Re: Raspberry Pi Zero + Baofeng UV-5R audio problems


Teton Amateur Radio Repeater Association (TARRA)
 

You may want to take into consideration the legally of this. Amateur radio is supposed to be a two-way radio service.

Mick - W7CAT

----- Original Message -----
From: Wayne Workman
To: RaspberryPi-4-HamRadio@groups.io
Sent: Saturday, February 01, 2020 05:57:13 PM
Subject: Re: [RaspberryPi-4-HamRadio] Raspberry Pi Zero + Baofeng UV-5R audio problems

> Don,
>
> This is an amateur radio application. Basically I'm working to mimic the
> functionality of these:
> https://www.dakotaalert.com/store/murs-alert-products/mat-murs-alert-transmitter/
>
> I have four of those. You might notice they are 160 dollars each. I'd like
> to have a great deal more along with better battery life and better
> transmit range, but the price is a problem.
>
> If I can simply get the Pi Zero to properly activate VOX, I have all the
> other parts solved - like power, case, camera, software, and cost control
> thereof. Plus I'd have extra features like taking photos and video and
> storing those to SD card.
>
> I've avoided things like the Signalink because of it's price.
>
> Maybe all the cheap connectors is a waste of time. Maybe I should figure on
> a custom circuit to handle PTT and transmit audio.
>
> Thanks,
> Wayne
>
>
>
> On Sat, Feb 1, 2020 at 4:56 PM Don Ritchie wrote:
>
> > Wayne,
> >
> > What is your "end game"?
> >
> > If we know what you are doing, it may be easier to help.
> >
> > Is this an amateur radio application or are there other plans ?
> >
> > Don, K8ZGW
> >
> >
> > On 2/1/2020 16:31, Wayne Workman wrote:
> >
> > Mark,
> >
> > It's worth my time. If I can get it to work, I'm probably going to build
> > 20+ of these. The whole idea behind this was to find a cheaper way.
> >
> > Thanks,
> > Wayne
> >
> > On Sat, Feb 1, 2020 at 2:28 PM Mark Griffith via Groups.Io > > yahoo.com@groups.io> wrote:
> >
> >> Wayne,
> >>
> >> Is your time trying to figure this out worth the extra $25 for your
> >> project? If it works on a Pi3, use that. The Pi zero is a pretty basic
> >> machine and the circuitry is obviously inferior.
> >>
> >> Just my 2 cents
> >>
> >> Mark
> >> KD0QYN
> >>
> >>
> >> On Saturday, February 1, 2020, 1:56:43 PM CST,
> >> wayne.workman2012@... wrote:
> >>
> >>
> >> Hello,
> >>
> >> As the title says, having some audio problems. My goal right now is to
> >> play a short .WAV file on my raspberry pi over the radio. Once I have this
> >> working, I'll use the capability in another project. I am using a USB audio
> >> adapter that works on my Raspberry Pi 3B+. I have an assortment of items
> >> I'm using, listed below.
> >>
> >> btech APRS cable for UV-5R
> >> https://baofengtech.com/aprs-k2-trrs-cable
> >>
> >> 3.5mm splitter to 3.5mm mic/headphone
> >>
> >> https://www.ebay.com/itm/Maeline-3-5mm-Female-to-2-Male-Gold-Plated-Headphone-Mic-Audio-Y-Splitter-RED/323823286696?epid=4022477076&hash=item4b655f39a8:g:syoAAOSwc4Fc8vty
> >>
> >> USB Audio adapter
> >>
> >> https://www.amazon.com/Sabrent-External-Adapter-Windows-AU-MMSA/dp/B00IRVQ0F8/ref=sr_1_1?keywords=amazon+sound+adapter&qid=1580241232&sr=8-1
> >>
> >> Baofeng UV-5R
> >>
> >> Raspberry Pi Zero v1.3
> >> https://www.adafruit.com/product/2885
> >>
> >>
> >> It's all connected like this.
> >>
> >>
> >> The Baofeng has VOX enabled, it's set to 1, which is the lowest
> >> sensitivity. I've tested that it does work with audio from computers using
> >> both my Ubuntu laptop and my Rasbperry Pi 3B+. The VOX works.
> >>
> >> My raspberry pi is fully updated with latest packages, and also has these
> >> additional packages installed. The sox command being the one that provides
> >> the 'play' command I want to use.
> >> sox motion openssh-server vim git
> >>
> >> The following command shows me the USB sound card is device 1.
> >> aplay -l
> >>
> >> I've changed the default sound device on the raspberry pi by editing:
> >> /usr/share/alsa/alsa.conf
> >>
> >> Towards the middle of the alasa.conf file there are these two lines: I
> >> changed the card number to the correct one, in my case it's 1
> >> ## CHANGE:
> >> defaults.ctl.card 1
> >> defaults.pcm.card 1
> >>
> >> I'm using this command to play the .wav file:
> >> /usr/bin/play -v 1.75 /zones/zone_five.wav
> >>
> >> Now, the problem. When I run the play command on the Raspberry Pi Zero
> >> with everything connected as pictured above, it's like the play command
> >> crashes for some reason. Pictured:
> >>
> >>
> >> Here's the interesting part. When I connect this setup to my Raspberry pi
> >> 3B+, it works fine. The pi plays the file and the Baofeng's VOX activates
> >> and transmits the audio being played. Also when I connect headphones to the
> >> headphone port on the USB adapter while using the Pi Zero, it works fine, I
> >> can hear the file playing and it has decent volume, though a bit crackly no
> >> matter what volume I pick.
> >>
> >> to boil it down, for some reason this setup is not working with the Pi
> >> Zero. I've been trying things to figure this out for a week, I'm at a dead
> >> end.
> >> I am pretty good with Linux, but I haven't even the slightest of
> >> circuitry knowledge. I am mostly googling my way through that stuff.
> >>
> >> Any ideas would be appreciated.
> >> Thank you,
> >> Wayne
> >>
> >
> >
> >
>
>
>
>
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