Hi,
I am continuing my phase noise measurement quest. I gathered
equipment (HP 8662a/11729C/8568B/multipliers) to measure
100Hz+ from the carrier. I now need to get a grip on the
0.1-100Hz range, which is where most of my applications are.
What is the suggested measurement methodology for this r
> I am continuing my phase noise measurement quest. I gathered
> equipment (HP 8662a/11729C/8568B/multipliers) to measure
> 100Hz+ from the carrier. I now need to get a grip on the
> 0.1-100Hz range, which is where most of my applications are.
>
> What is the suggested measurement methodology for
John Miles wrote:
>> I am continuing my phase noise measurement quest. I gathered
>> equipment (HP 8662a/11729C/8568B/multipliers) to measure
>> 100Hz+ from the carrier. I now need to get a grip on the
>> 0.1-100Hz range, which is where most of my applications are.
>>
>> What is the suggested measu
PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Close-in phase noise measurements
John Miles wrote:
>> I am continuing my phase noise measurement quest. I gathered
>> equipment (HP 8662a/11729C/8568B/multipliers) to measure
>> 100Hz+ from
Shane wrote:
> Wenzel has a setup you can purchase at low cost.
>
> http://www.wenzel.com/pdffiles1/PNTS%201000/BP-1000-SC.pdf
>
> Phase noise test sets can be pricey... $200K
>
Shane
Their calibration method is somewhat problematic at the low frequency
end where the effect of the PLL and th
Sent: Tuesday, March 25, 2008 8:22 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Close-in phase noise measurements
Shane wrote:
> Wenzel has a setup you can purchase at low cost.
>
> http://www.wenzel.com/pdffiles1/PNTS%201000/BP-1000-SC.pdf
>
> Ph
> Most, but not all, sound cards have a low frequency cutoff of 20Hz or so.
> Some (but not all) sound card ADCs can dc coupled.
> A high resolution dc coupled ADC may be more effective for frequencies
> below 20Hz.
True; I'm assuming that anyone using a sound card for these purposes is
either goi
John Miles wrote:
>> Most, but not all, sound cards have a low frequency cutoff of 20Hz or so.
>> Some (but not all) sound card ADCs can dc coupled.
>> A high resolution dc coupled ADC may be more effective for frequencies
>> below 20Hz.
>>
>
> True; I'm assuming that anyone using a sound card
Bruce Griffiths wrote:
> John Miles wrote:
>
>>> A dual mixer time difference system can have a lower noise floor than a
>>> single mixer system.
>>>
>>>
>> I wonder if those are still covered by patents in various corners of the
>> world, the way the TSC's dual-ADC architecture appe
Shane wrote:
> Do you know much about the R&S FSUP50?
>
> http://www2.rohde-schwarz.com/en/products/test_and_measurement/product_categ
> ories/spectrum_analysis/FSUP-%7C-Key_Facts-%7C-4-%7C-966.html
>
>
>
Shane
Only whats specified on the datasheet.
Its performance appears to be several 10's o
Shane wrote:
> Do you know much about the R&S FSUP50?
>
> http://www2.rohde-schwarz.com/en/products/test_and_measurement/product_categ
> ories/spectrum_analysis/FSUP-%7C-Key_Facts-%7C-4-%7C-966.html
>
This is a nice but expensive equipment.
Nice: can do PN measurement by phase quadrature(where y
t: Tuesday, March 25, 2008 8:22 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Close-in phase noise measurements
>
> Shane wrote:
>> Wenzel has a setup you can purchase at low cost.
>>
>> http://www.wenzel.com/pdffiles1/PNTS%201
om: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
>> Behalf Of Bruce Griffiths
>> Sent: Tuesday, March 25, 2008 8:22 PM
>> To: Discussion of precise time and frequency measurement
>> Subject: Re: [time-nuts] Close-in phase noise measurements
>>
>> Shane wrote:
&
Richard (Rick) Karlquist wrote:
> The relationship between phase noise and Allan variance is
> a complex one and was described in papers at FCS in 1976
> and 1978 by my previous manager Mike Fischer (then of HP).
> I think these papers come closest to answering your question.
>
> Rick Karlquist
>
>
Missing formula attached
bruce
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From: "Richard (Rick) Karlquist" <[EMAIL PROTECTED]>
Subject: Re: [time-nuts] Close-in phase noise measurements
Date: Sun, 30 Mar 2008 21:05:50 -0700
Message-ID: <[EMAIL PROTECTED]>
> The relationship between phase noise and Allan variance is
> a complex one and was d
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