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Figure 1-3. Simplified four-wire reentrant switch and drive motor circuit
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TM-11-6625-601-34 Maintenance Kit Electronic Equipment MK-733/ARC-54 (NSN
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Table 1-2. Whole-Megahertz Coding
TM 11-6625-601-34
Table 1-1. 0.05-Megahertz Coding
switch S3 generates an ambiguity code to dif-
e. Whole-Megahertz Switching. Figure 1-2
ferentiate between them. To differentiate the
shows the complete TS-1967/ARC-54 frequency
30-megahertz frequency range from the 50-
s e l e c t i o n circuit. FREQUENCY SELECTOR-
megahertz frequency range, ground is applied
MC switches S3 and S4 perform the whole-
through contacts 8 and 4 of switch S3A (front)
megahertz tuning from 30 to 69 MHz. Switch
to megahertz ambiguity line A. Setting switch
S4 generates three sets of codes. One code
-
S3A
(front)
to
50
removes
ground
from
covers the 30- to 39- and the 50- to 59-megahertz
megahertz ambiguity line A and applies it to
frequency range. The second code covers the 40-
megahertz ambiguity line B. Setting switch S3
to 49- and 60- to 69-megahertz frequency range.
to 40 or 60 connects five lines from S4A and S4K
A third code identifies odd- and even-megahertz
to megahertz select lines A through E. To dif-
frequencies by applying alternate grounds to
ferentiate between the identical codes of the 40-
the odd- and even-megahertz lines. Sections B
and 60-megahertz frequency ranges, megahertz
a n d D of switch S4 form a five-wire code
ambiguity line B is grounded at position 40 and
generator for the 30- and 50-megahertz fre-
megahertz ambiguity line B is grounded at posi-
q u e n c y ranges.  A separate five-wire code
tion 60. Setting switch S4E (front) to an odd-
generator for the 40- and 60-megahertz fre-
position  g r o u n d s the
or  even-megahertz
quency ranges is formed by sections A and C
associated odd- or even-megahertz line.
of switch S4. Setting switch S3 to 30 or 50 con-
f. Whole-Megahertz Coding Table. Table 1-2
nects five lines from switches S4B and S4D to
megahertz select lines A through E. Since the
below lists the ground coding for the whole-
c o d e s for frequencies in the 30- and 50-
m e g a h e r t z switches.  A n X in the column
m e g a h e r t z frequency  ranges are identical,
indicates ground; a O indicates an open.
Table 1-2. Whole-Megahertz Coding
1-12

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