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PICList Thread
'TCM3105 to PIC'
1998\02\24@050647 by Ken Parkyn

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Hello again all;

I have an associate who has been using a TCM3105 modem chip in
packet radio applications.
These are no longer available at an affordable price.
Does anyone know whether someone has already done this in a PIC,
or if there is a similar chip which will do the job?

We also are interested in a PIC based clock which displays two
timezones, local and GMT time.
Has this been done, and if so can someone please point me in the
right direction?

Cheers
______________________________________
Ken Parkyn              email: spam_OUTK.ParkynTakeThisOuTspamsct.gu.edu.au
Office of Technical Services,  Electronics Workshop
GRIFFITH UNIVERSITY Nathan Qld.4111 Australia
P.O.Box 185  Ph:(07)3875 7289    Fax:(07)38757151
________________________________________

1998\02\24@142956 by Mike Keitz

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On Tue, 24 Feb 1998 16:23:53 -0800 Ken Parkyn <.....k.parkynKILLspamspam@spam@SCT.GU.EDU.AU>
writes:
>Hello again all;
>
>I have an associate who has been using a TCM3105 modem chip in
>packet radio applications.
>These are no longer available at an affordable price.
>Does anyone know whether someone has already done this in a PIC,
>or if there is a similar chip which will do the job?

I've used a MC145447 chip for packet radio.  This Motorola device is
inteneded for caller-ID receivers, so it only receives the tones, it
doesn't send them.  However, it works better than a 3105 and uses less
power.  Also it doesn't need threshold adjustment like a 3105 does.  For
sending, use software in a PIC, generating DDS sine waves and outputting
them to a resistor tree or DAC.  The PIC can also serve as a DCD
discriminator, allowing the radio to be used without squelch.

>
>We also are interested in a PIC based clock which displays two
>timezones, local and GMT time.
>Has this been done, and if so can someone please point me in the
>right direction?

I'm sure any of the PIC clock projects could be modified readily to do
that.

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1998\02\24@145515 by Chris Eddy

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Ken;
I found myself up against the same predicament a year or so ago.  I
re-designed the product to operate using a Silicon Systems (TDK) part
73S223.  The major difference is the lack of carrier detect output.  And
it is V23 only, no 202T.  The other option is an OKI part, which is
actually quite large, in a 600 mil plastic package.  I abandonned the
PIC based reception after some fruitless investigation.  G'luck.

Chris Eddy, PE

Ken Parkyn wrote:

{Quote hidden}

1998\02\24@152355 by alex_holden

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Earlier I sent a message to .....K.ParkynKILLspamspam.....sct.gu.edu.au in reply to his query
about TCM3105 modem chips. It was bounced back at me with the error
message "552 <EraseMEalex_holdenspam_OUTspamTakeThisOuTgeocities.com>... We don't accept spam".
If you want people to help with your query, maybe you should reconsider
indiscriminately banning whole domains...
Note that I am strongly against the use of unsolicited commercial email,
but I do think it is going too far when you start banning whole domains
from sending messages to you.
--
------------------- Linux- the choice of a GNU generation.
--------------------
: Alex Holden- Caver, Programmer, Land Rover nut, and Radio amateur (M1
CJD). :
-------------- www.geocities.com/CapeCanaveral/Lab/1532/
---------------

1998\02\25@050335 by Leon Heller

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In message <34F36499.6D0664BAspamspam_OUTsct.gu.edu.au>, Ken Parkyn
<@spam@k.parkynKILLspamspamSCT.GU.EDU.AU> writes
>Hello again all;
>
>I have an associate who has been using a TCM3105 modem chip in
>packet radio applications.
>These are no longer available at an affordable price.
>Does anyone know whether someone has already done this in a PIC,
>or if there is a similar chip which will do the job?

I think that the Baycom team has done something like this.

Leon
--
Leon Heller: KILLspamleonKILLspamspamlfheller.demon.co.uk http://www.lfheller.demon.co.uk
Amateur Radio Callsign G1HSM    Tel: +44 (0) 118 947 1424
See http://www.lfheller.demon.co.uk/dds.htm for details of my AD9850
DDS system. See " "/diy_dsp.htm for a simple DIY DSP ADSP-2104 system.

1998\02\25@111516 by alex_holden

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Leon Heller wrote:
> >I have an associate who has been using a TCM3105 modem chip in
> >packet radio applications.
> >These are no longer available at an affordable price.
> >Does anyone know whether someone has already done this in a PIC,
> >or if there is a similar chip which will do the job?
>
> I think that the Baycom team has done something like this.

No, actually I asked them a few weeks ago and they responded that they
still have quite a large stock of TCM3105s, but only supply them as part
of their 1K2 modem kits. Perhaps you're thinking of the PICPAR, which
uses a PIC16C84 to replace all of the digital circuitry which was
present in their PAR96 modem.

--
------------------- Linux- the choice of a GNU generation.
--------------------
: Alex Holden- Caver, Programmer, Land Rover nut, and Radio amateur (M1
CJD). :
-------------- www.geocities.com/CapeCanaveral/Lab/1532/
---------------

1998\02\26@043110 by paulb

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Chris Eddy wrote:

> I re-designed the product to operate using a Silicon Systems (TDK)
> part 73S223.  The major difference is the lack of carrier detect
> output.

 Well, as Mike Keitz mentions, or implies, that is really no loss.

> I abandoned the PIC based reception after some fruitless
> investigation.

 Not surprising.  PICs aren't really into DSP (though Microchip makes,
or at least made, DSP engines too).

 And Mike Keitz wrote:

> I've used a MC145447 chip for packet radio.  This Motorola device is
> intended for caller-ID receivers, so it only receives the tones, it
> doesn't send them.  However, it works better than a 3105 and uses less
> power.

 Considering the popularity of parasitically powering the 3105 from a
COM port, something using LESS power again sounds intriguing!

> Also it doesn't need threshold adjustment like a 3105 does.

 Well, not *too* much of a problem really. I trust everyone knows about
the mode selection bug in the TCM3105 and the need to use an inverter to
fix this?

> For sending, use software in a PIC, generating DDS sine waves and
> outputting them to a resistor tree or DAC.

 Well, why not!(?)  4 resistors should do fine (how many does the
PICPAR use?).  Nevertheless, an XR2206 makes a perfectly good and
inexpensive modulator.

>  The PIC can also serve as a DCD discriminator, allowing the radio to
> be used without squelch.

 The use of a PIC to execute the "state machine DCD" function is of
some interest.  Is that what you did Mike?  Care to share details?

 Cheers,
       Paul B.

1998\02\27@002020 by STEENKAMP [M.ING E&E]

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Hi,

> Hello again all;
>
> I have an associate who has been using a TCM3105 modem chip in
> packet radio applications.
> These are no longer available at an affordable price.
> Does anyone know whether someone has already done this in a PIC,
> or if there is a similar chip which will do the job?
>
Has the TCM3105 been officially discontinued?

Niki

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