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T.O. 31W2-4-206-2
TM 11-5805-622-14/1
1-20. POWER SUPPLY. The Full Mains Power
1-16. MATCHING UNIT. The Matching Unit TF1790
Supply TF610.9 provides power to the Supergroup
receives the orderwire signal from the channel
Amplifier, Pilot Amplifier and orderwire components.
modem and matches it to the input of the amplifier.
This supply also provides AC alarm voltages.
1-17. DIRECTIONAL COUPLER. The Directional
1-21. SUPERGROUP AMPLIFIER. The Supergroup
Coupler TF1788 separates the outgoing from the in-
Amplifier TF1971.7 occupies one complete shelf
coming orderwire signals. Incoming signals are fed
width of the bay, but consists electrically of two in-
to an amplifier at A terminal or through connection
dependent amplifiers each having a constant gain of
at B terminal. Outgoing signals are received from
20 db in the range from 312 to 552 kHz. For greater
an amplifier and passed to the output termination
redundancy each amplifier section has two parallel
point.
circuits. The gain for each amplifier section can be
adjusted from 18.5 to 21.5 db by means of special
strapping prior to inserting the unit into the bay. The
1-18. DELAY EQUALIZERS. The Delay Equalizers
in and output of each amplifier section is wired to the
of the Orderwire Delay Equalizer Bay consist of a
Bay Head, thus permitting the insertion at any desired
number of passive networks inserted into the as-
part of the Delay Equalizer portion of the bay.
signed shelves of the bay together with two units of
supergroup amplifiers. The SG Amplifier units con-
1-22, REFERENCE DATA.
tain four independent amplifiers, each providing ap-
proximately 20 db of gain. The number of delay
1-23. The data covering the characteristics of the
equalizer units for each terminal differs, since the A
Orderwire-Delay Equalizer Bay are tabulated on the
to B transmit direction requires more equalizer cir-
following pages. Table 1-1 lists the leading particu-
cuits than B to A. The supergroup amplifiers pro-
lars of the bay, Table 1-2 lists the capabilities and
vide the gain required to compensate for any insertion
limitations of the equipment, Table 1-3 provides data
loss introduced by the equalizers.
on the equipment supplied as part of this bay, Table
1-4 lists the test equipment necessary for mainte-
1-19. POWER SUPPLY, The Orderwire Power
nance of the equipment, Table 1-3 is broken down
into a dual listing to indicate the difference between
Supply TF1927.7 provides the required DC power for
operation of the orderwire components,
the Orderwire Equipment in Terminals A and B.
Table 1-1. Leading Particulars
Power Requirements -
Primary Power

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