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Page Title:
Table 2-6. Low Frequency pahse Lock (U5) |
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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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