Receiver GPS Antenna siting
On 9/27/2012 4:20 PM, Bob Camp wrote:
Hi
At least in my back yard, a 6' tall tripod would be very noticeable from a
number of directions. There are many others in similar situations. If I were
to interpret the restrictions literally as written, an antenna that was
inside
...@febo.com] On
Behalf Of Randy D. Hunt
Sent: Thursday, September 27, 2012 10:24 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] BPSK Receiver GPS Antenna siting
On 9/27/2012 4:20 PM, Bob Camp wrote:
Hi
At least in my back yard, a 6' tall tripod would be very
time and frequency measurement
Subject: Re: [time-nuts] BPSK Receiver GPS Antenna siting
On 9/27/2012 4:20 PM, Bob Camp wrote:
Hi
At least in my back yard, a 6' tall tripod would be very noticeable from
a
number of directions. There are many others in similar situations. If I
were
Of Bill Dailey
Sent: Friday, September 28, 2012 10:32 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] BPSK Receiver GPS Antenna siting
I don't think it is legal to prohibit flag poles
Sent from my iPhone and Hunter Lambert is my hero!
On Sep 28, 2012, at 8:16 AM
Various comments -
Hal mentioned SNR for the scheme I suggested. A PLL can be a coherent
demodulator of arbitrary
bandwidth. Thus the PLL at the output of the doubler can have a small
bandwidth since at that point
there is no PSK, it having been removed by the doubler. So given a
stable VCXO
Hi
At least in my back yard, a 6' tall tripod would be very noticeable from a
number of directions. There are many others in similar situations. If I were to
interpret the restrictions literally as written, an antenna that was inside the
house, but visible through an open window is also a
Hi
A PLL locks to phase. If the phase switches by 180 degrees, the phase tracking
switches signs. There's no way to track that. You either need to double the
frequency (and thus eliminate the modulation) or demodulate the signal and lock
to the result. If you simply put up a real narrow filter
You cannot put a narrow filter before the squarer for reasons previously
cited. In a low S/N area, squaring just makes matters worse wrt dynamic
range and clipping.
-John
==
Hi
A PLL locks to phase. If the phase switches by 180 degrees, the phase
tracking switches signs. There's
On 9/27/12 4:34 PM, Bob Camp wrote:
Hi
A PLL locks to phase. If the phase switches by 180 degrees, the phase tracking
switches signs. There's no way to track that. You either need to double the
frequency (and thus eliminate the modulation) or demodulate the signal and lock
to the result. If
Until I move into the house I'm getting I'm in a rental condo where absolutely
no antennas are permitted. It's a building and I'm on the 4th floor so have
done things like ran a very thin wire out one window to a far one, a wire with a
weight nearly to the ground, a rather long wire (#26
Hi
Ok, to *try* to bring this back together.
There is indeed a valid Time Nuts need for something other than GPS. In reality
there are many reasons. One that has not been mentioned is to check on the
validity of your long term GPS time estimate Small errors that accumulate can
be a really
Bob,
Thanks for the nice, concise, summary of the screwing the new WWVB format
will inflict on the timing community, especially because LORAN-C is dead.
The only benefit to the NIST/XW scheme I can see is creating a monopoly
for Xtendwave in precision TOD marketplace for those not relying on
On 9/27/2012 4:20 PM, Bob Camp wrote:
Hi
At least in my back yard, a 6' tall tripod would be very noticeable from a
number of directions. There are many others in similar situations. If I were to
interpret the restrictions literally as written, an antenna that was inside the
house, but
Flagpoles need caps, right? A GPS antenna would be just perfect. And a
fiberglass flagpole could hide a significant HF vertical!
On 9/27/2012 10:24 PM, Randy D. Hunt wrote:
Put up a flagpole.
Randy, KI6WAS
___
On 9/27/2012 7:27 PM, Peter Gottlieb wrote:
Flagpoles need caps, right? A GPS antenna would be just perfect. And
a fiberglass flagpole could hide a significant HF vertical!
On 9/27/2012 10:24 PM, Randy D. Hunt wrote:
Put up a flagpole.
Randy, KI6WAS
Except, in many places, flagpoles are not permitted.
-John
==
Flagpoles need caps, right? A GPS antenna would be just perfect. And a
fiberglass flagpole could hide a significant HF vertical!
On 9/27/2012 10:24 PM, Randy D. Hunt wrote:
Put up a flagpole.
Randy, KI6WAS
I have been thinking about this problem on and off over the last
couple of days.
Would it be better to take the absolute value rather than squaring the
signal?
I might try some tricky but impractical analog sampling and/or
synchronous demodulation recovery method but the Costas loop looks
The required height to get a usable view of the sky sometimes is just not
practical.
In reading XW's stuff, it looks to me like they are essentially and
intentionally repurposing WWVB from a standard of time interval, to a
distribution vehicle for TOD.
YMMV,
-John
Haha,
On 09/28/2012 01:34 AM, Bob Camp wrote:
Hi
A PLL locks to phase. If the phase switches by 180 degrees, the phase tracking
switches signs. There's no way to track that. You either need to double the
frequency (and thus eliminate the modulation) or demodulate the signal and lock
to the result.
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