18
97
BAND VOLTAGE MODIFICATION
■
Band voltage modification
If you want to connect an external unit which can be
controlled by the band voltage from
[ACC]
connector,
the modification is necessary as at right.
The band voltage appears from pin 5 of
[ACC]
con-
nector after modification (
q
) is completed, or the
regulated 8 V appears from 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 any work on the transceiver.
Bridge these
solder pads
IC-7200’s bottom view with
bottom cover is opened.
RF unit
Front panel
q
BAND
w
8 V
• Band voltage generator circuit
The below circuit 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 confirm against the actual operat-
ing condition.
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
