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'PIC - Packet Modem ?'
1999\03\04@075151 by Glenville T. Sawyer

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Glenville T. Sawyer  -    South Australia
Theatre, Concert Lighting, Special Effects, Props. & more !
Embedded Control systems for Theatrical & other  Applications
http://gsawyer.mtx.net/


Here is one question for all of the (many) Amateur Radio operators that
frequent this list.

Rumour has it that  a PIC Based Modem - (BayCom style) or a simple TNC was
developed
recently, does anyone have any details of where / whom etc etc ?

 I have a requirement to construct a demo' device - with similar functions
for a local
emergency service froup - basically a simple keypad, 2*16 LCD and not very
much else apart from the
radio interface (PTT / A.F-in / A.F out).

Any clues would be appreciated.
  Glenville

vk5zcf

1999\03\04@110006 by Dave VanHorn

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>
> Here is one question for all of the (many) Amateur Radio operators
that
>frequent this list.
>
> Rumour has it that  a PIC Based Modem - (BayCom style) or a simple
TNC was
>developed
>recently, does anyone have any details of where / whom etc etc ?


Not baycom.. PIC-E through TAPR  http://www.tapr.org
You have to be a TAPR member to get one though.

1999\03\04@154134 by odney A.

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Actually, non-TAPR members can buy kits, etc.
from TAPR.  Just at a higher price.  However,
the PIC-E is just in evaluation of 50 units
(now cut off) and once the evaluation is completed
it will be determined to produce the kits or
go back to the drawing board.

Rod
KB3MK


> {Original Message removed}

1999\03\04@222457 by Dave VanHorn

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>Actually, non-TAPR members can buy kits, etc.
>from TAPR.  Just at a higher price.  However,
>the PIC-E is just in evaluation of 50 units
>(now cut off) and once the evaluation is completed
>it will be determined to produce the kits or
>go back to the drawing board.
>
>Rod
>KB3MK


Last I read, the first 50 were only avail to members.

1999\03\05@094601 by John Hansen

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At 10:22 PM 3/4/99 -0500, you wrote:
>>Actually, non-TAPR members can buy kits, etc.
>>from TAPR.  Just at a higher price.  However,
>>the PIC-E is just in evaluation of 50 units
>>(now cut off) and once the evaluation is completed
>>it will be determined to produce the kits or
>>go back to the drawing board.
>>
>>Rod
>>KB3MK
>
>
>Last I read, the first 50 were only avail to members.

As someone on the design team for this project, I thought I might clear up
a few points.  First, the PIC-E is not a stand-alone TNC or a modem.  It is
designed to be a general purpose interface between the digital and analog
world (especially in a radio context).  It contains a PIC programmer on
board, so users can change what the device does, as needed.  Currently,
programming is available that will make it function as a mic-encoder for
taking GPS data and retransmitting the position reports as 1200 baud AX.25
UI frames over radio.  Programming is also completed which will allow it to
operate as a weather node.

In its current incarnation, there is probably not enough horsepower to make
it into a general purpose terminal node controller.  This is because there
is no memory on the unit other than the memory that is on-board in the F84.
To do receive packet, the unit would have to have enough memory to hold an
entire frame so it could do the CRC check before sending it out the serial
port.  The F84's memory is insufficient to accomplish this.  It is
anticipated, however, that a redesign will occur when the new PIC flash
chips are available.  The 16F877, for example would have over 300 bytes of
memory, which should be adequate.   There is a modem chip on-board; the
MX-COM MX614.

The first 50 units were intended to go to people who were willing to accept
the risks of experimentation with something that is currently in beta form.
This is one of the reasons that the first run was indeed limited to TAPR
members.  Within the next couple of months, minor changes will be made
(based on the input from the Beta group) and a larger run will be
undertaken.  At that time, they will be for sale to anyone, though TAPR
members will receive a discount (I think its about 10%).  I'm not in charge
of pricing, but I would be surprised if the price were to go up much for
this run.  The first units were sold for $49.95.

One of my longer term projects is to develop a complete KISS TNC using a
PIC.  That's one of the reasons I became involved in this project; to learn
to do AX.25 packets using a PIC chip.  Ultimately, it seems to me possible
to do a 9600 baud full duplex TNC (suitable for digital satellite work) for
under $50.  I still quite a long way from finishing this, however, as its
being worked in around other more pressing projects.

John Hansen
Amateur Radio Callsign: W2FS

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