-boun...@febo.com] On
Behalf Of Magnus Danielson
Sent: Wednesday, February 08, 2012 4:51 PM
To: time-nuts@febo.com
Subject: Re: [time-nuts] Why a 10MHz sinewave output?
On 02/08/2012 03:25 PM, Craig S McCartney wrote:
> We already have one of those that everybody can use. It's called the
>
Lady Heather supports several versions of the Mayan and Aztec calendars (plus a
bunch of others). You can also specify a correlation constant offset to match
the date to whatever value your local high priest deems correct.
---
I thought the same thing but I think Mark w
ginal Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of Mark Sims
Sent: 08 February 2012 16:54
To: time-nuts@febo.com
Subject: [time-nuts] Why a 10MHz sinewave output?
It's slated for destruction around December 21 of
On 2/8/12 4:51 PM, Magnus Danielson wrote:
On 02/08/2012 03:25 PM, Craig S McCartney wrote:
We already have one of those that everybody can use. It's called the
earth.
Yes, but you don't have it hanging in a neat position in your office,
living room or lab, now do you? Besides, if you are a ti
On 02/08/2012 06:15 PM, Bob Camp wrote:
Hi
Some (but by no means all) gear actually looks at some of the data fields on
the T1 before it will accept it as a reference. In most cases a bits clock
does fine. Of course you do need a proper balanced line driver and all that
stuff to get it running.
On 02/08/2012 03:25 PM, Craig S McCartney wrote:
We already have one of those that everybody can use. It's called the
earth.
Yes, but you don't have it hanging in a neat position in your office,
living room or lab, now do you? Besides, if you are a time-nut your rock
will be more time-accura
David C. Partridge-
"Hey, you're not supposed to actually read those planning
applications for hyperspace bypasses!"
I suppose then it may be my fault.. ;-)
-Arthur
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] Why a 10MHz sinewave output?
It's slated for destruction around December 21 of this year...
We already have one of those that everybody can use. It's called the
earth.
___
time-nuts mailing list -- time-n
ate the framer clock and you are up and running.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of J.D. Schoedel
Sent: Wednesday, February 08, 2012 1:52 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [ti
It's slated for destruction around December 21 of this year...
We already have one of those that everybody can use. It's called the
earth.
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To u
12 12:41 AM
To: time-nuts@febo.com
Subject: Re: [time-nuts] Why a 10MHz sinewave output?
On 02/07/2012 09:02 AM, David J Taylor wrote:
> For the real analog fans, how about a 1 Hz sinewave output and watch
> for the zero-crossings! Precise? No!
11 uHz sine anyone, 24 hours period?
Che
Hal Murray wrote:
li...@rtty.us said:
Thank goodness for that inertia. I can still cable up a 100Kcps sine wave
standard to run stuff from "long ago". When I run into a box that uses a T1
signal for a clock reference - not so easy in the basement.
How much gear is there that uses T1 f
I think the real relation is 50 ohm coax is just
75 ohm air line with polyethylene dielectric added.
-Chuck Harris
Rick Karlquist wrote:
Azelio Boriani wrote:
Try this for a history about the 50 OHM impedance:
http://www.rfcafe.com/references/electrical/history-of-50-ohms.htm
The reference
ing the master and the other a slave from a clocking
perspective. This project will likely need to wait for my retirement.
--- On Tue, 2/7/12, Hal Murray wrote:
> From: Hal Murray
> Subject: Re: [time-nuts] Why a 10MHz sinewave output?
> To: "Discussion of precise time and fr
Azelio Boriani wrote:
> Try this for a history about the 50 OHM impedance:
> http://www.rfcafe.com/references/electrical/history-of-50-ohms.htm
>
The reference is full of errors. The lowest loss in coax
occurs when the ratio of the diameters is 3.6 to 1, regardless
of dielectric. For air dielect
Hi
Modern gear often has high input standard plugs. People tend to daisy chain
gear with T connectors. That makes for issues if they are all low impedance.
Bob
On Feb 7, 2012, at 5:31 PM, Chris Albertson wrote:
> On Tue, Feb 7, 2012 at 1:03 PM, Attila Kinali wrote:
>
>> Addendum: Your cou
On 2/7/12 1:30 PM, Attila Kinali wrote:
On Tue, 07 Feb 2012 16:15:44 -0500
Mike Naruta AA8K wrote:
On 02/07/2012 03:59 PM, Attila Kinali wrote:
while TV and radio uses 75R. (there was once a reason
for this, but i don't know it).
A 4:1 balun takes old 300 ohm twinlead to 75 ohms.
Thanks!
On Tue, Feb 7, 2012 at 1:03 PM, Attila Kinali wrote:
> Addendum: Your counter input is mostlikely 50R. Even if it just enters
> a chip, as the chip itself should be matched to 50R. The input impedance
> should be noted in the manual of the counter.
The counter specs say that any 2.5 volt or grea
Behalf Of Chris Albertson
Sent: Tuesday, February 07, 2012 3:19 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Why a 10MHz sinewave output?
Related question: Assuming I'm using 10MHz sine wave. What's the
best physical cable to use? Is there any good rea
On 2/7/2012 4:30 PM, Attila Kinali wrote:
On Tue, 07 Feb 2012 16:15:44 -0500
Mike Naruta AA8K wrote:
On 02/07/2012 03:59 PM, Attila Kinali wrote:
while TV and radio uses 75R. (there was once a reason
for this, but i don't know it).
A 4:1 balun takes old 300 ohm twinlead to 75 ohms.
Thanks
-boun...@febo.com] On
Behalf Of Attila Kinali
Sent: martes, 07 de febrero de 2012 21:59
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Why a 10MHz sinewave output?
On Tue, 7 Feb 2012 12:19:11 -0800
Chris Albertson wrote:
> Related question: Assuming I'
On Tue, Feb 7, 2012 at 1:30 PM, Attila Kinali wrote:
> On Tue, 07 Feb 2012 16:15:44 -0500
> Mike Naruta AA8K wrote:
>
>> On 02/07/2012 03:59 PM, Attila Kinali wrote:
>> > while TV and radio uses 75R. (there was once a reason
>> > for this, but i don't know it).
>>
>> A 4:1 balun takes old 300 ohm
Try this for a history about the 50 OHM impedance:
http://www.rfcafe.com/references/electrical/history-of-50-ohms.htm
On Tue, Feb 7, 2012 at 10:30 PM, Attila Kinali wrote:
> On Tue, 07 Feb 2012 16:15:44 -0500
> Mike Naruta AA8K wrote:
>
> > On 02/07/2012 03:59 PM, Attila Kinali wrote:
> > > whi
On Tue, 07 Feb 2012 16:15:44 -0500
Mike Naruta AA8K wrote:
> On 02/07/2012 03:59 PM, Attila Kinali wrote:
> > while TV and radio uses 75R. (there was once a reason
> > for this, but i don't know it).
>
> A 4:1 balun takes old 300 ohm twinlead to 75 ohms.
Thanks! This explains half it :-)
Do you
On Tue, 7 Feb 2012 21:59:18 +0100
Attila Kinali wrote:
> > Related question: Assuming I'm using 10MHz sine wave. What's the
> > best physical cable to use? Is there any good reason to use 50 ohm
> > cable? What about 75 ohm? I looked at a schematic of my counter
> > and it looks like the
On Tue, 7 Feb 2012 12:19:11 -0800
Chris Albertson wrote:
> Related question: Assuming I'm using 10MHz sine wave. What's the
> best physical cable to use? Is there any good reason to use 50 ohm
> cable? What about 75 ohm? I looked at a schematic of my counter
> and it looks like the 10MHz
Related question: Assuming I'm using 10MHz sine wave. What's the
best physical cable to use? Is there any good reason to use 50 ohm
cable? What about 75 ohm? I looked at a schematic of my counter
and it looks like the 10MHz signal hits some high impedance chip
inside.RG6 seems like the
On 02/07/2012 08:12 PM, Hal Murray wrote:
li...@rtty.us said:
Thank goodness for that inertia. I can still cable up a 100Kcps sine wave
standard to run stuff from "long ago". When I run into a box that uses a T1
signal for a clock reference - not so easy in the basement.
How much gear is ther
li...@rtty.us said:
> Thank goodness for that inertia. I can still cable up a 100Kcps sine wave
> standard to run stuff from "long ago". When I run into a box that uses a T1
> signal for a clock reference - not so easy in the basement.
How much gear is there that uses T1 for a clock input?
Is t
:time-nuts-boun...@febo.com] On
Behalf Of Magnus Danielson
Sent: Tuesday, February 07, 2012 3:33 AM
To: time-nuts@febo.com
Subject: Re: [time-nuts] Why a 10MHz sinewave output?
On 02/07/2012 02:16 AM, Bob Camp wrote:
> Hi
>
> When the customers started asking in the 1930's, generati
Or 23h 56m 4.091s
/tvb
11 uHz sine anyone, 24 hours period?
Cheers,
Magnus
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On 02/07/2012 09:02 AM, David J Taylor wrote:
For the real analog fans, how about a 1 Hz sinewave output and watch for
the zero-crossings! Precise? No!
11 uHz sine anyone, 24 hours period?
Cheers,
Magnus
___
time-nuts mailing list -- time-nuts@febo
On 02/07/2012 05:58 AM, Hal Murray wrote:
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 fil
On 02/07/2012 02:16 AM, Bob Camp wrote:
Hi
When the customers started asking in the 1930's, generating a square wave at
high frequency was not so easy….
Which is my point, the power of tradition can sometimes be stronger than
logical reasoning for the application needs. Today many of the
os
For the real analog fans, how about a 1 Hz sinewave output and watch for
the zero-crossings!Precise? No!
David
--
SatSignal software - quality software written to your requirements
Web: http://www.satsignal.eu
Email: david-tay...@blueyonder.co.uk
__
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.
--
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
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 freq
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 frequency to worry about"
_
> -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 ou
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.
--
http:/
wrote on 02/06/2012 09:37:59 AM:
> From: Jim Lux
> To: time-nuts@febo.com
> Date: 02/06/2012 09:38 AM
> Subject: Re: [time-nuts] Why a 10MHz sinewave output?
> Sent by: time-nuts-boun...@febo.com
>
> On 2/6/12 6:14 AM, paul swed wrote:
> > Indeed the long cable runs are
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 signa
ement
Subject: Re: [time-nuts] Why a 10MHz sinewave output?
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
interfere
with a lot of RF measurements.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of bob grant
Sent: Sunday, February 05, 2012 10:50 PM
To: time-nuts@febo.com
Subject: [time-nuts] Why a 10MHz sinewave output?
Why is 10MHz outp
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 wrote:
> On 2/6/12 6:47 AM, paul swed wrote:
>
>> Well right you are thats why todays chips have equalizers and such.
>> But
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 wi
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
and
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 th
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 wrote:
> On Sun, 05 Feb 2012 19
On Sun, 05 Feb 2012 19:50:28 -0800
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 squar
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 distribution within a equip
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