[hpsdr] eSSB for SDR's

[Tony Langdon]

At 06:34 PM 8/26/2012, Glenn Thomas wrote:
>***** High Performance Software Defined Radio Discussion List *****
>
>Hi all.
>
><FYI>
>
>In the USA, transmission bandwidths are regulated by 97.307(a) of 
>the FCC rules, which reads, "No amateur station transmission shall 
>occupy more bandwidth than necessary for the information rate and 
>emission type being transmitted, in accordance with good amateur 
>practice." This is rather general. Based on the required bandwidth 
>for a telephone conversation, which is somewhere between 2.7 and 3.0 
>KHz, the maximum bandwidth for an SSB emission (from a US station) 
>is this same 2.7 to 3 KHz. Likewise, for a full DSB AM signal, the 
>same rule indicates to me that the maximum bandwidth is more like 6 KHz.

2 comments:

1.  "Necessary bandwidth" is a fuzzy concept - necessary for (1) 
basic intelligible speech?  (2) clearly intelligible speech (i.e. 
sibilants)?  (3) faithful reproduction of speech, with a natural sound?

2.  It's easier to beg forgiveness than ask for permission.  In other 
words, provided you respect other band users and the spirit of the 
rules, then trying eSSB when things are quiet may eventually lead to 
more clarity.

73 de VK3JED / VK3IRL
http://vkradio.com


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