John - KD5YI wrote:
You are wrong about the FCC limits on 13 MHz. There is no mention of 10,000
uV/m. Here are the limits:


Sec. 15.225 Operation within the band 13.110-14.010 MHz.

(a) The field strength of any emissions within the band 13.553-

13.567 MHz shall not exceed 15,848 microvolts/meter at 30 meters.

(b) Within the bands 13.410-13.553 MHz and 13.567-13.710 MHz, the

field strength of any emissions shall not exceed 334 microvolts/meter at

30 meters.

(c) Within the bands 13.110-13.410 MHz and 13.710-14.010 MHz the

field strength of any emissions shall not exceed 106 microvolts/meter at

30 meters.


You are also wrong about the power level required to achieve these limits.
The power required is much lower.

Cheers,
John

There appear to be two sets of part 15.225 rules floating around.
http://frwebgate.access.gpo.gov/cgi-bin/get-cfr.cgi?TITLE=47&PART=15&SECTION=225&YEAR=2001&TYP E=TEXT
shows:
"[Code of Federal Regulations]
[Title 47, Volume 1]
[Revised as of October 1, 2001]
From the U.S. Government Printing Office via GPO Access
[CITE: 47CFR15.225]

[Page 726]

TITLE 47--TELECOMMUNICATION

CHAPTER I--FEDERAL COMMUNICATIONS COMMISSION

PART 15--RADIO FREQUENCY DEVICES--Table of Contents

Subpart C--Intentional Radiators

Sec. 15.225 Operation within the band 13.553-13.567 MHz.

(a) The field strength of any emissions within this band shall not
exceed 10,000 microvolts/meter at 30 meters.
(b) The field strength of any emissions appearing outside of this
band shall not exceed the general radiated emission limits shown in
Sec. 15.209.
(c) The frequency tolerance of the carrier signal shall be
maintained within plus-minus0.01% of the operating frequency over a
temperature variation of -20 degrees to +50 degrees C at normal supply
voltage, and for a variation in the primary supply voltage from 85% to
115% of the rated supply voltage at a temperature of 20 degrees C. For
battery operated equipment, the equipment tests shall be performed
using
a new battery."

And
http://www.fcc.gov/Bureaus/Engineering_Technology/Documents/bulletins/oet63/oet63rev.pdf
Also shows the 10,000uV/M at 30M

Yet http://www.sss-mag.com/pdf/part15-91905.pdf
Dated sept 2005, shows the limits you quoted.

What is troubling is the FCC has different specs on different documents
at fcc.gov.

Buy regardless of runinng 10,000uV or 15,848uV, one does NOT need a
100W
transmitter to reach either of these levels. I have a 2W unit followed
by a step attenuator
coupled to a bufffer with a Zin of 50 Ohms and a Z Out of ~500. The
buffer transistor
is a 250mW and isn't even warm. This was the only easy way to allow
the attenuator
to accurately step the power level down. By the 15,848uV I guess I
could increase
my power from 5,000uV, to allow for the energy in the sidebands, to
something like
10,000uV.

Oh whoopy gea!

Too much trouble to even think about changing as I had to back the
exciter down to something like 1/2W to reach the 5,000uV level.


Crystal Oscillator-buffer#1-amplifier-?20dB pad-step
attenuator-buffer#2-matching-
very poor radiator.

I would guess I am running maybe 5mW into a modified CB ground plane
antenna.
Serious mismatch, but my "beacon" was only intended to reach about 1
mile.
For an S2 reading I had to back the power down ~50% from max legal. So
assume I am running 2.5mW with no attenuation, so for extra credit,
what is my
power level at -63dB?

Terry