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Figure 4-3. Method of holding crystal
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TM-11-5820-554-12 Radio Set AN/FRC-93(V)1 AN/FRC-93(V)2 AN/FRC-93(V)3. AN/FRC-93(V)4 AN/FRC-93(V)5 AN/FRC-93(V)6 AN/FRC-93(V)7 Manual
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Section III. OPERATOR'S MAINTENANCE INSTRUCTIONS


TM 11-5820-554-12
CHAPTER 5
Q-MULTIPLIER/NOTCH FILTER
Section I. INTRODUCTION
NOTE
The Waters Q-Multiplier/notch filter was originally purchased and installed in
the RT718/FRC-93 transceivers for use in Europe. This item is no longer in the
supply system for replacement; however, the information in this chapter is
retained to provide maintenance information for those which are still in use.
Multiplier/notch filter is greatest in the rejection of
5-1. Description
heterodynes, it is also useful in rejecting all types of
a. The Q-multiplier/notch filter (Waters 340-A),
interfering signals such as continuous wave (cw),
hereafter referred to as the Multiplier/notch filter, is
amplitude modulation (am.), and single sideband
designed to increase the operating capacities of
signals (ssb) that are close to the desired signal.
Receiver-Transmitter RT-718/FRC-93 by providing the
c. The mechanical design of the Multiplier/notch
ability to tune out interfering signals.  It provides
filter when installed in the Collins KWM-2/2A will not
facility for simultaneous fixed-station use of the
detract from the equipment's original appearance or
external permanently tuned oscillator (pto) (Collins
electrical performance.
It may be installed in
312B-5) together with the Multiplier.
approximately 1 hour.
b. The Multiplier/notch filter operates at 455 kHz
2.6 Hz. Its tunable notch depth is 40 db at any point in
the entire IF passband. While the usefulness of the
5-2. Items Comprising an Operable Q-Multiplier/Notch Filter
NSN
Item
Qty
5915-00-911-2333
Filter, band suppression kit w/attached coaxial cable 94603; Q-multiplier/notch filter (Waters 340-A) ...................... 1
Capacitor assembly group; MSA-B-340-26 (including MSA-B340 1 and MSA-B340 41); 94603 ............................ 1
Filter assembly MSA-B34-10; 94603 ............................................................................................................................ 1
Installation kit group: type 340-A; 94603 ..................................................................................................................... 1
5960-00-166 7664
Electron tube 12AX7, 81349 ........................................................................................................................................... 1
Section II. OPERATION
c. Set the REJECTION TUNING knob (outer
5-3. Adjusting Q-Multiplier/Notch Filter
knob) at 12 o'clock. The capacitor plates will be at half
a. Turn the new inner knob to ON.  Allow the
mesh.
transceiver to warm up for 10 minutes.
d. Tune the vfo dial to 1.1. kHz lower frequency
b. Turn the inner knob to CAL, the EMISSION
than zero beat. The tone in the speaker will be 1.1 kHz.
switch (on Collins KWM-2/2A) to USB, and tune the
e. Two null positions may be found when adjusting
vfo dial to a crystal calibrator frequency; for example,
the tuning screw in L1. Use that position found when
4.000 MHz. Set the AF GAIN control to maximum,
the screw is turned ccw and is farthest out. Rotate the
and the RF GAIN control between 3 and 5 o'clock.
tuning screw slowly for a null at 1.1 kHz. tone.
1
Change 5
5-1


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