Yaesu FT-101ZD Instruction Manual page 32

C OUNTER UNIT (PB- 1 978, PB- 1 979, PB- 1 980)
The premix lo cal signal from the PREM IX LOCAL
circuit is fed t o amplifier Q230 1
ed on PB- 1 9 8 0 . The amplified signal is then fed to
waveshaper Q2 3 02
(MC l O l 1 6 ) .
acts as an interface between Q2302 and the TTL
circuitry . The signal is then fed to the counter gat e ,
Q 1 3 0 4 ( SN74 SOO N ) .
The clock pulses are
which produces a 6 5 5 . 3 6 MHz signal .
(MSM 5 5 64 ),
The sign al is divided by a factor of 2
a 5 Hz sign al which is fed to the counter gate.
The pulses which pass through the gate are fed to
d e cade counter Q2309
1 0 Hz digits. In turn , Q23o2 - Q23o 7
count 1 00 Hz, 1 kHz, 1 0 kHz, 1 00 kHz, 1 MHz,
and 1 0 MHz digits . The BCD output signal from
Q23o2 - Q130 7 is fed throu. g h drivers Q22o s - Q 1 2 1 3
(MSM 5 6 1 ) t o the display digits , DS2 1 0 1 - DS2 1 06
(HP 5 082-7623 ) .
The system o f presetting the counter can best b e
e xplained by e x ample . F o r a frequen cy o f 3 . 5 00
MHz LSB, the premix lo cal frequen cy is 1 2 . 4 8 6
M H z . The L S B preset code i s 9 1 .0 1 4 . 0 . 1 2 .486
+
9 1 .0 1 40 . 0 1 03 . 5 0 0 . The " l " digit on the left­
=
hand side is dropped (overflow), and the "O"
p receeding the "3 " causes a blanking signal to be
sent to the 1 0 MHz digit . The result is a frequency
o f 3 . 500 MHz , and this number is displayed .
N o m i n a l P r e m i x
L o c a l F r equency
1 6 0m 1 0 . 4 8 7 5 - 1 0 . 9 8 7 5 ( M H z )
1 2 . 4 8 7 5 - 1 2 . 9 8 7 5
80m
1 5 . 9 8 7 5 - 1 6 . 4 8 7 5
4 0 m
20m 2 2 . 9 8 7 5 - 2 3 . 4 8 7 5
1 5m 2 9 . 9 8 7 5 - 30 . 4 8 7 5
36 . 9 8 7 5 - 37 . 4 8 7 5
l Om A
l Om B 3 7 . 4 8 7 5 - 3 7 . 9 8 7 5
3 7 . 9 8 7 5 - 38 . 48 7 5
l Om C
3 8 . 4 8 7 5 - 38 . 9 8 7 5
l Om D
lo cat­
( 3 SK5 1 -03 ) ,
Q 1 303
(MP S3 640)
generated by Q23os
1 7
, producing
( SN74 1 96N), which counts
( SN74LS 1 96N )
L S B
1 0 . 4 86 - 1 0 . 9 86 ( M H z )
1 2 . 4 86 - 1 2 . 9 8 6
1 5 . 9 86 - 1 6 . 4 86
22 . 9 8 6 - 2 3 . 4 8 6
2 9 . 9 86 - 30 . 486
36 . 9 86 - 3 7 . 486
3 7 . 486 - 3 7 . 9 86
3 7 . 9 86 - 3 8 . 486
38 . 4 8 6 - 38 . 9 86
For USB, the p reset number is 9 1 .0 1 1 .0. F or a
frequency of 1 4 . 000 MHz USB, the manipul ation
is as follows : 9 1 .0 1 1
1 1 4.000. The first digit is the overflow digit , and
=
the remaining digits are displayed. Note that the
second digit from the left is not zero , so no b l ank­
ing signal is sent to the 1 0 MHz digit .
For a CW frequen cy of 2 1 .000 MHz, the p remix
frequency is 2 9 . 9 8 83 , and the preset frequen cy is
9 1 . 0 1 1 . 7 . The manipulation is : 9 1. 0 1 1 . 7
1 2 1 . 0000 . The first digit is d ropped , and the
=
remaining digits are displayed .
The preset frequencies are programmed
and Q230 8
(µ PA54H )
D23 1 2
( 1 S 1 5 5 5 ) .
definition of the premix frequen cies for the various
bands.
The 5 volt supply is regulated b y Q2310
for the TTL circuitry . The DIM control
1 4 3 05 )
controls the emitter/colle ctor voltage at Q220 1
( 2SA496Y ) , to control the brightness o f the
digital display and lamps.
l O M H z l M H z
( Q z 2 0 7 ) ( Q2 2 0 5 ) ( Q z 2 o s ) ( Q z 2 o d
9
L S B
1
U S B
9
1
c w 9
1
U S B
1 0 . 489 - 1 0 . 9 89 ( M H z )
1 2 . 4 8 9 - 1 2 . 9 8 9
1 5 . 9 89 - 1 6 . 4 89
2 2 . 9 8 9 - 2 3 . 4 8 9
2 9 . 9 89 - 30 . 4 8 9
3 6 . 9 8 9 - 37 . 4 8 9
3 7 . 4 89 - 37 . 9 8 9
3 7 . 9 8 9 - 38 . 4 8 9
3 8 . 489 - 38 . 9 8 9
Table 5
- 3 0 -
+
2 2 . 9 8 9 (Premix freq . )
+
and d iode m atrix D 2 3o6 -
Please refer t o Table
l O k H z l k H z
l O O k H z
( Q 2 2 0 3 ) ( Q22 0 2 )
0
1 4
0 1
1
0
1 1
Preset Number
, Table 4
c w
1 0 . 4 8 8 3 - 1 0 . 9 8 8 3 ( M H z )
1 2 . 4 8 8 3 - 1 2 . 9 8 8 3
1 5 . 9 8 8 3 - 16 . 4883
2 2 . 9 8 8 3 - 2 3 . 4 8 8 3
2 9 . 9 8 8 3 - 3 0 . 4 8 8 3
3 6 . 9 8 8 3 - 3 7 . 4 8 8 3
3 7 . 4 8 8 3 - 37 . 9 8 8 3
3 7 . 9 8 8 3 - 3 8 . 4 8 8 3
3 8 . 4 8 8 3 - 3 8 . 9 8 8 3
2 9 . 9 8 8 3
by
Q230 7
5
for
(µ PC
l OOH z
0
0
7