-- o ICOM

I
switch, with one spare contact set. A reed
relay is used for keying. You could also operate
this rig on 80 meters after selecting the
appropriate VFO and CIO frequencies and
changing the appropriate coils.
KIT Alignment
Alignment is con ventional except for the
RIT (Figure 81. which must be set up as
follow s to compensate for the frequency difference
between the two CIO crystals:
I. Using an external receiver with 00 aerial
connected , and a signal source such as a crystal
calibrator, switch the transceiver to
"rend" and zero beat it with the signal
source.
2. Switch the transceiver to receive, then
use the RIT control to zero beat it with
the signal source. Carefully mark the setting
of the RIT control on the front panel of
the transceiver so that it can be accurately
repealed.
3. When searching the band , do so with the
RJT control ser to this mark. Ifi t is required to
net on to another station, tune 10 zero beat.
then off-set the RTf control to give the required
beat OOIe. After a QSO or an unsuccessful
call. always reset the RJT control to
its zero mark in readiness 10 zero beat with
the ncxt station 10 be called.
So what's the best OX so far with this rig?
A VK answered a CQ from G3YCC-you
can't get too much further than that!m
. 1 2~ Rx
~' ll
......" 9MHz
I'-
.eo
'"
,r!'
5.6 1(
0,~5 e.F
.FC
;'I---AF,
2.5mH
a
BCI01 BCl 01
0 0 1
.v. ~'ll , > ...-
1
Sl612
0 .
"
0 0 5
...A •
, 0 .01
'"
O,?I
, I---CIO,
; :::;: 22pF ; 22pF
'00
" "
,
2. 1 K
6.ril
2 .1K
" " "
FIgure 3. Receivefiller. IF, and product detector.
'"
.eo
2.11(
12V;IR~J
.FC
.,. 2. 5 mH
~ 9 M H l
= 9 MHl "
BCI09
use
~O C4 5 . e tc.
use
1°°'
41pF
'f---
.,.
l?pF
r--PR OOUCT
I I DETECTOR
.FC
2 .SmH
401
4 bl
'"
33pF
'"
0 .02
Figure sab. What 's in th ~j unk-box? Pick between two receive carrier
circuits.
1°'
"0 "0
KE YED 12Y Chi
ON
" 0
f BPF
+ l 2 ~ T~
LI • P Rl, 6T , SEC. 21
l 2' 1ST 22SWG ON
11 2 in. 0 TOROI D 47pF L2 T- 68- 2 TOROI D
6BpF;
'OOK
"
2N3819
10nF
s:
~ 9 M H l ; 68pF
LSe
LI
,2['... z
'I
• P.A.
Sl 610C
MDI08
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W
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.
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