[aprssig] PHG calculation formula?
Dave Baxter
dave at emv.co.uk
Thu Oct 26 04:17:04 CDT 2006
OK, so what exactly do you do with...
power = pow(base_power, 2.00)
Comma 2.00? Is there a function designator missing somewhere, as that
looks like you're calling a function "pow" with two indipendant values,
"base_power" and the value of 2.
And for that matter...
haat = (10 * pow(2.00, base_haat))
10 times the result of calling pow(x, y) again?
Dave G0WBX.
Bob's .mil and .edu sites are unavailable again, or it's the continuing
DNS colic they seem to suffer from..
________________________________
From: Gregory A. Carter [mailto:aprssig at gcarter.infodns.com]
Sent: Wednesday, October 25, 2006 12:34 AM
To: aprssig at lists.tapr.org
Subject: [aprssig] PHG calculation formula?
Here's the snippet that calcs it from OpenAPRS's daemon...
power = pow(base_power, 2.00);
haat = (10 * pow(2.00, base_haat));
gain = pow(10.00, (base_gain / 10));
range = sqrt((2 * haat * sqrt((power / 10) * (gain / 2))));
73
Greg
N7NXS
On 10/24/06, Alan P. Biddle < APBIDDLE at mailaps.org
<mailto:APBIDDLE at mailaps.org> > wrote:
I was looking for the formula which is used for the PHG
values for the
beacon. No problem finding a site which would calculate
it, but I flunked
Google 101 on the formula itself.
TNX
Alan
WA4SCA
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