View Single Post
  #9   Report Post  
posted to
Calif Bill
Posts: n/a
Default Keep VHF Radio Antenna At Least 1 Meter Away From Our Heads?

"Shortwave Sportfishing" wrote in message
On Mon, 23 Jan 2006 12:40:09 -0500, Sailaway

It's like the warnings on bread toasters and TVs that tell you not to
the item while showering.

wrote in message

Shortwave Sportfishing wrote:

On 19 Jan 2006 18:18:36 -0800, "

I have just received a ICOM fix-mounted VHF radio. To my

surprise, its
instruction says that I must keep the bottom of the radio antenna
least 1-meter (3.3 feet) away from our heads if the antenna is

in a small boat. I have never heard this before. Is this for


Does this have something to do with strong radio frequency may

boil our
brain or cause cancer?

not cancer - the brain boil thing. turns it to mush at 25 watts.
why i wander around with this blank look on my face.

Does this restriction also apply to 3dB antenna?

all antennas - including car radio antennas, portable radio
antennas -
anything that has an antenna.

Does this mean that I need to use an extension to keep the
radio antenna further away from our heads?

at least three feet - further away is better. its best to put the
antenna on a mast at least three feet tall - ten feet tall is the

Thanks in advance for any info about this "unexpected"

there is no direct evidence that radio waves cause cancer or boil
brain. there is anecdotal evidence, but it has to be very high
- like in the megawatts - at the marine radio frequency.

put your antenna where its easy for you to raise and lower and dont
worry about that stupid - rule - its legal beagles being legal and

Thanks for clarifying this issue to me. Sound like this is not a
"real" issue for a VHF radio that only uses up to 25 watt.

Jay Chan

I spent 17 years as a military electronics tech working on
communications and nav equipment, with much experience in VHF. During
that time, I was required to submit to various regular periodic medical
tests and exams including extensive eye exams due to my exposure to RF
radiation. And I only worked with low-power radios and terminated all
power output into loads when transmitting on the bench - I never had an
antenna next to my head. There is an enormous body of research as well
as plenty of anecdotal evidence of specific damage to body and brain
tissue from various frequencies. Anyone who tells you that RF radiation
- any RF radiation in close proximity, isn't harmful is uninformed. That
doesn't mean you are going to get cancer or fry your brain from your
vhf, but a little caution certainly doesn't hurt. BTW, the most rapid
deterioration in my eyesight was during the period I worked more with
comm radio transmitters.

prove it.

ive been a ham for 48 years with a career in radar and vhf engineering
- ive had more antennas next to my head than youve ever seen.

again, prove it.

My last job was designing RF cookers for the human body. So you can harm
the flesh with RF. We used contact electrodes to get the energy in to the
body. Used RF as the body's nervous system does not know it is getting
electrocuted via RF.