RE: 300bps Packet

["Tsutsumi Family" <oakie@xxxxxxxxxxxxxxxxx>]

Andrew,

Yes, I wished to say, after reading Dave's explanation, that SSB mode
dominated on HF does not matter the frequency values of two tones as long as
the gap is maintained, i.e. 200Hz gap for 300bps operation and now I am
guessing the soundmodem users who knew this were successful for the
operation. 

My word "conventional" means for the hardware TNCs from historical
viewpoints.

Regards,

take

de JA5AEA

-----Original Message-----
From: Andrew Errington [mailto:a.errington@xxxxxxxxxxxxxxx] 
Sent: Wednesday, November 24, 2010 8:22 PM
To: Tsutsumi Family
Cc: 'Dave Platt'; linux-hams@xxxxxxxxxxxxxxx
Subject: Re: 300bps Packet

On Wed, 24 Nov 2010 19:31:25 you wrote:
> Dave,
>
> Thank you for providing the tutorial of SM source codes.
>
> As one of ways to solve 300bps SSB operation without any code change, you
> are suggesting to use the frequency setting of f0 and f1 to less than 4 x
> 300bps =1,200 Hz such as 800Hz and 1,000Hz, not conventional 2,100Hz and
> 2,300Hz.
>
> Correct?
>
> Regards,
>
> take

Hi,

There are no 'conventional' tones for HF modems.  Here's a site that gives a

good explanation why:
http://wa8lmf.net/aprs/SSB_Frequencies.htm

Here are two websites listing commonly found tone frequencies:
http://vk3.aprs.net.au/aprs_on_hf.htm
http://www.aprs.net.au/hf/hf-modem-tones

HTH,

73,

Andrew
HL5/ZL3AME

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