TM 11-6625-333-15
(5) Adjust the transmitter for cw operation
(1) 28-volt direct current (dc) power source
At the highest transmitting frequency.
to power a radiofrequency (rf) power source.
(6) Key the transmitter.
( 2 ) Telegraph key KY-116/U,or equivalent.
( 7 ) Compare the power indication on the
(3) A 51-ohm, -watt composition resistor,
ME-165/G with the power indication on the AN/
( 4 ) Wattmeter AN/URM-120.
URM-120; the indications should agree within 10
( 5 ) Necessary cable assemblies (such as,
percent.
R a d i o Frequency Cable Assembly CG-2340A/U,
( 8 ) Set the ME-165/G function switch to
or CG-2568A/U) to connect the equipment.
ADJUST
(9) Key the transmitter and rotate the
and perform the following:
ME-165/G ADJUST rotary control until the
( 1 ) Set the ME-165/G function switch to
meter indicates full scale.
POWER.
( 1 0 ) Set the ME-165/G function switch to
SWR.
(2) Adjust the transmitter for cw operation
at the lowest transmitting frequency.
(11) Key the transmitter and observe that he
M E - 1 6 5 / G meter does not indicate beyond the
(3) Key the transmitter.
mid point in the green segment of the dial.
( 4 ) Compare the power indication on the
d. The following chart specifies typical symp-
ME-165/G with the power indication on the AN/
toms of equipment malfunction and procedures to
URM-120; the indications should agree within 10
be followed in connecting these troubles:
percent.
Checks and corrective measures
Probable trouble
Trouble symptom
Check CR1.
No ME-165/G power meter indication
b. Defective R13, R16, or R17 ____ b. Check R13, R16, and R17 for open
on AN/URM-120-------------------
circuit.
c. Defective capacitor C4__________ c. Check C4 for short circuit.
d. Defective function switch S1 -------- d. Check contacts and continuity of S1.
e. Defective Meter Ml___________ e. Check Ml by substitution
Meter linearity inaccurate at lower
Adjust meter linearity at low-frequen-
ME-165/G power indication not within 10
frequencies________________________
cy end.
percent of AN/URM-120 power indica-
tion at low frequency end.
Adjust meter linearity at high-frequen-
Meter linearity inaccurate at higher
ME-l65/G power indication not within 10
frequencies______________________
cy end.
percent of AN/URM-120 power indica-
tion at high-frequency end.
a. Defectivc diode CR2 ____________a. Check CR2.
No meter indication when function switch
is set to ADJUST --------------------- b. Defective R15, R22, or R23_________________b. Check R15, R22, and R23 for open
circuit.
c. Defective function switch S1 ----- c. Check contacts of switch S1.
Resistor R18, R19, or R21 open or
Measure resistance of R18, R19, R20,
Meter pointer reads beyond green segment
and R21.
of dial when function switch is set to
more than 3 percent out of tolerance.
4-2
