12-2
12
INFORMATION
Band voltage modification
■
If you want to connect an external unit that can be con-
trolled by the band voltage from the
[ACC] connector,
the modification is shown to the right.
The band voltage is on pin 5 of
[ACC] connector after
modification (
q
) is completed, or the regulated 8 V is
on pin 1 of
[ACC] connector after modification (
w
) is
completed.
Performing this modification is the customer’s re-
sponsibility. Icom does not guarantee this modifica-
tion’s result.
CAUTION: Disconnect the DC power cable from the
transceiver before working on the transceiver.
Bridge these
solder pads
IC-7200’s bottom view with
bottom cover removed.
RF unit
Front panel
q
BAND
w
8 V
• Band voltage generator circuit
The circuit below is just for reference.
1.9 MHz
Rotary
switch
Diode
VR
4.7 k
ø
4.7 k
ø
4.7 k
ø
100 µH
100 µH
4700 pF
4700 pF
4700 pF
BAND
8 V
8 V
External
power souce
ACC socket of
an optional unit GND
10 k
ø
10 k
ø
22 k
ø
VR
Open
VR
VR
OR
3.5 MHz
7 MHz
10 MHz
14 MHz
18/21 MHz
24/28 MHz
1
2
3
4
7
6
5
The following band voltage table is for reference only.
Please adjust and check with the actual operating re-
sults.
BAND
VOLTAGE
1.9 MHz
Non-adjustment
3.5 MHz
6.1 V
7 MHz
5.1 V
10 MHz
Non-adjustment
14 MHz
4.1 V
18/21 MHz
3.1 V
24/28 MHz
2.1 V
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