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Operation Outside Amateur Bands - TM-11-5820-554-120027
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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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Table 3-2. Crystal Frequencies and Operating Bands-continued - TM-11-5820-554-120029


TM 11-5820-554-12
frequency is half the sum of the lower edge of the
crystal mounting board and a front panel switch to
desired band and 3.155 MHz. For example:
allow selection of either board. The crystal-mounting
14.4 + 3.155 = 8.7775 MHz
board for extra-band operation is located on top of the
2
chassis.  If amateur band operation is not needed,
The plate circuit of the oscillator is tuned to twice the
extra-band crystals may be substituted in the crystal-
crystal frequency when required injection frequencies
mounting board under the chassis.  BE SURE the
are this high.
crystals  are  plugged  into  appropriate  sockets
according to table 3-2 and figure 3-6. The transmitter
CAUTION
Avoid transmitter operation between 5.0 and
can be operated at other frequencies outside the
6.5 MHz.
In this range, the second
specified amateur bands or at other 10-meter
harmonic of the variable IF is nearly the
frequencies by plugging the proper crystals into the
same as the desired frequency. In the
mounting boards. Mark the desired lower band edge
transmit function, some of this energy will
information on the white card in the BAND switch
pass through the tuned circuits and become
windows. Make sure this information is marked in the
spurious emissions.
appropriate switch positions.
(3) Plug substitute or extra crystals into the
b. Adjustment of Tubbed Circuits. For
appropriate socket on the mounting board according
operation outside amateur bands, disregard amateur-
to BAND switch position and total coverage columns
band markings on the EXCITER TUNING and P.A.
in table 3-2. The example given in (2) above calls for
TUNING scales and use logging scales (fig. 3-5).
placement of the crystal in one of the sockets marked
Operation at frequencies outside the amateur bands
C. If two additional 10-meter crystals are used, they
will result in slightly decreased receiver sensitivity and
must be plugged into the sockets marked E. Table 3-2
transmitter pa grid drive, unless the tuned circuits of
lists crystal socket designations, switch positions
the transceiver are retained to peak their responses in
(BAND), crystal frequencies, and frequency range
the desired portion of the high-frequency spectrum.
limitations. The KWM-2A is equipped with an extra
Table 3-2. Crystal Frequencies and Operating Bands
KWM-2/2A
Crystal
Operating frequency
frequency
(MHz)
(kHz)
Bandswitch setting 1A, 2A, or 3A
4.0 to 4.2 ------------------------------------------------------------------------------------------------------- 7155.0
4.2 to 4.4 ------------------------------------------------------------------------------------------------------- 7355.0
4.4 to 4.6--------------------------------------------------------------------------------------------------------- 7555.0
4.6 to 4.8 ------------------------------------------------------------------------------------------------------- 7755.0
4.8 to 5.0 ------------------------------------------------------------------------------------------------------- 7955.0
Bandswitch setting 1B or 2B
6.6 to 6.8------------------------------------------------------------------------------------------------------ 9755.0
6.8 to 7.0 ------------------------------------------------------------------------------------------------------- 9955.0
7.0 to 7.2. ------------------------------------------------------------------------------------------------------ *10155.0
7.2 to 7.4 ------------------------------------------------------------------------------------------------------- *10355.0
7.4 to 7.6 ------------------------------------------------------------------------------------------------------- 10555.0
7.6 to 7.8 ------------------------------------------------------------------------------------------------------- 10755.0
7.8 to 8.0 ------------------------------------------------------------------------------------------------------- 10955.0
8.0 to 8.2 ------------------------------------------------------------------------------------------------------- 11155.0
8.2 to 8.4 ------------------------------------------------------------------------------------------------------- 11355.0
8.4 to 8.6 ------------------------------------------------------------------------------------------------------- 11555.0
8.6 to 8.8 ------------------------------------------------------------------------------------------------------- 11755.0
8.8 to 9.0 ------------------------------------------------------------------------------------------------------- 11955.0
9.0 to 9.2 ------------------------------------------------------------------------------------------------------- 12155.0
9.2 to 9.4 ------------------------------------------------------------------------------------------------------- 12355.0
9.4 to 9.6 ------------------------------------------------------------------------------------------------------- 12555.0
See footnote at end of table.
3-12


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