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ICOM OPC-478 SERIAL PORT PROGRAMMING INTERFACE

 

I think this programming cable will program many different ICOM radios and possibly even a few Alinco radios. I used it for my ICOM  IC-208H.

 

The Circuit Board Art Work     The Schematic     Bill of Mateial

 

 

The prepared bright and shinny copper circuit board material cleaned of all oxidation and oils. The reverse mirror image art work was done with MS Paint. It is then printed

out on glossy photo paper using a laser printer. For the best printing results, use MS Word rather then printing directly from MS Paint. 

 

*** News Flash! ***

I have now started to use a different light weight glossy photo paper to transfer the toner mirror image to copper. It's very light weight at 120 g/sm and glossy on both sides.

Also, it's A4 in size at 216mm x 279mm (8" x 11")  and made by Hewlett-Packard, Product No. CG988A.  *** THIS IS THE PAPER TO USE !!! ***

It's like glossy thin magazine paper. Hewlett-Packard call it "Presentation Paper".

The art work and copper after going through the hot laminator10 times.

 

The art work and copper before filling up the laundry sink with hot water.

 

The art work and copper after a 2 hour soaking in hot water.

 

The art work and copper after the glossy photo paper has lifted.

 

The copper with the computer toner art work in the Ammonium Persulphate solution.

 

The circuit boards after etching. This is after 10 minutes in the hot 70 degree Celsius Ammonium Persulphate solution.

 

One of the circuit boards with the printer toner removed. I use a paper towel with Turpentine to scrub the toner off. After the toner has been remove, a good wipe down

with alcohol to remove the turpentine. The circuit board is then trimmed to size and drilled with .7mm holes. Any larger holes for the green edge connectors are drilled

with a 1mm drill bit. The slots for the 90 degree DB9, 9 pin female serial connector were drilled with a 1.2mm drill bit. 

 

A top view of the circuit boards before soldering.

 

A bottom view after all the parts have been soldered and the excess flux removed with an old tooth brush and alcohol.

 

The completed OPC-478 serial interface board. I tested the board on my ICOM IC-208H VHF/UHF rig using a serial to USB adaptor and my small EeePc netbook

computer. You will need to make up a lead with a 3.5mm stereo audio. See the drawing at the top of this page.

Tested with no issues, worked first time!

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