TM 11-6625-622-40
To
From
Check
J1-pin
56
J6-pin
r
43
J1-pin
56
J6-pin
s
44
J1-pin
56
J6-pin
t
45
Ground
pin P1
J1-pin
18
46
Ground
pin P1
J1-pin
27
47
J2-pin
60
48
J1-pin
60
3-5. Troubleshooting Directional Wattmeter
a. Connect the equipment as shown in the block
d i a g r a m (fig. 3-4). Key the receiver-transmitter
i n the AM mode with the test unit KEY switch,
and adjust the receiver-transmitter for an un-
modulated rf output of 72 volts across the 52-ohm
l o a d . Check the indication on the RF OUTPUT
meter for each position of the meter switch.
Meter indication
Position
FORWARD 200 watts ------
100 watts 25
FORWARD 2000 watts ------
Approx 100 watts
REFLECTED 2000 watts ---
No indication
REFLECTED 200 watts ----
Not more than 1.5 watts
b. If the above indications are not obtained,
the directional wattmeter must be replaced.
Figure 3-2. Test unit chassis, including dummy antenna,
parts location
3-6
