TM 11-6625-828-45
(3) Adjust the test set 1000 - MOD
(4) Check that the AN/ARN-30E course
control to obtain a 30% indication on the test set % M
indicator,
TO-FROM meter indicates TO on all track
meter and set the IDENTIFIER OFF/ON switch to ON.
settings of
the test set OMNI TRACK switch and indicates FROM on
and 5 switching actions per sweep.
the reciprocal tracks.
(4) With the test set IDENTIFIER OFF/ON
switch set to ON, first set the test set MODULATION
the AN/ARN-30E receiver ANT connector. Set the RF
switch to OMNI and then to the three AMP LOC
signal generator FREQUENCY control to the exact
frequency of the test set B crystal, the OUTPUT LEVEL
display is similar to that in (3) above for each switch
control to 100, VOLTS, and the MODULATION switch to
position.
ON.
l. . RF Attenuator Test Check that test set 51-
ohm termination cap is connected to the 1-volt jack.
NOTE
Connect the AN/URM-145 to the test set RF OUTPUT
Make sure that the AN/ARN-30E
ATTEN connector, with the 50-ohm adapter MX4528/U
receiver and converter are properly
sup- plied with the electronic voltmeter, and proceed as
installed in the system mounting rack.
follows:
(1) Set the test set MODULATION switch
(6) Remove the rear cover from the
to EXT and the test set ATTENUATOR g V control to
AN/ARN430E mounting rack and connect the ac
voltmeter to pins 2 and 6 of connector J302 on the rack.
1000. Set the electronic voltmeter RANGE-FULL SCALE
Record the ac voltmeter indication.
control to .003 and observe the electronic voltmeter RMS
(7) Disconnect the RF signal generator
VOLTS meter. The meter should indicate i 1 millivolt.
and connect the test set RF OUTPUT ATTN connector
to the ANT connector of the AN/ARN-30E receiver. Set
from the test set and replace the test set 51-ohm
termination cap. Rotate the test set ATTENUATOR EV
the AN/ARN-30E control unit MC control to the exact
frequency of the test set B crystal and observe the
control to the 10,000 position and check that the control
voltage indication on the ac voltmeter. The voltage shall
engages the attenuator stop at that point.
m. Operation Test (fig. 4-9).
be within 0.1 volt of the reading obtained in (6) above.
Disconnect the ac voltmeter and replace the rear cover
on the AN/ARN30E mounting rack.
NOTE
(8) With the test set and the system
Warm up the test set for at least 2 hours
connected as in (7) above, set the AN/ARN-30E course
before performing this check.
indicator to 0 degrees and set the test set MODULATION
switch to the 9960 --. Adjust the test set 9960 - MOD
(1) Remove the test set 51-ohm
control to obtain a green line indication on the test set %
termination cap and connect the electronic counter to the
M meter.
test set RF OUTPUT 1 VOLT connector. Set the test set
(9) Set the test set MODULATION switch
MC switch first to A and then to B and check the
to 30 - and adjust the test set 30 - MOD control to obtain
electronic counter at each position to determine that the
a green line indication on the test set % M meter.
A and B crystal frequencies tolerance is within i 0.005
(10) Set the test set MODULATION switch
percent.
to 90 - and adjust the test set 90 - MOD control to obtain
(2) Disconnect the electronic counter from
a green line indication on the test set % M meter.
the test set. Rotate the test set 51-ohm termination cap,
(11) Set the test set MODULATION switch
and connect the test set RF OUTPUT ATTN connector
to 150 -and adjust the test set 150 - MOD control to
to the receiver ANT connector of a standard AN/ARN-
obtain a green line indication on the test set % M meter.
30E radio receiving set.
(12) Set the test set OMNI TRACK switch
(3) Set the test set MODULATION switch
to 0 and set the test set MODULATION switch to OMNI.
to OMNI and set the test set ATTENUATOR A V control
Check that the AN/ARN-30E course indicator indicates 0
to 100. Check that all 24 positions of the test set OMNI
degrees i 2 degrees and that the TO-FROM meter
TRACK switch are operating and that the course
indicates TO.
indication is within system tolerance (I2 degrees).
(13) Set the AN/ARN-30E course indicator
and the test set OMNI TRACK switches to each
Change 1 5-5