John Miles wrote:
That NIST box looks very nice but I have no idea what it does. If it's just
a quadrature PLL and collection of filters, that can be done for a lot less
than $4000. If it's got features like an ensemble of built-in reference
oscillators, then $4000 could be a bargain.
--
On Mon, 17 Aug 2009 23:18:58 +1200, you wrote:
1) Use 3 sources, S1, S2 and X.
2) Phase lock S1 in quadrature to X using a diode double balanced mixer
using a low bandwidth PLL.
3) Phase lock S2 in quadrature to X using a diode double balanced mixer
using a low bandwidth PLL.
Then for
Gerhard Hoffmann wrote:
On Mon, 17 Aug 2009 23:18:58 +1200, you wrote:
1) Use 3 sources, S1, S2 and X.
2) Phase lock S1 in quadrature to X using a diode double balanced mixer
using a low bandwidth PLL.
3) Phase lock S2 in quadrature to X using a diode double balanced mixer
using a
I bought a couple of pizza pans for the GPS Patch Antenna Improvement
Program... preliminary results:
My 15+ year old Magellan patch antenna (actually made by Murata) would barely
function with the Tbolt. It was (barely) tracking three satellites and going
through long periods of
Mark,
I'll take salami, onion and mozzarella...
Mark Sims wrote:
I bought a couple of pizza pans for the GPS Patch Antenna Improvement
Program... preliminary results:
My 15+ year old Magellan patch antenna (actually made by Murata) would barely
function with the Tbolt. It was (barely)
Hi all: for the proper dimensions, see some of the sections of W1GHZ's
microwave antenna handbook to get the appropriate size for the pizza pan
choke. Mark may have gotten lucky...
Don
Magnus Danielson
Mark,
I'll take salami, onion and mozzarella...
Mark Sims wrote:
I bought a couple of
Hi Joe,
I think it is quite limited in the actual phase noise floor you can achieve
at carriers 1GHz. A good OCXO will far out-perform this utility due to
the noise-floor limits of the 8560 series.
To give you an idea, you get about ~90dBc/Hz up to 100Hz offset or so, then
120 - 130dBc
Hello,
I am trying to achieve accuracy with two frequency standards disciplined to
GPS.
I am trying to get their 1 pps outputs close to each other as possible.
The idea being you put each unit in a different part of the world and the 1
pps outputs are sycronised.
So far I have two units
I sent this thread to a friend, and he replied:
===
I bought a couple of pizza pans for the GPS Patch Antenna Improvement
Program... preliminary results:
My 15+ year old Magellan patch antenna (actually made by Murata)
would barely function with the Tbolt. It was (barely) tracking
It probably isn't a matter of luck. Automotive style antennas were
designed to be attached to the roof of the car, which is a ground
plane. The pizza pan probably does a good job of simulating a car
roof.
It is my understanding that the choke rings aren't there to improve
the gain, but rather
Yes, I also assumed that having the lip of the pan facing up would not be
good. I mounted the antenna on the bottom of the pan. In the center of the
top of the pan (the side where the pizza would be) I glued a 5/8-11 nut. This
is the standard size used on most surveying instruments,
Mark Sims wrote:
Yes, I also assumed that having the lip of the pan facing up would
not be good. I mounted the antenna on the bottom of the pan. In the
center of the top of the pan (the side where the pizza would be) I
glued a 5/8-11 nut. This is the standard size used on most surveying
Magnus Danielson wrote:
Should learn to use nut for simulation.
Cheers,
Magnus
I don't understand. Is nut a program?
-Rex
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Rex wrote:
Magnus Danielson wrote:
Should learn to use nut for simulation.
Cheers,
Magnus
I don't understand. Is nut a program?
Ehmm... I meant to say nec, as in nec2... which is a simulation program.
Cheers,
Magnus
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Hi
Depending on your antenna location(s) and GPS receivers, that's in the
good to very good range.
Bob
On Aug 18, 2009, at 3:29 PM, Martyn Smith wrote:
Hello,
I am trying to achieve accuracy with two frequency standards
disciplined to GPS.
I am trying to get their 1 pps outputs
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