TM 11-6625-828-45
CHAPTER 1
FUNCTIONING OF TEST SET, RADIO AN/ARM-5A
megacycle (me) frequency range. Signal paths are
1-1.
Scope
shown in the block diagram (fig. 4-10) and are discussed
a. This manual covers general support (GS)
in a through m below. For complete circuit details, refer
and depot maintenance for Test Set, Radio AN/ ARM-
5A. It includes instructions appropriate to GS and depot
a. Tone Generator. Modulation frequencies in
categories for troubleshooting, testing, aligning, and
the SG-66B/ARM-5 are produced by tone generator
repairing the equipment, replacing maintenance parts,
MG101. The modulation frequencies are derived from
and repairing specified maintenance parts. It also lists
two tone wheels (E101A and E101B) by means of five
tools, materials, and test equipment for GS and depot
pickup coils (L10I, L102, L103, L104, and L105).
maintenance. Detailed functions of the equipment are
b. OMNI TRACK Switch.
OMNI TRACK
b. The complete technical manual for this
equipment includes TM 11-6625-828-12.
paired to determine phase results, capable of shifting the
c. The reporting of errors, omissions, and
track angle through 3600 in increments of 30.
recommendations for improving this publication by the
c. Reference
and
Variable
individual user is encouraged.
Reports should be
Reference amplifier V101A and VIO1B and variable
submitted on DA Form 2028 (Recommended Changes
amplifier V103A and V103B increase the input signals
to Publications and Blank Forms) and forwarded direct to
from the tone generator to suitable out- put levels for
Commander, US Army Electronics Command, ATTN:
limiting.
DRSEL-MA-Q, Fort Monmouth, NJ 07703.
d. Limiters. Limiters CR101 and CR102 and
CR103 and CR104 function identically within their
NOTE
respective channel circuits. They symmetrically limit the
For applicable forms and records,
upper and lower peaks of the input signals.
e. Detector Driver. Detector driver V104A
828-12.
functions to amplify the output of limiter CR103, CR104
to drive the ratio detector-discriminator.
1-2.
Indexes of Publications
f. Ratio Detector-Discriminator.
The ratio
detector-discriminator consisting of discriminator network
a. DA Pam 310-4. Refer to the latest issue of
Z101 and diodes CR105 -and CR!06, demodulates the
DA Pam 310-4 to determine whether there are new
30-cycle voltages for the omni signal circuit, and the 90-
editions, changes, or additional publications pertaining to
and 150-cycle voltages for the amplitude localizer circuit
the equipment.
from the signals generated by the tone generator.
b. DA Pam 310-7. Refer to DA Pam 310-7 to
g. 90- and 150-Cycle Filter Networks. The 90-
determine whether there are modification work orders
and 160-cycle filter networks, Z102 and Z103, are
(MWO's) pertaining to the equipment.
bandpass filters for the amplitude localizer circuit and
1-3.
Block Diagram Analysis
h. -Cycle Filter Network. The 30-cycle filter
The AN/ARM-5A is a signal generator which provides
simulated omni and amplitude localizer signals for testing
vhf navigational receiving equipment in the 108- to 132-
Change 1 1-1