On 2020-06-22 11:03 PM, James Knott wrote:
On 2020-06-22 05:30 PM, Bruce Ferrell wrote:
ERP tends to be used for commercial services, which takes antenna gain and feedline loss into consideration. With amateur radio, at least in North America, it's either DC input power or peak envelope power, depending on the signal type.
James,
Do you hold an amateur license? I do and have off and on since high school. I also used to hold a commercial radio license as well (long ago expired).
Yes, I've had my licence for almost 50 years.
The law specifies the limits as ERP for commercial as well and amateur emissions for exactly the reasons you enumerated... The combinations of antenna gain, line loss etc, to prevent quasi-lawyers form cranking the combination to emit beyond the lawful levels and then pointing the particular parameter that is in spec and claiming to be legal.
It's also why amateurs are held fully accountable for violations that exceed ERP.
In that link I provided, it listed power levels:
10.2 Amateur Radio Operator Certificate with Advanced Qualification
The holder of an Amateur Radio Operator Certificate with Advanced Qualification is limited to a maximum transmitting power of:
* (a) where expressed as direct-current input power, 1,000 W to the anode or collector circuit of the transmitter stage that supplies radio frequency energy to the antenna; or * (b) where expressed as radio frequency output power measured across an impedance-matched load, o (i) 2,250 W peak envelope power for transmitters that produce any type of single sideband emission, or o (ii) 750 W carrier power for transmitters that produce any other type of emission.
I have the advanced licence.
So, it's strictly transmitter power that's considered, not antenna gain, feed line loss, etc..
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