Well, I used to be able to see LORAN pulses w/ a 3-inch diameter loop and
a Tek 7000-series 'scope.
WWVB is hard to detect w/ a 3-foot diameter HP shielded loop w/ integral
preamp 2 stages of mechanical filters. (HP 117A). The other half ogf the
time it was undetectable.
Paul S uses a loop that
500 GHz ? Really? How? Even counting 100 GHz is pushing it.
You mean MHz, no?
-John
==
Well if we are talking about $50 then you have my attention.
No I am not afraid to use a soldering iron. Amateur radio is not my main
interest here. I have the same compulsion many of
Carrier extraction by squareing does not work well at all in a high noise
environment. The BPSK limits the narowness of the IF BW.
If you rule out modelling the data stream, and phase switching the signal
before the IF, you have to go w/ something like a Costas Loop.
-John
=
I was monitoring WWVB against a good local standard and evaluating 60kHz
'seeing' 30 years ago. Sometimes it is beautifully quiet, after a storm
front went through as I remember, at other times it's absolute hash... to
the point that the HP 117A would not even hold lock.
-John
=
I doubt that a 'fractal antenna' is going to do very well at 60 kHz in a
size small enough to fit in a wrist watch.
YMMV,
-John
==
Google 'fractal antenna'. Fractal Antennas are a relatively recent (late
1980's to mid-1990's) discovery/invention. I have read that they are
You are about 1/4 the distance away. Inverse square law.
-John
===
On 2/21/14, 2:21 PM, Robert Roehrig wrote:
John Forster said:
WWVB is hard to detect w/ a 3-foot diameter HP shielded loop w/
integral
preamp 2 stages of mechanical filters. (HP 117A). The other half of
Paul,
Do you know if this is a prelude to continuous service?
-John
===
Wildwood will be on air from approximately 1400 on 02 March until 1400 on
04
March
Regards
Paul
WB8TSL
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To
New England Area Ham - Electronic Flea Market *** DATES *** 2014 P 1
of 2
All events are Ham Radio/ Electronic related except ~_~
***
2014Contact
Jim,
You were looking for a 0 Ohm resistor.
Sometimes HP did not, in fact, insert a 0 Ohm resistor component in later
revs of some PCBs. They just added the default 0 Ohmers in etch, between
two vias. Then, if someone wanted to open the link, the etch was cut. I
guess it saved a couple of
It depends on how accurately the bird can measure the round-trip time:
1 us = ca 500'
10 us = ca 1 mile
100us = ca 10 miles
1 ms = ca 100 miles
The arcs are loci of constant round trip time, projected on the globe.
-John
===
My question was on what would be the expected
I'm not so sure it is worth much as parts, except possibly on the black
market. I believe the aircraft industry is big on tracking every part,
cradle to grave. After all an under spec bolt can cause a very expensive
crash.
YMMV,
-John
==
In retrospect it is kind of crazy
According to a report on FOX, INMARSAT was able to determine the Malasia
Air followed the southern traectory from the Dopplar of the pings. They
verified their model by tracking other planes.
-John
=
___
time-nuts mailing list --
Yes, and there was an early military positioning system, roughly 1960s /
1970s that worked on Dopplar also. The name escapes me at the moment.
-John
=
This is how ELT locating satellites work (when not relaying the newer GPS
data bursts). Several on another list I watch
Could well be. I never saw the bird, of course. The portable ground
station was roughly the same size as an OD Manpak radio of the period and
read out Lat/Long on LED digital readouts. In retrospect, it may have been
in the early 1980s.
-John
==
Hi,
Yes, and there was an early
Certainly, if it's a bent-pipe repeater, that makes extracting the Dopplar
a whole lot easier. Furthermore, since it's unlikely that the missing
plane was the only signal, you can essentially do a differential Dopplar
measurement against other sorces, stationary or moving in a know
trajectory.
Original Message
Subject: [BARC-List] [Flea@MIT] New England Ham - Electronic Flea Market
Dates * April * update
From:New England Area Ham - Electronic Flea Market f...@mit.edu
Date:Thu, April 3, 2014 3:05 pm
To: f...@mit.edu
At resonance, an LC looks pure resistive.
For a parallel LC, sample the voltage across the LC and the drive current,
and tweek the frequency until they are in-phase.
For a series LC, sample the voltage across the L or C and tweek as above.
If you want to do it analog, dither the frequency a
That's why you want to look for the phase of the tank impedance. The phase
goes through zero at resonance. It is far more precise. The steepness of
the phase v. frequency plot is steep w/ a high Q circuit... flatter w/ a
low Q tank. Either way, it does go through zero at resonance.
The phase v.
FWIW, the HP GPIB cards are only really useful with a complete HP system
that runs HP special software in a complete computer controlled
instrument.
If that is not your intent, get a NI or compatible card. It'll be far
easier in the long run.
YMMV,
-John
===
Hi,
I need
No. There is just a little rectangular quartz wafer. No plating.
In fact, post WWII, when many ham transmitters were 'rock bound' (ie:
crystal conteolled) it was common pratice to regrind mil surplus rystals
to move them into the ham banda.
Apparently, some were also etched using a cleanser
to the
government. Ammonium bi-flouride and water was the most common etchant in
that era. There are a number of papers about the whole deal in the FCS,
and many stories told by those who were part of the changes.
Bob
On Apr 21, 2014, at 10:10 AM, J. Forster j...@quikus.com wrote:
No. There is just
Although not applicable when you have burnt parts, the 115BRs have to be
started. They do not autostart by themselves.
Behind the front panel, near the top, are a pair of pushbuttons. You have
to apply power, turn the meter to 10 kHz and push the button to start the
first decade divider, then
Is there perhaps a hemisphere jumper for the sign of nulling fields?
-John
==
On 10/28/2012 01:13 AM, Chuck Harris wrote:
Two things come to mind:
1) is this the high performance tube? Perhaps it has a different
Zeeman frequency than the standard tube?
2) a non HP replacement
Try asking on the EIP_Microwave Yahoo Group.
Best,
-John
===
I've acquired an EIP 545A counter which seems to be in decent shape.
In reading through the service manual there is a reference to option 14,
a high resolution mode that increases gate time to 10 seconds.
As far
On the off-chance someone has this manual. Please reply direct to Nick.
-John
===
Original Message
Subject: [Milsurplus] Wanted - AN/URQ-10 manual
From:Nick England navy.ra...@gmail.com
Date:Thu, November 15, 2012
PayPal is pretty much a law unto itself. Basically, if you choose to
become involved with them, it's their bat, ball, glove, and ballpark. Your
only real alternative is to play another game.
Unfortunately, the younger generation of eBay sellers is convinced that
PayPal and plastic is the only
Tyhey used to. Have you asked them if they still do?
-John
=
I'm just amazed Aligent doesn't take credit cards directly. Paypal is for
small time players.
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Odd.
I would have expected anybody's PayPal limit would be lower than the
associated credit card limit.
Logically, one should be therefore able to get a PayPal account without a
credit card,.
-John
===
This is some of the communication between me and Agilent on eBay. I
think it is
current account.
Dave
On 17 November 2012 22:06, J. Forster j...@quikus.com wrote:
Odd.
I would have expected anybody's PayPal limit would be lower than the
associated credit card limit.
Logically, one should be therefore able to get a PayPal account without
a
credit card,.
-John
Not if you just walk into a bank and open an account with $100 cash.
My point is not fraud, but that PayPal is not safe.
-John
==
On 11/17/2012 4:37 PM, J. Forster wrote:
Perhaps. That opens the possibility of linking a PayPal account to a
bank
account, then zeroing the balance
? or an independent company entirely? My only and
last $.02!
Don L
J. Forster
It is Agilent - at least to the extent I can determine. Some reported
on another mailing list that when calling Agilent, they had been
advised to look on eBay for CertiPrime items from the seller
agilentused
All
If agilentused is selling stuff on eBay, might not the PayPal be an eBay
thing, rather than an Agilent thing?
Fer sure, eBay really, really pushes PayPal because they get an additional
cut of the transaction.
-John
==
On Nov 17, 2012, at 5:29 PM, David Kirkby
You don't ask, you don't get.
And, is 10 UKP really significant compared to what you've spent or lost?
Get to them, succinctly summarize, get a name, and then switch to email.
YMMV,
-John
===
On 18 November 2012 01:02, J. Forster j...@quikus.com wrote:
As I said, try calling
It depends on what you mean:
First off, the phase modulation renders many existing phase tracking
receivers useless. Period.
A few current receivers are immune to the PSK, but they do not 'use' the
PSK modulation, but they just ignore it.
My understanding is, the new modulation was designed
I believe they have a design that is working in silicon.
If so, that's a $ million or more head start. That, to me, is a monopoly
because any other entrant to the market would have to amortize that
expense.
Furthermore, there is the issue of patent suits, even if you can design
around their
You might want to ask on the EIP_Microwave Yahoo Group. EIP made some of
the best microwave counters ever.
-John
=
Wanted: microwave counter. Must go to at least 18 GHz.
For trade: HP 5335a. Working. HPIB, Enhanced HPIB triggering options,
etc.. Depending on unit cash can be
Generally, it should work most of the time, which is probably good enough
to discipline your local standard.
Obviously, you want it above any foil backed insulation. Generally, near
the ridge would be good, as ridges don't get that much snow cover.
I've had a handhelg Garmin lock up OK in a lab
There are ways to do it w/o drilling holes. Most all houses have vent
stacks for the plumbing, typically 3 or 4 inch cast iron or thick plastic.
You can clamp a couple of feet of pipe onto one of those and run the wire
to under an eve or through a gable end, adding a drip loop of course.
But, if
the attic and
allows for better reception
Sent from my iPhone
On Nov 25, 2012, at 10:15 PM, J. Forster j...@quikus.com wrote:
There are ways to do it w/o drilling holes. Most all houses have vent
stacks for the plumbing, typically 3 or 4 inch cast iron or thick
plastic.
You can clamp a couple
Have you contacted ArtekMedia for any manual information?
Also, have you checked/posted a question to the VNA Agilent Forum?
-John
==
I've got an HP 8720D VNA. This has been out of support from Agilent
for 8 years, so its getting on a bit. There's a clock in the
instrument
You might better use RTV. I's plenty strong enough and can be taken apart
if needed.
-John
=
Unfortunately not, it's part of the molded bottom piece of the antenna
casing.
On 11/26/2012 9:24 PM, Chris Albertson wrote:
On Mon, Nov 26, 2012 at 5:51 PM, Peter Gottlieb
The first thing to do with any EIP counter is to remove and reseat all the
PCBs. The card sockets they use are sometimes flaky. Simply doing this
fixed most of the counters. This is especially true if they have been
storfed for a while.
YMMV,
-John
===
27/11/2012 14:18
It sounds like a SW limit, not hardware.
Silly question: Have you read the manual?
-John
=
29/11/2012 09:30
The replacement for the missing U6 chip arrived this morning and it
now completes the 200 MHz self test It will read up to the limit of my
frequency generator on Band
OK. It maybe time for the hair dryer and freeze spray. Also, try
re-seating any socketed chips.
-John
==
It sounds like a SW limit, not hardware.
Silly question: Have you read the manual?
-John
29/11/2012 15:31
Hi John, will re read the section on limits, but please see
IF, and it's a big IF, it is compatible with existing LORAC-C receivers,
it would be a most welcome development, and would mitigate to some extent
the idiotic decision to shut down LORAN-C.
If it's incompatible with the existing, installed receivers, because it
uses some kind of proprietary, sole
From Page 5:
The need to offer legacy LORAN-C system capabilityt for legacy LORAN-C is
not required in the US and
Does anybody who heard the test signal know for certain that the
modulation was that being proposed? Perhaps they were just testing a new
transmitter with the old modulation?
It
FYI, this is an archive of ROM EPROM dumps for various test gear.
-John
==
Original Message
Subject: [hp_agilent_equipment] Blue Feather File Archive Updated
From:Bruce Lane kyr...@bluefeathertech.com
Date:Sat,
Oops. It seems that Bruce's announcement is premature.
Best,
-John
FYI, this is an archive of ROM EPROM dumps for various test gear.
-John
==
Original Message
Subject: [hp_agilent_equipment] Blue
Yes. There is a Yahoo Group spwecifically about EIP products.
-John
I have an EIP counter with a problem, stashed, that I need to look at
eventually. So have been following the thread a bit.
If you guys get somewhere conclusive (or not), might be nice to post a
summary
-John
===attachment: Mayan.jpg___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
Over Christmas, I was chatting with a high accuracy clock researcher in
the UK and he mentioned a trip to Brighton on the Winter Solstice and saw
notices for this:
Burning the Clocks Festival.
http://en.wikipedia.org/wiki/Burning_the_Clocks
LoL.
-John
Most modern books on micriowave design (and probably Wiki) have the
basics. They are based on the NMR principle (Nuclear Magnetic Resonance).
This is the same physics used in MRI.
You might also look at old issues of the HP Journal or the Watkins-Johnson
house journal. The former is easily
It's an unfortunate fact of life. When a technology company grows, sooner
or later the MBAs, lawyers, and vulture capitalists take over and the
priorities get set by them and the quarter-over-quarter performance,
rather that the science or engineering.
I detest managers who believe that a person
For microscopes and all related topics, the Yahoo Microscope Group is very
knowledgeable. It has over 3500 members now.
-John
=
This is by definition Off Topic
I'm looking for a forum where people are about as technically
competent as here but where an amateur scientist
Trying to play with liquid acetylene is like juggling operating chainsaws.
-John
Il 2013-01-26 14:58 Bob Camp ha scritto:
Hi
Platinum RTD's are a pretty good bet for -80C, they hold up well down
there. For calibration, ammonia and acetylene both have triple points
in the
You can't be serious. Ammonia gas or liquid is dangerous.
You can buy calibrated RTDs or rent a quartz thermometer and stay alive.
YMMV,
-John
===
Hi
If the intent is to come up with a triple point cell to calibrate your
thermometer, acetone's triple point (at 178.5K) is a
The microscope group can help with reccomendations. 1000x is really
pushing it, because of 'empty magnification'.
Best,
-John
==
On Sat, Jan 26, 2013 at 10:00 AM, li...@lazygranch.com wrote:
If the intent is surface mount work, get an old BL Stereozoom 3. I'd
suggest
at 190K is going to have
something nasty about it.
Bob
On Jan 26, 2013, at 3:57 PM, J. Forster j...@quikus.com wrote:
You can't be serious. Ammonia gas or liquid is dangerous.
You can buy calibrated RTDs or rent a quartz thermometer and stay alive.
YMMV,
-John
===
Hi
The Yahoo Microscope Group already exists with over 3700 members world
wide, which forms a huge knowlege base, from biology to microelectronics.
http://tech.groups.yahoo.com/group/Microscope/
Why re-invent the wheel?
-John
==
I like the idea of a amateur microscopy nuts reflector.
. Ammonia also requires pressure vessels
and in pure form is incredibly corrosive
So unless you are trained in these techniques just don't even think about
doing this
Sent from my iPhone
On Jan 26, 2013, at 3:57 PM, J. Forster j...@quikus.com wrote:
You can't be serious. Ammonia gas or liquid
You might want to ask on the GenRad Yahoo Group. There is nothing in the
GR Historical Society CDs, as of te last version I have.
-John
===
Any schematics for the following general radio
Primary standard syncrometer clock
Girard 617 417 1766
jsimon1026 @aol.com
691c
690d
Folks,
As you have seen, the Group has been getting sammed lately. Most soams
never get posted to the Group, but some do. These apparently come from
hacked Yahoo email accounts.
Yahoo itself was hacked, and the passwords to about half a million Yahoo
email addresses were obtained.There are
Hmmm... . That puts a different face on it.
If it a LORAN-like signal, but with an eventual format, incompatible with
existing hardware, like the Austron 2100F, any cheering will have been in
vain.
YMMV,
-John
==
I understand its no eLORAN, but I keep calling it LORAN and
Great. Now if the transmissions continue and the format doesn't change!
-John
==
Boy LORAN austron2100 and 2100f and GPS HP3801are tracking really well.
The
Austrons are 1.5-2.0 E-12. Pretty much getting at there limits after 5
hours.
Regards
Paul.
On Mon, Feb 4, 2013
compared to my T'Bolt GPS/DO is -2.5E12.
Stan W1LE Cape Cod
On 2/4/2013 8:56 PM, paul swed wrote:
We can only dream. But will take what I can get for as long as I can
get
it. It sure in the heck kicks wwvb's capabilities.
Regards
Paul
On Mon, Feb 4, 2013 at 6:20 PM, J. Forster j
FYI, from another list. Contact OP directly, not me.
-John
===
Original Message
Subject: [TestEquipTrader] FTS-4060 Cesium Time and Frequency Standard
From:Chris Howard w0ep w...@w0ep.us
Date:Tue, February 19, 2013
Paul,
I doubt Patek makes ANYTHING a mere mortal would call 'cheap'.
YMMV,
-John
=
Actually I guess I do have a further comment. These Pateks look cheap
compared to the old hp5060 24 hour clock versions.
On Tue, Feb 19, 2013 at 1:23 PM, Brooke Clarke bro...@pacific.net wrote:
A desk clock is more like it.
-John
Totally agree. But the old HPs were a lot nicer looking for the $$
Still have not figured out how you would use one of those as a wrist
watch.
On Tue, Feb 19, 2013 at 5:12 PM, J. Forster j...@quikus.com wrote:
Paul,
I doubt Patek makes
So, if you use phase-tracking hardware, it's good for three more weeks.
Wonderful... not. :((
LORAN-C all over again!
-John
=
On Fri, Feb 22, 2013 at 06:01:46PM -0500, paul swed wrote:
Donald from what I have been seeing they are consistent.
But there is a 1 hour period
Hi,
I was just given an Anarobo Quartz writwatch, like this:
http://www.listia.com/auction/1183485-robot-watch-with-turquoise-blue-clock
Honestly, it is THE cutest trhing I've see in ages, and made of solid
stainless steel. Does anybody know anything more about it? Was it a promo
of some kind?
Where are you?
-John
===
Hi All;
I hear Loran C signals back on again, I'll fire up the SRS FS-700 and
check.
RP
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Have you tried to put BPSK through a narrow band filter and looked at the
envelope at the output?
-John
==
Hi
Also consider that some of these receivers use a narrowband crystal filter
in front of the IC. I doubt they spend a ton of money on the components,
so
that may not be
If a clock uses a narrow (high Q)filter, the BPSK may mess up the
amplitude response. The Time Code is modulated AM on the carrier.
If this is the case, broadening the filter, possibly by adding shunt
resistance, might fix the issue.
FWIW,
-John
On Wed, Mar 20, 2013 at
Unless you are very careful, LinkedIn harvests your address book and spams
everybody in it to join.
IMO, it's malware.
YMMV,
-John
Hello,
I am sorry for the email traffic that Linked-in has generated. Somehow it
picked up every email address in my email list.
My
Recently, my 'puter clock has been resetting back an hour every so often.
The auto-sync to time.NIST.gov is the timeserver it uses.
Does that site change to Daylight time?
Does the Windows time site change to aylight time?
Tjanks,
-John
==
I think the date for the DST time change were altered some years ago,
hence the Win SW messes up. I keep the 'puter clock on local time for
convenience, and switch because eBay does. I am only concerned with
roughly accurate local time.
Best,
-John
===
Recently, my 'puter clock
Thank you.
My question is really does NIST time change to DST. I'm completely happy
with manually changing the time twice a year by hand. I'm trying to see if
disabling the auto-update fixes the problem. Resetting a clock is not
exactly a major task.
I have no interest in going to Vista or
do DST changes so I've never had
to deal with it - other than dealing with some WWVB clocks that don't
let you disable DST!
Ed
On 3/23/2013 11:02 AM, J. Forster wrote:
Thank you.
My question is really does NIST time change to DST. I'm completely happy
with manually changing the time twice
If you double left click on the clock; click on the Time Zone tab, there
is a check box for DST update on/off. Since the dates of DST have changed,
it does not work right.
Best,
-John
=
Hi all,
I am a new member, in St Pete, Florida. I noticed that last week, my XP
laptop had
Watch eBay for a small static inverter. I got an Abbott one for under $50.
It takes 28 VDC and puts out 115VAC 400 Hz.
-John
===
How about one of those 2kw car stereo amps with a 555 input tone ?
--- On Wed, 3/27/13, Bill Ezell w...@quackers.net wrote:
From: Bill Ezell
An appropriate (but small) Group already exists:
http://tech.groups.yahoo.com/group/Aerospace_Hardware_Collectors_Group/
-John
===
Yeah I'd join a gyro-nuts group. I have a shelf full of weird gyros, a
stable
platform, other gyro stuff. I made a little power supply to
It was almost certainly for powering a WWII vintage fluxgate compass system.
-John
==
I have a little dynamotor somewhere which makes 3 phase 400 Hz. Tiny
little
thing! Only puts out like 15 VA, and not very noisy either. IIRC is was
called
an Instrument inverter
On
My understanding is that you want to operate photodiodes with high reverse
bias for the best frequency response. The bias widens the space charge
layer, thereby reducing the capacitance of the device. The high electric
fields in the SCL region also sweeps the hole-electron pairs, produced by
is a 50 Ohm coax to a broadband amp w/ 50 Ohm input.
In the limit, the amp is put right at the detector and has near-zero input Z.
Best,
-John
=
On Sat, 30 Mar 2013 10:52:54 -0700 (PDT)
J. Forster j...@quikus.com wrote:
My understanding is that you want to operate photodiodes
I think that you should be able to take the signal right out of the
backbiased diode and run it straight into a microwave mixer w/ a fixed 7
GHz LO and frequency discrimitate the IF output from the mixer to generate
a control signal for your LASER.
In theory, if your LASERS were very, very, very
Hi,
As some of you may know, the Boston Marathon bombers killed an MIT Police
Officer about 100 yards from the site of the Sunday MIT Flea Market. MIT
is now shut down, for today at least.
One of the suspects is dead. Another is at large in Watertown close by.
The whole area is on 'lock-down'
http://w1mx.mit.edu/flea-at-mit
-John
==
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and follow the instructions there.
As you may know, some time ago, I acquired an all-but-mythical APN-9A
LORAN-A receiver/Indicator.
This is not the common APN-9 LORAN-A, but is a hybrid (analog/digital)
version built for the B-36 bomber. Very few were built and documentation
is just about non-existant.
I have been very
will be scanning it
eventually.
Best,
-John
===
On Sun, Apr 21, 2013 at 11:21:33AM -0700, J. Forster wrote:
As you may know, some time ago, I acquired an all-but-mythical
APN-9A LORAN-A receiver/Indicator.
This is not the common APN-9 LORAN-A, but is a hybrid
(analog/digital) version
Hi,
I recieved a very odd communication, apparently from eBay, this morning.
It is a request to contact Congress about sales taxes on internet sales.
It APPEARS to be genuine, but I'm unconvinced.
Has anybody else received this email, and is it for real?
Puzzled,
-John
tell you in a heartbeat if the thing is
genuine or a malware attempt.
Keep the peace(es).
*** REPLY SEPARATOR ***
On 22-Apr-13 at 06:13 J. Forster wrote:
Hi,
I recieved a very odd communication, apparently from eBay, this morning.
It is a request to contact Congress
. Particularly, as it is being handled to push it
through so fast without the proper vetting.
BillWB6BNQ
J. Forster wrote:
Hi,
I recieved a very odd communication, apparently from eBay, this morning.
It is a request to contact Congress about sales taxes on internet sales.
It APPEARS
In message 54941.12.226.214.5.1366726922.squir...@popaccts.quikus.com,
J. Fo
rster writes:
It concerns me that eBays message FAILS the authentication test they
themselves advocate.
I think that is because this message does not come out of their
backoffice systems, but rather out of their
Peter,
I believe you are correct about the $1M per year trip point, but would
remind you that this is a very slippery slope.
When the Income Tax was originally enacted, very, very few were impacted.
That is no longer so.
The Alternative Minimum Tax was enacted to hit those who have saved and
Try www.ArtekMedia.com
Dave has IMO the best info on HP (and other) stuff available.
Best,
-John
==
Hello Folks!
I turn to you in hope someone can help me.
The old but good signal generator 8640B is by Agilent declared obsolete
and no support available.
The frequency
When I was building space payloads, every component had to meet or exceed
a VCM (Volitile Condensible Material) spec.
This was mainly of concern with plastics, like wire insulation (we used
Teflon and Kapton) but especially potting compounds.
And, don't even think about ball bearings near optics
Putting 100,000 items in space is a non-starter. The existing space trash
is already a big concern, and there have been seriuous proposals for
missions to clean it up. An iPhone, travelling at orbital velocity, has a
lot of kinetic energy!
There was an uproar years ago when the Westford Needles
Sometimes imaging sensors are just not available at wavelengths of
interest. There is no choice but mechanical scanners.
Bearings are also needed to de-spin antennas, etc.
-John
=
On Sat, 27 Apr 2013 12:06:45 -0700 (PDT), L. Forster wrote:
When I was building space payloads, every
Here is a start:
http://www.npl.co.uk/upload/pdf/9608%20-%20A0%20Poster2%20v4%20Final%20lr.pdf
-John
I'm asking mostly out of interest, because i have no clue how this
is done. Although i've read many papers on laser spectroscopy and
how to acheive even better atomic
I got this reply from a researcher friend:
A better link might be
http://www.npl.co.uk/science-technology/time-frequency/optical-frequency-standards-and-metrology/
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Date: Mon, 29 Apr 2013 06:11:15 -0700
Subject: Re: [time-nuts] laser locking
From: j...@quikus.com
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