Roy Lewallen wrote:
Brenda Ann wrote:

"John - KD5YI" wrote in message

. . .


My guess is 3 mW.

John


The level is the same as emissions within the CB band:


Sec. 15.227 Operation within the band 26.96-27.28 MHz.

(a) The field strength of any emission within this band shall not
exceed 10,000 microvolts/meter at 3 meters. The emission limit in this
paragraph is based on measurement instrumentation employing an average
detector. The provisions in Sec. 15.35 for limiting peak emissions apply.
. . .


The amount of power applied to an isotropic radiator which will generate
10,000 uV/m at 3 meters is 30 microwatts. This assumes that the 3 meter
distance is in the far field, or that it's measured in the far field and
extrapolated to 3 meters as though 3 meters were in the far field, which
is the method and assumption used by the FCC.

A simple dipole reduces the permissible power to about 23 uW, and ground
reflections will typically nearly double the field strength, so a safe
power level would be about 6 microwatts into a dipole antenna over
ground for someone interested in conforming to the regulations.

Roy Lewallen, W7EL


Hey, Roy -

My 3 mW answer was for 30 meters. I think that ratios correctly to your 30
microwatts at 3 meters. Yes?

John

John - KD5YI wrote:

Hey, Roy -

My 3 mW answer was for 30 meters. I think that ratios correctly to your
30 microwatts at 3 meters. Yes?

Yep, that's right. And I finally got curious enough to look up the
actual regulation. According to section 15.225(a), intentional radiators
at 13.553-13.567 MHz are allowed 15,848 uV/m at 30 meters, which is
about 4.75 mW to an isotropic antenna in free space. There's also a
0.01% frequency stability requirement which would imply crystal control.
And any emissions extending outside the band have to be about 54 dB
lower, 30 uV/m at 30 m.

Roy Lewallen, W7EL

Roy Lewallen wrote in
:

John - KD5YI wrote:

Hey, Roy -

My 3 mW answer was for 30 meters. I think that ratios correctly to your
30 microwatts at 3 meters. Yes?

Yep, that's right. And I finally got curious enough to look up the
actual regulation. According to section 15.225(a), intentional radiators
at 13.553-13.567 MHz are allowed 15,848 uV/m at 30 meters, which is
about 4.75 mW to an isotropic antenna in free space. There's also a
0.01% frequency stability requirement which would imply crystal control.
And any emissions extending outside the band have to be about 54 dB
lower, 30 uV/m at 30 m.

Roy Lewallen, W7EL



So if N9OGL's transmitions are legal power wise, he would basically be
broadcasting for the kids across the street. Maybe he could take song
requests. They can just shout out their front doors what songs they want
him to play.

SC

So if N9OGL's transmitions are legal power wise, he would basically be
broadcasting for the kids across the street. Maybe he could take song
requests. They can just shout out their front doors what songs they want
him to play.

SC

I can copy perhaps 8 beacons on 13.555 MHz from all across the U.S.
Assuming they too are running the power level Roy calculated, N9OGL's beacon
should also be copyable.

Dale W4OP

"Dale Parfitt" wrote in
news:R0aCg.15333$l95.9940@trnddc08:



So if N9OGL's transmitions are legal power wise, he would basically be
broadcasting for the kids across the street. Maybe he could take song
requests. They can just shout out their front doors what songs they
want him to play.

SC

I can copy perhaps 8 beacons on 13.555 MHz from all across the U.S.
Assuming they too are running the power level Roy calculated, N9OGL's
beacon should also be copyable.

Dale W4OP


You don't need to tell me the strengths of CW. I'm a CW advocate.
Just listen to the NCDXF beacons on 14.100. You can easily hear the 100mW
tone all over the world when there is propagation with a simple antenna.
I'm just saying the RF Todd is puting into his antenna has to be quit low
if he is transmitting legal power wise.

Sc

"Slow Code" wrote in message
nk.net...
"Dale Parfitt" wrote in
news:R0aCg.15333$l95.9940@trnddc08:



So if N9OGL's transmitions are legal power wise, he would basically be
broadcasting for the kids across the street. Maybe he could take song
requests. They can just shout out their front doors what songs they
want him to play.

SC

I can copy perhaps 8 beacons on 13.555 MHz from all across the U.S.
Assuming they too are running the power level Roy calculated, N9OGL's
beacon should also be copyable.

Dale W4OP


You don't need to tell me the strengths of CW. I'm a CW advocate.
Just listen to the NCDXF beacons on 14.100. You can easily hear the 100mW
tone all over the world when there is propagation with a simple antenna.
I'm just saying the RF Todd is puting into his antenna has to be quit low
if he is transmitting legal power wise.

Sc


I too enjoy CW- probably 90% of my operating. My comment was that if his ERP
is the same as the other beacons, then he will be heard well beyond "across
the street".

W4OP

Dale Parfitt wrote:

"Slow Code" wrote in message
nk.net...
"Dale Parfitt" wrote in
news:R0aCg.15333$l95.9940@trnddc08:



So if N9OGL's transmitions are legal power wise, he would basically be
broadcasting for the kids across the street. Maybe he could take song
requests. They can just shout out their front doors what songs they
want him to play.

SC

I can copy perhaps 8 beacons on 13.555 MHz from all across the U.S.
Assuming they too are running the power level Roy calculated, N9OGL's
beacon should also be copyable.

Dale W4OP


You don't need to tell me the strengths of CW. I'm a CW advocate.
Just listen to the NCDXF beacons on 14.100. You can easily hear the 100mW
tone all over the world when there is propagation with a simple antenna.
I'm just saying the RF Todd is puting into his antenna has to be quit low
if he is transmitting legal power wise.

Sc


I too enjoy CW- probably 90% of my operating. My comment was that if his ERP
is the same as the other beacons, then he will be heard well beyond "across
the street".

The beacon 'HI' is my regular here. Operating on 13558v in CW from Connecticut.
Audible at 1545.

dxAce
Michigan
USA

"Dale Parfitt" wrote in
news:CKFCg.56002$gU4.47279@trnddc07:


"Slow Code" wrote in message
nk.net...
"Dale Parfitt" wrote in
news:R0aCg.15333$l95.9940@trnddc08:



So if N9OGL's transmitions are legal power wise, he would basically
be broadcasting for the kids across the street. Maybe he could take
song requests. They can just shout out their front doors what songs
they want him to play.

SC

I can copy perhaps 8 beacons on 13.555 MHz from all across the U.S.
Assuming they too are running the power level Roy calculated, N9OGL's
beacon should also be copyable.

Dale W4OP


You don't need to tell me the strengths of CW. I'm a CW advocate.
Just listen to the NCDXF beacons on 14.100. You can easily hear the
100mW tone all over the world when there is propagation with a simple
antenna. I'm just saying the RF Todd is puting into his antenna has to
be quit low if he is transmitting legal power wise.

Sc


I too enjoy CW- probably 90% of my operating. My comment was that if his
ERP is the same as the other beacons, then he will be heard well beyond
"across the street".

W4OP

I'll try to copy a few of those beacons. Maybe there is info on about the
stations, and possible they have a waiver for an increase in power or
antenna size.

Sc

Slow Code wrote:
Roy Lewallen wrote in
:



So if N9OGL's transmitions are legal power wise, he would basically be
broadcasting for the kids across the street. Maybe he could take song
requests. They can just shout out their front doors what songs they want
him to play.

SC

Not true.
I have an AM "beacon" running some test groups smack dab
in the middle of the HiFer/ISM 22M allocation. At maximum power
I am at the legal limit. Most of my tests are -20dB from that level and
I
have copied my "becaon" from over 100 miles away twice. I was -6dB
down from max, and was rather shocked. Don't rule out the odd fluke
path.

If you ever hear a YL reading a set of word pairs each followed by
a ID nubmber in cut morse, that is my odd little station.

I normally keep the power -63dB down from max legal, and only boast
it while actually conducting tests.

Terry in central KY

wrote in message
oups.com...

Slow Code wrote:
Roy Lewallen wrote in
:



So if N9OGL's transmitions are legal power wise, he would basically be
broadcasting for the kids across the street. Maybe he could take song
requests. They can just shout out their front doors what songs they want
him to play.

SC

Not true.
I have an AM "beacon" running some test groups smack dab
in the middle of the HiFer/ISM 22M allocation. At maximum power
I am at the legal limit. Most of my tests are -20dB from that level and
I
have copied my "becaon" from over 100 miles away twice. I was -6dB
down from max, and was rather shocked. Don't rule out the odd fluke
path.

If you ever hear a YL reading a set of word pairs each followed by
a ID nubmber in cut morse, that is my odd little station.

I normally keep the power -63dB down from max legal, and only boast
it while actually conducting tests.

Terry in central KY

Give me the exact frequency Terry.

Dale W4OP