LF: Re: declared power on WSPR

["James Moritz" <james.moritz@btopenworld.com>]

Dear Dimitris, LF Group,


You wrote:
> I was browsing the WSPR database for MF and noticed that I am the only
> one declaring a 50 W power. My TX power output is 50 W, however the
> radiate power is just a tiny fraction of 1 W. What is the protocol for
> WSPR? Advertise the Pout or the EIRP?
I think most people (myself included) make an estimate of ERP/EIRP and 
declare that, rather than TX power. After all, it is only the radiated power 
that counts as far as the receiving stations are concerned, and with huge 
differences between efficiencies of different stations' LF/MF antennas, the 
transmitter output by itself does not tell you much about what is being 
radiated. But the norm for HF WSPR seems to be to quote TX output power - 
probably reasonably similar to the radiated power on those bands, at least 
when simple antennas are used.
Cheers, Jim Moritz
73 de M0BMU