Excessive RF Exposure from Long Wire?
 

Hello friends,

I am thinking about pushing my FT-57GX into service from my third
floor apartment in the city. I have a good tuner, so one simple
approach might be to connect a wire from the tuner and run the wire
outside. Since I am not physically near the ground, I can run a wire
to the cold water pipe and use my MFJ Artifical Ground to tune the
reactance out of the ground system.

The one concern I have is that while operating I will be sitting near
the tuner and therefore near the wire antenna and the ground wire, at
the least the portion of them that connects to the tuner. Both the
antenna and ground wire will presumably be carrying sizable RF
currents when I am transmitting. Should I be concerned about RF
exposure from this set-up (running up to 100 watts)?

Thanks,

JJ

The one concern I have is that while operating I will be sitting near
the tuner and therefore near the wire antenna and the ground wire, at
the least the portion of them that connects to the tuner. Both the
antenna and ground wire will presumably be carrying sizable RF
currents when I am transmitting. Should I be concerned about RF
exposure from this set-up (running up to 100 watts)?

Thanks,

JJ



Don't worry about it. Hams and RF engineers at radio stations were and are
exposed to huge by comparison levels of RF and they live long. This RF exposure
crap is in the same category as global warming, vegetarian crap and ozone hole.

Enjoy your radio.

Yuri, K3BU

You will suffer the burning pain of global warming before the 100 Watts will
bother you...

But then again, I could probably get a lawyer to prove your endangering my
life, here in South Carolina, every time you key up.

Mores the pity...


"jj" wrote in message
om...
Hello friends,

I am thinking about pushing my FT-57GX into service from my third
floor apartment in the city. I have a good tuner, so one simple
approach might be to connect a wire from the tuner and run the wire
outside. Since I am not physically near the ground, I can run a wire
to the cold water pipe and use my MFJ Artifical Ground to tune the
reactance out of the ground system.

The one concern I have is that while operating I will be sitting near
the tuner and therefore near the wire antenna and the ground wire, at
the least the portion of them that connects to the tuner. Both the
antenna and ground wire will presumably be carrying sizable RF
currents when I am transmitting. Should I be concerned about RF
exposure from this set-up (running up to 100 watts)?

Thanks,

JJ

"jj" wrote:

Should I be concerned about RF exposure from this
set-up (running up to 100 watts)?
________________

OET Bulletin 65 of the FCC covers radiation hazards and limits for US
transmitting stations, including amateur radio. The bulletin is available
on line as a PDF file at the link below.

http://www.fcc.gov/Bureaus/Engineeri...et65/oet65.pdf

Pages 15-18 describe amateur radio requirements.

RF

OET Bulletin 65 of the FCC covers radiation hazards and limits for US
transmitting stations, including amateur radio. The bulletin is available
on line as a PDF file at the link below.


http://www.fcc.gov/Bureaus/Engineeri.../bulletins/oet
65/oet65.pdf

Pages 15-18 describe amateur radio requirements.

RF

\


Pile of unfounded bullsheet! Biggest crock with ARRL saupport.

When you get to UHF and microwaves, Yes, there is the problem, mainly due to
heating effect.

But up 30 MHz, just ask any of the 90 year old OF hams and broadcast engineers
that lived their lives in the RF fields. Most of them lead active life, free of
cancer (unless they smoked it in).

Yuri

Yuri Blanarovich wrote:
But up 30 MHz, just ask any of the 90 year old OF hams and broadcast engineers
that lived their lives in the RF fields. Most of them lead active life, free of
cancer (unless they smoked it in).

How about all the people who once swore by diathermy treatments
offered by many doctors? Are they still available?
--
73, Cecil http://www.qsl.net/w5dxp



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How about all the people who once swore by diathermy treatments
offered by many doctors? Are they still available?
--
73, Cecil http://www.qsl.net/w5dxp



I dunno. Ask them?
I am using magnetothermia and it helps.

Yuri

I was thinking about a possible solution to this type of problem, and
would like some feedback on it. Since the current in the random wire
should be approximately equal and opposite to the current in the tuned
ground line, why not use a 10 foot(or so) length of coax, balanced
line, or twisted pair for the antenna and ground for the first ten
feet from the tuner, and separate the wires beyond that? Shouldn't
this approach reduce the radiation close to the operator?

- JJ

"Yuri Blanarovich" wrote in message
...

How about all the people who once swore by diathermy treatments
offered by many doctors? Are they still available?
--
73, Cecil http://www.qsl.net/w5dxp



I dunno. Ask them?
I am using magnetothermia and it helps.

Diathermy, or 'Violet Ray', is still used in
beauty schools and dermatologist's offices.
There are some skin diseases that respond
to UV...
__
Steve
..

Stephen Cowell wrote:
Diathermy, or 'Violet Ray', is still used in
beauty schools and dermatologist's offices.
There are some skin diseases that respond
to UV...

If I remember right, diathermy operated around 11m. I remember
hearing them when I was in high school.
--
73, Cecil http://www.qsl.net/w5dxp



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-----== Over 100,000 Newsgroups - 19 Different Servers! =-----

If I remember right, diathermy operated around 11m. I remember
hearing them when I was in high school.
--
73, Cecil http://www.qsl.net/w5dxp


Was there problem or any negative effects from diathermy?

Yuri

Yuri Blanarovich wrote:

If I remember right, diathermy operated around 11m. I remember
hearing them when I was in high school.

Was there problem or any negative effects from diathermy?

Back when I had a particularly nasty sinus infection while I was an
undergraduate, I got my frontal sinuses diathermied to loosen the
guck in the sinuses. Worked a treat, and I haven't noticed any ill
effects -- except the green tentacles at the corners of my mouth.

--
Most people aren't thought about after they're gone. "I wonder where
Bob got the plutonium" is better than most get.
-- Robert Uhl, in rec.org.sca

Yuri Blanarovich wrote:
Was there problem or any negative effects from diathermy?

I know someone who had diathermy and died 50 years later.
--
73, Cecil http://www.qsl.net/w5dxp



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Yuri Blanarovich wrote:
How about all the people who once swore by diathermy treatments
offered by many doctors? Are they still available?
--
73, Cecil http://www.qsl.net/w5dxp




I dunno. Ask them?
I am using magnetothermia and it helps.


Hot magnets??? ;^)

- Mike KB3EIA -

I know someone who had diathermy and died 50 years later.
--
73, Cecil http://www.qsl.net/w5dxp




At age of 95?
Seriously, are there any known ill effects from diathermy?

Yuri

"Yuri Blanarovich" wrote in message
...

I know someone who had diathermy and died 50 years later.
--
73, Cecil http://www.qsl.net/w5dxp




At age of 95?
Seriously, are there any known ill effects from diathermy?

Yuri


The eyes and gonads are two part of the body that most sensitive to
microwave radiation. So unless going blind and sterile is not a problem,
diathermy is not a good idea.



--
John Passaneau W3JXP
State College Pa

This mail is a natural product. The slight variations in spelling and
grammar enhance its individual character and beauty and in no way are to
be considered flaws or defects.

John Passaneau wrote:
The eyes and gonads are two part of the body that most sensitive to
microwave radiation. So unless going blind and sterile is not a problem,
diathermy is not a good idea.

Diathermy in the 50's was HF, not microwave.
--
73, Cecil http://www.qsl.net/w5dxp



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Cecil, W5DXP wrote:
"I know someone who had diathermy and died 50 years later."

50 years ago I had already spent 5 years working in broadcast
transmitter plants and was then working in what was thought to be the
world`s largest combination of high power shortwave transmitters and
antennas.

I had an ear come in contact with a fully modulated 50 KW signal on one
of the transmission lines. It was shouting the Polish language right
into my ear which burned to a crisp. I`m glad it wasn`t carrying one of
our higher powered transmitters at the time.

I`m still alive after all manner of exposure to radiation from low KHz
to GHz for prolonged periods. After the shortwave plant experience, I
became father of 4 healthy children. I don`t take pills, haven`t had a
doctor for decades, and hike 3 miles a day. Radio frequency exposure may
be therapeutic, but beware ultraviolet.

My friend, Norman Olstad, W5OQJ, was a cinema projectionist suffering
from a severe chest cold. He decided to bake it out with the projector`s
carbon arc. He exposed his chest to direct radiation from the arc during
the evening shift at the theater.

Norman pulled the big switch, locked up the cinema, and went home to bed
at the end of his shift. Next morning he was dead in bed. Examiner said
he had been ultraviolated to death.

We may need an ozone layer for protection from ultraviolet.

Best regards, Richard Harrison, KB5WZI

jj,
No ill affects. Pick something else to worry
about.
'Doc

"Cecil Moore" wrote in message
...
John Passaneau wrote:
The eyes and gonads are two part of the body that most sensitive to
microwave radiation. So unless going blind and sterile is not a problem,
diathermy is not a good idea.

Diathermy in the 50's was HF, not microwave.
--
73, Cecil http://www.qsl.net/w5dxp



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-----== Over 100,000 Newsgroups - 19 Different Servers! =-----


That's interesting. The only diathermy machine I've ever seen worked at
about 5GHz. It had a jointed metal arm with interchangeable dish and horn
antennas that were changed to fit the body part you wanted to heat. The arm
was a wave guide to get the power from the generator to the antenna. It
worked quite well for heating the body. I'm not sure how HF range RF would
do at heating the body though. I used to work with a 50KW induction heater
that ran at about 500KHz and it would heat my belt buckle but not me, at
least not directly. Thinking about I do remember seeing a picture of someone
using a diathermy machine with a coil warped around the body, so maybe it
could be done at HF. The eyes and gonads are most sensitive to RF as they
are the organs that are most exposed on the body with the highest water
content. That's why things with little water do not get hot in a microwave
oven. The microwaves are exciting the water monocles, and excited monocles
are hot monocles.


--
John Passaneau, W3JXP
Penn State University

On Fri, 13 Feb 2004 15:49:59 -0500, "John Passaneau"
wrote:
I used to work with a 50KW induction heater
that ran at about 500KHz and it would heat my belt buckle but not me, at
least not directly.

Hi John,

Sitting directly on top of the international maritime distress
frequency?

73's
Richard Clark, KB7QHC

OK on the comments, it was my point that exposure to almost any reasonable
level of RF from antennas is not harmfull. If anything it is beneficial.
Microwaves are different story, yes, eyes and nuts are most sensitive. But the
recent bugaboo from FCC and ARRL about RF exposure levels is nuts and another
scary crap.

Magnetothermia is RF heating with around 27 MHz and statically shielded loop.
It allows to focus the energy into body parts and it was found to heal
fractures by 60%, asthma clogging, cold, painfull joints, cook cancer tumors,
etc.

So enjoy your RF exposure, get daily dose of sunshine and you will live long
and be sharp.

73 Yuri, K3BU

In article ,
Yuri Blanarovich wrote:

OK on the comments, it was my point that exposure to almost any reasonable
level of RF from antennas is not harmfull. If anything it is beneficial.
Microwaves are different story, yes, eyes and nuts are most sensitive. But the
recent bugaboo from FCC and ARRL about RF exposure levels is nuts and another
scary crap.

One thing I might be concerned about, in running a long-wire into the
house, is the possible presence of high RF voltages on the inside end
of the wire. If the wire happens to be near anti-resonance on a
particular band, and it's successfully tuned using an ATU or step-up
transformer, then there could be some very high voltages present.
There might be similar issues with the artificial-ground system or
indoor counterpoise. Running 100 watts of RF into the heating pipes,
household ground wire, etc. seems like maybe not the best of ideas.

RF burns hurt, and can be dangerous. Even a 100-watt barefoot system
packs quite a bit of punch at the high-voltage points on the antenna
system. A system of the sort that the OP plans to use, deserves
careful planning and installation to make sure that the high-voltage
points are safely insulated, and protected against casual and
accidental contact by the operator and by anyone else. Otherwise,
somebody might get "bitten".

As to the FCC regulations re RF exposure, and the ARRL's publicizing
of them, I'd make the following two comments:

[1] Like 'em or not, believe in 'em or not, they have the force of
law. They're part of what we agreed to comply with, when we
applied for our licenses.

[2] From what I've heard, the setup that the OP is considering using is
perhaps more likely to generate RFI/TVI than a system using a
balanced antenna located well clear of the building. Hence, it's
probably more likely to generate complaints from neighbors and
from the landlord, and questions about whether it's safe. It can
probably help to diffuse such complaints (and perhaps avoid a
"shut it down or lose your lease" warning from the landlord) if
you can demonstrate that the calculated RF exposure levels to
everyone concerned are below the FCC's published limits.

--
Dave Platt AE6EO
Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior
I do _not_ wish to receive unsolicited commercial email, and I will
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