G3TSO Homebrew
A Simple Hands Free Microphone
for mobile use using a telephone headset
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The Switchbox and Microphone Lead |
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FT817 with Mobile Mic and Switchbox  |
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Switchbox with Gain Control fitted |
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Modified Switch Box with
1750 Hz Tone Unit and cheap headset
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This unit has been used
with the FT817; IC2100; FT7800 and TM-V71E
By careful adjustment
of the gain control, most vehicle road noise can be completely
eliminated
