[OZAPRS] Is it life and death.

Hamish Moffatt hamish at cloud.net.au
Sat Apr 3 14:57:18 EST 2004


On Sat, Apr 03, 2004 at 12:09:00PM +0800, Chris Hill wrote:
> For tones of 2110Hz & 2310Hz, and a suppressed carrier frequency of
> 10147.6kHz, an amateur can be transmitting 100W of RF on 10.14991kHz.
> That's 100W of RF energy, less than 90Hz from the band edge.

With 300 baud FSK transmissions I think you will find that the sidebands
will be out of band in that case. The two tones are within the band but
the act of shifting between them creates sidebands.

According to http://cnx.rice.edu/content/m0545/latest/ the bandwidth
is the frequency shift plus the baud rate (for the worst case,
alternating 1s and 0s) for FSK, meaning 500 Hz wide. 

Your tones need to be at least 150 Hz from the band edge to be legal.


Hamish
-- 
Hamish Moffatt VK3SB <hamish at debian.org> <hamish at cloud.net.au>
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