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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]

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How To Convert Morse Key Input To Audio

I am thinking of purchasing a TYT TH-9800 Plus. Its only drawback is there is no input for a CW device. What Equipment would be required to convert CW output into audio input?
octopusgrabbus's user avatar
3 votes
0 answers
146 views

Strange interference - consistent series of beeps/chrips at frequencies 145-146 KHz apart

I'm new at Ham Radio, in fact still studying for Technician (so I can't transmit) but I purchased a used Icom IC-746, dipole antenna kit and most recently a Hexbeam antenna. The power supply is an ...
David Rouse's user avatar
1 vote
2 answers
108 views

Cannot transmit with direwolf ("Audio output start error")

I'm trying to run direwolf (1.6.0) on Fedora 38. I'm using a C-Media USB audio device to interface with the radio: ...
larsks's user avatar
  • 608
3 votes
2 answers
4k views

Signal in the center frequency of my SDR spectrum always

I'm pretty new to SDR, but I understand a little bit about RF. On all 3 of my SDR device (two RTL one HackRF) The center frequency is always full of interference from something unknown.....it doesn't ...
Dani's user avatar
  • 133
0 votes
1 answer
1k views

SSTV decoder for already-recorded files?

I have a full SSTV transmission pre-recorded. Is there any way that I could take the audio file and decode it? Alternatively, is there a way to select the audio device (for example, to read an audio ...
Galaxy's user avatar
  • 199
0 votes
1 answer
1k views

Creating a low cost ear protection/ PTT setup for hunting

I have been trying to create a low cost communication setup for when I go hunting. Using this setup the hope is to be able to talk to one another while separated without having the audio up too loud. ...
Layne Hedrick's user avatar
4 votes
1 answer
557 views

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 ...
john8791's user avatar
2 votes
2 answers
1k views

Looking for headset to use with BTech UV-25x2

I have a BTech UV-25x2 that I'm using as a portable base station. This radio has a "TRRS" connection (GND/SP/MIC/PTT) which I would like to get a headset for. I'm relatively new to ham radio, so don't ...
ParanoidGeek's user avatar
2 votes
2 answers
611 views

How to use HT microphone with two jacks (Kenwood connector) as a substitue for KX-3 microphone?

The original microphone for KX-3, Elecraft MH-3, is insanely expensive. What changes would be necessary to convert a cheaper speaker/microphone for a FM handheld transceiver? Is there any ready-to-buy ...
Jindrich Vavruska OK4RM's user avatar
1 vote
1 answer
583 views

Design/Build a DIY Audio Attenuator and Splitter

I’m trying to be less of an appliance operator. To that end, I recently came up with a simple project that I thought I could figure out and build entirely on my own. I was wrong. My goal was to ...
W2ASC's user avatar
  • 63
1 vote
1 answer
1k views

My radio and audio output keep changing using WSJTX on FT8

TL;DR Laptop keeps switching between Signal Link audio output and speakers. Problem goes away when I turn TX knob down far enough on Signal Link. I just bought a SignalLink and have it connected ...
Adam KC0DAD's user avatar
9 votes
2 answers
1k views

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, ...
Evan Krall's user avatar
5 votes
1 answer
2k views

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 ...
user3486184's user avatar
  • 1,957
2 votes
0 answers
85 views

Is PC to Digital Radio possible, is there an existing solution?

Is it possible to setup up an interface from a PC to a digital radio that is able to communicate with a Hytera PD702 handheld (450-520MHz) or like type radio? Or are there off the shelf radios that ...
jono2010's user avatar
  • 131
6 votes
1 answer
4k views

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 ...
Jack. D's user avatar
  • 69
2 votes
1 answer
264 views

Using an OPC-478 programming cable for CI-V

I have an [clone of] an Icom OPC-478 programming cable for my IC-208H. I thought I read that I can use that same cable to do CI-V with my IC-706 if I can find an 1/8" mono (male) to 1/8" stereo (...
Duston's user avatar
  • 939
3 votes
3 answers
5k views

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 ...
Evan Krall's user avatar
3 votes
1 answer
224 views

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 ...
Thomas's user avatar
  • 754
2 votes
2 answers
1k views

Receiving audio output from IC-9100 through USB port

Can someone please give me a clue here? I'm having problems receiving data from the IC 9100 radio. I want to receive ax25 packets using FSK G3RUH modulation with an IC-9100 radio. It is configured ...
Ibtissam Latachi's user avatar
3 votes
2 answers
3k views

What cable is needed in order to record audio from a Baofeng UV-5x3 on a computer?

I would like to be able to connect my radio to my computer in order to record audio. It seems like this would just be a matter of getting the right cable, but after trying a few cables (listed below), ...
Jim's user avatar
  • 45
2 votes
1 answer
107 views

How should I measure RFI on the headset cable from a hand-talkie?

I'd like to build an audio interface cable from my smartphone to my Yaesu FT-60 which incorporates VOX (since the Yaesu doesn't have VOX functionality) for APRS apps on the phone. I'm having problems ...
watkipet's user avatar
  • 689
3 votes
3 answers
1k views

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. ...
Luca's user avatar
  • 329
2 votes
1 answer
435 views

Looking for documentation on Kenwood NX-700 AFO and DEO Signals

I'm studying the accessory connector (DB-25) from a Kenwood NX-700 radio. It seems that I might use the AFO and/or DEO signals, but I haven't been able to get proper documentation on such pins/signals....
Gonzalo Vasquez's user avatar
7 votes
1 answer
2k views

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 ...
hamster's user avatar
  • 295
1 vote
1 answer
266 views

What issues can I expect when using Bluetooth for packet radio?

So I have an IC-2730, which doesn't have external inputs for packet radio, but it does have optional board for Bluetooth connectivity and there's also an optional Bluetooth headset for it. I'm trying ...
AndrejaKo's user avatar
  • 2,893
17 votes
9 answers
32k views

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 ...
user400344's user avatar
3 votes
1 answer
2k views

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 ...
Skyler 440's user avatar
  • 7,620
2 votes
1 answer
233 views

Where to pull audio for packet on an alinco DR-600

I have an old Alinco dual-band radio, the DR-600 (service manual) (manual) I want to use this radio for receiving APRS packets. The speaker audio out Works but there are too many things to go wrong ...
Skyler 440's user avatar
  • 7,620
3 votes
2 answers
2k views

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 ...
Skyler 440's user avatar
  • 7,620
4 votes
2 answers
4k views

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 ...
Andreas Hartmann's user avatar
6 votes
1 answer
6k views

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 ...
Kevin Reid AG6YO's user avatar
  • 24.7k
3 votes
1 answer
843 views

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 ...
Skyler 440's user avatar
  • 7,620
10 votes
2 answers
5k views

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 ...
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