PREMIX LOCAL UNIT (PB- 1 7 1 1 )
Crystal oscillators Q6o 1 - Q6 1 0
(2SC3 72Y)
generate
the p remix local signal at the frequencies shown in
Table
3 .
Diode swit ches D60 1 - D6 1 0
( 1 S l 5 5 5 )
select the proper lo cal signal for the band in use .
The local signal is then delivered to the PREMIX
UNIT .
x c o
P R E MI X O U T
Frequency
F r equency
1 60m
X 6 0 1
1 5 . 9 87 5 M H z
10. 487 5 - 1 0 . 9 87 5MH z
80m
X 6 0 2
1 7 .9 8 7 5 M H z
1 2 . 487 5 - 1 2 . 9 8 7 5M H z
4 0 m
X 6 o 3
2 1 . 487 5 M H z
1 5 . 987 5 - 1 6 . 4 8 7 5MHz
20m
X6o4
28 . 487 5 M H z
2 2 . 9 8 7 5 - 2 3 . 4 8 7 5M H z
1 5 m
X 6 o s
35.487 5 M H z
29. 987 5 - 30 . 4 8 7 5MH z
l O m A
X 6 o 6
42.4875MH z
36. 9 8 7 5 - 3 7 . 4 8 7 5MH z
l O m B
X 6 0 1
42.9 8 7 5 M H z
37. 4875-37 . 9 8 7 5M H z
l O m C
X 6 o s
43.4875MH z
37. 9 8 7 5 - 3 8 . 4 8 7 5M H z
l O m D
X 6 o 9
43.987 5 M H z
38. 487 5 - 38 . 9 87 5MH z
JJY/
X6 1 0
1 9 .487 5 M H z
1 3 . 987 5 - 1 4 . 4 8 7 5M H z
w w v
Table 3
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PREMIX UNIT (PB- 1 96 2 )
The premix signal is produced at Q303
( SN 76 5 1 4 N ) ,
a double-b alanced mixer, where the premix local
signal from Q601 - Q6 10 is mixed with the VFO or
crystal controlled 5 MHz signal . The premix output
frequen cies are shown in Table 3 . The premix
sign al is passed through b andpass filter T 3 0 1 - T 304 ,
and amplified by Q30 1
(2SK 1 9GR )
and Q302
(2SC373 ) .
The amplified signal is then fed to the
RF UNIT, where the signal is further amplified
by Q 1 0 7 for delivery to the transmitter and receiver
mixers.
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