Band Voltage Modification - Icom IC-7200 Advanced Instructions

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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.
• Band voltage generator circuit
The circuit below is just for reference.
ACC socket of
an optional unit
GND
7 6
8 V
3 1
4700 pF
5 4
2
Diode
BAND
100 µH
4700 pF
4700 pF
4.7 kø
External
power souce
8 V
100 µH
Rotary
switch
1.9 MHz
3.5 MHz
VR 4.7 kø
7 MHz
4.7 kø
VR
10 MHz
Open
14 MHz
10 kø
VR
18/21 MHz
VR 10 kø
22 kø 24/28 MHz
OR
IC-7200's bottom view with
bottom cover removed.
Front panel
Bridge these
solder pads
The following band voltage table is for reference only.
Please adjust and check with the actual operating re-
sults.
BAND
1.9 MHz
3.5 MHz
7 MHz
10 MHz
14 MHz
18/21 MHz
24/28 MHz
12-2
BAND
q
RF unit
8 V
w
VOLTAGE
Non-adjustment
6.1 V
5.1 V
Non-adjustment
4.1 V
3.1 V
2.1 V