Date: Tue, 2 May 2000 14:25:10 -0400
From: "'Geri' Kinzel, DK8KW" <DK8KW@compuserve.com>
Subject: LF: GPS Signals Accurate Now!!!
To: rsgb_lf_group@blacksheep.org
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Hello,

for those of you using GPS receivers to measure distances for example for
field strehgth measurements (Gamal and I used a Garmin GPS45XL for our
field strength profile of DCF39 and I used this unit to measure the profile
of my own transmitter), here is some great news from the AMRAD e-mail
reflector:

> In the next few days, we should be getting an announcement that the
> selective availability system will be either turned off or reduced in
> some fashion.  See  http://www.igeb.gov/
> Cliff K7RR

Indeed, it happened midnight last night! SA is off, and recording of my GPS
signal with a stationary antenna shows that all fixes are within a circle
of 15m radius (95% even within 10m radius!). Altitude error is also reduced
down to 1.5 times the horizontal error, so you can climb up your tower and
measure the height of it using GPS!

Also time measurment accuracy using GPS should have increased according to
what I read on the internet (great news for those experimenting with
synchronized signals on LF!).

So, what do they do with all those longwave DGPS stations? More sites and
tower to be activated before they are de-commissioned (and what do they do
with the evacuated frequencies after de-commissioning ... )!


Best 73

Geri, DK8KW (W1KW) 
http://www.qru.de