Hi
For a variety of reasons, a puck antenna is a bad choice for a lab timing
receiver.
Because the ground plane (and other issues like feed line) are a variable,
getting a
good pattern is a matter of luck. Multipath ( = low angle) rejection is rarely
going to
work well with them. They also
Yo All!
On Tue, 30 Apr 2019 22:52:26 + (UTC)
Taka Kamiya via time-nuts wrote:
> Yes, I saw your particular mention of survey antennas. My concern
> was that multi-path will affect any setup.
The best explanation I have seen is here, with lots of pretty graphs:
Hi
The pictures shown earlier are of a “survey antenna”. In the post I was careful
to refer to a “survey antenna”
as the point of the post. Ideally you want to be meters away from any metal.
Bob
> On Apr 30, 2019, at 5:42 PM, Taka Kamiya via time-nuts
> wrote:
>
> I can see that on survey
I can see that on survey situation but will it affect timing installations?
Will you give me an idea how far those bullet type antenna needs to be? My
antenna sits on a very short pole (2 feet?) and its base is mounted to frame of
my screened in porch. Roof and structure is aluminum, which is
Hi
You very much do *not* want to put a ground plane on one of the modern survey
antennas.(Chinese or US or Canadian or …) The better ones are very explicit
about this. They are optimized to sit on a pole in free air. Anything else and
the
pattern is degraded. ( = multipath gets worse)
Bob
Hi David,
No, no ground plane. Don’t really have a lot of room for that in the window.
Out of curiosity, how large of an impact have you found with a ground plane?
Btw, I love the pan!
Denny
Yes, Denny, choosing the baking tray (IIRC) was fun - I wanted as large
On Mon, Apr 29, 2019 at 5:00 PM Tim Shoppa wrote:
> My reading is that Amazon does their smear for 24 hours before the leap
> second, and Google does it for 10 hours before and 10 hours after.
The smear Amazon uses is twelve hours before and after, i.e., smeared
noon to noon.
> From: Denny Page
> Initially, the units were connected to puck antennas that are literally side
> by side. At approximately 19:15, the units are taken off the puck antennas
> and connected to the single antenna through the splitter.
> I really didn?t expect such a dramatic change.
It does
Hi David,
No, no ground plane. Don’t really have a lot of room for that in the window.
Out of curiosity, how large of an impact have you found with a ground plane?
Btw, I love the pan!
Denny
> On Apr 30, 2019, at 00:34, David J Taylor via time-nuts
> wrote:
>
> Agreed with Dana's
Also, some receivers do a survey every time you power them up.
---
> If you move the antennas “far enough” (how far very much depends
on the design) the device goes back into survey mode.
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Hi
There normally is a “survey in” process on a GPSDO. The location then gets used
to
help out the timing solution. If you move the antennas “far enough” (how far
very much depends
on the design) the device goes back into survey mode. While doing that, the
timing
may be less than ideal.
Bob
Denny,
That is certainly a large difference. But I'm not clear on one point that
could easily be very important:
Were the two antennas for the separate antenna test indoors, or on the roof?
If indoor, I kind of suspect that the difference might mostly be attributed
to the change in antenna
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