Hi
The gotcha is that the injection gain is phase angle dependent.
Bob
On Jun 16, 2010, at 1:57 AM, Magnus Danielson wrote:
On 06/16/2010 05:45 AM, Charles P. Steinmetz wrote:
Warren wrote:
Charles posted:
but the locked frequency will be different from both oscillators'
free-running
Modulation Analyzer! Now that's the ticket! I have an 8901A and 8901B. I
also have a 53310A.
Now all I have to do is dig them out of the pile.
In my quest to 'update' my 1950's workshop, I have been collecting 1980's
vintage HP and TEK test equipment. As I find something I think might be
The default parameters are a compromise. The thunderbolt was originally used
to provide time and frequency, though I understand not always frequency, for
cellsites. Though heated and air conditioned, I suspect they had pretty good
temperature swings. Also, the sky view was not always optimum. It
In my world, successive gains multiply, not add.
A series of three gains of 10 gives a gain of 1000, not 30.
What am I missing?
Bill Hawkins
-Original Message-
From: Magnus Danielson
Sent: Wednesday, June 16, 2010 12:58 AM
What you get is a scale error. Consider that you have an
Joe,
If you have an analog 'scope with delayed sweep, set it up with the main
time base
showing the 90 MHz signal in a convenient way (say 1 cycle/div) and then
use the delay to look at the signal some time later (after the initial trigger)
with
the modulation on and off. Any phase or
Bob posted
The gotcha is that the injection gain is phase angle dependent.
So what? and it is also dependant on a whole bunch of other stuff, amplitude
being a major one.
And the gotcha you to your gotcha is that the phase difference in the TPLL
is fixed at very close at 90 deg.
(zero on
Hi
If the oscillator you have happens to injection lock at 90 degrees, or quite
near it, then that's not going to help. If the oscillator you have likes to
lock at 21 degrees then it will help you out. The angle varies device to
device.
Bob
-Original Message-
From:
Hi
The Andrew boxes most of the TBolts came out of were designed for E-911
location service. The idea was to use time difference of arrival at multiple
sites to triangulate a cell phone. For what ever reason, they decided a
fast tracking of GPS time was going to give them the best results. I
On 06/16/2010 04:30 PM, Bill Hawkins wrote:
In my world, successive gains multiply, not add.
A series of three gains of 10 gives a gain of 1000, not 30.
What am I missing?
They are parallel.
Cheers,
Magnus
___
time-nuts mailing list --
On 06/16/2010 06:16 PM, Bob Camp wrote:
Hi
If the oscillator you have happens to injection lock at 90 degrees, or quite
near it, then that's not going to help. If the oscillator you have likes to
lock at 21 degrees then it will help you out. The angle varies device to
device.
If the injection
Hello,
I'm trying to put gps (for a coarse timing sync and RTC
auto-setting) to a small controller that must be completely
galvanically decoupled from outside world. Antenna power must be
supplied from separate power source (ground potential of isolated part
of circuit can slowly float up to +/-
Hi
The DC isolation part should be pretty simple. There are off the shelf RF
transformers that are rated for the frequencies you are looking at. Weather
they are rated for 250 volts or not I don't know. MA-Com is one source:
In a message dated 16/06/2010 22:11:28 GMT Daylight Time, y...@ostry.ru
writes:
I'm trying to put gps (for a coarse timing sync and RTC
auto-setting) to a small controller that must be completely
galvanically decoupled from outside world. Antenna power must be
supplied from separate power
Yuri,
Why don't you get a small GPS and keep it with the antenna, and isolate the
digital side of the GPS with opto couplers? Supply power to the GPS, and
the GPS supplies power to the antenna. Optically couple the digital side to
your controller. The RF transformer you might come across
Hi Yuri,
Hello,
I'm trying to put gps (for a coarse timing sync and RTC
auto-setting) to a small controller that must be completely
galvanically decoupled from outside world. Antenna power must be
supplied from separate power source (ground potential of isolated part
of circuit can slowly
Yuri,
It is not clear to me why the antenna should be isolated from the receiver, I
would prefer to keep the antenna and receiver on the same return, and isolate
that assembly from the rest of the world.
It is much easier to provide isolation on the supply, RS-232 and 10MHz (if you
use it)
Hello,
Thursday, June 17, 2010, 2:44:43, Didier Juges wrote:
D It is not clear to me why the antenna should be isolated from the
D receiver, I would prefer to keep the antenna and receiver on the
D same return, and isolate that assembly from the rest of the world.
D It is much easier to provide
So you're having something like that in mind?
http://www.polytron.de/Produkte/G07.pdf
4...2400 MHz / 1000V
Yuri Ostry schrieb:
Hello,
Thursday, June 17, 2010, 2:44:43, Didier Juges wrote:
D It is not clear to me why the antenna should be isolated from the
D receiver, I would prefer to keep
Warren wrote:
Charles Posted:
How much EFC is required depends, in part, on the strength of the pulling.
There are three varying inputs.
NOT at ALL what my test have shown so I guess we do NOT agree on this.
The point you missed, is only the EFC is changing significantly
because of the
The phase modulation is working.
I tried the oscilloscope set up that Francis suggested but I could not
convince myself that anything was happening. However, my 53310A did the
trick. A quick push of the 'AutoScale' button and it was definitely clear
that Mod was either On or Off.
I do have a
Charles
I'm curious how you determined that the oscillators are being held to
within femtoseconds of each other.
I done it several ways including measuring the PD output.
You seem to be missing how insignificant an 1-e6 injection locking to EFC
gain ratio is.
I can't detail, to your
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