[App_rpt-users] Connecting several sites together on a hub using link radios

[Stephen - K1LNX]

Hi Bob... basically each site is linked with a linking radio on the
repeater pair. The link radio is connected to a Raspberry Pi and a suitable
USB interface. Each node is then linked permanently to our hub node, which
is a pseudo node with no hardware connected.

The repeater nodes are built as half-duplex, hub is full-duplex.

As for radios.. we are using either a Motorola SM50, MaxTrac, and one CDM.

73
Stephen
K1LNX


On Fri, Aug 26, 2016 at 6:54 AM, Bob Pyke <k6ecm1 at gmail.com> wrote:

> What is your node structure at the repeater and hub ends of the link? In
> other words, how is the repeater end of the link tied to the repeater, as
> well as the hub end of the link?
>
> It seems to me that both ends of the link cannot be full-duplex because
> they will feedback on themselves. You may consider full-duplex at the hub
> end, and half-duplex at the repeater end of the link, where the hub is the
> master, and the satellite repeaters are the slaves, but each repeater
> itself operates as full-duplex.
>
> Curious... what are you using for radios for the link portion of the
> system?
>
> Thanks,
> Bob
> k6ecm
> 73
>
> Sent from iPad
>
>
> On Aug 26, 2016, at 2:48 AM, Stephen - K1LNX <k1lnx at k1lnx.net> wrote:
>
> Hi guys... I am in the midst of deploying a 5 site system. All of the
> sites with the exception of my own will be using link radios sitting on the
> repeater pair, some sites do not have internet access so this is the only
> option. Each node will be permalinked to our hub.
>
> What we discovered when we brought site number 3 online was the dreaded
> "ping-pong" effect, and I did some digging and found out about the
> rxondelay parameter, that seems to be the place to start with this.
>
> The other option we are considering is dropping the hang time off each
> repeater and using app_rpt to do hang time and courtesy tones instead
> (duplex = 1 instead of 0) but not sure that would work real well or be
> optimal.
>
> Anyone have any experience with a setup like this that can offer some
> advice? This is my first foray into this unfortunately, I've always just
> interfaced the radio or repeater directly to app_rpt in the past or through
> a controller so it's been a bit of a challenge.
>
> 73
> Stephen
> K1LNX
>
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