Hi
Another tidbit …..
The antennas are each actively tuned (they are *very* narrow band). As the wind
blows,
you can watch them adjust to the change in “shape”. Very cool …..
Bob
> On Aug 21, 2021, at 4:41 PM, Poul-Henning Kamp wrote:
>
>
> Robert DiRosario writes:
>
>> I really
Robert DiRosario writes:
> I really wish NIST didn't add the BPSK modulation to WWVB. Increasing
> the transmitter power would have been a lot better, but I'm sure that
> would have cost a lot more then just changing the modulation.
One does not simply increase the transmitter power
I remember in the early 90's I used a HP receiver and a Tracor M 100 with no
problem in Miami. Junghans came to Miami to test their clocks and watches using
a R handheld device for accurate signal evaluation. They had determined that
Miami was the most distance from the 60 KHz transmitter in
Hi
I’d bet that OCXO was made in the 48th week of 1990.
Bob
> On Aug 21, 2021, at 3:14 PM, Robert DiRosario wrote:
>
> I found that very late the other night. I don't think that's it because the
> physical construction is different. I've attached some photos. I think this
> Time Code
Hi
If the TBolt is locked up and has stayed locked up for 24 hours
it should be pretty accurate. Ideally you would like to be locked
to at least 4 sats at all times for best accuracy. Lady Heather is
your friend when it comes to checking this sort of thing.
How good is “pretty accurate”? At 8
Hi
The WWVB transmitters are military surplus. I suspect they got them at a very
low cost to NIST. The proposal they kept floating was to set up a second LF
time signal for the east coast. That way they could do better coverage over
the entire county without going to higher power. My guess is the
Hello Time-Nutters--
I am working on building a downlinking AZ/EL tracking dish set up to
receive the 8.2 GHz telemetry from the Suomi JPSS polar orbit
meteorological/environmental satellite. The receiver seems to be
working OK but it periodically appears to slowly drift frequency by
300 Hz to
This will just be a backup clock in my amateur radio station. I already
have a Truetime XL-DC and a XL-AK, both have GPS receivers that give
IRIG-B and 1PPS outputs, and drive a couple of IRIG-B clocks. I would
guess the GPS time signal will be more accurate and precise then WWVB,
and both
I used to test cheap GPS antennas with the network analyzer, using a
bias-tee to feed 5V power to the antenna and to avoid damaging the VNA
RF input (even if the RF input is 50V tolerant).
On Sat, Aug 21, 2021 at 6:14 PM Dana Whitlow wrote:
>
> I love Dan's idea, with one caveat. The
BTW, Skipp, there is a slim chance that a non-amplified antenna is a DC short,
so wise to check that before you try to power
it up from a PS or a receiver..
Tom Holmes, N8ZM
-Original Message-
From: Dana Whitlow
Sent: Saturday, August 21, 2021 12:13 PM
To: Discussion of precise time
I love Dan's idea, with one caveat. The transmission through a
powered-down LNA
is an unknown, probably even to the manufacturer. Thus comparing output
signal
levels with power on or off is pretty meaningless.
But his test with power on should be a great way to get some clue that the
antenna
is
> Should I be able to "see something" on or around the GPS frequency other
> than what I suspect will be something visual looking like a noise/pulse
> source/signal?
You could try sweeping a harmonic from a signal generator across the antenna
passband, this would be visible on the spectrum
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