I guess I'll have to repeat myself.
There is no requirement to have a "measured" antenna; calculated gain (loss) is
permitted. It's kind of like high school algebra, you just have to show your
work. With modern analysis tools such as Eznec, it is almost trivial to do so,
if you know what you are doing.
Soapbox mode on: When I was first licensed, we were relegated to using the DC
input (Vp x Ip) as our power limit because it was assumed that we did not have
the ability to measure RF power accurately. As technology improved and this was
no longer the case, the power limit(s) was changed to transmitter output power.
Now we have been given a band, where like every other service, we get to use
ERP, since the FCC, giving us the measure of the doubt, assumes that we know how
to determine it.* We should, it's a requirement of *§97.13*:
"(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:"
* Also see
https://www.fcc.gov/Bureaus/Engineering_Technology/Documents/bulletins/oet65/oet65.pdf
where on page 16 it says:
"Many antenna-modeling programs are based on NEC or MININEC analysis. These
programs often yield very accurate results. An amateur enters his or her
antenna dimensions and ground characteristics into the antenna model, and
the program is then executed to calculate electric and magnetic field
strengths near the antenna. These programs do require some amount of user
skill, but the average amateur should not experience too much difficulty in
using them. The ARRL Web page maintains a list of software vendors who sell
antenna modeling software (http://www.arrl.org/news/rfsafety)"
Soapbox mode off.
N7WS
On 11/12/2015 1:05 AM, Guy Olinger K2AV wrote:
Kpa500 on 60 is illegal unless you have a *measured and
documented* VERY lossy antenna that would reduce the effective radiated
power to the same as 100 watts on a dipole. The simple 99 percent answer is
that on 60m SHUT OFF the Kpa500 and run 100 watts barefoot.
73, Guy K2AV
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