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FT 817 HEADSET

For a comfortable HF pack operation is highly recommended a headset. You can consider home brewing a headset using a very simple circuit.

................FT 817 MIC. INPUT

PTT: PTT to GND (minimum requirement).
FAST push button: FAST to GND.
UP push button: UP to GND.
DOWN push button: DOWN to GND.

......CIRCUIT DIAGRAM

Resistors: 10K ohms and 4.7 K ohms
Capacitor: 1 micro farad Tantalum
Microphone element: electret.
Push buttons.

You must look for a headset that keeps the microphone in front of your lips to achieve a good signal to noise relation between your voice and the external noise.

You will need to adjust the microphone and the vox gain on the FT 817 to compensate the differences between the microphone manufacturers.

The cell phones headsets that have microphones far from the mouth can be used, but they needs higher gain level adjustments that can easily trigger the FT 817 vox

The speaker mini plug helps to keep the box faced to the operator.

One of my recommendations is to use a small rigid piece of wire on the microphone connector to keep it self supported.
The control box is used to accommodate the earphone connections.

 

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SELF SUPPORTED CONTROL BOX ...........CONTROL BOX: PTT and FAST................

 

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THE ULTRA LIGHT .....................................THE BIG ONE....



PY1 AHD ALEX (Alexandre Grimberg).