Or, now that I think about it, it's similar to what we do when
measuring ADEV.. you can do a crude how many zero crossings in the
time window or you can do a fit a sinusoid to a series of ADC
samples. One has an uncertainty of one count/epoch, the other
can be substantially better.
How
David McClain wrote:
Or, now that I think about it, it's similar to what we do when
measuring ADEV.. you can do a crude how many zero crossings in the
time window or you can do a fit a sinusoid to a series of ADC
samples. One has an uncertainty of one count/epoch, the other can
be
No, it isn't restricted to an integral number of periods, but you
will have a higher variance in your fits unless there are, due to
variations of the fit with respect to initial phase.
I don't want to send this thread in the wrong direction... but we
have to agree on apples vs apples
Hi:
Another idea to check the WWVB loop-stick was to connect it to the HP
4395A in Spectrum Analyzer mode. But the notation Ext Ref did not
appear, i.e. the external 10 MHz reference signal is not there. It
should be coming from the Thunderbolt.
The Thunderbolt (although running all the
OK, I just got one of these as part of a lot of other test gear.
What is it for? I found nothing searching the archive, and Google didn't help
much either. The Agilent site disclaimed all knowledge!
I suspect it MIGHT be an off air frequency standard as it has 1MHz and 100kHz
outputs and an
Hi:
Can you confirm the model number and provide a photo?
Have Fun,
Brooke Clarke
http://www.PRC68.com
David C. Partridge wrote:
OK, I just got one of these as part of a lot of other test gear.
What is it for? I found nothing searching the archive, and Google didn't help
much either.
I think that's what Jim is saying. If you try to fit to the signal using only
the zero crossing, it will be hard unless you have a lot of zero crossing,
because you will have only one point per period to fit to. If you fit 10 or 100
points per period, you improve your fitting considerably. That
Standard Frequency Receiver. There was a 5090 and 5091. This guy lists the
manual (and he is in the UK):
http://www.divdev.fsnet.co.uk/manmisc.htm
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Make that: http://www.divdev.fsnet.co.uk/man.htm
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In a message dated 14/10/2010 20:46:15 GMT Daylight Time,
david.partri...@perdrix.co.uk writes:
OK, I just got one of these as part of a lot of other test gear.
What is it for? I found nothing searching the archive, and Google didn't
help much either. The Agilent site disclaimed all
The info I’ve included below appears to be from 1969 and sounds like it
was the scheme to broadcast standard frequency on the TV channels, or
to synchronize the broadcasting stations. I have removed the number
references scattered in the text because they refer to a drawing that isn’t
In a message dated 14/10/2010 22:47:20 GMT Daylight Time,
golgarfrinc...@yahoo.com writes:
Some commercially available receivers which are suitable for this purpose
are the type OFS1 manufactured by Advance Electronics Ltd., the types 5090B
and 5091A manufactured by Hewlett-Packard Ltd.
Hello,
I just realized that there will be a nice time coming: MJD=5.5,
which happen to fall on Chrismas Day 25-Dec-2010 at 13:19:59.52 UTC.
I would dare to say that it must carry any theological significance...
Jean-Louis Oneto
___
The HP5090A is a Droitwich receiver to get the 200kHz standard
frequency transmission from Droitwich UK.
Some buffoon of a bureaucrat moved the transmitter to the much more
useful frequency of 198kHz, where it is today.
I have one of these receivers and somewhere some circuit manual
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