[rescue] OT: Linux and USB on Intel
mcguire at neurotica.com
Mon Apr 21 13:22:52 CDT 2003
On Monday, April 21, 2003, at 01:56 PM, Kevin Loch wrote:
> According to FCC rules part 97:
> Output power on most bands is limited to 1500W PEP (peak envelope
> power) output from the transmitter. "Peak Envelope Power" is a
> of the voltage output of the transmitter and the impedance
> of the antenna system. Therefore the power output of the transmitter
> is limited, but not antenna gain. In no case is there a
> limit of power into the 'final stage' of the transmisster.
It's certainly possible that I'm misremembering this, but I'm pretty
sure about it. I have an FCC rule book here; I will look it up this
afternoon to see where I've gone wrong.
But for now, a quick google turned up this:
> Under the old rules the limit was 1,000 watts input to the final
amplifying stage for CW. > Well, if you tuned up on the air, which
nobody ever did, the theory was that you
> calculated the power input from B+ voltage and total of grid and
plate current. At 65%
> efficiency you could legally pump 650 glorious hot watts into your
> But, for phone I believe the limit was 2,000 watts peak envelope
power (PEP) input to
> the final amplifying stage. God help me if I make an error here.
> Big Brother was lobbied by somebody, or they blinked or caved and
legal limit was reset
> the to 1,500 watts output, CW or PEP, at the amplifier output
> Another but, isn't there a correlation between the power of these
> and gravity? Let's see - 650 watts to maybe 1,500+ watts. I dough no,
twice, thrice the
> weight? They used to make some of em in two pieces, with separate HV
power supply on the
> floor and RF deck on the table. Hell - they're twice, thrice as heavy
now and they put
> every thing in one big box and I can't pick the son-of-a-bitch up.
...which suggested that those rules have indeed been changed, so
ignore what I said earlier, and I apologize if I misled anyone. This
was found at:
> Such a limit would have no effect since any ammount of
> gain could be applied in the 'final stage'.
Not true...the output power of an amplifier cannot exceed the power
fed into the amplifier. I'm talking the *power supply* here, not the
RF drive. If you have, say a 2.5kV plate supply capable of supplying
100mA of current, you won't see more than 250W of power out of that
Dave McGuire "She's a cheek pincher. I have scars."
St. Petersburg, FL -Gary Nichols
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