On 7/19/2014 6:38 PM, Richard (Rick) Karlquist wrote:
Or
another way of putting it is you do a bunch of
measurements and then construct a theory to
explain what you already know experimentally.
I like that. Or perhaps, stated another way, in the real world engineers
are just as important as p
I don't know if this has any application for you or not but here it is. I
have had ground loop problems between the power safety ground and the TV
Cable shield. I used two 300 to 75 ohm transformers and coupled their 300
ohm sides with 27 pf capacitors. I put them in an aluminum box with onl
Attila,
>From my (past) CATV experience, ferrite-based devices don't introduce
"noise" as such but they can certainly pick up noise (or transmit) unless
they are toroidal or otherwise well screened.
However, they can introduce distortion if the winding flux density
approaches the ferrite's satura
Watch out for the tempco of transformers.
I ran into this with the TADD-1.
Removing the inductors/transformers improved the tempco by 15x.
http://www.leapsecond.com/pages/tadd-1/
/tvb
- Original Message -
From: "Attila Kinali"
To:
Sent: Saturday, July 19, 2014 3:09 PM
Subject: [time-
I did some tests of residual phase noise using an
Agilent E5505A and found that air coil inductors
did not add noise (at least down to my noise threshold)
but that ferrite core inductors had easily seen noise.
It was on the order of ADEV = 1E-10 close to the
carrier. I would describe this as nois
HI
As long as you have a really poor crystal oscillator (wide band loop) they are
quite easy to lock. If you have a high performance crystal oscillator (high Q /
narrow band loop) they are relatively difficult to lock. If you are trying to
*guarantee* a lock bandwidth and *guarantee* a level of
Hi
The general rule of thumb is that they add no noise or distortion. The typical
reason for not using them all the time is cost / size / weight.
A lot depends on what frequency (or frequency band) you are talking about and
what sort of transformers. Obviously you can indeed mis-use a part or
if you have enough buffering -- look for now noise amplifiers, which
have low h12 [= "backward gain " ] a quartz oscillator will not lock so
easy
On 7/19/2014 5:24 PM, Attila Kinali wrote:
On Sat, 19 Jul 2014 16:45:14 -0400
paul swed wrote:
Attilla I did look at some of the documents. B
On Sat, 19 Jul 2014 16:45:14 -0400
paul swed wrote:
> Attilla I did look at some of the documents. But none showed practical HF
> class injection locking. Say as an example a 6 MHz xtal to a 1 or 2 MHz
> reference.
> It maybe as easy as a single transistor in the oscillators ground lead.
> Always
Hi,
I'm currently looking at some way of breaking the ground loop between
several systems. The obvious idea would be to use transformers. I would
like to have some kind of rule of thumb to guess how much noise such
a transformer would add. But unfortunately i cannot find any theory
or measurements
Attilla I did look at some of the documents. But none showed practical HF
class injection locking. Say as an example a 6 MHz xtal to a 1 or 2 MHz
reference.
It maybe as easy as a single transistor in the oscillators ground lead.
Always on till a brief pulse from the 1 or 2 MHz ref cuts it off. I th
This looks like the same mechanical package and interface connector as
the venerable Symmetricom/HP 58534A timing receiver. All the
descriptions I can find describe identical function seemingly targeted
at the cellular base station market.
Does anyone have a pointer to documentation on these? Goo
Hi
A “temperature sensor crystal” is very much the same thing as a normal crystal
(except for angle of cut). The mounting is pretty much the same as the crystals
you have seen before. The only thing you do to improve the thermal coupling is
to do a backfill with something like helium. Backfill
On Wed, 25 Jun 2014 14:21:49 +0200
"Bernd Neubig" wrote:
> the time-nut approach for temperature measurement would be to use
> a temperature sensor crystal - like the good old Hewlett-Packard guys
>did many years ago. If you do not look for ultra-linearity of the frequency
> vs. temp response, t
On Tue, 24 Jun 2014 21:18:20 +0200
Francesco Messineo wrote:
> what would be the best method to try injection locking a butler common
> base crystal oscillator (see figure in
> http://www.eska.dk/oscillator_data.htm for schematic)?
> Any comment about close-in phase noise performance when adding
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