Re: problem implementing tone-keyed radio-to-soundcard interface
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You would NOT be correct in that assumption. UP means? request an increase the VFO frequency (Up button on the Mic) and Down means a decrease the VFO frequency (Down button on the Mic).
The DR-140 pins you need to worry about would be (manual page 39 diagram): ? 4 PTT connect this pin to ground (7) through a transistor (I actually prefer 2n7000 over 2n2222) ???? or use an opto-isolator like a 2n36 or the 4pin PC817
? 6 MIC - TX audio into the radio ? 5 MIC GND - so the sound card MIC sleeve
? 7 GND would be the negative end of the PTT
If you need the 5V that would be pin 1 to pin 7
On Thursday, March 16, 2023 at 08:09:41 PM EDT, Sidney Tupper <sid@...> wrote:
I¡¯m making an APRS beaconer with an Alinco DR-140 radio, a tone-key radio-to-soundcard interface (page 6 of ) and a Debian Bullseye computer with audio, that hosts direwolf.? The PTT part is giving me trouble.? To test the interface, I¡¯m emulating the sound card output with my phone playing Spotify, but I get no activity on the PTT line.? Besides something being wrong with the circuit, an obvious mistake would be a wrong pinout on the RJ-45 microphone jack.? Am I right to assume that UP means transmit and DOWN means receive?? Also I¡¯m assuming the PTT ground is the MIC ground.
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From the Alinco DR-140 Service Manual, page 39:
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Tone-keyed soundcard interface
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DR-140 microphone jack
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8 ??UP
7 ??GROUND
6 ??MIC
5 ??MIC GROUND
4 ??PTT
3 ??NC
2 ??DOWN
1 ??5vdc
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TX audio to radio
ground
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PTT ground
PTT
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from radio receiver audio
5vdc
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Have I properly mapped the outputs of the interface to the radio?
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