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S-UNITS meter . . . . . . . . .
.
Noise pushbutton switch
(below S-UNIT meter)
RMT. A.G.C. control
(rear panel)
MIX-BAL. control.
(rear panel)
3.2
USE OF CONTROLS
3.2.1
BAND SELECTOR SWITCH
Indicates accuracy of tuning and
relative strength of received
signals.
Meter is calibrated in
S-units from
1
to 9, and in de
cibels above S9
(0
to
+90
db).
Activates noise generator and
allows Receiver to be peaked for
optimum reception.
Adjusts remote AGC gain.
FSK
operation only.
Adjusts mixer balance.
This is a
maintenance adjustment and must not
be attempted by the operator.
The BAND selector switch permits the operator to cover the
six different frequency ranges of the Receiver.
This switch is
used in conjunction with the MHz preselector control to tune the
Receiver to a specific frequency.
(There is no preselector con
trol setting for the L band.)
Each band of the selector switch
is identified by a different-colored letter of the alphabet (A
thru E and L).
Settings of the MHz control are color-coded to agree
with the band selected.
In this manner, the operator immediately
knows the band he has selected and the approximate frequency setting
within that band.
If the desired frequency coincides with the dividing point
between bands, always choose the band which produces the higher s
meter reading.
3.2.2.
MHz CONTROL
The MHz control is a variable tuning control that peaks the
preselector tuning.
After a particular band is selected by the BAND
switch, the MHz control is adjusted to the approximate frequency
being used.
This control is inoperative on the L band.
Frequency
settings indicated on the control are not intended to pinpoint the
exact operating frequency, but they will narrow down the tuning un
til the operator can zero-in on the desired frequency.
The S-meter
is a valuable aid in peaking the MHz control.
3.2.3
S-METER
The S-meter provides a visual means of determining when the
MHz preselector control is properly tuned, as well as an indication
of relative signal strength.
To the experienced operator, the S
meter can provide valuable information about receiving conditions.
3-3
Summary of Contents for lSOOB1500B
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