ICOM-706 MODIFICATIONS
From: n1ist
Keywords: ICOM 706 MOD MODIFICATION MODS
ICOM-706 MODIFICATIONS
As of Dec. 9, 1995
SUMMARY
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MODIFICATION 1: Enables extended transmit from 1.6 to 54 MHz inclusive. MODIFICATION 2: Enables extended receive from .05 to about 165 MHz inclusive.
CAUTION
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Improperly performed modifications can severely damage your radio.
Use extreme caution. Proceed at your own risk.
Transmitting on frequencies other than those assigned to the amateur radio service may be illegal.
TOOLS RECOMMENDED
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1)Small philips-head screwdriver
2)Magnifying glass
3)Small wattage (15 watt) soldering iron with a small tip
4)Long-nosed pliers
5)Paper clip
6)Tweezers
MODIFICATION 1
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Result of modification: The IC-706 transmits only on the ham bands. This modification allows for transmit on any frequency from 1.6 to 54 MHz. The radio will also continue to transmit on 2 meters (144
to 148 MHz in the United States) at 10 watts output. This modification will NOT allow for transmit on the AM or FM broadcast bands. The radio will appear to transmit on most frequencies above 54 MHz, but the power output will be a milliwatt or less. The highest power output will be
100 watts from 1.6 to 54 MHz (SSB, FM, CW; 40 watts AM) and 10 watts on 2 meters. (SSB, FM, CW; 4 watts AM) Note: This modification requires that you reset the CPU. All memory information will be
erased.
1)Disconnect the power cable. Open the TOP cover of the radio. You will need to remove only 5 screws: three on the top of the radio and one screw on each side. Pull up the speaker carefully and set it aside. Look at the radio from the front; the speaker area should be in front.
2)Locate the rectangular, silver 9 MHz SSB filter. This is clearly marked on the top of it. Now look to the right. Note the "D 108" marking. Below this marking, there are three tiny black diodes.
There are two diodes, followed by two blank sockets, followed by another diode.
3)The second diode from the left (the middle diode) is diode D-59. This diode needs to be removed. There are many ways to remove this diode. The easiest way is to crush it with long-nosed pliers. Another way is to use a low-wattage soldering iron and tweezers and carefully heat the diode, then pull with the tweezers. Be extremely careful not to apply too much heat.
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