[pskmail] STANAG 4285 legal in the US? (was: Re: Re: Server & Hamlib Question....)
- From: Per Crusefalk <per@xxxxxxxxxxxx>
- To: pskmail@xxxxxxxxxxxxx
- Date: Sun, 30 Sep 2007 16:23:25 +0200
On fre, 2007-09-28 at 08:09 -0700, Rob Frohne wrote:
> I noted your previous note about STANAG 4285. I'm sure you must have
> seen Charles Brain's experiments with it.
> http://www.chbrain.dircon.co.uk/hfemail.html Is what you are working on
> going to be legal in the US?
Been thinking about the interesting regulations in the US...
I noticed something interesting on this page:
http://hflink.com/alehamradiousa/
I am refering to this part:
"Does the ALE RF Signal Meet the FCC "300 Baud Rule" for Data mode?
Yes. The ALE (MIL-STD 188-141B or FED-STD-1045) signal is transmitted at
125 symbols per second. It is legal under FCC Rules for use in the
Amateur Radio Service for DATA MODE transmission on HF in the DATA
sub-bands. Current FCC Rules in USA allow DATA modes up to 300 baud (300
symbols per second) in HF data subbands. Symbol rate (baud) is the
number of state changes the transmitted signal makes per second. The ALE
signal is 8FSK (8 Frequency Shift Keyed). 8 discrete tone frequencies
are spaced 250 Hz apart from 750 Hz to 2500 Hz at audio baseband. A
single tone is being transmitted at any given instant on any one of
these 8 frequencies. No more than one tone is transmitted at a time.
Each symbol represents three bits of data, resulting in an over-the-air
data rate of 375 bits per second (375bps) using "125 baud"."
STANAG 4285 & MIL-STD 188-110A use 8-PSK to provide up to 2400 bps (not
8-FSK as in the example). The big issue is if they are correct in
thinking that its the baud rate that matters (and not the actual data
rate)?
73 de Per, sm0rwo
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