[pskmail] Re: [pskmail] STANAG 4285 legal in the US? (was: Re: Re: Server & Hamlib Question....)
- From: Rein Couperus <rein@xxxxxxxxxxxx>
- To: pskmail@xxxxxxxxxxxxx
- Date: Sun, 30 Sep 2007 17:13:00 +0200
I know where this argumentation comes from. Bonnie will do anything to make us
believe the ALE stuff is legal. I especially like the "only one carrier is
transmitted at any time" phrase.
This describes frequency hopping. If I would put a DirectSequence signal on the
air with this
"300 Baud maximum" definition and chose the frequencies properly I could
generate a signal blanketing the complete 20 meters band, and people would not
like me very much for it.
I am sure the 300 Baud definition comes from "300 Bd ASCII", which is 28 cps.
Anything else looks like legal humbug and selective interpretation... It sounds
a bit like the Pactor3 stations operating in the 500 Hz bandwidth-limited 30
meters band, who will tell you that it is perfectly legal to do so because they
started the qso in pactor1 mode and they are not responsible for their SCS box
switching to P3.
73 :-)
Rein PA0R
> -----Ursprüngliche Nachricht-----
> Von: pskmail@xxxxxxxxxxxxx
> Gesendet: 30.09.07 16:24:07
> An: pskmail@xxxxxxxxxxxxx
> Betreff: [pskmail] STANAG 4285 legal in the US? (was: Re: Re: Server & Hamlib
> Question....)
>
> 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
>
>
>
>
>
--
http://pa0r.blogspirit.com
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