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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), I'm realizing it's not that simple. I would like to be able to record audio so that I could save morse to practice decoding, record call signs so I can update a log book later on, and - somewhere down the line - be able to do something like record connections with satellites / ISS).

My Setup

  • Baofeng UV-5x3
  • MacBook Pro running High Sierra (10.13.5)

What I've tried

I have naively attempted to use these cables to connect to my Mac:

In both cases, the Mac doesn't receive any audio. Thinking that the issue might be with configuring the Mac's audio, I tried connecting each cable to my car's auxiliary input (which I can use to play audio from my iPhone). There again, I didn't hear anything from the radio.

After searching online, I've seen a lot of people just use their computer's external microphone to record audio. It seems like there should be an easy way to send radio output directly to a computer, though.

Related

I found that these existing questions provided interesting information, but didn't quite answer my question:

Jim
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  • The audio connector on a mac (TRRS + optical, "let's cram everything into one connector like it's a phone") is not the same as you'll find in a car (TRS stereo line in). – Phil Frost - W8II Jul 15 '18 at 20:48
  • Last I knew Mac's also have line level mic inputs too. – Don Rhodes Jul 15 '18 at 20:51
  • I was able to use a few cables to record audio off my HTs with a cellphone, but I do not have links right now m – Don Rhodes Jul 15 '18 at 20:52
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    Current Macs have only a 4-contact (TRRS) jack which operates like the one on a cell phone — mic input (with bias voltage) only. – Kevin Reid AG6YO Jul 15 '18 at 22:28
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    by the way, since these things are *really* cheap, you could just use an RTL-SDR dongle, and record like *a lot* of channels *simultaneously* **without** your Baofeng handheld, for very comparable cost to building your own for baofeng audio->mac audio – Marcus Müller Jul 16 '18 at 12:25
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    This does not provide an answer to the question. Once you have sufficient [reputation](https://ham.stackexchange.com/help/whats-reputation) you will be able to [comment on any post](https://ham.stackexchange.com/help/privileges/comment); instead, [provide answers that don't require clarification from the asker](https://meta.stackexchange.com/questions/214173/why-do-i-need-50-reputation-to-comment-what-can-i-do-instead). - [From Review](/review/low-quality-posts/6538) – Glenn W9IQ Jul 16 '18 at 11:47
  • @GlennW9IQ You would make a good moderator! :-) I have moved the answer (with its comments) to a comment. – Mike Waters Jul 16 '18 at 20:45

2 Answers2

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I built an audio interface that connected from an HF radio to my Mac, a few years ago. Obviously, I was concerned with ground loops and hum and suchlike, because I intended to use the interface to transmit too, so I used audio transformers as well.

But the one thing I found that surprised me was that (as mentioned in comments by Kevin) the Mac has a slightly odd audio connection system. As Kevin says, it’s a TRRS arrangement, but in order to make the Mac ‘see’ that there is a microphone connected, you need to put a diode between one of the Rings and ground. This is to allow the macOS to detect whether a microphone is present or not, and thus enable incoming audio.

I just used a regular small-signal silicon diode (1N4148 I think), and suddenly the Mac could ‘see’ that there was an audio input and allowed incoming audio through.

Use a continuity tester on a pair of Apple-compatible headphones with a microphone to determine which Ring should have the diode, and which way round it should be.

Of course, to be ultra-paranoid about the safety of your expensive computer when connected to a famously ‘cheap’ radio, you might want to consider an audio transformer too :)

Scott Earle
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  • Based on the answers I've read, it sounds like there aren't any cables that you can buy to make the connection (but, instead you have to use a 'homebrew' setup like you've described here). Does that sound right? – Jim Jul 17 '18 at 20:09
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    Thanks for your answer here (and want to say thank you to everyone else as well). I think this will be a helpful reference if I can gather the supplies to try building a cable. Really appreciate the background information and tips! This was my first question on stackexchange and I was amazed at the quick replies. Thanks everyone! – Jim Jul 17 '18 at 20:11
  • You can buy them. Amazon sells Mac/iOS TRRS Audio adapters for guitar input. That’s what I use to test my Morse Decoder iOS app from a Yaesu. Here’s one: https://www.amazon.com/gp/product/B00M416TV2 – hotpaw2 Jul 21 '18 at 05:38
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Baofeng uv-5r3 connector: Check the manual. Page 13 on PDF reader or manual Page 08

https://baofeng-uv-5rx3.s3.amazonaws.com/Baofeng%20UV-5RX3%20User%20Manual_Digital%20Version_20201013.pdf

It is more complex than you think. Mac end, I have no idea.

(I would drop it in this post. But, i don't know how)

standeg
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