Icom IC-3220H (IC 3220 H IC3220H) transceiver mods reviews software and diagrams

   
 
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Transceivers


Motorola

Icom IC-3220H (IC 3220 H IC3220H)
IC-3220H
Programming interface schematics for Icom:
Programming software for Icom IC-3220H (IC 3220 H IC3220H) :
PDF User Manual for Icom IC-3220H (IC 3220 H IC3220H) :Icom IC-3220H Instruction Manual
PDF Service Manual with schematics for Icom IC-3220H (IC 3220 H IC3220H) :

Mods for Icom IC-3220H (IC 3220 H IC3220H) :
    Icom IC-3220H (IC 3220 H IC3220H) How to iface Ic-3220 & G3RUH
    Icom IC-3220H (IC 3220 H IC3220H) Frequency expansion
    Icom IC-3220H (IC 3220 H IC3220H) mini repeater function

Icom IC-3220H (IC 3220 H IC3220H) technical specifications :  Icom IC-3220H (IC 3220 H IC3220H) technical specifications

Icom IC-3220H (IC 3220 H IC3220H) How to iface Ic-3220 & G3RUH

The following instructions tells you how to make the right connections to an ICOM IC-3220 in order to be connected to the G3RUH 9600 bauds modem.

WARNING !!

The following steps are not very dificult to follow, but are to be carried by a person with a minimum experience in electronic radio equipment.
If you are not such a person, ask to a friend with the required knowledge to do the job for you. Otherwise, permanent damage to your rig can result.!
Also, (evidently), this manipulation will invalidate the rig warranty, so perhaps you prefer to wait till the end of its validation period...
The author of this note is in no way responsible for any damage that can be caused to your equipment by doing this modification to it.
Do it at your own risk, and think twice before begin !

Modification instructions

(n) = Number of screws.
Material required: Screwdriver, Solder Iron, Coax cable (see text)

  1. Remove (4) the BOTTOM cover. (the one without the speaker).
  2. Remove (4+2) the shielding plate covering the P.A. output module.
  3. Remove (2) and discard the bottom small plate covering the hole behind the antenna coaxial cable. Restore the two screws in place, just to store it for the future.
  4. Locate connector J2 (The white big one, near to front panel) which is used to interface the two main boards. (16 pins).
  5. Locate pins 1, 2, and 15 of J2. Pin 1 is the nearest to the box side of the rig. Pin 15 (the one before last) is located about the middle of the main board.
    Pin description:
    1 - UHF TX stage modulator voltage input.
    2 - Ground.
    15 - UHF RX detector output.
    If in doubt about pinout, see schematic diagram (Main B unit, left hand)
  6. Take two pieces of SMALL diameter coaxial cable, (Z:50 ohms preferred by me, but ordinary AF coax cable will perform pretty well). Aproximate diameter MUST be no more then 4 mm, and lenght as required. Following Murphy's law be generous ...
  7. Join the two (outer) shield parts of coax cables and solder them to pin 2 (ground) at the upper (visible) part of J2. Solder the inner (active) part of one cable to pin 1 and the other to pin 15. Soldering should be performed to the upper part of J2 with EXTREME CAUTION, as the plastic support structure of J2 connector, can be seriously damaged !!!.
  8. Route the two cables trough the main board, up to the hole near the antenna cable, routing them in such a way, that traverses the small square hole at the bottom part of the plate covering the final P.A.
  9. Secure the cables at the output hole with a BIG plastic strap.
  10. Reinstall (6) the cover of final P.A.
  11. Reinstall (4) the bottom cover of the rig.
  12. Solder appropiate connectors at the other end of coax cables.
End of installation.
Notes:
With this modification, only the UHF part of the rig is affected, i.e. the mod will only work for the 432 Mc/s. band.
Also, some noise has been observed at RX detector output line, which make the DCD led of the TNC blink, but this does not affect the overall performance of the assembly.
As a guide, using the french TPK program, a serial (rs232) speed of 19200 bds, the well known G3RUH modem, and a standard TNC, a file of 1.5 Mbytes has been transmited in one hour, obtaining and average speed of 364 cps. (TPK measured).

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