[App_rpt-users] AllStar Asterisk on a Raspberry Pi

Sun Jan 4 00:19:14 UTC 2015

Steve,

 You might want to check out my SA818 link on the hamvoip.org site. I have two running as a repeater. They are alright modules but do have some idiosyncrasies. They have poor harmonic filtering that does NOT meet FCC amateur specs so technically you need to put a filter on the output which I did in my design. I think for a cheap node the Baofeng 666 or 888 might be a better choice as it (I think) meets FCC specs out of the box. There are also links in the sa818 page to other sa818 designs and Baofeng mods. 

Good luck on the Pi. I gave up on it long ago and put all my effort into the BBB. Money wise it is really not a big difference. You can get C model BBB's for $40 at Microcenter now with good quantities so there was no real appeal to trying to get the Pi running once the BBB worked so well besides it is hard enough to support one platform. The problem is more in the OS and USB support than the platform although the BBB does have an edge in processing power. Using a bleeding edge OS is trying at times but it sure has advantages as things are maturing quickly.
73 Doug
WA3DSP
http://www.crompton.com/hamradio

> Date: Sat, 3 Jan 2015 16:39:38 -0500
> From: szingman at msgstor.com
> To: app_rpt-users at ohnosec.org
> Subject: [App_rpt-users] AllStar Asterisk on a Raspberry Pi
> 
> For the past few weeks we have been playing around with building a cheap 
> simplex node. The idea was a simple RF node for around the house.
> 
> We started with the NiceRF SA828-U. This was a pretty simple single RF 
> chip based complete UHF radio. At $22 plus shipping, worth a shot.
> The Sa818 was also considered, but the SA828 was a more complete.
> <https://www.tindie.com/products/NiceRF/all-in-one-walkie-talkie-module-kit-sa828-v-400-480mhz/>
> 
> One problem with the single chip radios is that you have no access to 
> discriminator receive audio and to the modulator input, but it's cheap.
> 
> The nice RF modules do work, but was there a better way? The SA-828 was 
> shipped from China and took forever to get to us in the States. We 
> started looking around for a alternative. Enter the Baofeng BF-888. 
> Available on Amazon, shipped from the US and $15 + tax shipped to Prime 
> account.
> 
> A number of people have used the 888 for IRLP, EchoLink and AllStar 
> nodes. One thing we wanted to do differently was to take receive audio 
> freon the receiver before the audio anp. A web search will turn up 
> everything you need to know to use this type of radio in a node.
> 
> Next was the USB interface. The DMK URI or the Repeater Builder USB RIM 
> are both fine pieces of equipment and we highly recommend them. There 
> are lots of CM108 sound FOB mods on the net. We used the WB2EDV carrier 
> board. With all new parts a a sound FOB, total cost about $23
> <http://www.repeater-builder.com/projects/fob/syba71-fob.html>
> 
> Last but not least, the node computer. Doug has created a nice 
> BeagleBone Black node computer. <http://hamviop.org> We really like the 
> BBB board but we wanted to try something else. Since we had quite a few 
> Raspberry Pi between us, why not try it. We know others have said it 
> does not work (well) but was still worth a try.
> 
> We did not want to create a downloadable image ready to go with scripts 
> to hold your hand. AllStar exported from the SVN, dahdi from 
> asterisk.org and roll your own.
> The scripts we built will help you install the required libs to compile
> Asterisk and some simple patches to fix some issues with Wheezy and
> Raspbian. SSL (res_crypto) and GSM. We also fixed the script that 
> downloads the source for iLBC just to be complete.
> 
> The test machine for the project was the first rev Pi 256 MB. Keeping 
> the loaded modules to a minimum, leaves about 64MB of free memory. Audio 
> reports are good Surprising since we are do not have access to 
> Discriminator and Modulator. The one complaint we got was the squelch 
> crash at the end of a user transmission. This is a work in process and I 
> would not put it out at a remote site. For a local simplex node, it 
> seems to work. One of the nodes is running full time on the bench at 
> node 2153.
> 
> I'll post a link to the tar of the scripts and patches. It's worth 
> playing with if you have the time to wait for a compile and want to get 
> your hands dirty with AllStar built from scratch.
> 
> Oh, and for the heck of it, we call it the PiStar ;)
> 
> 73, Steve N4IRS and Mike N4IRR.
> 
> -- 
> "Anything is possible if you don't know what you are talking about."
> 1st Law of Logic
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