> The FCC has always allowed 850 Hz shift at 45.45 baud from the moment
> hams were first permitted to use FSK. It was initially the *only*
> thing allowed, and it was later (February 1956) that they allowed
> 170 Hz shift. It is a historical precedence. And it has never been
> taken away.
>
> So, I don't think it is correct to say that 500 Hz is their intent.
I disagree. When the Commission adopted 97.221 establishing 500 Hz for
automatically controlled stations (mid 1980's - I wish I remembered
exactly when) 850 Hz shift had not been used regularly for nearly 25
years and the only protocol in common use more than 500 Hz wide was
HF Packet (200 Hz shift, 300 baud or about 550 Hz). Even PACTOR 1
at 200 Hz shift, 200 baud would have only been about 450 Hz wide -
which, of course is the reason the rules are the way they are. The
Vic Poor faction wanted to allow their servers to go anywhere and
answer callers but limit the reach of HF Packet.
73,
... Joe, W4TV
On 11/24/2013 11:20 PM, Kok Chen wrote:
On Nov 24, 2013, at 7:46 PM, Joe Subich, W4TV wrote:
So, 500 Hz definitely does not mesh with the current rules.
500 Hz does not mesh with the maximums *implied by* the current
rules. However, *it does* confirm with the Commission's stated
intent when they established the current rules and the explicit
rule which applies to automatically controlled digital transmissions.
Joe, I still don't think that works.
The FCC has always allowed 850 Hz shift at 45.45 baud from the moment
hams were first permitted to use FSK. It was initially the *only*
thingallowed, and it was later (February 1956) that they allowed
> 170 Hz shift. It is a historical precedence. And it has never been
> taken away.
So, I don't think it is correct to say that 500 Hz is their intent.
73
Chen, W7AY
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