Hi,
The reason I mention sharing antenna is that it takes out the difference
that is natural from having different antennas and the difference in
multipath.
Sharing antenna has its own set of problems, so a suitable antenna
splitter was assumed. Effectively you need to bypass DC to power the
antenna, you need to amplify the signal to compensate for the loss due
to the splitter, and it needs to look like an antenna to the GPS
receiver, so the antenna alarm does not goes off.
Cheers,
Magnus
On 11/17/2017 09:01 PM, Jerry Hancock wrote:
Thanks, understand completely.
You mention “sharing an antenna”. Is there a problem with connecting the same
antenna to two units? I am referring to my REF0/REF1 pair.
Thanks
On Nov 17, 2017, at 11:39 AM, Magnus Danielson <[email protected]>
wrote:
Hi,
First of all, the receiver varies around some average phase.
The average of two receivers may not be the same, even if sharing antenna.
Their average can be offset from "absolute phase" because of offsets in the
receiver, antenna cables and antenna.
If you are not to careful, a GPSDO will do nicely for many applications. The
more you care, the more hassle.
Oh, and two GPSDOs next to each other can have significant common mode
disturbance, so you can't really evaluate a GPSDO by measuring up to another
GPSDO.
Cheers,
Magnus
On 11/17/2017 08:05 PM, Jerry Hancock wrote:
Granted I expect someone on this list to reply with something that makes me
feel stupid, if you have two GPSDO units running side by side, should the phase
delta on the 10Mhz output be zero (ideally)? Is there an absolute phase
standard kept between GPSDO units as all it would take is one extra inverter in
the chain to flip the phase, no?
Thanks
Jerry
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