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<body class='hmmessage'><div dir='ltr'><font style="" face="Tahoma,sans-serif" color="#000000">Dave,<br><br> We are working on this problem in a number of ways and hopefully soon will have some answers. There may be a production of a much cheaper URI type interface and also we are working on a USB to serial approach. Stay tuned.<br id="FontBreak"></font><br><b><font style="font-size:16pt;" size="4">73 Doug</font><font style="font-size:16pt;" size="4"><br></font><font style="font-size:16pt;" size="4">WA3DSP</font><font style="font-size:16pt;" size="4"><br></font><font style="font-size:16pt;" size="4">http://www.crompton.com/hamradio</font></b><font style="font-size:16pt;" size="4"><br></font><br><br><div>> Date: Wed, 4 May 2016 17:46:15 -0700<br>> To: arm-allstar@hamvoip.org<br>> Subject: Re: [arm-allstar] just getting started and trying to understand the current requirements with a PI2 or similar<br>> From: arm-allstar@hamvoip.org<br>> CC: david@lang.hm<br>> <br>> Just a quick follow-up on this as I'm finally getting some hardware in-hand to <br>> play with (and time to think of it :-)<br>> <br>> It's getting hard to find the cheap USB sound FOBs that do not have the chip <br>> covered with epoxy, so there is actually some real value in using the GPIOs of <br>> the Pi/BBB instead of the ones on the FOBs<br>> <br>> David Lang<br>> <br>> On Sun, 18 Oct 2015, David Lang wrote:<br>> <br>> > On Sun, 18 Oct 2015, Doug Crompton wrote:<br>> ><br>> >> Dave,<br>> >> <br>> >> Yes, you will need a USB sound interface which can be the $70 DMK URI or a <br>> >> $3 modified sound FOB. A very simple modification and source link for the <br>> >> FOB is in the howto section at hamvoip.org.<br>> >> <br>> >> Built-in sound would not work. There is no audio input on the Pi and output <br>> >> is normally routed to HDMI but can be routed to a TRRS connector - <br>> >> http://www.raspberrypi-spy.co.uk/2014/07/raspberry-pi-model-b-3-5mm-audiovideo-jack/<br>> ><br>> > ahh, I didn't realize it was missing the input side.<br>> ><br>> > I'm actually looking at building a small system with two linked receviers to <br>> > one transmitter.<br>> ><br>> > I'll look into the USB sound FOBs for the recever.<br>> ><br>> > Years ago I did a lot of adapatign of different mics to Yeasu/Icom handhelds, <br>> > I'm assuming the newest handhelds have fairly similar interfaces. In most <br>> > cases the interface is not much more than a cap, resister, and sometimes a <br>> > transister. Much cheaper than the $270 official allstar interface boards :-)<br>> ><br>> > Thanks for the clarification.<br>> ><br>> > David Lang<br>> > AG6AH<br>> ><br>> >> There has been interest in using the GPIO for COS and PTT but the USB FOBS <br>> >> have the I/O also. The modification to bring it out of the FOB is really <br>> >> not complicated. The SAME interface circuitry would be needed if using I/O <br>> >> on the FOB or off the GPIO pins. So it is really not simpler. So there is <br>> >> no completely easy way unless you buy a DMK URI.<br>> >> <br>> >> I suggest you checkout the howto for simple USB sound FOB mod. At less than <br>> >> $4 it is certainly worth a try. You don't have much to lose. If you want to <br>> >> save over $60 and you have some patience it is a fun one night project.<br>> >> <br>> >> The steps involve opening the FOB, the case piratically falls off. <br>> >> Soldering two small wires to the chip. This is the hardest part but not <br>> >> really difficult. A real easy way is shown in the photos. Solder three more <br>> >> wires onto the connectors. Bring those five wires out in a shielded cable <br>> >> (old usb cable works - 4 conductor and shield/ground) and at the other end <br>> >> wire up the additional interface components either in a small box or in a <br>> >> connector as shown in the howto. The FOBS reduce to $2.40 in 10 quantities.<br>> >> <br>> >> I don't have the time but it would be great if someone offered to build <br>> >> these for people who can not. Either partially or completely with a DB25 <br>> >> wired like the DMK on the radio end. The user would just have to supply the <br>> >> 25 pin to radio connection the same as using a DMK URI. Wiring it this way <br>> >> would make it plug compatible with the URI. I would think this could be <br>> >> done for around 1/3 of the price of the URI. I guess I am dreaming though <br>> >> because there are vendors out there ripping people off for an interface <br>> >> cable and two connectors for $50!<br>> >> <br>> >> Hams are cheap and you are right paying twice as much for a sound interface <br>> >> as the main board is a lot and if you have two nodes on one board even <br>> >> more.<br>> >> <br>> >> 73 Doug<br>> >> WA3DSP<br>> >> http://www.crompton.com/hamradio<br>> >> <br>> >> <br>> >>> Date: Sun, 18 Oct 2015 17:58:39 -0700<br>> >>> From: david@lang.hm<br>> >>> To: arm-allstar@hamvoip.org<br>> >>> Subject: [arm-allstar] just getting started and trying to understand the <br>> >>> current requirements with a PI2 or similar<br>> >>> <br>> >>> I see several blog posts talking about using a RPi with allstar that <br>> >>> ignore the<br>> >>> built-in audio and GPIO pins of the Pi in favor of external interface <br>> >>> boards<br>> >>> that cost several times more than the Pi does.<br>> >>> <br>> >>> I'm hoping that these were just early attempts and current versions will <br>> >>> use the<br>> >>> built-in audio and much simpler radio interfaces from the GPIOs<br>> >>> <br>> >>> What's the status on this sort of work?<br>> >>> <br>> >>> David Lang<br>> >>> _______________________________________________<br>> >>> <br>> >>> arm-allstar mailing list<br>> >>> arm-allstar@hamvoip.org<br>> >>> http://lists.hamvoip.org/cgi-bin/mailman/listinfo/arm-allstar<br>> >>> <br>> >>> Visit the BBB and RPi2 web page - http://hamvoip.org<br>> >>> <br>> ><br>> _______________________________________________<br>> <br>> arm-allstar mailing list<br>> arm-allstar@hamvoip.org<br>> http://lists.hamvoip.org/cgi-bin/mailman/listinfo/arm-allstar<br>> <br>> Visit the BBB and RPi2 web page - http://hamvoip.org<br>> <br></div> </div></body>
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