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In some programs, like UI-View, just copy and
paste the result at the beginning of your beacon comment field under station setup.
If you are using this code with a standalone TNC Digipeater, a properly formated
LT buffer line will incorporate the PHG code as this example will show: "LT 2
!2749.45NS08215.60W_PHG74606/W3,FLn Riverview, FL".
Shown below is an example of how
AGWTracker decodes the PHG code based on
the questions asked above and draws a coverage circle around our
KG4YZY-10/-11 APRS Digi &
I-Gate site in Port Richey, FL. It is relatively accurate, given that at 200ft
above ground level, it plots about 15-20 miles radius coverage (approximately
4/3's earth with the offset antenna) for the site. At the same time,
we can see overlap with other nodes around ours.
But how accurate is PHG calculations or range based on these simple questions?
Pretty good in most cases. PHG clearly cannot see mountains or other obstructions.
Comparing it to a coverage plot generated by
Radio Mobile, which does take
terrain into account (pretty flat in Florida), these two do match pretty well as
show below.
Since APRS is a packet radio mode that requires a bit more signal to maintain
full quieting, the area in solid light blue is where coverage will carry on this
map mobile, which is about -78.5dBm RSSI.
You'll note that the area in question matches up pretty close to the coverage map
displayed above from AGW Tracker from the PHG code.
We hope these examples show the importance of PHG, and how useful the information can be.
Still have more questions about PHG or digipeater setup in the New Paradigm?
Just contact us, we're always happy to
help.
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