Ed Palmer wrote:
Yes, I have the same configuration. The part number for the divider
board is 05061-6165. The 10811 + daughter boards are used in the
105B, 5061B Cesium, and the 5065A Rubidium. The circuit loading
problem is exactly the kind of issue I was expecting. Thanks for the
of it isn't immediately
obvious. :-)
Ed
Bruce Griffiths wrote:
Ed Palmer wrote:
I have a late-model 105B Oscillator that's equipped with a
10811-60109 oscillator. It seems a shame to have that nice 10 MHz
source without having access to it. I was thinking of adding a
buffer amp and bringing out
If you send me the schematic for the circuit in which its used I can
answer that question better.
Bruce
Ed Palmer wrote:
Perhaps, but given what it's replacing and what it's driving, is the
difference significant?
Ed
Bruce Griffiths wrote:
Ed Palmer wrote:
Yes, I have the same
Alexander Sack wrote:
On Mon, Dec 7, 2009 at 6:07 PM, Bruce Griffiths
bruce.griffi...@xtra.co.nz wrote:
Alexander Sack wrote:
On Mon, Dec 7, 2009 at 5:20 PM, Bruce Griffiths
bruce.griffi...@xtra.co.nzwrote:
Alexander Sack wrote:
Hi Everybody:
First post
Scott Mace wrote:
On 12/07/2009 04:13 PM, Alexander Sack wrote:
Hi Everybody:
First post, be gentle. I did some mail-list archive searching and it
seems
that a lot of folks have used the Garmin 18x LVC as their 1PPS sync
for the
desktop with varied success (5V via USB port and RS-232 for
page. I'm
sure that I'm not the only one who would be interested.
Ed
Bruce Griffiths wrote:
Ed
If it helps I can send you some LTSpice schematics so that you can
simulate the circuit for yourself.
The breadboards behave as predicted by the simulations at 10MHz.
John Miles has done some
Since the T13-1 has a centre tapped secondary there are 2 useful
amplifier configurations that can be used.
One has a nominal gain of about 5dB whereas the other has a gain of
around -1dB (can still be useful since the amplifier input impedance at
10Mhz is about 1k when the 51 ohm input shunt
://www.kennethkuhn.com/hpmuseum/scans/hp5065a_part3.pdf on pages
93-101 (pdf pages - not document pages). However, this copy doesn't
show the schematic for the power supply board. I also see that
document page 8-54 is missing which might be the problem.
Ed
Bruce Griffiths wrote:
If you send me
Since a levelled generator requires a detector with a flat frequency
response, calibrating a scope so that it can in turn be used to measure
power is a somewhat circular process.
In the 1970's NBS used a matched pair of schottky diode detectors
mounted in the same temperature controlled
Corby Dawson wrote:
Hi,
Can any one steer me to an explanation of the following setup.
I think I understand the capacitor but not the resistor.
In the 106D DMTD unit I have, the BNC jacks are of the isolated variety.
The center pin and the shield both come out to pins on the rear of the
Mario Sanchez wrote:
Hi Bruce...
Thanks for your answer...
I have a couple of questions:
1. I am using a 1kHz beat frequency, and measure back2back period using a
Pendulum CNT-91 high resolution frequency counter. Does the DC stability of
the mixer still matter?
2. I have been comparing the
Ulrich Bangert wrote:
Gentlemen,
if anyone of you has the circuit diagram of a 8563A's A14 and A15 circuit
boards available, this would be of great help to a friend of mine. He is
also in search for a 83620A service manual.
Best regards
Ulrich Bangert
www.ulrich-bangert.de
Ortholzer Weg 1
Both the lamp and the absorption cell contain rubidium.
The rubidium in the lamp is slowly absorbed by the glass container.
The rubidim in the absorption cell is mixed with a buffer gas and
presumably has a much lower rate of absorption by the cell walls.
The rubidium lamp becomes unusable due
Poul-Henning Kamp wrote:
In message4b0b0ed6.3080...@xtra.co.nz, Bruce Griffiths writes:
This lamp wear out mechanism is avoided if one uses laser interrogation
of the absorption cell.
About that...
Isn't that the sort of experiement we should try to lure Tom into doing
Bruce Griffiths wrote:
Poul-Henning Kamp wrote:
In message4b0b0ed6.3080...@xtra.co.nz, Bruce Griffiths writes:
This lamp wear out mechanism is avoided if one uses laser interrogation
of the absorption cell.
About that...
Isn't that the sort of experiement we should try to lure Tom
iov...@inwind.it wrote:
Thanks all.
The conclusion seems to be that an ordinary and stationary GPS receiver with a
single
omnidiretional antenna knows very well where satellites are relative to the
true North,
and where the true North is relative to satellites, but doesn't know (more
Neville Michie wrote:
When you think of time specifications from GPS, the GPS system is a
poor way to find north.
Even with a base line of 1000 metres you only have a fraction of a
degree.
The GPS system may be useful to get accurate time to simplify a star
observation, from a known (GPS)
When a star tracker is used as a stellar compass in effect takes
simultaneous fixes on several stars and the better ones are capable of
an rms error of a few arc seconds, largely limited by atmospheric
instability.
These are usually used for determining space vehicle attitude, in which
case
Mike
Instead of relying on the dubious claims of those marketing an extremely
inefficient jammer it would be better to actually do some simple
calculations.
Typical commercial receivers stop tracking with a Jam to signal ratio of
not more than 60dB or so:
Didier
As jammers those devices are extremely inefficient.
They may well rely on the inefficient generation and radiation of a very
high order harmonic of the clock of an unshielded legal device.
A commercial GPS receiver may require a signal as small as 60dB (depends
on the operating mode,
...@rubidium.dyndns.org wrote:
Bruce Griffiths wrote:
Hej Magnus
To confuse matters Minicircuits use the term active mixer for a
conventional diode mixer that uses amplifiers on the LO and/or RF ports to
boost signal levels.
While it confuses matters, it is usefull to know
Mario Sanchez wrote:
Hi all,
I am starting building a DMTD, and for simplicity reasons I started with
active mixers...
What are the advantages/disadvantages of using passive mixers instead?
Someone has had the experience to compare them?
As LO, I am using a Synthesizer whose amplitude is
Magnus Danielson wrote:
Bruce Griffiths wrote:
Magnus Danielson wrote:
Bruce Griffiths wrote:
Active mixers almost invariably have a higher noise floor than
passive mixers, particularly in the flicker noise region.
Consequently a DMTD system using active mixers will have a higher
system
Tom Van Baak wrote:
Mark,
Your 5.5 mHz is correct for the frequency difference But
note that's out of 10 MHz so the *relative* frequency error
is 5.5e-3 Hz / 1e7 Hz, or 5.5e-10 (unit-less).
The other way to look at it is this:
The nominal frequency is 10 MHz, so one period is 100 ns.
Your
Hal Murray wrote:
I've been thinking of how to make a sidereal clock that's very
accurate. Things like time of coincidence between sidereal and UTC0 or
better UTC1 come up. There are very few sources for UTC1.
How far out do you want to go on the time-nut scale?
A radio astronomy
Roberto Barrios wrote:
Date: Sun, 25 Oct 2009 14:42:08 +1300
From: Bruce Griffiths bruce.griffi...@xtra.co.nz
Subject: Re: [time-nuts] LPRO101 Lamp Exciter Frequency
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Message-ID: 4ae3acf0.3080...@xtra.co.nz
Content
Doug G4DZU wrote:
Hi,
One of my LPRO101's also won't lock, you mention a repair guide by PE1FBO.
I've search the web and can't find a source for this, is it possible you
could advise me of it's location.
best 73s
Doug
G4DZU
Roberto Barrios wrote:
Date: Sat, 24 Oct 2009 09:35:03 +1300
From: Bruce Griffiths bruce.griffi...@xtra.co.nz
Subject: Re: [time-nuts] LPRO101 Lamp Exciter Frequency
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Message-ID: 4ae21377.7070...@xtra.co.nz
Content
Roberto Barrios wrote:
Date: Sun, 25 Oct 2009 10:24:38 +1300
From: Bruce Griffiths bruce.griffi...@xtra.co.nz
Subject: Re: [time-nuts] LPRO101 Lamp Exciter Frequency
To: Discussion of precise time and frequency measurement
Message-ID: 4ae37096.5030...@xtra.co.nz
Content-Type: text
Roberto Barrios wrote:
Hi all,
I've got an LPRO101 that refuses to lock and you sure will be of great help.
These devices are quite cheap but I'm trying to learn in the repair process.
I've followed PE1FBO's repair guide and everything noted there seems ok. I
could not
I'll open it up reseat all the
boards. It couldn't hurt.
Joe
On Fri, Oct 9, 2009 at 11:51 PM, Bruce Griffiths
bruce.griffi...@xtra.co.nz wrote:
Joseph Gray wrote:
I just got a 5370A locally and am going through the performance
checks. Things are not as they should
swingbyte wrote:
Bruce Griffiths wrote:
swingbyte wrote:
HI all ,
I had a 5370 A shipped to me that suffered enough of a drop/roll to
break a handle and bend the chassis such that the bottom panel had to
be modified to get it back on. When I connected the timebase output
to the start
Joe
You can check a lot of the functionality from the front panel.
Make sure that it works well using the front panel controls before
checking that the HPIB interface works.
To check the HPIB functionality you will need an HPIB/GPIB interface for
your PC.
It is easy to duplicate the tests done
swingbyte wrote:
Bruce Griffiths wrote:
swingbyte wrote:
Bruce Griffiths wrote:
swingbyte wrote:
HI all ,
I had a 5370 A shipped to me that suffered enough of a drop/roll to
break a handle and bend the chassis such that the bottom panel had to
be modified to get it back
swingbyte wrote:
HI all ,
I had a 5370 A shipped to me that suffered enough of a drop/roll to
break a handle and bend the chassis such that the bottom panel had to
be modified to get it back on. When I connected the timebase output
to the start input the frequency display is 10.000xx
Joseph Gray wrote:
I just got a 5370A locally and am going through the performance
checks. Things are not as they should be. Is there someone who knows
this unit intimately who would be willing to help me off list?
Joe Gray
KA5ZEC
Joe
What do you have in the way of test gear?
A 100+MHz
Said
You mean as in figure 31 on page 40 of
http://www.u-blox.com/images/downloads/Product_Docs/LEA-5_NEO-5_TIM-5H_HardwareIntegrationManual(GPS.G5-MS5-09027).pdf
http://www.u-blox.com/images/downloads/Product_Docs/LEA-5_NEO-5_TIM-5H_HardwareIntegrationManual%28GPS.G5-MS5-09027%29.pdf
The only
saidj...@aol.com wrote:
Hi Bruce,
in response to the active antenna biasing discussion we had a couple of
days ago: there is a good reference I ran across with inductor part number,
schematic, and layout in the uBlox literature (hardware reference manuals)
on the uBlox website. They
Neville Michie wrote:
Hi,
I am constructing a phase meter to monitor the phase creep of clocks.
It consists of a BCD counter counting say microseconds that has its
count strobed into a latch by a pulse from the clock.
The Latch drives a DAC which drives a pen recorder and an analogue
data
Joseph Gray wrote:
Another newbie question (sorry). I'm using an HP 5315A Universal
Counter and doing some basic experiments to teach myself.
Here is the setup: 100KHz square wave as the A input to the 5315A.
Using a BNC-tee to connect a length of RG58A/U from A to the B
input and another
Joe
Joseph Gray wrote:
Bruce, thanks for the very helpful advice. My comments are interspersed below.
You need to measure this delay.
Split the signal in 2 and feed it to both inputs with nominally equal
length cables.
Measure the difference then swap the 2 cables over and measure the
Joe
Joseph Gray wrote:
Did you use a resistive splitter or just a tee to split the signal?
Just a tee. I have tees and terminators at each input of the 5315A as well.
You need to use a resistive splitter and not a tee to control reflections.
If you don't have one, make one using 3
significant error outside the loop is the Osc its self and Osc's
internal EFC offset.
The EFC range being used during a measurement period is typically less than
1/1000 of its range.
ws
- Original Message -
From: Bruce Griffiths bruce.griffi...@xtra.co.nz
To: WarrenS
isolation/buffer amps. It's something I'll get back
to when
I've lower the noise more to see if there is anything below the present
noise level.
ws
***
From: Bruce Griffiths bruce.griffi...@xtra.co.nz
Bruce
WarrenS wrote:
I have been using a simple low cost, high performance alternate solution to
the standard Dual Mixer/DMTD.
The idea is based on an analog version of NIST's Tight Phase-Lock Loop
Method of measuring Freq stability.
http://tf.nist.gov/phase/Properties/one.htm#oneone fig
WarrenS wrote:
Bruce
Yes, there are a few disadvantages using this simple low cost
configuration
along with all of its advantages.
You can not get everything for nothing, but you can get higher speed,
better
resolution and less noise from this.
This can not be used to evaluate the
the noise more to see if there is anything below the present noise
level.
ws
***
From: Bruce Griffiths bruce.griffi...@xtra.co.nz
Bruce
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Martyn Smith wrote:
Hello,
I asked a question about fibre optic, but the problem has been solved.
It had nothing to do with the fibre optic unit.
But if anyone does have any thoughts on using a fibre optic link, and
any pitfalls, I'd be intertesed.
Cheers
Martyn
There are at least 2
Brian
Brian Kirby wrote:
I have toyed with the idea of building a Dual Mixer Time Difference
setup for testing oscillators. I have attached a drawing I made and I
have a few areas I need to clear up.
At Point #1 on the drawing (the output of the mixers) I expect to see
20 mhz and the 100
Brian Kirby wrote:
I have toyed with the idea of building a Dual Mixer Time Difference
setup for testing oscillators. I have attached a drawing I made and I
have a few areas I need to clear up.
At Point #1 on the drawing (the output of the mixers) I expect to see
20 mhz and the 100 hertz
Magnus Danielson wrote:
jmfranke wrote:
I used a bias tee with a capacitor block. I varied the resistor
until I could see signals coming from the external antenna, the built
in patch was shielded with aluminum foil and the receiver verified
that no signals were coming from the internal
saidj...@aol.com wrote:
Hi Bruce,
but at first resonance (self resonance) the inductor has the highest
impedance that it will ever have (theoretically infinite impedance), which is
what you want in a bias-t...
bye,
Said
In a message dated 10/1/2009 19:56:03 Pacific
Douglas Wire - PUPCo Studios wrote:
Ahh, I kind of hate to show my ignorance to the list here, but I am so used
to it by now. I have an old evaluation board from Synergy Systems for what
would appear to be even the old Motorola built (not iLotus) M12M style GPS
timing board. The problem I am
Bruce Griffiths wrote:
Douglas
I have one of these for the M12+T.
Yes it requires a higher voltage.
There is a surface mount 7805V regulator on board so an input voltage of
9V or so is recommended (thats what is supplied by the plugpack that
came with it).
There is a 3V SMT regulator
Joseph Gray wrote:
From looking at the EFC graph, I assume that even after almost 48
hours, the GPSDO hasn't yet reached it's best performance (correct?).
The PU at this time 3.4uS. I understand that this is a prediction for
the next 24hrs if GPS lock is lost. The question is, what does the
gandal...@aol.com wrote:
In a message dated 26/09/2009 13:33:12 GMT Daylight Time,
xi...@btinternet.com writes:
Boring mode - ON
With reference to the subject matter and my previous posting, I can
confirm in the true Orwellian manner that all 74HC4046 devices are equal
except that
Joe McElvenney wrote:
Hi,
A fellow amateur and I have just put together the GPS-based frequency
reference published in the Every day Practical Electronics issue of
April/May 2009 and are both experiencing the same problem. The type-3
phase comparator of the 74HC4046 has both 1-pps and 50kHz
Joe McElvenney wrote:
Hi,
A fellow amateur and I have just put together the GPS-based frequency
reference published in the Every day Practical Electronics issue of
April/May 2009 and are both experiencing the same problem. The type-3
phase comparator of the 74HC4046 has both 1-pps and 50kHz
Not surprising, given that there is typically about 30ns clock to output
delay per HC390 (divide by 2 and divide by 5 asynchronously cascaded)
with 7 asynchronously cascaded 390's between the 10MHz clock input and a
1PPS output having a typical total clock to output delay of 210ns with a
tempco of
Magnus Danielson wrote:
John Miles wrote:
Interesting! 500 picoseconds is a lot of drift. Can you try 74AC390s as
well?
While that may be interesting, I think we should stop here and think a
little... where would a seemingly stable oscillation/beat frequency
with a period of about 1250
Bob
Robert Darlington wrote:
Hello all,
I'm trying to adjust the time between the leading edge of the PPS square
wave and the 10MHz zero crossing outputs on a Trimble Thunderbolt. The
manual seems to indicate the cable delay compensation setting will do this.
No, it doesnt.
This only
the jitter. Reading
the manual, I don't see any clear explanation like what you just gave me. I
see my mistake in manual interpretation but not until after reading your
reply. Thank you.
-Bob
On Sat, Sep 19, 2009 at 5:18 PM, Bruce Griffiths bruce.griffi...@xtra.co.nz
wrote
Martyn Smith wrote:
Hello,
Can anyone advise how I can measure the frequency accuracy of my 10
MHz standard at gate times of 1 ms and 100 microseconds.
I have the Wenzle program that calulates Allan Variance from phase
noise, but don't know how reliable that is.
The 1 second Allan
Rick Karlquist wrote:
Lux, Jim (337C) wrote:
impurities. The JHU crystals are apparently in some type of glass
enclosure which can take the high temperatures, and the paper seemed to
The processing temperature is limited by the phase change of the
quartz. Above a certain
Brian
Is the behaviour the same when you insert a delay of around 1/2 or 1/4
the clock period in the sync line?
Alternatively can you invert the clock polarity?
A pity that the slope of the clock cannot be selected in the TADD-2.
Overdriving the sync input with a 5.8V signal may cause the input
:
Bruce, not sure just which clock you're talking about, but JP4 on the
TADD-2 allows you to select rising or falling edge for the sync pulse.
John
Bruce Griffiths said the following on 09/16/2009 06:18 PM:
Brian
Is the behaviour the same when you insert a delay of around 1/2 or 1/4
Chris Caudle wrote:
From: Mark Spencer mspencer12...@yahoo.ca
For anyone who is interested here is a bit more info about the USO's used
in deep space applications and some comments abou the crystal based USO's
I found it interesting that one of the limits of stability seems to be the
Bruce Griffiths wrote:
Chris Caudle wrote:
From: Mark Spencer mspencer12...@yahoo.ca
For anyone who is interested here is a bit more info about the USO's used
in deep space applications and some comments abou the crystal based USO's
I found it interesting that one
Magnus Danielson wrote:
Mike S wrote:
At 01:49 AM 9/13/2009, Hal Murray wrote...
Time synchronization between spacecraft might take advantage of
pulsars, reducing the bandwidth used on inter-craft comm links. As
frequency sources, they are as good as Rb short term, and as good as
Cs long
Mike S wrote:
At 08:02 AM 9/13/2009, Magnus Danielson wrote...
Mike S wrote:
Time synchronization between spacecraft might take advantage of
pulsars, reducing the bandwidth used on inter-craft comm links. As
frequency sources, they are as good as Rb short term, and as good as
Cs long term.
Lux, Jim (337C) wrote:
On 9/13/09 10:03 AM, Hal Murray hmur...@megapathdsl.net wrote:
bruce.griffi...@xtra.co.nz said:
Adding a 210ft diameter antenna to the spacecraft just to detect a
sufficient number of pulsars is probably not an option.
Unless a multibeam phased
Hal Murray wrote:
If so, what's the mechanism?
I know that attenuation is frequency dependent due to skin effect but I can't
turn that into variable delays. Is there a magic term I should google for
and/or does anybody have a good URL?
Context is a memory from 20 years ago. I think it
Bruce Griffiths wrote:
Hal Murray wrote:
If so, what's the mechanism?
I know that attenuation is frequency dependent due to skin effect but I
can't
turn that into variable delays. Is there a magic term I should google for
and/or does anybody have a good URL?
Context is a memory
Bruce Griffiths wrote:
Bruce Griffiths wrote:
Hal Murray wrote:
If so, what's the mechanism?
I know that attenuation is frequency dependent due to skin effect but I
can't
turn that into variable delays. Is there a magic term I should google for
and/or does anybody have
Magnus Danielson wrote:
Bruce Griffiths wrote:
Bruce Griffiths wrote:
Bruce Griffiths wrote:
Hal Murray wrote:
If so, what's the mechanism?
I know that attenuation is frequency dependent due to skin effect
but I can't turn that into variable delays. Is there a magic term
I
WarrenS wrote:
tau expert's advice sought
Basically my question is that is the correct bandwidth to use when taking 1
sec and above tau data?
What I want to know is how to record raw 1 second phase data to use for
calculating 1 sec and above tau.
Should I including in the data the
The RTC mentioned definitely has a 1 sec time stamp granularity and I
can see no easy way of improving this as their is no 1Hz output signal
synchronised to the internal clock.
Whilst the 32.768kHz output is synchronous with the input to the clock
divider, this is of little help as there is no
WarrenS wrote:
It seems like you have given plenty of information for me to give you two
possible suggestion.
Here is an almost no extra cost solution, (just takes care and helps if you
have done it before)
Take a pretty standard xtral osc with EFC, buffer its output real good,
give it
resolution time stamp of the event.
Bruce
Bruce Griffiths wrote:
The RTC mentioned definitely has a 1 sec time stamp granularity and I
can see no easy way of improving this as their is no 1Hz output signal
synchronised to the internal clock.
Whilst the 32.768kHz output is synchronous
Mike Monett wrote:
John Miles jmi...@pop.net wrote:
That's an interesting answer. Can you explain what you mean by
faster digital noise analysis capabilities?
The 3048A is relatively cumbersome to use, compared to a modern
phase-noise test set with high dynamic range
Hal Murray wrote:
Actually, you can see this as a Shannon information channel, analog or
digital.
What sort of bandwidth do I need to run a PLL over a long link?
I assume it takes enough to cover all the sources of error:
drift in the master
drift in the local oscillator
drift
Neither the linear regulators nor the switching regulators in the 5328A have
any explicit current limiting circuitry other than that provided by the
pass transistor current gain and the limited current available from the
pass element driver.
The only protection against long term load faults is
Don
One potential problem with most USB sound cards is the preamp.
The gain of these is set by a front panel pot over a very wide range.
Consequently the preamp gain cannot be all that stable.
Unless these preamps can be bypassed they may limit the performance when
used for measurements.
Bruce
Ulrich
Looks like some kind of transit circle.
Bruce
Ulrich Bangert wrote:
Steve,
.They HAD to adopt common measurement system
of some kind, and they sure weren't going to use anything that the
English did!
So it was! However, the idea to make something completely new and
That particular method is vulnerable to RF pickup from within the PC.
The coax screen should be RF grounded at both ends.
Bruce
Christian Vogel wrote:
Hi Lux,
Syncing inexpensive cards is a real chore (and the only reason to be
thinking about using this in the first place is to keep the cost
to a lot of things. :-P
-- john, KE5FX
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]on
Behalf Of Bruce Griffiths
Sent: Friday, August 21, 2009 2:20 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts
Locating the zero crossing of the signal isnt the best approach.
If one uses some DSP the phase shifts between the 2 beat notes can be
measured without the sound card sampling frequency stability making a
significant contribution to the noise.
Lux, Jim (337C) wrote:
Wouldn't the cards need to be
Lux, Jim (337C) wrote:
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Mark Sims
Sent: Friday, August 21, 2009 3:06 PM
To: time-nuts@febo.com
Subject: [time-nuts] Using cheap sound cards for measurements
Just because the cards
Lux, Jim (337C) wrote:
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Bruce Griffiths
If the 2 signals are sampled at different times then there is
incomplete
cancellation of the phase noise of the offset oscillator
Tom Van Baak wrote:
Could you sync the sounds cards in software?
If you feed an external 1 PPS into the unused stereo channel of
each sound card, then you can solve both card-to-card phase
differences as well as card-to-card frequency differences with
simple software fitting after, or even
recommendations?
Thanks
Don
Bruce Griffiths
Tom Van Baak wrote:
Could you sync the sounds cards in software?
If you feed an external 1 PPS into the unused stereo channel of
each sound card, then you can solve both card-to-card phase
differences as well as card-to-card frequency
Gerhard Hoffmann wrote:
On Mon, 17 Aug 2009 23:18:58 +1200, you wrote:
1) Use 3 sources, S1, S2 and X.
2) Phase lock S1 in quadrature to X using a diode double balanced mixer
using a low bandwidth PLL.
3) Phase lock S2 in quadrature to X using a diode double balanced mixer
using a
Steve Rooke wrote:
2009/8/17 Bruce Griffiths bruce.griffi...@xtra.co.nz:
iov...@inwind.it wrote:
Please, how do time-nuts measure phase noise? What may be a minimal setup
whit recording capability?
Thanks,
Antonio I8IOV
A minimal setup for the classical method requires
iov...@inwind.it wrote:
On Mon, 17 Aug 2009 23:18:58 +1200 Bruce Griffiths wrote:
Steve Rooke wrote:
2009/8/17 Bruce Griffiths bruce.griffi...@xtra.co.nz:
iov...@inwind.it wrote:
Please, how do time-nuts measure phase noise? What may be a minimal setup
The mixer output is only sensitive to phase differences for small
deviations about 90 degrees phase difference between the 2 sources.
With unlocked sources AM noise also affects mixer output.
In order to measure phase noise without phase locking you need something
like a COSTAS receiver or
iov...@inwind.it wrote:
Please, how do time-nuts measure phase noise? What may be a minimal setup
whit recording capability?
Thanks,
Antonio I8IOV
A minimal setup for the classical method requires 2 frequency sources at
the same frequency one of which can be phase locked in quadrature
Brian Kirby wrote:
Anybody know where I can find a PDF of the HP 5065A rubidium frequency
standard ?
Brian Kirby KD4FM
There's one in the manuals section of Didier's site.
Bruce
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Hal Murray wrote:
My Panasonic VIC100 antenna had a few screws to hold the bottom to the
plastic cone top. The bottom had an o-ring seal that stuck a little
but was still pretty easy to slide the bottom from the top half.
Inside was a patch antenna on top of a pcb.
Thanks. I tried
Tom
Really?
What mechanism do you have in mind?
In practice the same effect is observed when the Earths magnetic field
is cancelled using a set (3 pairs) of Helmholtz coils (or equivalent) or
in a magnetically sheilded enclosure?
Bruce
Tom Duckworth wrote:
The orientation change is due more
Some caution is in order as some ferrites used in RF transformer coils
may be permanently altered by application of a strong magnetic filed.
Testing at lower fields first would be safer.
Setupo a pair of Helmholtz coils and excite them with low frequency AC
and look for associated sidebands in the
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