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BAND OPERATING FREQ MATRIX CIRCUIT LOCATION CONDITION
---- -------------- ----------------------- ---------
28 Mhz 28 - 40 Mhz Remove D33 (3-B) RX Only
Remove D33 (3-B) & TX/RX
Install Diode at 3-A
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50 Mhz 40 - 54 Mhz Remove D32 (4-B) RX Only
Remove D32 (4-B) & TX/RX
Install Diode at 4-A
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144 Mhz 138 - 174 Mhz Remove D27 (1-D) RX Only
Remove D27 (1-D) & TX/RX
Install Diode at 1-C
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220 Mhz 216 - 236 Mhz Remove D26 (2-D) RX Only
Remove D26 (2-D) & TX/RX
Install Diode at 2-C
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440 Mhz 420 - 470 Mhz Remove D25 (3-B) RX Only
Remove D25 (3-B) & TX/RX
Install Diode at 3-C
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1200 Mhz ------------- -------------------- -------
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Diodes are 1SS-211 or any high quality
silicon signal diode Matrix is located at display-B of EX-601 remote
controller.
D36 D32 D28 D24 D20 D16 D12 D8 4
D37 D33 D29 D25 D21 D17 D13 D9 3
D38 D34 D30 D26 D22 D18 D14 D10 2
D39 D35 D31 D27 D23 D19 D15 D11 1
A B C D E F G H
All changes are made in the control head.
Diodes are arranged in a 8x4 array: A-H, 1-4.
As shipped from the factory, the diodes are arranged thusly:
X = diode in place
____________________________________
| | X | X | | | | | X | 4
|---|---|---|---|---|---|---|---|---
| | X | | X | | | | | 3
|---|---|---|---|---|---|---|---|---
| | X | | | | X | | X | 2
|---|---|---|---|---|---|---|---|---
| | | | | | | | X | 1
|---|---|---|---|---|---|---|---|---
| A | B | C | D | E | F | G | H |
To add receive coverage on 6 meter and 70 cm
bands only:
C=cut diode, or remove
____________________________________
| | C | X | | | | | X | 4
|---|---|---|---|---|---|---|---|---
| | X | | C | | | | | 3
|---|---|---|---|---|---|---|---|---
| | X | | | | X | | X | 2
|---|---|---|---|---|---|---|---|---
| | | | | | | | X | 1
|---|---|---|---|---|---|---|---|---
| A | B | C | D | E | F | G | H |
440 Band - to expand coverage from 420 - 470
MHz:
Remove diode D25 (3,D) for RX
Install diode in (3,C) for TX
VCO in 440 module covers a 20 MHz range - re adjust as needed.
220 Band - to expand TX coverage from 216 - 236 MHz:
* This mod hasn't been tried and verified. *
Install diode (1,C) for TX
Remove diode (2,D) - ?
144 MHz Band - to expand TX coverage from 138 - 174 MHz:
Install diode in (1,C)
50 MHz Band - to expand coverage from 40 - 54 MHz:
Remove diode D32 (4,B) for RX
Install diode in (4,A) for TX
28 MHz Band - to expand coverage from 28 - 40 MHz:
Remove diode D33 (3,B) for RX
Install diode in (3,A) for TX
Mobile extender (cross band link) operation:
Install a diode in position (1,A) in the control head.
Open the Interface A unit, and look for two switches near where the
optional tone and digital squelch boards go.
(next to the "option 1" space" Put these two switches in position 2,
then reassemble unit.
To operate as a cross band link:
Set radio in VFO mode, and select frequencies (simplex mode) in the
two bands of interest, then turn on the "lock" switch on the side of
the control head. The "lock" indicator on the LCD display should
blink.
A signal received on band 1 will be repeated on band two, and vice
versa. For example:
223.500 MHz <======> IC900 <======> 146.520 MHz
The frequencies on the display will swap back and forth depending on
the frequency being transmitted at the time.
------> IC900 Modification Corrections <-------
#: 79969 S7/Vendor Support
16-Aug-88 23:54:53
Sb: IC900.MOD Correction
Fm: Larry A. Bronstone 72667,3201
To: sysop (X)
I just downloaded the file IC900.MOD and noticed a few errors.
- On the 220 band install a diode at 2C not
1C (1C is for the 144 band).
- The diagram showing the stock matrix
layout has a diode at 2H. The diode is actually at 3H. As a point of
clarification
removing diodes 4B, 3B and 3D gives maximum
receive coverage on all bands. The diode that ICOM uses on their
matrix board is 1SS211. The matrix is inside the REMOTE CONTROLLER
along with all of the memory settings. MINI-REPEATER instructions
(addition of diode 1A on matrix and (S1 & S2 both in position 2 -
interface unit A).
- Both frequencies in the MAIN and SUB bands
must be in the SIMPLEX mode.
- The LOCK switch acts as the repeat on/off
switch. With the LOCK switch activated, the LOCK indicator will
flash.
- When a signal is received on the SUB band
it will be retransmitted on the MAIN band. If a signal is received
on the MAIN band, the unit will reverse the MAIN and SUB
frequencies, then retransmit on the MAIN band.
- If either of the band units have DUP
activated, the LOCK switch will function as normal. The LOCK switch
disables the front panel controls when activated even in repeater
mode.
- The MINI-Repeater operation will also
operate if the optional tone units are installed, however, both
bands to be used in the Mini-Repeater operation MUST have the option
installed and activated.
|
KB2LJJ
