On 1/27/2015 11:57 PM, Bruce Griffiths wrote:
/The only viable solution is to use better filtering of the output of a
switching multiplier./
What about filtering the doubler output with a 10 MHz xtal ?
73 Alberto I2PHD
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Gerhard,
On 01/27/2015 09:00 PM, Gerhard Hoffmann wrote:
Hi, fellow time nuts,
I have some questions regarding the Stanford SR620:
1. Is it a drawback wrt ADEV when a SR620 does not have have the opt. oven
if I have an ultra clean external reference? Does it use the external
ref directly
or
Stu
Thanks for the great information feedback.
No, No, the ~3e-12 is Not an error in the H/W. That would of course cause a
constant phase drift error to accumulate.
The Tbolt has no trouble holding 1e-12 control or even better than 1e-13 when
using the extended time constant mode with an
Stewart
The part that I do not understand is how the TBolt is able to calculate
such high resolution frequency offset answers on its Osc ppt output
so fast. The frequency offset answers seem to have way too high of
absolute accuracy compared to what is possible using the phase data.
Example:
Gerhard wrote:
1. Is it a drawback wrt ADEV when a SR620 does not have have the opt. oven
if I have an ultra clean external reference? Does it use the
external ref directly
or does it just pull the own reference to the external value in the long run,
no matter if it's the good or the bad
Bruce wrote:
Using the square law characteristic will inevitably increase the
phase noise floor particularly in the flicker region with respect to
just using the switching characteristic of a JFET, diode or
BJT (non saturated).
Even FETs with very large transconductance and low pinchoff
I have verified the Skytraq claim on my stand alone NS-T.
Tue Jan 27 06:52:06 UTC 2015
$GPGGA,065206.000,4847.3506,N,00216.3005,E,1,06,1.3,191.0,M,47.0,M,,*59
Tue Jan 27 06:52:06 UTC 2015 $GPGLL,4847.3506,N,00216.3005,E,065206.000,A,A*52
Tue Jan 27 06:52:06 UTC 2015
Andrea, an answer your original Toko data question below.
Message: 12
Date: Tue, 27 Jan 2015 16:53:07 +0100
From: Andrea Baldoni erm1ea...@ermione.com
To: time-nuts@febo.com
Subject: [time-nuts] 510 doubler and old Toko RF catalogue (Cirkit2nd
ed.1994)
cut some stuff
Finally I found that
The Tbolt computes phase error by doing a position fix. It computes
frequency error by doing a velocity fix. These two fixes use almost the
same algorithm, a least-squares fit that incorporates the line-of-sight
vectors to each satellite.
The position fix starts with the pseudorange (distance) to
Am 28.01.2015 um 00:23 schrieb Magnus Danielson:
It locks it up with a PLL. See page 9 in PDF below, smack in the
middle is the input circuit and PLL.
This page also gives you all the hints of how to wire in a better
oscillator if you wish.
2 I have seen that the manual has a parts list
I have verified the Skytraq claim on my stand alone NS-T.
Tue Jan 27 06:52:06 UTC 2015 $GPGGA,065206.000,4847.3506
Hi Mike,
Please use more precise timestamps so your results can be believed. In general
it's not adequate to use one second unix time stamps to identify a possible one
second
Am 28.01.2015 um 00:59 schrieb Alberto di Bene:
On 1/27/2015 11:57 PM, Bruce Griffiths wrote:
/The only viable solution is to use better filtering of the output of
a switching multiplier./
What about filtering the doubler output with a 10 MHz xtal ?
73 Alberto I2PHD
In a correctly
I think another spinoff from Cirkit was Mainline Electronics of Leicester.
They also mostly disappeared (though I have wondered if they still trade as
the ebay seller anonalouise, who seems to have similar stock).
Mainline Electronics seems to exist as a Russian website, and it looks as
though
Gerhard wrote:
It is a different game when you want to notch away sub/harmonics.
One problem with using crystals as traps (notch filters) is that the
series resistance of a crystal is several orders of magnitude higher
than that of a good series-resonant LC -- generally in the 50-100 ohm
Skytraq has provided updated firmware that corrects the 1 second offset.
For those who have not already, please contact us off list for return
instructions to have your unit updated.
Thank you for your patience with this issue. According to Skytraq the
error was introduced when code was added
I wrote:
Once upon a time, Motorola made monolithic quad BJTs -- but I'm not
aware of any matched quads similar to 2Ns at this time.
Gerhard replied:
There still are
MAT04
HFA3046-3096-3127-3128
if duals are enough:
SSM2220
MAT12
also mat02, mat03, maybe SSM2110 [probably meant
This site is quite helpful. I happened to pick up several toko kits last
years and the data is here.
Thank you
On Wed, Jan 28, 2015 at 5:00 AM, David t_list_1_o...@braw.co.uk wrote:
Andrea, an answer your original Toko data question below.
Message: 12
Date: Tue, 27 Jan 2015 16:53:07 +0100
Am 28.01.2015 um 01:57 schrieb Charles Steinmetz:
(again, not many of us amateur time nuts). Once upon a time, Motorola
made monolithic quad BJTs -- but I'm not aware of any matched quads
similar to 2Ns at this time. [Several manufacturers still claim
to make MPQs, but those are not
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