On Sun, 05 Feb 2012 19:50:28 -0800
bob grant bobgr...@fastmail.fm wrote:
Why is 10MHz output of many sources or distribution amps in the form of
a sinewave?
Is it something to do with signal reflections or ease of isolation?
Since zero crossing detectors are susceptible to noise wouldn't a
I really enjoyed that!
Rob Kimberley
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Sam
Sent: 06 February 2012 04:32
To: time-nuts@febo.com
Subject: [time-nuts] Brutal 5680 autopsy
Just came across another FE-5680A tear down video,
Indeed the long cable runs are tough. Though today we have differential
cable drivers that do quite well to the Ghz range. But certainly back in
the dark ages the sine wave was a very reasonable way to go.
Regards
Paul
On Mon, Feb 6, 2012 at 3:56 AM, Attila Kinali att...@kinali.ch wrote:
On
Well that is a great tear down. Though its a shame he shattered the rb bulb
to try to show re-activity to water. There's not enough Rb to have ever
mattered.
But still very useful when we might need to dig in to recover a bulb by
reheating it.
Will also say there is a lot of very clever approaches
On 2/6/12 6:14 AM, paul swed wrote:
Indeed the long cable runs are tough. Though today we have differential
cable drivers that do quite well to the Ghz range. But certainly back in
the dark ages the sine wave was a very reasonable way to go.
Regards
Paul
we may have GHz bandwidth drivers, but
Well right you are thats why todays chips have equalizers and such.
But then its all getting crazy complicated even though its in a itty bitty
chip.
My distribution is made of high quality television analog amps and I have
in general made amplifiers and such with parts I can still easily pickup
Unfortunately my programmer is only able to erase/program/verify the PSD
chip. The read option is not available! :-(
To dump the firmware I need to desolder the chip and prepare a dedicated
testbed: before doing this on a working FE-5680A, is there anyone of you
who want to sell me a *nonworking*
On 2/6/12 6:47 AM, paul swed wrote:
Well right you are thats why todays chips have equalizers and such.
But then its all getting crazy complicated even though its in a itty bitty
chip.
My distribution is made of high quality television analog amps and I have
in general made amplifiers and such
Jim
I want to be careful this is not my thread.
the question came up.
Why sine wave.
Though I do appreciate your comments.
Regards
On Mon, Feb 6, 2012 at 10:26 AM, Jim Lux jim...@earthlink.net wrote:
On 2/6/12 6:47 AM, paul swed wrote:
Well right you are thats why todays chips have equalizers
Hi
In addition to the stuff already mentioned, there's one more reason: RFI
If you want to run around with a 10 MHz square wave with 1 ns rise time
edges, it's going to have energy all over the place. To keep the rise time
you will get well into the GHz. That may (as in probably will) interfere
Hi
Differential signaling does indeed take care of a bunch of stuff. The gotcha
is that both sender and receiver need to agree on levels and stuff like
that. Most of these logic families have pretty short life spans if you
include supply voltage dependant stuff. Could you work it out over the
Hi
If you look closely at the lamp (pre-destruction) you can see where it's
begun to discolor.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Sam
Sent: Sunday, February 05, 2012 11:32 PM
To: time-nuts@febo.com
Subject:
Indeed I did see that also. I was also looking for the metalization that
occurs even later in age, but did not see any as he kept flipping it around.
It was interesting that he crushed the rb bulb and that he expected some
major nuclear reaction. Someone could have used that RB lamp and the filter
bob grant wrote:
Why is 10MHz output of many sources or distribution amps in the form of
a sinewave?
Is it something to do with signal reflections or ease of isolation?
Since zero crossing detectors are susceptible to noise wouldn't a fast
TTL square
wave be more appropriate for signal
As mentioned below, the propagation speed of the various harmonics varies.
What also varies is the temperature coefficient of propagation speed.
This, taken with imperfect impedance matches, yields complicated variation
of zero-crossing times with temperature.
The tempcos are particularly large
Some sine-wave outputs are not very symmetrical, in that the rising
edges
are much more sinusoidal in shape than the falling edges.
I guess my question is really about what type of input circuity and
drive
level are most common and which signal shape would provide the lowest
jitter.
--
I've been considering ripping the firmware from the mcu as well. I've not
got beyond the consideration stages, but i have all the equipment here at
work. When you say that the read option is not available. is this because
the chip has protection fuses enabled?
Also, what programmer do you have,
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-
boun...@febo.com] On Behalf Of bob grant
Sent: Monday, February 06, 2012 12:41 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Why a 10MHz sinewave output?
Some
On 02/06/2012 02:56 AM, Bob Camp wrote:
Hi
I suspect it's a linear compensation of a temperature effect that's actually
higher order. Depending on exactly where you are it could be a good thing or a
very bad thing. I have seen examples of both …
Indeed. If you sit tight the detectors
From: Steve . iteratio...@gmail.com
I've been considering ripping the firmware from the mcu as well. I've not
got beyond the consideration stages, but i have all the equipment here at
work. When you say that the read option is not available. is this because
the chip has protection fuses
On 02/07/2012 01:02 AM, Jim Lux wrote:
On 2/6/12 7:41 AM, paul swed wrote:
Jim
I want to be careful this is not my thread.
the question came up.
Why sine wave.
Though I do appreciate your comments.
Regards
I think it boils down to it's easier to get high precision when you
only have one
Hi
When the customers started asking in the 1930's, generating a square wave at
high frequency was not so easy….
Bob
On Feb 6, 2012, at 7:20 PM, Magnus Danielson wrote:
On 02/07/2012 01:02 AM, Jim Lux wrote:
On 2/6/12 7:41 AM, paul swed wrote:
Jim
I want to be careful this is not my
mag...@rubidium.dyndns.org said:
Not quite right. If you lock up the clock, you do not lock to the birds,
but to GPS time or UTC as received over GPS. The observed time of the birds
would be a bad solution since you can't see a particular bird continously
unless you is in geosync orbit.
mag...@rubidium.dyndns.org said:
Oh... nothing really beats it's what customers traditionally asks for
Squarewave out provides high slew-rate which reduces the effect of
additional noise.
Right. But if you have a single frequency you can easily filter out most of
the noise.
---
On Sun, 5 Feb 2012 19:55:36 -0900 (AKST)
Richard H McCorkle mccor...@ptialaska.net wrote:
While using a faster timebase or higher interpolator gain increases
the resolution that doesnt imply the accuracy will also increase. The
PICTIC II uses CMOS logic with propagation delays that vary
25 matches
Mail list logo
