Icom IC-7200 Instruction Manual - Page 102

Band Voltage Modification

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18 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] connector 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 responsibility. Icom does not guarantee this modification's result. CAUTION: Disconnect the DC power cable from the transceiver before any work on the transceiver.­ IC-7200's bottom view with RF unit bottom cover is opened. Front panel Bridge these solder pads q BAND • Band voltage generator circuit The below circuit is just for reference. ACC socket of an optional unit GND 7 6 3 1 5 24 8 V 4700 pF External power souce 8 V 100 µH 1.9 MHz VR 4.7 kø 3.5 MHz Rotary switch BAND Diode 100 µH 4700 pF 4.7 kø 4700 pF VR 4.7 kø 7 MHz Open 10 MHz VR 10 kø 14 MHz VR 10 kø 18/21 MHz OR 22 kø 24/28 MHz w 8 V The following band voltage table is for reference only. Please adjust and confirm against the actual operating condition. BAND 1.9 MHz 3.5 MHz 7 MHz 10 MHz 14 MHz 18/21 MHz 24/28 MHz VOLTAGE Non-adjustment 6.1 V 5.1 V Non-adjustment 4.1 V 3.1 V 2.1 V 97

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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