Operate IC-705 with a desktop microphone
IC-705 conversion cable for desktop microphone
icom ic-705 desktop microphone. I really enjoy using the IC-705, but I also wanted to use a mic other than the attached mic. I want to use a desktop microphone when operating at home for a long time, so I made a conversion cable that can be used with a microphone other than the HM-243 standard and verified its operation.
IC-705 MIC jack
The microphone jack of IC-705 has 4 poles, and the wiring is as follows when viewed from the plug side.
Of course, the HM-243’s MIC plug is also 4-pole, but if it is a speaker microphone that does not have a Key Output function, it seems that a conventional product with a 3-pole plug can also be used. When I connected the speaker microphone that was actually used for ID-51 and ID-31 to IC-705, I was able to confirm that it can be used normally.
Icom IC-705 conversion cable for desktop microphone
・ 8P metal jack for desktop microphone
・ Φ2.5mm 4-pole plug
・ Cable (2-core shield or 3-core)
・ Resistor (1kΩ×1, 3.3KΩ×1)
・ Capacitor (1µF×1)
If you connect a microphone other than the standard accessory to the IC-705, the UP / DN key on the stand microphone side will not work.
To use an Icom desktop microphone, you need to change the “MIC terminal 8V output” of the IC-705 to “ON”.
In set mode, change to [MENU]> [SET]> [External terminal]> [MIC terminal 8V output] → “ON”