If FLL: something that links frequencies,
PLL: something that links phases,
frequency detector: output proportional to frequency error,
phase detector: output proportional to phase error (XOR),
and the original question (about FLL) was how to implement a simple FLL,
can an FLL be made by a ph
Hi
The GPSTM (and similar) have at least one other “fatal flaw” compared to the
TBolt -
You can not tune the filter (control loop) parameters. That locks you in to the
“big hump”
Trimble ADEV that their default settings create.
If I was stuck on a solar battery stack, I think I’d prefer the
Hi
If it is an un-compensated crystal oscillator (I’d bet it is) there will be a
maximum temperature slope to the part.
In order to have absolute calibration, you would need to know both the
frequency read *and* the temperature
of the inside of the device. I’d bet somebody did the math, looked
HI
> On Aug 28, 2015, at 4:46 PM, Angus wrote:
>
> On Sun, 23 Aug 2015 23:36:27 -0400, you wrote:
>
>> Hi Angus,
>> Thanks for your reply. My original suspicion is the +6.5V rail. That needs
>> to come from somewhere, and you need headroom if it's an unregulated input.
>> Pumping 2A through a
Here is an update on the 57964-60 GPSDO board that I
bought. After figuring out what it needed for power
(it is definitely 5.6-6.0VDV) and communications as I
previously posted, I built it into a nice enclosure
and fed the 10 Mhz output into my modified Tbolt so
I could get a graph of the output. T
The uncertainly listed seems to be 7.6 mHz (milliHertz, or .0076 Hz. A
bit better that you mention..
On 8/28/2015 3:48 PM, Dr. David Kirkby (Kirkby Microwave Ltd) wrote:
> My LCR meter came back from Keysight UK last week, where it was
> calibrated. This instrument works at various frequencies f
Greetings Time Nuts Group Members
A few quick questions regarding the Trimble Thunderbolt and similar GPSDO
unit power consumption.
I've obtained and currently use the Thunderbolt GPSDO having the case top
power connector requiring a triple output supply. Being very happy with the
operation
On Sun, 23 Aug 2015 23:36:27 -0400, you wrote:
>Hi Angus,
>Thanks for your reply. My original suspicion is the +6.5V rail. That needs
>to come from somewhere, and you need headroom if it's an unregulated input.
>Pumping 2A through a regulator like that is no easy feat. Although rated
>for 3A, y
My LCR meter came back from Keysight UK last week, where it was
calibrated. This instrument works at various frequencies from 20 Hz to 1
MHz, so obviously has some sort of oscillator in it. But I don't think the
absolute accuracy on frequency is important on this, as it does not even
have the abil
Luciano wrote:
As for the amplifier the big job was finding the balance between the
polarization parameters, harmonic distortion and output power.
Many distribution amplifiers on the market have a Po max of + 13dBm
and this limit does not seem appropriate for this century.
I'm not aware of any
Azelio wrote:
OK: the XOR gate with an RC is a defective PLL and a defective FLL. It
is a simple way to have an idea of what an xLL should be but of no
serious use.
No, not at all. I was suggesting that the XOR PLL you were
commenting on had problems.
First, an XOR with or without an RC is
Hi
> On Aug 28, 2015, at 12:14 AM, Jim Lux wrote:
>
> On 8/27/15 4:46 PM, Bob Camp wrote:
>> Hi
>>
>>> On Aug 27, 2015, at 3:58 AM, Hal Murray wrote:
>>>
>>>
>>> kb...@n1k.org said:
> Is there anything fundamental about SC that forces the turn over
>>> temperature
> to be high?
>>>
Hi
Based on looking at about 40 or so similar units - I have never seen one that
was
> 1x10^-9 off frequency. Finding one that is >5x10^-10 off after running for a
> few days
is rare in my experience. The makes and models ranged over several types and
companies.
I have seen no group that is a
Hi
You can measure 2 cycles in at 100 GHz if you wish. Since these GPSDO’s only
put out 10 MHz, it would be a lot of work to multiply them up there. By far the
more
practical approach is to measure the phase offset at 10 MHz and go from there.
If one cycle in 1 second is 1x10^-7 (10 MHz signals)
Hi
> On Aug 28, 2015, at 6:16 AM, Azelio Boriani wrote:
>
> OK: the XOR gate with an RC is a defective PLL and a defective FLL. It
> is a simple way to have an idea of what an xLL should be but of no
> serious use.
>
Quite to the contrary, the XOR is a perfectly acceptable phase detector and
I remember you my post:
I have done some short time measurements (30 Min.) on the current generator, in
particular on the reference input and feedback input of the differential
amplifier Q6A and .Q6B (base pin to GND).
On the reference input Q6A I have a stability equivalent to more than +/-1nA
Someone was asking about changing cut angles and the effect. You might
find some useful stuff in Mark Haney's thesis "Design Technique for
Analog Temperature Compensation of Crystal Oscillators"
http://scholar.lib.vt.edu/theses/available/etd-11262001-111453/unrestricted/etd.pdf
Here's a matla
OK: the XOR gate with an RC is a defective PLL and a defective FLL. It
is a simple way to have an idea of what an xLL should be but of no
serious use.
On Fri, Aug 28, 2015 at 5:03 AM, Charles Steinmetz
wrote:
> Azelio wrote:
>
>> Since I have not found a strong definition for the FLL, I assumed:
Using the Fluke 732A as voltage reference improved HP5065A stability,
but not very much, so I looked closer at the constant-current
generator and the C-field pots "calibration":
http://phk.freebsd.dk/hacks/HP5065A/20150828_c_pot/index.html
... and found out that the current-sensing resist
Hello time-nuts,
As an experiment I took 10 FEI FE-5650A rubidium oscillators and measured
their frequency error (units were chosen randomly). These were 15MHz units
taken directly off the telecom cards with no modifications. These units
never went to China, and are pulls from working systems.
On 8/27/15 4:46 PM, Bob Camp wrote:
Hi
On Aug 27, 2015, at 3:58 AM, Hal Murray wrote:
kb...@n1k.org said:
Is there anything fundamental about SC that forces the turn over
temperature
to be high?
Simple answer yes. More complicated answer : that depends.
The crystal curve on an AT or
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