[amsat-bb] Re: what is QRP

Nigel Gunn G8IFF/W8IFF nigel at ngunn.net
Thu Dec 18 09:04:10 PST 2008

QRP is not generally based on ERP.
It's usually taken to be 10W PEP SSB or 5W carrier power max for other modes.

I think QRP on sats used to be considered to be less than 10W ERP.
It's not difficult to estimate feeder loss and antenna gain.

Jim Danehy wrote:
> QRP is a measure of the transmitter output . . . on a practical basis how would an operator accurately measure the ERP  if you were using ERP (effective radiated power) as a QRP benchmark . . .  you would need instrumentation to measure the feedline losses and sophisticated instrumentation to measure the gain of an antenna . . . most of that type of instrumentation is beyond the average amateur radio operator . . . . but most do have access or use of a watt meter . . . . thus the simple way of calculating QRP . . . ERP is used primarily in satellite operations  because it affects the transponders (not FM repeaters) 
> I have had several private emails in response to my comments about QRP . . . I have seen folks operate the CQ WW  CW contest in the QRP category with stacked beams or monoband beams . . . . I have never seen a definition of QRP that went into ERP . . . . they just use the transmitter output with all of the ambiguities that brings  . . .  have fun 
> Jim W9VNE
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Nigel A. Gunn. G8IFF   W8IFF (have also held KC8NHF, M0NHF, 9H3GN)
1865 El Camino Drive, Xenia, OH 45385-1115, USA   937 825 5032
e-mail nigel at ngunn.net             www  http://www.ngunn.net
Member of  ARRL, GQRP #11396, QRPARCI #11644, SOC #548,  Flying Pig #385,
	Dayton ARA #2128,  AMSAT-NA   LM-1691,  AMSAT-UK, MKARS,  ALC

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