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TM 11-5820-919-40-1
LOW
FREQUENCY
PHASE
LOCK
(U5)
Input
Pin
Control  Panel
output
22
17
Frequency  kHz
21
20
19
18
16
0.09XY  MHz
23
X.Y
0.090XY
0
0
0
0.0
0
0
0
0
0
0.0900
1
0
0
0
0
0
0
0.1
0.0901
0
0
0
0
1
0
0
0
0
0.2
0.0902
0
1
0
0
0.9
0
1
0
0.0909
0
1
1
0
0
1
1.9
0.0919
0
0
0
0
0
0
1
1
0
0.0925
1
2.5
0
1
0.0999
1
1
0
0
9.9
0
0
1
0 = gnd
X is the l-kHz digit and Y is the
100-HZ
digit
on
the
control
panel.
1 = open (+12v pullup)
The effect of the
Prescaler.
0011  (correspondeng  to  30  kHz  on  the
control  panel),  prescaler  U4  pulses  1:11
prescaler  U4  is  to  divide  the  6.91-34.90
four times and by 1:10 for the rest of
MHz signal by ten and to cancel out the
the  frequency  input.
It pulses 1:11
10-kHz  digit  setting  from  the  LO.  TO
again  four  times  when  it  receives  a
cancel  out  the  10-kHz  digit  setting,
Reset  Pulse  from  the  high  frequency  loop
prescaler U4 divides by either 10 or 11;
filter  U2.
The  system-level  effect  of
that is, it pulses out once for every 10
the  10  versus  11  divisions  is  explained
Table  2-7  summarizes
or 11 pulses in.
For example, If
the  input  and  output.
the  bcd  Frequency  Selection  Logic  is
PRESCALER
DIVISION
CODE
No. of 1:11 Pulse Ratios.
Input : Pin
The  Remaining  Pulse  Ratios
10KHZ  Digit
are all 1:10
on  Control  Panel
19
18
20
21
0
1
0
0
0
0
1
2
0
1
0
0
3
2
0
0
1
0
4
3
1
1
0
0
4
5
1
0
0
0
5
6
1
0
1
0
6
7
1
1
0
0
7
8
1
0
1
1
8
9
1
0
0
0
9
10
0
0
1
1
1 = open (+12v pullup)
0
= gnd

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