----- Original Message -----
From: "D. Chester" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Tuesday, November 13, 2007 4:19 AM
Subject: [AMRadio] Re: Legal limit
From: Thomas Adams <[EMAIL PROTECTED]>
Subject: Re: [AMRadio] Re:Reactor Wanted
In the (unlikely) event of an FCC inspection, I doubt that the
inspecting engineer is going to go with
that sort of reasoning and observe such niceties, even tho it IS correct.
The "right" answer in this case is the one that they tested me on for
my (now defunct) 1st Class Radiotelephone
license; the peak power of a carrier at 100 percent modulation is
four times the carrier power. Anything else
leaves too much wiggle room, and opens the door for
lawsuits... especially if your rig doesn't use any sort of
processing tricks like negative peak clippers.
This is a matter of absolutes... and absolutes ONLY exist in
bureaucracy and statutes. In those realms,
reality means little or nothing. And the bureaucracy says that
without processing, PEP equals four times
the power of the unmodulated carrier.
With typical asymmetrical modulation with the male human voice, and the
phase inverted to the "wrong" direction, 100% modulation of one kilowatt
DC input would probably do well to achieve 1500 watts p.e.p. There is
nothing in Part 97 that even mentions 4 times carrier power. What would
the inspector use for SSB, since it has no carrier? Besides, I'd bet they
couldn't even measure the carrier power output from a lot of AM
transmitters presently on the air.
Most likely, they wouldn't have any way to measure anything that is not
fed by 50-ohm coax. What if you use link coupling directly to a tuner
that feeds open wire line, with only a pair of wires to tie the two links
together? Or if you feed the open wire line directly from a pick-up coil
coupled directly to the tank?
Its called a balun, and prepackaged ones of many ratios are readily
available. Clip, clip and measure into the Bird.
Or what about an antenna that is connected
directly to the tank circuit without any feedline or tuner?
Now, that is definitely asking for trouble. I'd hope that no one does that
method any longer.
Bottom line is that Charlie is no more interested in an AMer that is a few
dB over the limit than they are with anyone else running an 8877, 2 x
3CX800, or similar amp on SSB or CW that can easily crank out 2500W.
What gets Charlies attention is the obvious troublemaker or braggart that
thinks its cool to talk about his two 4-1000A's, 4CX5000, etc, meanwhile
being 20 KHz wide.
Im sure we all know at least one SSB op that is running 5KW+ but has never
been bothered. I'd have to take off my shoes and socks to be able to add up
the ones I know of.
Carl
KM1H
My thoughts exactly, regarding p.e.p., can be found by clicking on this
link:
http://www.youtube.com/watch?v=WxmUKVrT0iI
______________________________________________________________
Our Main Website: http://www.amfone.net
AMRadio mailing list
List Rules (must read!): http://w5ami.net/amradiofaq.html
List Home: http://mailman.qth.net/mailman/listinfo/amradio
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:[email protected]
To unsubscribe, send an email to [EMAIL PROTECTED] with
the word unsubscribe in the message body.
______________________________________________________________
Our Main Website: http://www.amfone.net
AMRadio mailing list
List Rules (must read!): http://w5ami.net/amradiofaq.html
List Home: http://mailman.qth.net/mailman/listinfo/amradio
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:[email protected]
To unsubscribe, send an email to [EMAIL PROTECTED] with
the word unsubscribe in the message body.
