Hi guys,
Here in Canada we have something called Safety Code 6, which
states that a field strength level on any HF frequency over 3.16V/m is
unsafe
in an uncontrolled space.
On a small city lot, close to neighbors, the power you're mentioning will
definitely exceed 3.16V/m.
What levels to do you have to comply with in the US?
Bert VE3NR
On 4/18/2020 8:33 PM, [email protected] wrote:
Hi Andy,
A very close 40 meter antenna is much safer than a close 12 or 10 meter antenna
See FCC Amateur Radio Regulations: Part 97.13 Restrictions on station location.
(c) Before causing or allowing an amateur station to transmit from any
place where the operation of the station could cause human exposure to
RF electromagnetic field levels in excess of those allowed under §1.1310
of this chapter, the licensee is required to take certain actions.
(1) The licensee must perform the routine RF environmental evaluation
prescribed by §1.1307(b) of this chapter, if the power of the licensee's
station exceeds the limits given in the following table:
Evaluation required if power in (watts) exceeds:
160m 500 watts
80 m 500 watts
75 m 500 watts
40 m 500 watts
30 m 425 watts
20 m 225 watts
17 m 125 watts
15 m 100 watts
12 m 75 watts
10 m 50 watts
(2) If the routine environmental evaluation indicates that the RF
electromagnetic
fields could exceed the limits contained in §1.1310 of this chapter in
accessible
areas, the licensee must take action to prevent human exposure to such RF
electromagnetic fields. Further information on evaluating compliance with these
limits can be found in the FCC's OET Bulletin Number 65, “Evaluating
Compliance with FCC Guidelines for Human Exposure to Radiofrequency
Electromagnetic Fields.”
73
Frank
W3LPL
----- Original Message -----
From: "Andy Durbin" <[email protected]>
To: [email protected]
Sent: Sunday, April 19, 2020 12:07:13 AM
Subject: [Elecraft] Excessive SWR Faulting KPA500
"At a distance of only six feet to your antenna, perhaps your amplifier is trying to
warn you that you may also have a human RF safety issue. "
Well, do you feel warm....
We do what we must to get a signal out. My 40 m dipole is in the attic of a single story house
under an asphalt and fibreglass radome. Yes I have RF in the "shack" and every other room
in the house. My choice how high I turn the wick though and that choice is less than 500 W. My
"controller" prevents my getting excited and turning the wick up all the way.
Antenna is well matched though and KPA500 is happy. The only problems I've had
with an unhappy KPA500 were on 20 m.
73,
Andy, k3wyc
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