Skipp,
Several responders have correctly referred to the "noise floor", but I
believe that
none have said what level that is. And it's not trivial to say so, either,
because it
is dependent on the extent to which the antenna under test sees the sky and
ignores blackbody radiation from the
The first generation GPS were, IIRC, 50 Watts, +17dBW EIRP. The latest
one are higher power at up to 200W, or 23dBW EIRP
If you go through the link budget calculations, and assume a receiver with
a good noise figure, you can show that with a ground station antenna of
more than about 36dBi gain
Am 20.08.21 um 22:14 schrieb skipp isaham via time-nuts:
Hello to the Group,
I picked a box of used (removed from commercial radio APRS type
service) mobile/vehicle GPS Antennas. They are mostly the classic
square molded, black plastic magnetic mount type, about the size of a
bar of soap
Hi
The GPS signals are spread spectrum transmissions. If you look for them with
a normal spectrum analyzer they are 10’s of db’s below the noise floor. Yes,
that’s a bit weird, but it does work.
Your gizmos may or may not include a preamp. First thing I’d do is take a look
at current into the
Hello to the Group,
I picked a box of used (removed from commercial radio APRS type service)
mobile/vehicle GPS Antennas. They are mostly the classic square molded,
black plastic magnetic mount type, about the size of a bar of soap when
cut to square (2/3 the size of a large bar of soap).
The chip will still work. Its just a AM receiver and you get the AM
timecode bits out. It has no value as some sort of reference without
removing the BPSK signal that NIST put on. Lots of posts on that stuff back
in 2012-2015.
Good luck.
Paul
WB8TSL
On Thu, Aug 19, 2021 at 9:09 PM Robert
Hi
OCXO59 package. Likely the 11th OEM version in that package done in 2002. Specs
could
be just about anything. Like pretty much all oscillator companies, they would
build to the
OEM’s custom spec. A few OEM’s want their name on the part ( Trimble, Efratom
and
Symmetericom come to mind )
Internet Archive to the rescue!
https://web.archive.org/web/19990506093727/http://www.isotemp.com/ocxo59.htm
According to that page, the OCXO59 series is available in 5 MHz to 50
MHz... So a 1MHz version may have been an OEM version.
>From a later archive of their site, here's a PDF datasheet
