[Elecraft] KPA500 troubles

[Wes (N7WS)]

*§ 97.313 Transmitter power standards*.

"(i) No station may transmit with an effective radiated power (ERP) exceeding 
100 W PEP on the 60 m
band. For the purpose of computing ERP, the transmitter PEP will be multiplied 
by the antenna gain
relative to a half-wave dipole antenna. A half-wave dipole antenna will be 
presumed to have a gain
of 1 (0 dBd). Licensees using other antennas must maintain in their station 
records either the antenna
manufacturer’s data on the antenna gain or calculations of the antenna gain."

If I use an inductively-loaded vertical monopole with a minimal ground screen 
over Arizona ground my "dBd gain" might well be several dB negative. In which 
case, I'm allowed to compensate for that, and line loss, in determining 
amplifier output power.  In that, and many other events, a 100W transceiver is 
inadequate, ergo, a KPA500 is not out of the question.

Wes, N7WS

On 11/11/2015 1:32 PM, Jim Brown wrote:
> On Wed,11/11/2015 12:10 PM, W4GRJ wrote:
>> Got the KPA500 back from Elecraft.
>> Problem found: L22 and other components in the 60M low pass filter circuit
>> burnt through the LPF PCB.
>
> 60M LPF??? Last I looked, the US power limit on 60M is 100W relative to a half 
> wave dipole.
>
>

"(i) No station may transmit with an effective radiated power (ERP) exceeding 
100 W PEP on the 60 m
band. For the purpose of computing ERP, the transmitter PEP will be multiplied 
by the antenna gain
relative to a half-wave dipole antenna. A half-wave dipole antenna will be 
presumed to have a gain
of 1 (0 dBd). Licensees using other antennas must maintain in their station 
records either the antenna
manufacturer’s data on the antenna gain or calculations of the antenna gain."

If I use an inductively-loaded vertical monopole with a minimal ground screen 
over Arizona ground my "dBd gain" might well be several dB negative.  In which 
case, I'm allowed to compensate for that, and line loss, in determining 
amplifier output power.  In that, and many other events, a 100W transceiver is 
inadequate, ergo, a KPA500 is not out of the question.