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|  (3) Record the RF and audiofrequencies
microswitch in the ANT jack housing.
being used and the deviation indicated on
(Use the brass adapter nut for short
the ME-57/U.
antenna tests only.)
(4) Set the test assembly TRANSMITTER
(4) Install the selected transmitter load be-
CARRIER switch to OFF.
tween the amgator clips as indicated in
(5) Repeat the procedures given in (2), (3),
figure 79.5. Always ground the resistor
and (4) above with modulation frequencies
end of the transmitter load. The trans-
of 300, 2,000, and 3,000 cps.
mitter long antenna load characteristics
(6) Repeat the procedures given in (2), (3),
and minimum acceptable RF voltages
and (4) above with the RT-505/PRC-25
developed across the resistor of each load
set to 60.00 mc and modulation frequencies
are identified in the chart below.
of 300, 1,000, 2,000, and 3,000 cps.
(7) Evaluate the test results. At both 47.00
Long antenna loading
and 60.00 mc, acceptable deviation must
be within the following limits:
Load
characteristics
Minimum
Modulation
Acceplable
Test frequency (me)
voltage
frequency (cps)
dcuiation (kc)
(rms)
(ohms)
(uuf)
10 +3, 4
300
102
1,000
2,000
103
0
30.00------------------
130
9
103
0
3,000
52.50-----------------
619
21
53.50------------------
400
8
16
e. Sidetone Test
70
75.00------------------
82
8
(1) Perform the sidetone teat with the equip-
ment connected in a standard transmitter
setup (para 103 and fig. 79.8), except set
(5) S e t the test assembly TRANSMITTER
the RT-505/PRC-25 VOLUME control
CARRIER switch to ON and read the RF
fully clockwise and disconnect TS-723A/U
voltage across the resistor of the trans-
test cable No. 4 from the ME-57/ U output
mitter load with the ME-26B/U. The
and connect it to test assembly terminals
minimum acceptable reading is listed in
C and D (shield) of terminal board TB1.
the chart in (4) above.
(2) Set the test assembly TRANSMITTER
(6) Set the test assembly TRANSMITTER
CARRIER switch to ON. The TS-723A/
CARRIER switch to OFF.
U (used as a vacuum-tube voltmeter)
should indicate greater than 0.7 volt.
(7) Repeat the procedures given in (4), (5),
(3) Set the test assembly TRANSMITTER
and (6) above at 52.50, 53.50, and 75.00
CARRIER switch to OFF.
mc. Use the chart in (4) above to correlate
the required test frequency, transmitter
f. Antenna Loading Tests.
load, and minimum acceptable voltage.
{1) Perform the antenna loading test with the
equipment connected in a standard trans-
(8) Unscrew and remove antenna load adapter
mitter test setup (para 103 and fig. 79.8),
No. 2.
except disconnect the AN/URM-43A input
(9) Install the brass adapter nut on antenna
lead at the RT-505/PRC-25 coaxial ANT
load adapter No. 2 and reinstall the adapter
connector, set the RT-505/PRC-25 to
in the whip ANT jack.
30.00 mc, install the transmitter long
Note. Load adapter No. 2, with the brass nut,
antenna 30-megacycle load as described in
should not energize the ANT housing microswitch.
(2) through (4) below, and connect the
(10) Install the short antenna 30-megacycle
ME-26B/U in parallel with the resistor of
transmitter load between the alligator
the transmitter load (fig. 79.5).
clips; make sure the resistor-end of the
(2) Remove a mounting screw from one corner
load is grounded.
Transmitter short
of the whip ANT jack and install antenna
antenna characteristics and minimum ac-
load adapter No. 1 (ground connection).
ceptable RF voltages are identified in the
(3) Install antenna load adapter No. 2 in the
following chart.
whip ANT jack; make sure it operates the
20
TAGO
8344-A
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