[arm-allstar] just getting started and trying to understand the current requirements with a PI2 or similar

[David Lang]

On Sun, 18 Oct 2015, Doug Crompton wrote:

> Dave,
>
> Yes, you will need a USB sound interface which can be the $70 DMK URI or a $3 
> modified sound FOB. A very simple modification and source link for the FOB is 
> in the howto section at hamvoip.org.
>
> Built-in sound would not work. There is no audio input on the Pi and output is 
> normally routed to HDMI but can be routed to a TRRS connector - 
> http://www.raspberrypi-spy.co.uk/2014/07/raspberry-pi-model-b-3-5mm-audiovideo-jack/

ahh, I didn't realize it was missing the input side.

I'm actually looking at building a small system with two linked receviers to one 
transmitter.

I'll look into the USB sound FOBs for the recever.

Years ago I did a lot of adapatign of different mics to Yeasu/Icom handhelds, 
I'm assuming the newest handhelds have fairly similar interfaces. In most cases 
the interface is not much more than a cap, resister, and sometimes a transister. 
Much cheaper than the $270 official allstar interface boards :-)

Thanks for the clarification.

David Lang
AG6AH

> There has been interest in using the GPIO for COS and PTT but the USB FOBS 
> have the I/O also. The modification to bring it out of the FOB is really not 
> complicated. The SAME interface circuitry would be needed if using I/O on the 
> FOB or off the GPIO pins. So it is really not simpler.  So there is no 
> completely easy way unless you buy a DMK URI.
>
> I suggest you checkout the howto for simple USB sound FOB mod. At less than $4 
> it is certainly worth a try. You don't have much to lose. If you want to save 
> over $60 and you have some patience it is a fun one night project.
>
> The steps involve opening the FOB, the case piratically falls off. Soldering 
> two small wires to the chip. This is the hardest part but not really 
> difficult. A real easy way is shown in the photos. Solder three more wires 
> onto the connectors. Bring those five wires out in a shielded cable (old usb 
> cable works - 4 conductor and shield/ground) and at the other end wire up the 
> additional interface components either in a small box or in a connector as 
> shown in the howto. The FOBS reduce to $2.40 in 10 quantities.
>
> I don't have the time but it would be great if someone offered to build these 
> for people who can not. Either partially or completely with a DB25 wired like 
> the DMK on the radio end. The user would just have to supply the 25 pin to 
> radio connection the same as using a DMK URI. Wiring it this way would make it 
> plug compatible with the URI. I would think this could be done for around 1/3 
> of the price of the URI. I guess I am dreaming though because there are 
> vendors out there ripping people off for an interface cable and two connectors 
> for $50!
>
> Hams are cheap and you are right paying twice as much for a sound interface as 
> the main board is a lot and if you have two nodes on one board even more.
>
> 73 Doug
> WA3DSP
> http://www.crompton.com/hamradio
>
>
>> Date: Sun, 18 Oct 2015 17:58:39 -0700
>> From: david at lang.hm
>> To: arm-allstar at hamvoip.org
>> Subject: [arm-allstar] just getting started and trying to understand the current requirements with a PI2 or similar
>>
>> I see several blog posts talking about using a RPi with allstar that ignore the
>> built-in audio and GPIO pins of the Pi in favor of external interface boards
>> that cost several times more than the Pi does.
>>
>> I'm hoping that these were just early attempts and current versions will use the
>> built-in audio and much simpler radio interfaces from the GPIOs
>>
>> What's the status on this sort of work?
>>
>> David Lang
>> _______________________________________________
>>
>> arm-allstar mailing list
>> arm-allstar at hamvoip.org
>> http://lists.hamvoip.org/cgi-bin/mailman/listinfo/arm-allstar
>>
>> Visit the BBB and RPi2 web page - http://hamvoip.org
>>
>
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