about 60m erp

[Roy Koeppe]

“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.”

Let’s see,

“antenna tuner” loss + coax loss = -1 dB

vertical ant “pattern loss” vs. dipole gain = –2 dB (antenna shorter than quarter wave)

“ground loss” under vertical ant (typical) = –2 dB

total, –5 dB, or around 250 watts or so from an amp for 100 w erp?

73,   Roy   K6XK







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[Roger D Johnson]

According to EZNEC, a 1/2 wave dipole up 1/2 wavelength has a gain of 7.76 dbi
at 27 degrees elevation. Most of this is due to ground reflection. My vertical has a
gain of 0.72 dbi. So I can run 7db more power (500 watts)!!!

73 Roger

On 11/12/2015 7:30 AM, Roy Koeppe 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.”
>
> Let’s see,
>
> “antenna tuner” loss + coax loss = -1 dB
>
> vertical ant “pattern loss” vs. dipole gain = –2 dB (antenna shorter than quarter wave)
>
> “ground loss” under vertical ant (typical) = –2 dB
>
> total, –5 dB, or around 250 watts or so from an amp for 100 w erp?
>
> 73,   Roy   K6XK
>
>
>
>
>
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

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