[App_rpt-users] Is this possible? - Using a radio remotely with an IP phone on a private network

[Brett Friermood]

As the others have said, this is entirely possible and should work very
well for you.

Couple of thoughts:
When using a phone as the user interface, rather than traditional push to
talk/release to listen functionality, a DTMF sequence needs to be used to
both activate and deactivate the transmitter. Not overly complex once
gotten used to, but depending on who will be using this it may be
beneficial to have a more traditional microphone and speaker setup next to
the existing radio.

There are a few different sources for how to build such an interface, but
basically you would build another node and rather than interface it to a
radio just connect a microphone and speaker (and PTT if not built into the
mic). This would allow the operator to grab one microphone or the other
depending on the radio needing to be used without consideration of a
different interface. This also could add the benefit of using a permanent
connection between the two nodes to better handle any network issues where
it would otherwise require manual (re)connection.

Secondly, since you are dealing with AM modulation, depending on the
specific radio being used at the remote location it may or may not have a
Rx Active output. If it does, interfacing would be like any other, but in
the event it only has PTT, audio in, and audio out you may end up using VOX
for detecting receive activity.




On Wed, Jul 18, 2018 at 10:57 PM, Noah Chalker <ke5vql at gmail.com> wrote:

> Hello,
>
>  While it is not ham radio related, the university I attend and work
> for is considering putting a secondary aviation radio at the sattelite
> campus of ours where we do flight training. We have a radio at the main
> campus to talk to our aircraft but the aircraft at our sattelite campus are
> out of range of the main campus. I thought ROIP (AllStar) would be an
> effective way to use a radio at the sattelite campus from the main campus.
> The concept would be like a Remote Communications Outlet (RCO) that is
> currently used in aviation. I would like to have it so that the radio can
> be used from the main campus using an IP phone and all ran through the
> school's network. All this is through a private node of course and not
> through the all star *network.* Is this possible? Particularly the part
> with using the IP phone (I don't think it is a good idea to link the two
> radios). Any suggestions, guidance, and links to documentation on how to do
> this would be appreciated!
>
> 73's
>
> Noah KE5VQL
>
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