I inquired with Leviton as to the accuracy of the VTP24 24 Hour Programmable
Timer with DST.
https://www.leviton.com/en/products/vpt24-1pz
Don Resor
Here is the reply I received:
Hello,
Thank you for contacting Leviton technical support. According to the code it
meets, it is required to have
Stijn,
I have a GR unit marked GR-1101 Piezoelectric Oscillator that consists
of the quartz bar(broken) and the oscillator. If this is what you are
looking for you're welcome to it. Let me know if it can be of use to you.
Bill
On 8/23/2021 9:15 AM, Stijn wrote:
Seems that the pictures got
Just to be clear, the shift has to be in phase, not time per se. A 90 deg
phase
shifter based on a constant delay will not work well at other frequencies.
That's
why phasing-type SSB exciters got so messy in the audio phase
splitter department
(in the old days).
Nowadays with digital processing,
I think Dana's explanation is a much clearer way to think of what is going
on in an I-Q receiver.
Until you are really far down the signal chain, at the demodulator, where
you might process the I and Q signals differently,
there is no 'splitting' or division of the signal into I and Q.
The signal
Hi Jim,
I think the best way is to view the signal as a phasor, with any
noise present adding a
random trajectory (a fuzzball) to the tip of the signal vector.
Conceptually speaking,
this eliminates needing to worry about the distribution of power between I
& Q, etc.
It lets you view the whole
Lux, Jim writes:
>I'm looking for a simplified treatment of the uncertainty of I/Q
>measurements. Say you've got some input signal with a given SNR and you
>run it into a I/Q demodulator - you get a series of I and Q measurements
>(which might, later, be turned into mag and phase).
>
Now, re-reading my response and thinking a little longer, I understand your
question a little better, maybe. I see where you
are coming from if RF and LO are the same frequency, and it's not totally clear
to me yet what happens as the phase changes.
My quick back of the napkin (yes, I actually
Hi
Once you get things down to baseband, you (likely) shove the I and Q into some
sort of arc tangent math. Depending on just how you do that math, there can be
some bumps in the road. It’s implementation dependent so I don’t know of a
“generic” answer. I’m not all knowing so there may be one
HI Jim...
>From my admittedly limited understanding of IQ demodulators, the first thing
>done is to split the signal power (signal, noise, and all) evenly between two
>paths, which then ideally feed identical double balanced mixers (I'm thinking
>of a hardware implementation, obviously) whose
This is sort of tangential to measuring time, really more about
measuring phase.
I'm looking for a simplified treatment of the uncertainty of I/Q
measurements. Say you've got some input signal with a given SNR and you
run it into a I/Q demodulator - you get a series of I and Q measurements
Somehow I missed this message.
>This probably comes under tha category of more than you want to know...
No, it's NOT more than I want to know, it's what I want to know.
>Stanford published a series of lectures on GPS.
>https://www.youtube.com/playlist?list=PLGvhNIiu1ubyEOJga50LJMzVXtbUq6CPo
>I
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