[App_rpt] RE : "How to" for a simplex radio station

Jim Duuuude telesistant at hotmail.com
Tue May 9 05:22:43 EDT 2006


This is one of the many reasons we publish schemtatics for these things:

http://www.zapatatelephony.org/radio_interface/Rev%20C/

If you look, you will see that when polarity is FORWARD (receive mode), DC 
loop closure (provided by your interface) indicates
COR activity to the FXS port. To transmit, the FXS port REVERSES polarity 
(and your interface needs to assure that
the loop is closed at all times when the polarity is reversed, I suggest 
using 2 diodes, to isolate
the tx from the rx circuits (depending upon polarity).

If you want to build it yourself, please feel free to do so.

We have not verified that the tdm24xxp drivers do this properly. I know the 
tdm400's do.
If not please let me know. They should however, since the logic to drive 
each channel
was directly ported from the older driver (supposedly). This could probably 
be easily done
with a regular phone and a meter.

>From: <f6hqz-m at hamwlan.net>
>Reply-To: <f6hqz-m at hamwlan.net>
>To: "'Jim Duuuude'" <telesistant at hotmail.com>,<app_rpt at lists.illiana.net>
>Subject: RE : [App_rpt] "How to" for a simplex radio station
>Date: Tue, 9 May 2006 09:42:04 +0200
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>Hello Jim  :-)
>
>Ah ! Yes ? It is a good info !
>I am wondering for that on a only one FXS port.
>What could be the config files examples in my case ?
>What exactly are the signals for PTT and COR ?
>I want to modify an existing HF transceiver phone patch, not use ARIB
>interface for that.
>Probably a loop closing for COR ?
>And may be a voltage presence or reversed polarity for PTT command ?
>If you describe it, I can interface myself my old military rig  ;-)
>
>For now, I have it on 7045.3 kHz LSB, but RX only, and a Rhode&Schwarz on
>7080.0 kHz LSB.
>This two receivers are available via my Asterisk box from any HAM who want
>to ask me for an IAX2 account, or for your Asterisk network via an IAX2
>trunk if you want.
>
>Have a Nice Day !
>
>Best 73's from F6HQZ,
>Francois BERGERET.
>
>
>-----Message d'origine-----
>De : Jim Duuuude [mailto:telesistant at hotmail.com]
>Envoyé : mardi 9 mai 2006 08:44
>À : app_rpt at lists.illiana.net; f6hqz-m at hamwlan.net
>Objet : Re: [App_rpt] "How to" for a simplex radio station
>
>
>Steve, huh? If you have a digium FXS port, and a simplex radio, you can use
>the port in
>E&M mode (it makes a DPO trunk) and fully implements COR and PTT (simplex
>audio) on
>a 2 wire port just fine.
>
>using duplex < 2 in this configuration with an ARIB in 2 wire mode should
>work fine, and
>it it doesnt, we need to fix it.
>
> >From: Steve Rodgers <hwstar at rodgers.sdcoxmail.com>
> >Reply-To: Asterisk Repeater Controler <app_rpt at lists.illiana.net>
> >To: f6hqz-m at hamwlan.net
> >CC: Asterisk Repeater Controler <app_rpt at lists.illiana.net>
> >Subject: Re: [App_rpt] "How to" for a simplex radio station
> >Date: Mon, 8 May 2006 21:17:31 -0700
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> >
> >
> >Francois,
> >
> >We support simplex operation with the duplex= statement in the node
> >block. Normally the default is duplex=2 which is a full duplex
> >repeater. Duplex=0 is a simplex node with no telemetry, and duplex=1 is
> >a simplex node with telemetry. Telemetry is command responses, ID's,
> >etc.
> >
> >For node use, app_rpt requires 2 FXS ports are required per node (one
> >for
> >TX
> >and one for RX) Regardless if it is duplex or not.
> >
> >
> >On Monday 08 May 2006 05:42, f6hqz-m at hamwlan.net wrote:
> > > Hello Jim and Steve,
> > >
> > > I hope all is fine for you two  :-)
> > >
> > > I am tempting to connect few simplex stations (1 VHF, 1 UHF and 1
> > > HF) to
> >my
> > > Asterisk in my chack.
> > > I want to connect them directly to my TDM2433E card, because I have
> > > "too much" FXS lines available.
> > >
> > > So, I am wondering how to use this FXS lines and I have probably
> > > missed something because I can't. I have searched some examples on
> > > Voi-info, Zapata and QRV web sites, without seen any kind of help
> > > for my usage or few explanations about the method used for COR and
> > > PTT actions through such a FXS.
> >
> >You need our ARIB board for this.
> >
> > >
> > > If I read the zapata. and zaptel.conf exampel files included into
> > > the Asterisk distro, I can see that it seems to be possible to use 2
> >different
> > > kinds of signaling for FXS and radio : E&M or "sf" or "fxsks" or
> > > "fxsgs"
> >in
> > > zaptel.conf, and em_txrx or sf_txrx in zapata.conf...
> > > I don't understand well what I must use for my situation (I don't
> > > know
> >how
> > > works E&M signaling exactly).
> > > I have choosen em_txrx thinking that this could be used on only one
> > > FXS channel to have COR and PTT.
> >
> >E&M is just a placeholder for implementing COR and PTT signalling and
> >only used with the quad radio PCI card.
> >
> >You do it like this...
> >
> >zaptel.conf:
> >
> >fxogs=17 # TX bench test pair channel 17 on channelbank fxols=18 # RX
> >bench test pair channel 18 on channelbank
> >
> >
> >zapata.conf:
> >
> >; Channel 17,18
> >
> >callwaiting=no
> >threewaycalling=no
> >transfer=no
> >context=ext-disconnected
> >mailbox=
> >callerid="Bench TX"<117>
> >signalling=fxo_tx
> >channel = 17
> >
> >signalling=fxo_rx
> >context=ext-disconnected
> >threewaycalling=no
> >callwaiting=no
> >transfer=no
> >mailbox=
> >callerid="Bench RX"<118>
> >channel = 18
> >
> >
> >rpt.conf:
> >
> >[112] ; node block
> >
> >rxchannel = Zap/18                      ; Rx audio/signalling channel
> >; Note: if you use a unified interface (tx/rx on one channel), only ;
> >specify the rxchannel and the txchannel will be assumed from the
> >rxchannel
> >txchannel = Zap/17                      ; Tx audio/signalling channel
> >
> >duplex = 1;		Simplex node with telemetry
> >; Other config stuff for the node block (don't assume that the lines
> >above
> >are
> >all that is required!!!!
> >.
> >.
> >.
> >
> >
> >
> >
> >
> > >
> > > But, I can't access to my "node" when I tempt to call it with
> > > apt(100)
> >or
> > > apt(100|X) into extensions.conf.
> > > Asterisk console tells me :
> > > May  8 14:32:23 WARNING[1562]: app_rpt.c:5866 rpt_exec: Cannot find
> > > specified system node 001
> > >
> > > In my rpt.conf, I have very few lines for this first test link :
> > >
> > > [001]                                   ; Node ID of first repeater
> > > ;VHF Base #1 FT290R
> > > rxchannel = Zap/2                       ; Rx audio/signalling channel
> > > context = HAMWLAN                       ; dialing context for phone
> > > callerid = ""F6HQZ_VHF_BASE1" <77005>   ; Callerid for phone calls
> > >
> > > [nodes]
> > > 001=radio at 127.0.0.1/001,NONE
> > >
> > > So dear OM's, could you help me to start this simplex stations that
> > > I
> >want
> > > to add to your main Asterisk radio network ?
> > > May be it could be nice to write some such paper in the voip-info
> > > wiki
> >to
> > > have a real example to start easyly ?
> > >
> > > I hope to start my radio link before the may 20th, due to a HAMfest
> > > in France with hudreds of HAMs. I will be pleased to annouce and
> > > show this first France/USA radio link
> >with
> > > Asterisk boxes and your RPT application working.
> > >
> > > For now, I have (too) few HAM's connected to my Asterisk box,
> > > chating together, but having only receivers access (2 HF RX on 7 MHz
> > > band).
> > >
> > > If you want check my HF listening channels, I can give you an IAX2
> >account
> > > or we can create an IAX2 trunk immediatly that could be used later
> > > for
> >our
> > > future radio link between our two countries.
> > >
> > > Best 73's,
> > > F6HQZ,
> > > Francois BERGERET,
> > > France.
> >_______________________________________________
> >App_rpt mailing list
> >App_rpt at lists.illiana.net
> >http://lists.illiana.net/mailman/listinfo/app_rpt
>
>





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