 1
PIN 2
PIN 3
PIN 6
PIN 7
PIN 8
PIN 9
MOX
AM
141vdc
0
86
141*
0
4
0
*Measured at junction of L2 & R24
3-3-6, MIXER-IF
MIXER/IF VOLTAGE CHART
V6
V7
V8
PIN
VOLTAGE
PIN
VOLTAGE
PIN
VOLTAGE
1
0
2
0
2
-144/-0.5
2
1.0
*
3
83/73
7
317/276
