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IC-207 and IC-207H
Modification Instructions
1 - Remove power and antenna
2 - Remove screws and open the case.
3 - Locate Main Unit
4 - Locate and Remove chip diodes D-117 and
D-118
5 - Cut jumper 14
6 - Add chip diode D-119 [ Full 800 Mhz
mod ]
7 - Reassemble the radio.
8 - You may be required to reset the microprocessor. ( See owners
manual )
73's CT1APV
| Clon software for Icom IC-207h |
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The
IC-207 Programmer is designed to
give you the ease and
convenience of programming the
memories and options of you
radio from your PC. Using the
Programmer, you can create files
for unique applications (travel,
Emergency activities, or special
events) containing various
settings, such as memories,
power management features, and
DTMF numbers. Alternately, you
can read configurations from the
radio, store these in files on
your computer and easily make
changes. Then, with minimal
button pushing, you can send the
new configuration back to the
radio.
Hardware Requirements
In
addition to a PC running
Microsoft Windows (3.1/95/98 or
NT), you need a free (one on
which a modem is not configured)
9-pin serial port on your PC and
the Icom OPC-646 Clone Interface
Cable. The cable connects the
radio to the computer between
the serial port on the computer
and the interface jack located
behind the face of the radio.
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| Band expansion for IC-207 |
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Remove the 4 screws attaching the bottom cover and remove the
cover. (I had to use a small screwdriver to pry on the cover. It's
made to fit tight) with face toward you and belly up look to far
right of board and close to you.
Locate a row of SMT diodes 3 on top then
a shift to right and a few more. The three are in a PERFECT row
top to bottom! count from the top of the row 1 2 3.
Remove the # 2 & 3 diodes. Now continue
looking down from there and you will see a resistor sticking up in
the air (W14). Clip the lead off of the resistor. Reassemble the
radio and perform a CPU reset by holding the Set and S.MW buttons
while turning the radio on...(page 69 of manual).
You now will have :
118-135 RX (stock)
136-174 TX & RX
320-399 RX (hmmm whats there? I've heard a local radio station DJ
at a remote location talking to the station)
400-479 TX & RX
849-950 RX
The Transmitter will work and transmit at
ALL of the listed TX freqs. and the power seems to be fairly broad
banded and can handle it... I now use my mobiles as Ham AND GMRS.
One less piece to lug around!
| User comment:
Icom 207H RX only Expansion |
This modification
will open up the RX coverage on the Icom 207H, while
preventing out of band TX. This is useful if you need UHF RX
coverage above and below 440mhz ham band.
Simply cut the lead on resistor W14 (refer to the photo of the
radio as submitted by others) Power up the radio, you do not
need to do a reset.
New RX coverage: 320-399.995 mhz Note: Holding the band button
down for a second while on this band, will change the detector
to AM mode as noted by a decimal point appearing the right of
the last digit. AM is used by Military Aircraft
communications. Latest band plan is 25khz channel spacing.
Coverage for UHF-FM is now 400.000-478.995
Simple Mod, no mess. Have Fun :) |
| User comment:
ic 207h |
On removing the #2
and #3 diodes in the circuit of the ic 207h for expansion, how
do you go about getting them out. Please help
PS cut w14 wire on resistor works great.
Thank you: Chickasaw |
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| Band Expansion for
IC-207H |
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Author: Mike VK2ZOC
When wanting to extend band TX for the
IC-207H, follow the instructions for the IC-207. The variation is
that there are only 2 diodes present, not the three described.
Remove BOTH of these. Also the resistor
sticking up in the air near W14 has already been clipped. Note
that these diodes are the surface mount type so be careful when
removing them.
Mike VK2ZOC
| User comment:
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| I've received a
large number of emails from the US asking how you get the
850-950MHz band.
The modifications described don't
give you extra bands that you don't already have. They remove
the restrictions to TX in the 140-179MHz & 400-479MHz bands on
the radio. Apparently radios from the US don't have the fifth
(850-950MHz) band.
Mike VK2ZOC |
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Regarding the IC-207H modification
(Australian version).
The mod opens up the mentioned bands, however there may
initially be a considerable delay in "keying up" the radio in
the 477 MHz band. The RF/S meter will flicker for a while
before the unit begins to transmit. The longest delay I have
witnessed to date was in the order of 15 seconds.
The remendy for this delay wass to reprogram the UHF CB
channels using a 12.5KHz step (two between channels). This has
reduced the delay to about half a second. |
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| IC-207H + Symek TNC2H (9K6 BPS) |
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Author: Mak SV1BSX
IC-207H works on 9k6, but needs many
"tips" to do it workable on 9k6 packet with Symek - TNC2H
- There is not enough to lights the DCD
led into TNC2H for decoding, in practice needs much stronger
signal to print on the screen of terminal program.
IC-207 has a very low demodulator output on DATA-out of
mini-Din, for this reason ICOM has a direct output without any
protection-resistor, from TA31136 IC demodulator. If you put a
resistor for protection (highly recommended !), the value of it
must be 10K or less, not 47K as Symek advises (47K is too high
for this RIG).
- Depend on low DATA-out of IC-207, you
must increase as high as possible the sensitivity of TNC2H. That
it can be by adding the R23 (1K2) into PCB of TNC2H and also by
replacing the R14 with a new resistor 10K.
This way increasing the sensitivity of TNC2H to 10mV. (see TNC2H
MANUAL page 8)
- The DATA-output of TNC can be drive
the IC-207 data-in, through a 10K resistor also (for
protection). There is not any problem on this stage, IC-207
accept the data easily, without problems.
If you haven't an oscilloscope to adjust the Vp-p into Data-in
Pin of IC-207 for 400mV pp, just "put" the trimmer into TNC2H >
to the middle position. Its very close to optimum driving value.
- Keep in mind, for 9600 Bps, IC-207
must be set on this data-speed by INITIAL SET MODE.
- Push the PWR to turn off.
- While pushing "SET", turn power ON
to enter INITIAL set mode.
- Push "SET" one or more times till "bPS"
appears.
Pushing "MON" reverses the order of selection.
- Rotate the tuning dial for 9600 bps.
- Push "PWR" momentarily to exit of
INITIAL mode.
Finally, IC-207 accept a TX-Delay no less
of 30, which is a very-large number of TXD for 9k6 Packet
operation! Lower TXD-value on TNC2H (with IC-207), in practice
generates an unserviceable signal on the air, which is non-decoded
from other receivers.
73 de Mak SV1BSX
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KB2LJJ