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ICOM IC-756PRO II - TX EXPAND MOD


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ICOM IC-756 Pro2 is popular HF+6m band transceiver. It can receive from 30 kHz up to 60 MHz continuously and transmit all mode, all bands with 100 watts RF power output. Transmitter is factory limited to transmit on amateurs bands only. This modification allows transmitter to transmit on whole frequency range.

Procedure:

Place the transceiver on the table with face toward you, upside down. Remove bottom cover.

ic756_mk_small

(click on the picture above to view it in high resolution)

 

There is DSP-unit (plug in metal box) on the right side. Carefully unplug DSP-unit and place it aside:

ic756_dsp_small

(click on the picture above to view it in high resolution)

 

dsp_removed-eng-small

(click on the picture above to view it in high resolution)

 

After removing the DSP-unit, you can see the SMD diodes which have to be removed. Look at pictures below:

bafore_mod_smal

(click on the picture above to view it in high resolution)

 

The place where diodes which have to be removed are on PCB under DSP-unit. Carefully (using a magnifying glass) you should remove the diodes located at the PCB as shown on the picture below:

bafore_eng_smal

(click on the picture above to view it in high resolution)

 

Diodes are very small, therefore this procedure should be done with great care

after_eng_small

(click on the picture above to view it in high resolution)

 

Here you can see how small are those SMD diodes:

ic706_7

(click on the picture above to view it in high resolution)

 

After you have removed diodes as shown on above pictures, return the DSP-module, return the botom cover into its place and turn on the transceiver. It will restart automatically and voila! The transmitter is "unloicked" now, and will be able to transmitt on all frequencies from about 0.5 to about 60 MHz continuously. Of course, transmitting outside the amateur frequencies are not allowed neither for licenced radio amateurs!

You should be aware of the fact that transmitter is set to transmitt on amateur bands only (band-pass filters), so transmitting outside of those frequencies have to be with limited power only, or you can easily demage the transmitter!


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