G3TSO Homebrew
A Simple Hands
Free Microphone for use with a Telephone Headset
FT817
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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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IC2100 Switch Box with 1750
Hz Tone
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This unit is now in use with a
FT7800
