[arm-allstar] config for split rx/tx

David McGough kb4fxc at inttek.net
Mon Jan 1 21:34:33 EST 2018

Hi Dan,

The method you're suggesting will work fine. While I'm sure there are
probably at least a half dozen different ways to configure this setup, the
way I've done it is to setup both RPi3 configs as if they've connected to
a standard full-duplex repeater (duplex=2 in the rpt.conf node stanza).  
This gives me all the typically expected repeater telemetry, hang times, 

On the TX end, only connect TX audio (headphone output audio from fob) and
PTT to the radio. Make sure COS/CTCSS are set so they never activate.

On the RX end, attach RX audio (to the fob mic input) and COS/CTCSS, but
no PTT or TX audio.

Then, link the 2 nodes together via *3 (or *73) and voila! ...a simple
split site repeater that acts just like a "normal" single site repeater!

...It really is this simple!

Happy New Year!

73, David KB4FXC

On Mon, 1 Jan 2018, "Dan Keizer via arm-allstar" wrote:

> Hi there - been using the hamvoip distro for a while now - works great.
> We even used it to experiment with linking in different repeater systems -
> tests went well for us.
> Since we don't have much in the way of 220MHz repeater systems here in
> EN19-land, we decided to try out a little linking project.
> We run a highspeed 2.3GHz, 3.6GHz and 5.8GHz ham network here in the city
> and area and have access to some decent building/tower sites - reference:
> http://va4wan.ampr.org/  Now, with space and electricity always being an
> issue, we wanted to run it in a low-profile mode, for both space and power.
> I picked up a number of the USB audio dongles a while back and we have a
> surplus stash of some small maxon synthesized 5watt radios - and with the
> recent sales on, i was able to pick up a couple of 220Mhz cushcraft
> antennas for a decent price - so ,with my extra pi 3's i have, we put
> together a little project.
> one site will have a raspberry pi, usb dongle, maxon radio and a 220mhz
> receiving antenna.  It will also tie into our highspeed va4wan network.
> the other site will have a raspberry pi, usb dongle, maxon radio and 220mhz
> transmitting antenna.  it also will be line-of-sight to our highspeed
> network.
> they are separated apart both vertically and horizontally to not cause a
> problem.
> I've defined the nodes to be private for now and they are networked.
> i'll be making my final mods to the configs today and powering up the units
> and test this out --- anyone done something similar to give some insights
> as to what else to watch for?  i don't expect any issues, but always
> interested in hearing others opinions and how things went.
> 73, Dan ve4drk
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