[dorkbotdc-blabber] AFSK tone generator

[Bjorn Westergard]

Hmm... I think your best bet here might be to write a script to
generate a raw PCM stream (in other words, write raw bytes to a file
which you can cat to /dev/audio). The timing of all this likely has to
be dead on.

2008/8/14 Rob Carlson <rob at vees.net>:
> I'm trying to send NWS SAME messages to a weather radio rechipped for a two
> meter ham frequency.
>
> via Wikipedia:
>
> The system transmits digital tones over normal audio using AFSK, with a
> 2083.3 Hz mark tone and 1562.5 Hz space tone, lasting 1920 μs (1.92 ms)
> each. The data is encoded in 7-bit ASCII but uses all 8 bits, with no parity
> bit and no stop bit ("8-N-0"), at a bitrate of 520.83 bits per second
>
> --
> Rob Carlson  rob at vees.net  http://vees.net/
>
> On Thu, 14 Aug 2008, Bjorn Westergard wrote:
>
>> AFSK is kind of vague... what frequences and modulation rates?
>>
>> On Thu, Aug 14, 2008 at 2:21 PM, Rob Carlson <rob at vees.net> wrote:
>>>
>>> I'm looking for a good and dead simple software AFSK tone generator for
>>> Linux, Mac, or PC.  I want to generate a series of short messages.
>>>
>>> --
>>> Rob Carlson  rob at vees.net  http://vees.net/
>>> ........................................................................
>>> .......dorkbot dc: people doing strange things with electricity.........
>>> ................... http://dorkbot.org/dorkbotdc .......................
>>> ........................................................................
>>>
>>
>>
>>
>> --
>> - Bjorn
>> ........................................................................
>> .......dorkbot dc: people doing strange things with electricity.........
>> ................... http://dorkbot.org/dorkbotdc .......................
>> ........................................................................
>
> ........................................................................
> .......dorkbot dc: people doing strange things with electricity.........
> ................... http://dorkbot.org/dorkbotdc .......................
> ........................................................................
>



-- 
- Bjorn