In article ,
Jon Teske wrote:
On Wed, 14 Mar 2007 13:54:04 +0000 (UTC), (Geoffrey
S. Mendelson) wrote:
Scott Dorsey wrote:
Not at all. It just mandates a certain power input to the finals.
At one time it DID mandate something like "local communications only".
I can't remember the exact wording, so I leave it in quotes.
Note that Class D wasn't all there was. There was Class C which allowed
pulse modulation in the 26 MHz range for remote control, and Class A
citizens band which was AM in the 450 MHz range. I don't recall what
Class B was.
I had a class C and D license. The difference was ticking a box on the
application.
Geoff.
Since I never operated CB except for one short contact in my carpool
mate's car to show him how it worked, I was not intimately familiar
with CB rules. I seem to remember thought that there were regulation
which prohibited even attempting to make a contact of over 200 miles
this was one of the ways to attempt to rein in the use of powerful
(or so) even if conditions permitted this.
I can confirm the existance of 'distace' restriction. As I recall, it
is 150 mi., not 200.
I seem to remember that
amplifiers that many CBers used (of course the prohibition of the sale
of amps capable of operation in that range, including those intended
for ham use, was another FCC mandate.)
Anyone know more about that??
Note: the amps were illegal regardless, as there was a limit of watts of
power in to the final amp, and a maximum of 4 watts RF energy out.
It is worth noting that when 'skip' conditions were right, it did not
take large amounts of RF to reach long distaces. I used an '11 meter'
(but _not_ 'citizens band') rig with just under 2-1/8 watts (measured!)
RF out, and one day was asked to shut down, by a station nearly 900 miles
distant. I was _so_strong_ in their area that legal max (10 watt RF)
stations couldn't communicate at 6 blocks distance.
I don't know the licensing requirements, but I think that there is
also a frequency or frequencies at 72 MHZ available for radio control
of models in addition to 26MHz; and, 50 MHz if one is a licensed
amateur.
Anyone up on that?
"way back when", there was 2nd set of frequenceis, besides the 11m ones
for RC controls. I don't remember at this remove (roughly 30 years) just
where it was. Was not used much, gear was much more expensive.
And yes, there were some ham frequencies where RC operations were allowed.