anderskitson
Posts: 2
Joined: Mon Jan 20, 2014 5:07 am

Two Way Radios with rasberry pi

Mon Jan 20, 2014 5:10 am

My question will probably be very general since I have no idea where to start or if it is even possible. I want to build a box with a single button that when pressed connects to a two way radio frequency and you can communitcate through a microphone to someone listening on a two way radio of that frequency and also be able to hear on that frequency so a speaker, transmitter, receiver and mic. On the regular two way radio frequencies. Is this possible?

scotty101
Posts: 3782
Joined: Fri Jun 08, 2012 6:03 pm

Re: Two Way Radios with rasberry pi

Mon Jan 20, 2014 12:03 pm

Personally, I wouldn't even consider the raspberry pi for this project. Why?
Raspberry Pi has none of the Radio Frequency hardware needed.
There are many other dedicated Integrated Circuits out there with the specific purpose of modulating sound and transmitting it which would be much cheaper than a raspberry pi.
Electronic and Computer Engineer
Pi Interests: Home Automation, IOT, Python and Tkinter

anderskitson
Posts: 2
Joined: Mon Jan 20, 2014 5:07 am

Re: Two Way Radios with rasberry pi

Mon Jan 20, 2014 9:43 pm

For the why? I dont know of any other projects for doing this and am curious about rasberry pi, so thought I would ask. I know ardunio has this http://store.linksprite.com/wireless-in ... o-pcduino/ Do you have any links to these many integrated circuits you speak of?

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redhawk
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Re: Two Way Radios with rasberry pi

Mon Jan 20, 2014 10:23 pm

I'm sorry to say this kit is laughable at best all I can see is a power hungry radio transmitter / receiver board strapped to an Arduino with 99% of functionality already implemented on the board anyway.
Furthermore you'll need to buy 2 of them to have a 2 way conversation with someone so cost is not $55 + tax but $110 + tax.

As suggested by the previous poster you're better off using dedicated hardware like a Midlands FRS/GMRS - http://www.amazon.com/Midland-GXT1000VP ... B001WMFYH4 or Motorola FRS - http://www.amazon.com/Motorola-MD200R-F ... 0072LB10S/ this works out a lot cheaper.

Don't get my wrong this board probably works okay but I don't see the point in using it to be honest.

Richard S.

SiriusHardware
Posts: 502
Joined: Thu Aug 02, 2012 9:09 pm
Location: UK

Re: Two Way Radios with rasberry pi

Wed Jan 22, 2014 12:11 am

redhawk wrote:I'm sorry to say this kit is laughable at best all I can see is a power hungry radio transmitter / receiver board strapped to an Arduino with 99% of functionality already implemented on the board anyway.
Furthermore you'll need to buy 2 of them to have a 2 way conversation with someone so cost is not $55 + tax but $110 + tax.

As suggested by the previous poster you're better off using dedicated hardware like a Midlands FRS/GMRS - http://www.amazon.com/Midland-GXT1000VP ... B001WMFYH4 or Motorola FRS - http://www.amazon.com/Motorola-MD200R-F ... 0072LB10S/ this works out a lot cheaper.

Don't get my wrong this board probably works okay but I don't see the point in using it to be honest.

Richard S.
Just to add: In Europe the legal equivalent to the American / Canadian 'FRS' system is PMR446, which works on 8 UHF radio channels with 0.5 watts of power. The majority of small two-way radios sold in supermarkets / sports shops / camping stores in the UK / Europe are PMR446.

Neither FRS or GMRS can legally be used here, and there is no direct European equivalent to the more powerful GMRS system.

There have actually been some successful experiments using Arduinos and Pis as very low power (across the room, or across the street at most) voice / audio transmitters using a conventional radio receiver at the other end, and maybe that's where the OP's idea is coming from, but to use them for two-way communications over a decent distance would require so much extra hardware as to make the Pi almost redundant.

pksato
Posts: 295
Joined: Fri Aug 03, 2012 5:25 pm
Location: Brazil

Re: Two Way Radios with rasberry pi

Wed Jan 22, 2014 6:02 pm

Hi,
Use linked arduino shield on RPi, just need some logic level translator and new software.
All Radiocom is done on shield (by undefined chip), arduino only control.

advice:
Radio Spectrum are controlled all countries, some have a very rigid law about non authorized radio emissions (even listening).
On most countries have a some bands, called ISM (Industrial, Scientific and Medic), frequencies that can be used without any previous permission, but at very low power (<100mW). WiFi, bluetooth, and other consumer wireless devices use these bands, and linked arduino shield.


In theory, with a extra $10 hardwares (to receiver part/audio in) is possible to build a NFM transceiver using only RPi. And lots of programing.
Due some early controversy about, I can not provide more details.


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