TM 11-4625-486-14&P
EL 6625-486-14-TM-7
direction arrows, and typical checkpoints are shown in
3-3. Operating Procedure
The frequency meter uses two
a. General.
marks every 100 Hz, and minor calibration marks every
variable frequency oscillators (vfo) to cover the range
10 Hz. RANGE B has major calibration marks every 1
between 125 kHz and 1,000 MHz. In each range, the
kHz, and minor calibration marks every 200 Hz.
vfo covers, in fundamentals, only a portion of the
RANGE C has major calibration marks every 50 kHz
frequency range. RANGE A covers 125 to 250 kHz in
and minor calibration marks at 5 kHz intervals. Set the
fundamentals. The other frequencies (250 to 2.5 kHz)
dial to the desired frequency as follows:
are obtained by the use of harmonics of the vfo
frequency. RANGE B (2.5 to 5.0 MHz in fundamentals)
(1) Assume that a frequency setting of
and RANGE C (65 to 130 MHz in fundamentals) operate
235,240 Hz (235.24 kHz or 0.23524 MHz) is desired.
in a similar manner. The filmstrip is calibrated in
(2) Set the RANGE SW to RANGE A.
fundamentals only. By using the calibration tables (fig.
(3) Adjust the TUNING control until the major
calibration mark representing 235.2 is under the hairline
can he obtained.
indicator.
b. Setting Meter Dial to Desired Frequency. The
(4) Start from major calibration mark 235.2,
frequencies printed on the filmstrip are calibrated in
count four minor calibration marks upward, and set
kilohertz and hertz for RANGE A and RANGE B, and in
235.24 under the hairline indicator.
megahertz and kilohertz for RANGE C. All frequencies
represent fundamentals. Sections of filmstrip showing
major and minor calibration marks, crystal checkpoint
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