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Page Title:
Section III. DETAILED FUNCTIONAL DESCRIPTION |
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|  TM
11-5820-919-40-1
SECTION
III
DETAILED FUNCTIONAL
DESCRIPTION
RECEIVER/EXCITER.
Select signals are applied to the har-
monic filters to select the proper band-
pass filter for the operating frequency.
CONTROL
PANEL
A frequency change (AF) signal is gener-
ated each time a new operating frequency
General.
The control panel con-
tains the operational controls of the
is selected.
The AF signal indicates to
the modulator/demodulator that a new fre-
radio set.
Audio input/output connec-
tors J1 and J2 are also provided to per-
quency has been selected, initiating a
tune start to the antenna tuner and the
mit connecting audio devices selected by
synthesizer.
The control panel pro-
the operator.
vides the following controls.
Fre-
Frequency Select Signals.
(right
quency Select signals for 100 Hz, 1 kHz,
FREQUENCY KHZ Switches
half of figure).
The FREQUENCY KHZ
10 kHz, 100 kHz, 1 MHz, and 10 MHz are
routed from the frequency select
switches S1 thru S6 produce a binary-
switches to the synthesizer.
The 1-
coded-decimal (bed) output which con-
and 10-MHZ signals are also routed to
trols the radio set operating frequency.
the antenna tuner which uses them in the
Bcd is a 4-digit binary code, where
automatic impedance-matching process.
0000=0, 0001=1, 0010=2, . . .., 1001=9.
Tables 2-1 and 2-2 list the bed logic
Frequency Select signals are sent to the
for FREQUENCY KHZ switches S1 and S2
synthesizer to determine the frequency
thru S6, respectively.
of the 75-105 MHz LO signal.
Filter
FREQUENCY
KHZ
SWITCH
S1
BCD
LOGIC
Output
Pin
Dial
B
c
A
2
1
x
Setting
nc
0
0
1
0
0
nc
1
1
0
1
1
nc
0
1
0
2
1
1 = +12V
=
0
gnd
-
=
normally
open;
momentarily
gnd
when
switch
is
changed
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