[Elecraft] Excessive SWR Faulting KPA500

[Bert]

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, donovanf at starpower.net 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" <a.durbin at msn.com>
> To: elecraft at mailman.qth.net
> 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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