Can work, can go wrong.
One should be careful and think it though.
Cheers,
Magnus
On 11/17/2017 09:25 PM, Jerry Hancock wrote:
I figured, what the heck, and just used a BNC T and it’s working.
On Nov 17, 2017, at 12:20 PM, Magnus Danielson <[email protected]> wrote:
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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