[aprssig] PHG calculators

Dave Baxter Dave at emv.co.uk
Tue Jan 13 07:39:51 EST 2009

Sounds like I touched a nerve with PHG.   No wonder then why many people
do not use it.

Dave, G0WBX.

> -----Original Message-----
> From: Jack Spitznagel [mailto:frawg at frawg.org] 
> Sent: 12 January 2009 21:36
> To: TAPR APRS Mailing List
> Subject: Re: [aprssig] PHG calculators
> 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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