G R I D C I R C U I T
P L A T E C I R C U I T
'
B A N D
C O I L
C A P A C I T O R
T R I M M E R
C O I L
C A P A C I T O R
T R I M M E R
1 60
C 1 2 9
820P
T C 28
C 1 3 0
820P
T C l O
80
T 1 0 2
+
T 1 0 6
C 4
200P
T C l
T 1 0 3
+
T 1 0 5
C 9
200P
T C 6
4 0
C 5
30P
T C 2
C 1 06
3 0 P F
T C ?
20
C 6
5 0 P F
T C 3
C l O
5 0 P F
T C 8
1 5
T 1 02
T C 4
T 1 0 3
C 1 0 7
l O P F
T C 9
1 0
T C 5
1 2 BY7 A T U N I N G C H A R T
Control the signal generator output and adj ust trimmer
TC15 for maximum audio output as described in step 2 .
( 5 ) Repeat step 1 . 2 . 3 and 4 t o peak out the coil
adj ustments for the 10 meter band.
( 6 ) Set the BA N D sw itch to 15 . the VFO to 2 1 .000
K Hz and the PR ESELECTOR to the lower edge of
the 15 meter segment. Tune up the transceiver to
2 1 .000 KHz as described above. Adjust trimmers
TC4 and TC9 for maximum t ransmitter output
into the dummy load.
TX 2NO M I XER
RX RF AMP
I
t
-
-
,
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L
ITl02
S l f
1
0
T I (, �_.
r-���
1 60
J J Y/11/ WV
-
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V1
1 2 B Y 7 A
( 7 ) Set the OPE R A T ION sw itch to the receive mode.
and w ithout changing the VFO or PR ESELECTOR
setti ngs. Tune the RF signal generator to 2 1 .000
K H z
and obtain the 1 .0 0 0
H z
beat note. A dj u st
trim mer TC1 4 for maximum aud io output as des
cri bed i n step 2 .
( 8 ) Repeat the procedu res given i n step 6 a n d 7 on
the 20 meter band. The trim mer TC3 and TCS
are u sed for maximum transm itter output and TC1 3
for maximum audio output i n receive.
I
300V
...L c ,
;I
1 2 B Y 7 A T U N I N G C I R C U I T
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