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1994-01-10
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3KB
Date: Thu 9 Feb 89 12:02:25-PST
From: Brad Horak <BRAD@CSLI.Stanford.EDU>
Subject: Icom IC-900 mods
To: MBramwel@business.uwo.ca
Enclosed is a list of frequency range extension modifications for the IC-900.
They are courtesy of KB1MZ and KA1OKQ. Some mods may enable out-of-band
transmission. Transmitting there is ILLEGAL ! These radios are not type
accepted so therefore it is ILLEGAL to use this radio out of the ham bands
even if you have a license to do so. (ie volunteer F.D. etc). All mods
are done at your own risk. This is in NO way an invatation to break the law.
The mods are provided for information only..........................73
Gene
WA1UXA
<Standard Disclaimer Applies>
Subject: Icom IC900 mods
Frequency Expansion Modifications for the ICOM IC-900
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 recieve 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 D32 (3,B) for RX
Install diode in (3,A) for TX
-------