[aprssig] PHG calculators
frawg at frawg.org
Mon Jan 12 15:36:24 CST 2009
Sounds like some folks are asking for something like the six digit
extension PHG's (PHGDRA/ - Power,Height,Gain,Directivity,Rate,Altitude)
that are used by the PropNET Project folks. The altitude of terrain is
supposed to help to differentiate between what the listener stations
receive when comparing the guy in the valley using his tower as a 10 M
vertical and the guy on the mountain top using a retuned CB vertical. It
does not have a front to back value in it either.
So my beacon text on Propnet is "kd4iz>hy:[fm19oo]phg221066/^967D" Using
a QRP radio 40ft vertical with unity gain, omnidirectional pattern, rig
beaconing every 10 minutes, antenna parked in the yard where the ASL
height is 680ft.
Obvious... the rest is my call, band (hy = 10M), my locator FM19oo, and
the ^967D at the end is a checksum that helps us analyze the path
quality by verifying the data was copied accurately.
Reminds me to ask why we don't have a front-to-back ratio value for
beams and arrays... although it may be not that useful for PropNET. Most
folks use verticals which are unity and direction neutral because we are
probing in all directions...
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