kopia lustrzana https://github.com/jamescoxon/dl-fldigi
63 wiersze
2.3 KiB
Plaintext
63 wiersze
2.3 KiB
Plaintext
/**
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\page w5zit_rt_channel_page Using the FLdigi Rt. Channel for transmitter PTT
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\tableofcontents
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This interface is designed to take advantage of the Right Speaker tone
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output in FLDigi for actuating the PTT. It is especially useful for
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interfacing a small notepad with minimal I/O capability to
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a radio. It has been my experience that complete ground isolation
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between a laptop and the radio (including eliminating any kind of rig
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control) provides the minimum QRM to the receiver from the laptop. The
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Headphone and Mic connections are the only computer connections
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necessary.
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The tone output is coupled through a transformer to maintain complete ground
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isolation between the computer and the radio. There is no external power
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required for this interface and an FET is used to provide the PTT output. I
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use transformers in both the audio input and output paths to complete the
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isolation.
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<br>
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Note that two of the transformers are wired to the single stereo jack
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from the Speaker output of the computer. The normal Left Speaker Output
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(TIP) is used to provide the modulating audio for the radio transmit
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input while the Right Speaker Output (RING) provides the tone output
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that drives the PTT circuit. The SHELL of the connector provides the
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return path for both signals.
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<br>
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Audio from the radio is supplied to the MIC input on the computer for
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demodulation by the FLDigi program.
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<br>
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Somewhat higher output from the computer is required to reliably operate
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the PTT circuit and the audio balance control in the computer is used to
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reduce the output to the radio to the level required for normal
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modulation. Since the right speaker tone output is not the same audio
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used to modulate the radio, no signal distortion is caused by the clipping
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action of the diode rectifiers used in the PTT circuit.
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<br>
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To configure FLDigi to use this interface go to
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(Configure/Rig Control/Hardware PTT) and check only the (PTT tone on right
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audio channel) box.
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<br>
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\image html W5ZIT-interface.png "W5ZIT Interface"
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\image latex W5ZIT-interface.png "W5ZIT Interface" width=6.0in
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<br>
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\image html w5zit-ts2000-interface.png "TS-2000 ACC-2 to DB9 Adapter"
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\image latex w5zit-ts2000-interface.png "TS-2000 ACC-2 to DB9 Adapter" width=6.0in
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<br>
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<br>
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\ref w5zit_rt_channel_page "Return to Top of Page"
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<br>
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\ref main_page "Return to Main Page"
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*/
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