V23 transmitter on a pic ?

Hi guys,

I need a V23 TX modem firmware running on a PIC microcontroller (75bps 
transmitter, 450/390Hz FSK). I don't need reception, just transmission, so I 
guess a PIC will largely be able to do it : A look-up table or DDS-based 
approach will be ok, but before starting to code it I just would like to 
check if someone have it already coded...

Many thanks,
Friendly yours,
Robert
www.alciom.com

To contact us, thanks to click on the antispam link below :
http://www.cerbermail.com/?dCSHUxvwpw

Robert Lacoste wrote:

> Hi guys,
> 
> I need a V23 TX modem firmware running on a PIC microcontroller (75bps 
> transmitter, 450/390Hz FSK). I don't need reception, just transmission, so I 
> guess a PIC will largely be able to do it : A look-up table or DDS-based 
> approach will be ok, but before starting to code it I just would like to 
> check if someone have it already coded...
> 
> Many thanks,
> Friendly yours,
> Robert
> www.alciom.com
> 
> To contact us, thanks to click on the antispam link below :
> http://www.cerbermail.com/?dCSHUxvwpw
> 
> 
Hello

I haven't done it but I've seen PIC based alarm systems that included a 
full 300bps modem with tone and dtmf (TX and RX) signaling. The one I 
have here is in a 17C42 at 16MHz.

Paul Bealing
www.pmb.co.nz

The easiest way is to wireup an ISA modem card to the PIC,unless you HAVE to
use some other technology. Wiring is a snap,software is even easier. I used
this scheme 15 years ago(argh,time flys) for some prototype remote energy
controllers.Nice thing is the hardware is already approved and reasonably
'bullet proof'.

Jay

j.b. miller wrote:
> The easiest way is to wireup an ISA modem card to the PIC,unless you HAVE to
> use some other technology. Wiring is a snap,software is even easier. I used
> this scheme 15 years ago(argh,time flys) for some prototype remote energy
> controllers.Nice thing is the hardware is already approved and reasonably
> 'bullet proof'.
> 
> Jay
> 
> 
> 
Does that mean it is easy to use a PIC for creating a filter for SSTV 
use ? Of course with a suitable AD/DA-converter added..

Torbjorn.
(still looking for any suitable C-compiler for my TMS320c50 DSK-kit)

Thanks guys, as I only needed the transmit part of a V23 Uart (the simpler 
side...) I finally coded from scratch a DDS-based FSK routine on a PIC. It 
is working perfectly at 75/300/600bps.

Many thanks again for your answers,
Friendly yours,

-- 
Robert Lacoste
ALCIOM - The mixed signal experts
www.alciom.com

To contact us, thanks to click on the antispam link below :
http://www.cerbermail.com/?dCSHUxvwpw

"Torbj&#4294967295;rn Morka" <la6wla@hotmail.com> a &#4294967295;crit dans le message de news: 
Ag4sd.73859$Vf.3548431@news000.worldonline.dk...
> j.b. miller wrote:
>> The easiest way is to wireup an ISA modem card to the PIC,unless you HAVE 
>> to
>> use some other technology. Wiring is a snap,software is even easier. I 
>> used
>> this scheme 15 years ago(argh,time flys) for some prototype remote energy
>> controllers.Nice thing is the hardware is already approved and reasonably
>> 'bullet proof'.
>>
>> Jay
>>
>>
>>
> Does that mean it is easy to use a PIC for creating a filter for SSTV use 
> ? Of course with a suitable AD/DA-converter added..
>
> Torbjorn.
> (still looking for any suitable C-compiler for my TMS320c50 DSK-kit)