Amateur Radio Stack Exchange
Amateur Radio Stack Exchange

Questions tagged [audio-interface]

Analog audio signals and connecting or designing related equipment: transceiver mic/speaker ports, headphones, microphones, TNCs, computer sound cards. Closely related signaling such as PTT. See also: [microphone]

32 questions
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Is packet radio possible on Baofeng UV-5R and similar HTs?

I am curious to know if it is possible to do packet radio on VHF/UHF using the UV-5R... I have seen some invasive hardware hacks, but without modifying the radio itself (firmware, hardware) it's my understanding that you can only toggle send/receive…
user400344
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2 answers

What is the expected microphone input voltage level of a handheld transceiver?

Ok, so I'm looking to inject some computer generated CW into a little handheld rig by wiring direct into the mic input line. What sort of voltage is expected on this input, are we talking uV, mV or even Volts?
user521
9
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2 answers

How much current can Baofeng UV-5R provide on +V pin?

I noticed that the pinout for cheap Baofeng connectors has +V available. I'm interested in powering some electronics directly from this connector. When unloaded, this seems to have about 3.3V on it, but when I try to power my load (an ESP32), the…
Evan Krall
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7
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1 answer

Confusion about radio-computer interfaces: TNC, CAT, TRRS, Wolphi Link, ...?

This is probably a very simple and stupid question, but I'm getting more confused over time. Perhaps it is a matter of terminology, but a unified resource differentiating and explaining the different interfaces to connect radio with computer…
hamster
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6
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1 answer

Using standard headphones with the Yaesu FT-60?

I just got a Yaesu FT-60R handheld, along with the MH-37A4B earpiece. After having it around for a couple days, I think I'd like to be able to connect standard headphones to it, so as to be able to listen privately without carrying around an extra…
Kevin Reid AG6YO
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1 answer

How do PTT buttons work?

I'm really new to this, and I was wondering how the whole PTT system works? I have a headset with microphone, and a Baofeng UV-82 radio. I know the radio has its own PTT button, but is there any kind of PTT button that could be attached to it via…
Jack. D
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5
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1 answer

How do I put an RJ-45 connector on to repair a Kenwood MC-59 microphone cable?

I've got a Kenwood MC-59 microphone, which started fraying around the place where the mic cable goes into the body. I thought I'd cut it off and put a new RJ-45 jack on it. After cutting the cable, I discovered something completely unexpected.…
user3486184
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How to hook up my computer's audio output to my CB Radio?

I own this simple CB Radio: http://www.cbforumas.lt/upload/manuals/alan/alan_42_um.pdf I would like to connect its 2.5mm microphone jack and my computer's 3.5mm audio out jack. I have tried simple adapters and cables, but they fail, because the…
Andreas Hartmann
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4
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1 answer

Easy Digi hum with isolated ground

I am creating an Echolink simplex link using a Raspberry Pi 3 B+, a Pluggable USB sound adapter, and an "Easy Digi" sound card interface which has 2 - 600ohm isolation transformers for audio in/out as well as an opto isolated interface for the PTT…
john8791
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3
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3 answers

Iskra sst 2030 radio speaker plug

I was asked by a friend to take a look at an old 70-80s Iskra sst 2030 (ex Jugoslavian-slovenian company) radio. The radio seems to work fine but I can't understand which plug it uses for speakers. Any ideas? Levi is left in slovenian. The rest, no…
Luca
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3
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1 answer

Mic ground vs ground

Why do most radios have a microphone ground as well as a Ground? I have found that simply using one ground and tying the microphone as well as the PTT (and audio out, 5v out or whatever else is in the I/O) to work just fine.
Skyler 440
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3
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2 answers

Ideas for a simple VOX circuit for packet?

I want to build a simple circuit, preferably only a few transistors which simply activates when it hears a low level audio, and deactivates when the audio signal does not exist anymore. No pre-delay and no after delay is needed or wanted. I just…
Skyler 440
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Kenwood TM-241A direct discriminator out

I am going to do a simple SIMPLEX all-star node, using the URIx USB radio interface, which I just got. I have a Kenwood TM-241A transceiver. I was told the speaker out jack is not sufficient: The goal is access to output not influenced by the…
Skyler 440
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What is the external mic/speaker pinout for the Yaesu FT-4XR / FT-65R / FT-25R / SSM-16B?

These newer HTs seem to have a different pinout than the older Yaesu HTs. The older HTs used a single 3.5mm TRRS plug - these use a two-plug connector, with a 2.5mm jack and a 3.5mm jack, similar to the Kenwood/Baofeng style, but with the two plugs…
Evan Krall
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3
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1 answer

Is a connecting computer sound output equivalent to connecting a "dynamic" mic?

I bought a Kenwood audio breakout cable having only the kenwood connector (3.5mm and 2.5mm-in-one) on one end and up to me to add connectors on the other side. It came with a nice diagram for how to wire it up, but also said that a 1µF capacitor…
Thomas
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