[App_rpt] app_rpt setup and requirements.

Mon Oct 9 07:07:29 UTC 2006

As far as the CAT protocol goes, the ARIB board talks to the "Packet Data 
interface", the
6 pin connector (I believe), which has the Tx and Rx audio, PTT and COR. The 
CAT protocol
goes through one of the serial ports on the PC. On the PCI card, we talk to 
the serial
port (CAT port) directly also, all through 1 8 pin cable, (which forks off 
to 2 connectors
one 6 pin and one 8 pin on the back of the Yaesu radio).

Yes we fully support CAT in frequency/mode agile mode along as well as the
Doug Hall RBI-1 as well as the Kenwood TM-G707.

As far as Digium cards supporting E&M goes, I really think there is VERY 
little need
or desire for such things these days.  (Actually the FXS also operates as a 
DPT
like a DID trunk, which technially *is* a 2 wire loop-closure E&M 
Interface).

>From: "Eric Fort" <eric.fort at gmail.com>
>Reply-To: Asterisk Repeater Controler <app_rpt at lists.illiana.net>
>To: "Asterisk Repeater Controler" <app_rpt at lists.illiana.net>
>Subject: Re: [App_rpt] app_rpt setup and requirements.
>Date: Sun, 8 Oct 2006 23:06:01 -0700
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><2ad2af430610081911va4088bdy7217abff1df9176a at mail.gmail.com><200610082209.31185.hwstar at rodgers.sdcoxmail.com>
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>see below:
>
>On 10/8/06, Steve Rodgers <hwstar at rodgers.sdcoxmail.com> wrote:
>>
>>Eric,
>>
>>See below for the answers.
>>
>>
>>On Sunday 08 October 2006 19:11, Eric Fort wrote:
>> > Hopefully those on the list can answer a few questions about getting
>> > app_rpt setup and what is really required.
>> >
>> > 1.  why is the arib needed and what exactly does it do?
>>
>>The main task of the ARIB is to separate the audio from the signaling.
>>FXS connections carry audio (AC) and signalling (DC) on the same twisted
>>pair.
>>The signalling and the audio need to be separated when interfacing to a
>>radio.
>>
>> >
>> > 2.  Why do I need 2 fxs ports for full duplex operation?  my phone is
>>full
>> > duplex when plugged into the same port why can't the audio for the 
>>radio
>> > be?
>>
>> > Come to think of it I can buy a little phone with a headset jack for
>> > next to nothing and have seperate tx (mike) and rx (speaker)
>>audio.  this
>> > just takes a 2 to 4 wire hybrid common to most phones.  why do I need
>>the
>> > arib at all?
>> >
>> > 3.  Why do I need the arib at all?
>>
>>
>>For full-duplex repeater operation 2 FXS ports are an absolute
>>requirement. To
>>see why, keep reading.  If you are not running a repeater, onty one FXS
>>port
>>is needed, and a two wire connection can be used.
>>
>>We prefer to set up repeaters instead of half-duplex configurations like
>>Echolink or IRLP. We feel the full duplex repeater configuration gives us
>>more control as we can issue commands while the transmitter is still
>>transmitting, and we don't have to wait for a transmitter to unkey before
>>starting a new transmission.
>
>
>agreed, the cactus intertie which I use much of the time is full duplex and
>it offers many advantages.
>
>Why the two FXS port requirement for full duplex audio? For full duplex
>>audio
>>(simultaneous receive and transmit) as used with repeaters, no receive
>>audio
>>can be allowed to couple into the transmit audio, without going through
>>audio processing (muting, mixing, etc) first. The hybrid transformers used
>>in
>>phones don't have to be perfect full duplex devices. What I mean by
>>perfect
>>full duplex device, is that no receive audio is discernable in the
>>transmit
>>audio. Phones are not perfect full duplex devices, in fact, some receive
>>audio is purposely introduced in the transmit audio to generate a
>>sidetone.
>>Even the hybrid transformer  is still not going to do an acceptable job of
>>rejecting the receive audio on the transmit port, hence the need for a
>>4-wire
>>connection back to Asterisk using 2FXS ports.
>
>
>thanks for the explaination.  too bad there are not 4 wire modules for the
>DIGIUM cards.  what about using an E&M interface/port for radio interfacing
>(6 wire)?
>
>>
>> > 4.  is the rbi-1 really needed?  what function does it serve?  I've 
>>seen
>> > mention of using an ft-897 directly without it.  How is this done?  why
>>hf
>> > only for the 897 when the 897 covers hf, 6m, 2m, and 440?
>>
>>The RBI-1 is only required it you want to change the frequency of your
>>radio
>>remotely, and you have the Kenwood mobile radios which are compatible with
>>it.
>
>
>does app_rpt speak the cat protocol to a serial port?  can an ft897 be used
>in a frequency agile way, just by plugging it in (to the arib board?  if 
>not
>what would it take to impliment this?  where can I find docs about how this
>setup was made to work for the demo.
>
>>
>> > 5.  what about interfacing other radios used for repeaters such as
>>micor,
>> > maxtrack, etc.
>>
>>We do it all the time. My repeaters are all Motorola Mitrek, or GE Custom
>>MVP.
>>Other guys use Maxtracs, and Desktracs or other synthesized commerial land
>>mobile radios.
>
>
>
>are docs/diagrams available to  show how this is done?
>
>
>>  Thanks,
>>
>>  Eric - kg6kqt
>>_______________________________________________
>>App_rpt mailing list
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>>

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