[arm-allstar] Simplex and Allstar

[Danny K5CG]

Kip,

Simplex is easy. Set duplex=1 in rpt.conf.

; duplex=1 - Half duplex with telemetry tones
; and hang time. Does not repeat audio.
; This mode is preferred when interfacing a
; simplex node.

If you are going to use a mobile radio, you need one with COS, PTT, Audio in and out. The simplest way I've found is a Motorola GM300 or CDM radio with the Repeater Build RIM Maxtrac interface.

That gives you the sound card and COS/PTT interfaces that connect to a pi via USB.

The downside of simplex is that while somebody is talking and the receiver is captured, another operator (you) has to DTMF control of the node. Having ssh or web access to Supermon is a way around that.

Danny
K5CG
Plano

----- Original Message -----
From: "ARM Allstar" <arm-allstar at hamvoip.org>
To: "ARM Allstar" <arm-allstar at hamvoip.org>
Cc: "Kipton Moravec" <kip at kdream.com>
Sent: Thursday, October 17, 2019 8:46:35 PM
Subject: [arm-allstar] Simplex and Allstar

I am wondering if anyone has experience with linking simplex using Allstar.

The NWS has two counties that use the same frequencies, with different 
PL Tones. Both are a distance away and they interfere with each other. 
An unacceptable solution is for them to stop one net while they talk to 
the other net. At our distance they cannot get us on UHF because the UHF 
antenna is lower on the tower.

An option I was wondering about was bringing up a VHF link or simplex 
channel during a weather net for just the NWS to use.

I know Allstar works in simplex mode, because I see the option in the 
configuration.

What are your thoughts about that idea?

Part 2: If I use a mobile VHF simplex radio, none of them have a COR 
signal to indicate that something is being received. How does that work 
with Allstar? Do I need a special hardware interface if there is no COR 
signal? If so what?

Kip

AE5IB

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