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

wrote:
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.


The first reference above appears to have been published in 2001. I can't
tell the publication date of your second reference.

Personally, I would take the 2005 publication date as gospel.

(snip remainder)

John - KD5YI wrote:
wrote:
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.


The first reference above appears to have been published in 2001. I can't
tell the publication date of your second reference.

Personally, I would take the 2005 publication date as gospel.

(snip remainder)

The second one (the bulletin from the office of Engineering and
Technology) is from 1996. I would go with the 2005 one. That means my
field strength can be more Hurray!!

Todd N9OGL
OMEGA ONE RADIO
13.556.00 MHz LSB

wrote:


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


Your question makes no sense. What is the reference level? 1 watt, 1 mW, 5
mW, 2.5 mW?

..5 microwatts is 63 dB below a Watt.
..5 nanowatts is 63 dB below a milliwatt.
2.5 nanowatts is 63 dB below 5 milliwatts.
1.25 nanowatts is 63 dB below 2.5 milliwatts. (Is this the one you want?)

2.5 milliwatts is 3 dB below 5 milliwatts.

See a pattern in any of this?

John - KD5YI wrote:
wrote:


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


Your question makes no sense. What is the reference level? 1 watt, 1 mW, 5
mW, 2.5 mW?

.5 microwatts is 63 dB below a Watt.
.5 nanowatts is 63 dB below a milliwatt.
2.5 nanowatts is 63 dB below 5 milliwatts.
1.25 nanowatts is 63 dB below 2.5 milliwatts. (Is this the one you want?)

2.5 milliwatts is 3 dB below 5 milliwatts.

See a pattern in any of this?

Once again I see why I should not take up comedy.
It wasn't a serious question.

I was reffereing to 5mW at 50 Ohms.

Terry

In article om,
wrote:

John - KD5YI wrote:
wrote:


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


Your question makes no sense. What is the reference level? 1 watt,
1 mW, 5 mW, 2.5 mW?

.5 microwatts is 63 dB below a Watt. .5 nanowatts is 63 dB below a
milliwatt. 2.5 nanowatts is 63 dB below 5 milliwatts. 1.25
nanowatts is 63 dB below 2.5 milliwatts. (Is this the one you
want?)

2.5 milliwatts is 3 dB below 5 milliwatts.

See a pattern in any of this?

Once again I see why I should not take up comedy. It wasn't a serious
question.

I was reffereing to 5mW at 50 Ohms.

Fewer people would get confused by posts if dBm instead of dB were used
when transmit power level or receiver sensitivity is spoken. I know I
would.

dB being a relative measure should only be used when speaking of a
component like an attenuator or amplifier not a level of power and just
invites the possibility of confusing the reader.

--
Telamon
Ventura, California