Author Topic: APRS and other Digital modes for mobile devices  (Read 3630 times)

Offline DonC

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APRS and other Digital modes for mobile devices
« on: November 13, 2016, 10:47:13 PM »
So, I found this cable on Amazon. It's made by Baofeng. It's a digital mode interface cable for Android/Apple devices using a Baofeng radio.

Now, I was in the process of building my own interface when I found this interface cable. I figured, for $20 +S/H, even if it turned out to be junk, I could salvage the 2pin and the TRRS end of the cable to make another project. So it was a win win.

Much to my surprise, it worked like a charm. In a few minutes, I set up an APRS station using my Android Tablet, a Baofeng UV82 and this interface cable. It works great.

Well, as luck would have it, I tried it with DroidPSK on 2m. Using the same setup, I added another UV82 and and my Android phone to receive. It copied flawlessly! Is it ideal? Probably not. Hardly anyone uses 2m PSK for obvious reasons. But it does work!

This is a neat interface for digital modes that won't break the bank. I continue to use it for APRS purposes and I got a 2nd one for either backup or one for my truck and one for the go-box!

Sorry, I'm not good at uploading pictures using my phone, so I'll post the link to this cable and I'll try to upload pics tomorrow!

L8r,
Don

BTECH APRS-K2 Cable (K2 to TRRS Connector) for BaoFeng, BTECH BF-F8HP, UV-82HP, UV-5X3 (APRSDroid, APRS.fi Compatible - Android, iOS) https://www.amazon.com/dp/B01LMIBAZW/ref=cm_sw_r_cp_apa_GYukybNJ1MGTS

Offline Carl

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Re: APRS and other Digital modes for mobile devices
« Reply #1 on: November 14, 2016, 03:24:41 AM »
So this works with BAOFENG radios and KENWOOD handy talkies too. The use of FM does limit range a bit
but the system can receive a message without you direct involvement and be fairly secure as few would
actually realize what they heard and fewer still would has software or interface to use it ...great opsec for Ham and
even non-licensed radio bands.

Compatible with Kenwood K2 Accessory Slot Radios (such as BaoFeng, BTECH, Wouxun, TYT)

Compatible with all phones, tablets, and computers with 3.5MM Audio In/Out Ports


Offline SCWolverine

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Re: APRS and other Digital modes for mobile devices
« Reply #2 on: November 15, 2016, 09:57:59 AM »
so, does APRSDroid 'Digipeat' or just 'peat'?

Offline DonC

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Re: APRS and other Digital modes for mobile devices
« Reply #3 on: November 15, 2016, 11:01:34 AM »
Ha! Too funny! But as far as I know, it just peats!

Offline Carl

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Re: APRS and other Digital modes for mobile devices
« Reply #4 on: November 15, 2016, 11:44:04 AM »
I can TRACK DON and he can send and receive TEXT but I think it depends on the software you use as to full function digipeater.

Offline Smurf Hunter

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Re: APRS and other Digital modes for mobile devices
« Reply #5 on: November 15, 2016, 11:52:10 AM »
I can TRACK DON and he can send and receive TEXT but I think it depends on the software you use as to full function digipeater.

So you can now do what google has been doing for a decade?   ;D

This was my summer of 2016 (zoomed out to give the illusion of privacy).
If I drilled down to a month or even day, it'll tell me all the errands I ran, and how long I spent sitting in a particular restaurant.
Rather skynet really...

Offline Carl

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Re: APRS and other Digital modes for mobile devices
« Reply #6 on: November 15, 2016, 03:29:00 PM »
I did APRS and PACKET almost 20 years ago and have long ago found it more useful to others as I have many other facets of Ham radio to explore.

Offline SCWolverine

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Re: APRS and other Digital modes for mobile devices
« Reply #7 on: November 16, 2016, 02:14:23 PM »
According to Julian OH8STN (SurvivalTech Nord)

Quote
As Far as I know, there is no Digipeater on Android yet. I'll have to check APRSDROID on Github when I get home,  but on last check (I'm watching actively) this was a NoGo, just igate :/

Offline DonC

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Re: APRS and other Digital modes for mobile devices
« Reply #8 on: November 18, 2016, 07:59:15 PM »
APRS-K2
It’s long overdue, but there’s finally a TRRS/APRS cable available for radios using a standard Kenwood style K2 connector.
I’ve been wanting to get involved with APRS for a while now, and this made it extremely easy.
APRS-K2 interface cable
The APRS-K2 cable allows you to interface your handheld transceiver with your existing mobile device, including. iPhone, iPad, and Android.

One end of the cable uses the Kenwood style K2 connector, while the opposite end is aprs-xover-25terminated with a TRRS connector. Also included with the APRS-K2 is a Reverse Adapter to insure compatibility with all devices. This adapter allows cable to connect to earlier 3.5MM TRRS standards, such as Nokia.

App Driven
The APRS-K2 cable uses a virtual TNC found in several apps, such as APRSDroid, APRS.fi, and Pocket Packet. Plug in the cable, turn on the VOX, and you’re pretty much set to go.
Product Description
BTECH APRS-K2 TRRS / APRS Cable A simple way to start using APRS by using devices you already own. The BTECH APRS-K2 Cable will quickly connect your radio to APRS by using virtual TNC (app driven) on your tablet or device. The APRS-K2 cable is built with a custom circuit board that will automatically adjust the audio for clear packet transmissions with minimal adjustment; along with protecting your devices from strong over modulated signals.
Along with allowing APRS functionality the APRS-K2 cable can provide a simple interface gateway to allow several features to your radio!
Easily record radio conversations:
By connecting the APRS-K2 cable between your radio and any recording (line-in) device.
Use the APRS-K2 cable as a Mic In Connector:
Set up VOX on your radio to accept any form of incoming audio – such as a Push-to-talk application on a Phone – or a Line-out application from your computer.
Use the APRS-K2 cable to push transmissions over a speaker system:
Easily play audio over a intercom or speaker system from your handheld.
With a backup radio and your own ingenuity, the APRS-K2 cable can serve as an interface for a variety of applications for any amateur. Compatible with Kenwood K2 Accessory Slot Radios (such as BaoFeng, BTECH, Wouxun, TYT) Compatible with all phones, tablets, and computers with 3.5MM Audio In/Out Ports
Includes:
APRS-K2 Cable
Reverse Connector Adapter
Quick Start Guide

Conclusion:
The cable comes with a simple one page instruction sheet which should have you up and running in about 10 minutes after the appropriate app is loaded.
–  Plug in the cable
–  Set your handhelds volume control
–  Turn on the VOX
–  Set your handheld to 144.390 (US)
–  Activate the app
That’s all it takes. If you’ve been considering building an APRS cable, you might find this an easy Plus and Play alternative.
The APRS-K2 can be ordered from   Amazon, or if outside the US, you can go to their website and contact them directly.   Baofeng Tech
Too many toys, too little time.
John ‘Miklor’   K3NXU
http://www.miklor.com

SC-"It works as an igate, but not as a digipeater."

-Don

Offline jchiar

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Re: APRS and other Digital modes for mobile devices
« Reply #9 on: May 01, 2018, 09:25:44 AM »
Sorry to bump an old thread, but is anyone still using this? If i had multiple walkie talkies, would they all communicate like a mesh with APRS?

Offline kid_couteau

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Re: APRS and other Digital modes for mobile devices
« Reply #10 on: May 01, 2018, 12:48:41 PM »
OK as you know I am new to HAM but not electronics.
APRS? Please explain what it is and how it works?
Thank you
Kid

Offline Carl

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Re: APRS and other Digital modes for mobile devices
« Reply #11 on: May 01, 2018, 02:27:11 PM »
OK as you know I am new to HAM but not electronics.
APRS? Please explain what it is and how it works?
Thank you
Kid

APRS is a method of sending TEXT and DATA with FM radio from unit to unit that includes digital forwarding and often mailboxes. I asked DON ,one of my students to fill you in as this is his thread. The link below will give you something to read till DON catches up.

https://en.wikipedia.org/wiki/Automatic_Packet_Reporting_System

Offline Smurf Hunter

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Re: APRS and other Digital modes for mobile devices
« Reply #12 on: May 01, 2018, 03:27:37 PM »
OK as you know I am new to HAM but not electronics.
APRS? Please explain what it is and how it works?
Thank you
Kid

It's worth googling as it's an entire genre of operating.

Basically it's a packet (VHF typically) over RF.  If you are an old timer who used dial up modems, packet is very similar to X.25 protocol.
APRS uses that protocol as a way to broadcast simple data.  Usually name and location. Also weather and other simple metrics.

Check out https://aprs.fi

Offline kid_couteau

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Re: APRS and other Digital modes for mobile devices
« Reply #13 on: May 01, 2018, 03:44:26 PM »
OK thank you
Yup dial up and me go back a ways
I could tell you then what the different tones meant

Offline SCWolverine

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Re: APRS and other Digital modes for mobile devices
« Reply #14 on: May 01, 2018, 04:18:05 PM »
OK thank you
Yup dial up and me go back a ways
I could tell you then what the different tones meant

1. Listen: http://hamradio360.com/index.php/2017/01/24/ham-radio-360-all-about-aprs-with-w6kwf/

2. Listen: http://hamradio360.com/index.php/2017/03/07/ham-radio-360-aprs-follow-up-listener-qa/

yeah, I know they are mine...but they are also 2 of my top 5 downloaded shows.  We break it down pretty sufficiently  8)

hope that helps

Offline kid_couteau

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Re: APRS and other Digital modes for mobile devices
« Reply #15 on: May 01, 2018, 05:01:44 PM »
Thank you
And I have listened to many of your shows loved them

Offline kid_couteau

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Re: APRS and other Digital modes for mobile devices
« Reply #16 on: May 03, 2018, 07:47:50 AM »
BTW keep up the good work on the Field Radio Podcast. I love that one.  8)

Offline SCWolverine

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Re: APRS and other Digital modes for mobile devices
« Reply #17 on: May 03, 2018, 07:52:01 AM »
BTW keep up the good work on the Field Radio Podcast. I love that one.  8)

Cool, make sure to let John know-he's running that show (I'm officially retired from all HR podcasting)  8)

Offline kid_couteau

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Re: APRS and other Digital modes for mobile devices
« Reply #18 on: May 03, 2018, 08:30:07 AM »
Too bad
You did a great job
PLEASE PLEASE COME BACK

Offline Alan Georges

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Re: APRS and other Digital modes for mobile devices
« Reply #19 on: May 03, 2018, 08:54:50 PM »
I tell you what, between losing SCWolverine's podcast and Art Bell himself, there's not much good left to listen to these days.

Offline kid_couteau

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Re: APRS and other Digital modes for mobile devices
« Reply #20 on: May 04, 2018, 06:11:35 AM »
Using a cable from Android to Baofeng
Could DroidPSK be used to send a document from one android to another?

Offline Carl

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Re: APRS and other Digital modes for mobile devices
« Reply #21 on: May 04, 2018, 06:35:08 AM »
Using a cable from Android to Baofeng
Could DroidPSK be used to send a document from one android to another?

I have sent link to your questions to DON,but he is dealing with arrangements in the aftermath of his fathers death . The transfer of text can be done as copy and paste but direct transfer of xx.DOC files will not likely direct transfer due to limitations of the software. I did the APRS over 20 years ago and perhaps some things are different now. I will try to  include another ,Smurf Hunter ,as his is well versed in many digital formats..