This is a surprise:
in reality more than 90 percent of the users of GPS worldwide use it
primarily for a timing reference.
That makes the LORAN shutdown look even more idiotiuc!
-John
==
Copied from http://www.gpsworld.com/defense/gps-insights-april-2007-8428:
I
N. Korea jammed GPS signal in S. Korea, say reports The disruption
allegedly caused malfunction in mobile phones
SEOUL North Korea is responsible for the disruption of GPS signals in
some part of South Korea's capital region last week that caused
malfunctions in mobile phones, media reports
Capacitively couple a Varactor (or back biased diode) to the circuit and
vary the diode bias to tune.
-John
Hello all:
I've developed a need for pulling crystal oscillators built in to pll
circuits. These are cmos, and have the common style oscillator circuit
built in. The
I'm not so sure.
A filter ahead of a preamp significantly increases the system Noise
Temperature.
GPS signals are weak and link margins are small. The receiver preamps are
already very low noise.
I'd think that a narrow filter might well drive up the systen NF to the
point it'd be useless.
for me.
Regards
- Mike
Mike B. Feher, EOZ Inc.
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960 office
908-902-3831 cell
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of J. Forster
Sent: Friday, March 04, 2011 8:47 PM
-5960 office
908-902-3831 cell
-Original Message-
From: J. Forster [mailto:j...@quik.com]
Sent: Friday, March 04, 2011 9:09 PM
To: Mike Feher
Cc: 'Discussion of precise time and frequency measurement'
Subject: RE: [time-nuts] GPS Filter
Preamps with NFs under 0.5 dB are available
And the schematics? I've tried without success.
Repairing hardware w/o schematics is pretty tough.
-John
===
Regarding the SR620 counters, I must have missed something It
seems to me that SRS is providing about as much support as Tek or
Agilent. All three offer PDF manuals and
Look for a shorted Tantalum decoupling capacitor on the DC power line(s).
-John
=
hi
i recently bought a pts160. when first turned on, the 5v was pulled quite
low: 3v. after an hour or so, the condition cured, the 5v = 5.1v and
the
output matched the decades.
then, it
AFAIK there are no groups for that unit. AD-YU is pretty much an orphan,
although the meters are fairly common.
Try BAMA and Dave at ArtekMedia.
FWIW,
-John
===
AD-YU Electronics Precision Phase Meter Type 406L
Has anyone got an instruction manual or service manual?
I have the
From another list. The pics are really something!
-John
=
Original Message
Subject: [armyradios] OT: Photos of New Zealand earthquake
From:David McLendon k4bdj2...@gmail.com
Date:Fri, February 25, 2011 3:16 pm
That depends on the phase of the moon and your religion.
Sometimes low-ESR aluminum; other times good Tantalums (150D or CS-13s)
No two people agree on this issue.
-John
==
thanks everyone.
i found a cache of tantalum caps in the output amp module. also, there
isn't any
From another list,
-John
=
Original Message
Subject: Re: For Sale Ground station.
From:Rachel Tortolini dr.rtortol...@gmail.com
Date:Thu, February 24, 2011 8:07 pm
Stanford Research is a rip-off any way you turn. Their support ethic is
just crap.
YMMV,
-John
Hi guys,
need some help with a cal on my SR-620 counter.
In frequency measurement mode the unit always has an offset of up to
+/-2E-010 after auto-cal when feeding the same
The point is that SRS customer support is a sham. It might be OK for a
Fortune 100 customer or National Lab, but they clearly do not want or care
about support for anybody else.
If their attitude is screw you, I believe in returning the favor.
Companies like HP generally make most support
product lines they have something here and something else over there. Very
hard to train people on.
That's not to excuse any of this, it just is not a big surprise.
Bob
On Feb 23, 2011, at 8:13 PM, J. Forster wrote:
The point is that SRS customer support is a sham. It might be OK
to high costs and trouble on
the balance sheet.
Bob
On Feb 23, 2011, at 9:11 PM, J. Forster wrote:
Sorry Bob,
That does not wash.
They already have HC manuals with schematics.
Dave at ArtekMedia is small too. If he can scan a manual and put it
on-line for $25, so can SRS. And SRS probably
,
Laurence Motteram
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of J. Forster
Sent: Friday, 18 February 2011 8:11 AM
To: shali...@gmail.com; Discussion of precise time and frequency
measurement
Subject: Re: [time-nuts] SRS PRS10 problem
$12 inflation.
-John
=
hate say it.
Time for the $3 timex
On Thu, Feb 17, 2011 at 2:21 PM, Bill S w...@jbpet.com wrote:
As an aside to the watch repair business, a large number of brands
primarily Swiss, will no longer supply parts to watchmakers. This has
become
a big
I've had such blowoffs from SRS, simply asking for a schematic of an old
power supply. Uncooperative and unhelpful is a total understatement.
I will never buy any of their stuff again. I simply don't care if it is
the best in the world (which it is probably not the case), if the
documentation and
, not the pdfs).
Regards,
Laurence Motteram
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of J. Forster
Sent: Friday, 18 February 2011 8:11 AM
To: shali...@gmail.com; Discussion of precise time and frequency
measurement
Subject
AHA! The English system triumphs over that Metric nonsense.
My Rolex stopped working about 20 years ago. OTOH, my $12 Timex analog
quartz still works fine
I think. At least it was working when I misplaced it a year ago. Since
then, I've discovered I really don't need to know time to much
Well, isn't that just so SPECIAL!
I'm sure terrorists and other bad guys will comply fully. This makes about
as much sense as ECAP to stop snooping on cell calls.
YMMV,
-John
==
From a news release issued by the FCC today:
The FCC Enforcement Bureau today announced new
Artek is a very reliable and helpful outfit.
-John
==
Date: Sat, 5 Feb 2011 19:14:07 -0600
From: Dave M dgmin...@mediacombb.net
Subject: Re: [time-nuts] HP 654A Manual
To: time-nuts@febo.com
Message-ID: F5FA4565B87547A893E7D4EAC1AA1F83@D77M7BF1
Content-Type: text/plain;
Here is a contact in the Facebook abuse department:
Kirill Popov kpopo...@fb.com
-John
===
A good way to post photos etc is with Dropbox. You get 2 GB free. Once
you
install their small unobtrusive application, you can open the Dropbox
(online)
folder in Windows File
Try the following:
Agilent site
BAMA
ArtekMedia.com
-John
Greetings TimeNuts
Does anyone know where I can find a manual for a HP 654A Distortion
Analyzer.
Thanks for any help.
Gordon WA4FJC
___
time-nuts mailing list
Facebook SPAM is NOT APPRECIATED.
-John
=
Hi Time-nuts,
I set up a Facebook profile where I can post my pictures, videos and
events and I want to add you as a friend so you can see it. First, you
need to join Facebook! Once you join, you can also create your own
Facebook is obnoxious.
Yahoo Groups work quite well, if setup and moderated properly. I own
and/or moderate more than 20 of them with many thousands of members.
-John
Yeah, I've avoided facebook thus far and this is not going to be
sufficient to entice me. If you only post
Hal,
This is not the first time this has happened. Apparently, when you sign up
for FB there is some non-obvious (purposely misleading, IMO) opt-out step
that prevents FB access to your Address Book. The default is full access.
The spam message will be repeated several times in the next month or
Most GPS users care about position, not time.
-John
===
Chris wrote:
A notch filter can also be constructed to notch out the jammer if it
is out of band. A twin T design might be effective and low cost
Unfortunately, unless the interfering carrier is much too far away to
be
The heat capacity of an object is the Heat Capacity = M * Cp
M = Mass
Cp = Specific Heat (at constant pressure)
M = Vol * SG
SG = Specific Gravity ( = density/density of water)
So, Heat Capacity = Vol * SG * Cp
If you want to know how much heat is required to change tempo:
Heat = Vol * SG *
If you want the thermal mass to behave close to an isothermal body,
diffusivity is very important.
For example, a large mass of still water has high heat capacity, but poor
diffusivity. Much of the heat capacity is useless.
-John
==
At 04:18 PM 1/27/2011, J. Forster wrote
I got the Thermal Diffusivity definition upside down.
-John
=
At 05:33 PM 1/27/2011, J. Forster wrote...
If you want the thermal mass to behave close to an isothermal body,
diffusivity is very important.
For example, a large mass of still water has high heat capacity, but
poor
It strips paint real good too!
-John
==
Dishwasher and Calgon - Bob Pease reckons it works a treat to remove polar
contaminants.
Dave
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Ulrich Bangert
Sent: 19 January
The vials are commonly broken in vaccuo with a magnet and steel plunger.
-John
===
Hi Magnus,
From: Magnus Danielson mag...@rubidium.dyndns.org
As you can see on page 28 vials remains untouched till everythings are
in place
and else broken.
No, do read at page 27 first. There
What interested me was the beam collimator. I'd thought the beam would be
collimated and small diameter like a LASER, but the setup clearly is to
produve a beam of Cs maybe 1 to 1.5 inches in diameter.
-John
=
On 01/16/2011 04:38 PM, Jean-Louis Noel wrote:
Hi Magnus,
From:
I doubt the shipping issue is really problematic. The amount of Cs is so
small and so well contained it presents no real hazzard.
If you want to be on the safe side, pack the tubes really well and ship
them UPS or FedEx Ground.
FWIW,
-John
=
Greg-
I, for one would be very
Yes. If they are on a plane too long, the time will be off a bit. Einstein
predicted that and Bob Pound measured it. :)
Look, I suggested ground because virtually anything can be shipped that
way, up to and including BW and CW agents and nukes. A spec of Cs is not
an issue.
-John
. The pressure changes
are always something to consider.
I put a lot of camping gear in ammo cases. You can always tell which cases
seal because they are a bugger to open after a trip from the mountains.
--Original Message--
From: J. Forster
To: li...@lazygranch.com
Cc: Discussion of precise
Apparently, some of the earlier SS LORAN simulators were capable of
simulating both LORAN-A and LORAN-C.
If anybody has the manual for such a unit, please email me off-list. I'd
very much like a scan of the output stage schematic for the LORAN-A
function.
Thanks,
-John
===
In your dreams.
There was a very nice HP Cs there a few years ago, but it had a properety
tag that I recognized. I knew that unit had a known bad Cs tube, as I seen
it at a company surplus sale a month before, but that didn't stop the guy
hawking it as working for well over $5K.
Caveat Emptor!!
Tang was a WMD (Weapon of Massive Disgust) in and of itself.
-John
On Jan 14, 2011, at 1:45 PM, Bob Camp li...@rtty.us wrote:
Hi
Well that crosses off any discussion of Tang as a breakfast drink
(You would indeed need to be fairly old to remember the TV commercials
I used to perform Rb/Sr geochronology wet bench chemistry in
college. Rb-87 has a half-life on the order of ~48.8 billion years.
Several multiples of the estimated age of the universe. The
potassium-40 in your own body is a much greater threat, followed by
C-14, and various natural
As I said last go-round, I think the chances of rebuilding an HP Cs tube
are slim to none.
BUT, if you were really dedicated, I think you could build up the physics
package from pretty much standard stuff, like the Kimball Physics gun
parts and Conflat SS vacuum hardware, etc. Check Duniway.
than an H MASER, but
not by much. Certainly a Rb is easier.
-John
==
On 13/01/11 17:24, J. Forster wrote:
As I said last go-round, I think the chances of rebuilding an HP Cs tube
are slim to none.
BUT, if you were really dedicated, I think you could build up the
physics
package
or just use an existing vapor
container from an old unit. Of course if it was totally scratch built,
I'd
still just buy the right isotope.
-Bob
On Thu, Jan 13, 2011 at 4:18 PM, Rick Karlquist
rich...@karlquist.comwrote:
J. Forster wrote:
I'd imagine building a Cs unit might be a bit easier
Not to mention radio calcium in your bones.
-John
=
To start with, Rb-87 has a half-life of 4,88E+10 years with negative
beta-decay, i.e. an electron.
It has been judged very hard to accumulate any large amounts of it in
the body to build up to a unsafe dosage... you would pee
My glassblowing friends say that it's just a matter of getting
comfortable with the oxyhydrogen torch (with a colorless flame). If you
can work with Pyrex and a oxyPropane, it's easier. They all say that
this is a basic life skill that everyone should have. Yeah, sure.
There seems to be a
Magnus,
That's a very interesting paper. It has some interesting stuff on the
vacuum techniuque that's needed for Rb or more for Cs.
Do you know if anybody has actually built / is selling a Rb with a diode
light source, rather than the bulb?
Best,
-John
It seems like
John,
On 08/01/11 05:04, J. Forster wrote:
Magnus,
See my post of a few minutes ago.
The GRI and Delay counters need to be 5 decimal digits. My current
thinking is manual entry of the numbers via BCD coded thumbwheel
switches.
If you only need a static location that will be fine
Pondering some more on this, doing some calculations (spread-sheets) the
actual scheme emerge... the range of 0 to 7 is not selected by accident.
The base pulse repetition rate is 30 ms, 40 ms and 50 ms. The pulse
repetition rate modifiers modifies the repetition rate by -100 us per
step. It
Loran c was complicated by the fact that there were phase reversals in the
patterns that had to be emulated it doubled the size of the code. But to
answer your question John its all done in simple readable basic language.
Think of it as a endless loop pattern. The real trick is using a good
Paul, I see none on the prints. It may have been used on later receiver
designs.
Thanks,
-John
=
The goniometer that I remember was to allow a controlled phase change for
measurments. It was inside the rcvr.
___
time-nuts mailing
John,
On 08/01/11 16:08, J. Forster wrote:
Pondering some more on this, doing some calculations (spread-sheets) the
actual scheme emerge... the range of 0 to 7 is not selected by accident.
I had essentially the same spread sheet...
However, how would you be able to achieve simplicity
:08, J. Forster wrote:
Pondering some more on this, doing some calculations (spread-sheets)
the
actual scheme emerge... the range of 0 to 7 is not selected by
accident.
I had essentially the same spread sheet...
However, how would you be able to achieve simplicity of design by being
true
That's just about what I want to do.
Best,
-John
John,
Quoting J. Forster j...@quik.com:
The GRI and Delay counters need to be 5 decimal digits. My current
thinking is manual entry of the numbers via BCD coded thumbwheel
switches.
More than thirty years ago
I'm designing a simulator for LORAN-A... YES, LORAN-A. It needs about 24
different GRIs from roughly 50,000 uS to 30,000 uS. Rounded to integers,
the GRIs come out to something like 49,407 uS.
Does anybody have any simple ideas for generating such a signal. For
simplicity, I'd like to use a
Battleship Massachusetts has one, right near you.
-John
=
Loran A wow. That is indeed ancient. Did you find a old receiver or what
that you are tinkering with?
Regards
Paul
On Fri, Jan 7, 2011 at 5:28 PM, J. Forster j...@quik.com wrote:
I just got to thinking a few minutes
It's in the Chart Room. The ship is always looking for technical help, BTW.
Yes,
-John
===
I know it reasonably well. Though I don't think I ever saw that. But its a
heck of a ship.
Are you trying to hot it back up?
On Fri, Jan 7, 2011 at 5:37 PM, J. Forster j...@quik.com
I'm looking at building a LORAN-A simulator to run a vintage display.
I used to design stuff with gates and counters by hand, and can still do
so, but it's tedious.
Does anyboby know of any freeware that can be used to draw up logic and
simulate its operation, including propagation delays? I
.
Currently I plan only one Slave, but a second would be an easy addition.
-John
==
On 08/01/11 03:28, J. Forster wrote:
I'm looking at building a LORAN-A simulator to run a vintage display.
Hmm. Generating blips programmed in repetition rate and delay as steps
of a 10 MHz clock
...@rubidium.dyndns.org wrote:
On 08/01/11 03:28, J. Forster wrote:
I'm looking at building a LORAN-A simulator to run a vintage display.
Hmm. Generating blips programmed in repetition rate and delay as steps
of a
10 MHz clock should be sufficient and fairly straight forward. A lower
clock
It's OMEGA not LORAN. Try FairRadio or Google for it. OMEGA was in the
10-25 KHz region. LORAN-C was 100 KHz. WWVB is 60 KHz.
You might be better off starting from scratch.
Best,
-John
===
Subject: Looking for Tracor 599 VLF Receiver Manual
I have acquired a Tracor Series 599
Negative lens and microscope objwective.
-John
===
I want to get light from a wide angle (30 degrees or so) into a multimode
fiber cable to feed a fast MF466 photodiode for short distance sensing.
That fiber is really small to focus on. Anyone done this...looking at a
Yes and MultiChannel Analyzers too. Not to mention NIM and CAMAC.
-John
=
Ahem. Some of us collect *scintillation counters*. [?]
Anybody have a working cesium fountain?
On Mon, Jan 3, 2011 at 2:08 PM, Robert Atkinson
robert8...@yahoo.co.ukwrote:
Hi Antonio,
Time
My concern is a major industrril building complex and all the visitors
that get missdirected to the wrong end of a long road every day.
-John
===
Maybe we should cut these cartographers a little slack. When you consider
that Garmin will sell you a map update of the entire
Well, I won't rant back at you, Dick, but your expectations are way off
base. GPS cartographers have to designate billions (yes, billions) of
addresses and the fact that they miss a few scarcely justifies a backhand
brushoff as shoddy work.
Look at it another way:
They are producing one
Not only MS. Any product whose cost ofd production is trivial compared to
selling price.
Look at Coke... it's 99+% water. In some places it sells for $2/pint.
-John
==
Hmmm, sounds like the Microsoft model.
What did you expect for $100?
On 12/31/2010 12:49 PM, J. Forster
HNY,
I disagree. The reason a high performance GPS costs 100K or more is that
the engineering cost is ammortized over a few hundred units.
Say the thing cost $10M to develop and you make 1000, that's $10,000 NRE
per unit.
However, if you have a successful commercial unit and sell 1,000,000 the
Did you ever actually get a contact inside Garmin?
I have the same problem. If you punch in an address, it sends you to the
wrong end of a long road.
I've been told there are two mapping companies. Anybody know who they are?
-John
===
Hey John,
I had the same prob with my Nuvi.
On the noise source, make a roughly 1 foor diameter shielded loop and use
it to DF the source, either with a portable receiver or preamp, BPF, and
'scope.
A shielded current probe, made of a long, skinny rectangle is useful for
looking for EMI currents on conductors.
When yuou find the source,
I remember reading somewhere that the envelope of the LORAN pulses was
shaped to reduce the transmitted BW.
Does anybody have a reference for that, and relatedly, what does the BW of
the antenna have to be? Typically, loops are about 90 KHz to 110 KHz, but
can that be narrowed down?
Best,
-John
I was more interested in reducing the BW, rather than increasing it.
Years ago, I bought up some of the resuidual of Appelco, a New Hampshire
LORAN company that made units for Raytheon. Included were a bunch of
active tunable filters, designed to tune out interference. However,
there is no
but if you do then you
will have to pick a date for when it was correct and then explain
how it could be incorrect before that date.
On Mon, Dec 20, 2010 at 7:07 AM, paul swed paulsw...@gmail.com wrote:
Indeed. But thats the way it goes.
On Sun, Dec 19, 2010 at 12:52 PM, J. Forster j...@quik.com
how it could be incorrect before that date.
On Mon, Dec 20, 2010 at 7:07 AM, paul swed wrote:
Indeed. But thats the way it goes.
On Sun, Dec 19, 2010 at 12:52 PM, J. Forster wrote:
There ain't no such thing as Loran. It's LORAN, just like RADAR.
They are BOTH
Correxct, I believe.
There is a little known story about the cavity magnetron:
The one Tizzard brought over was machined out of a solid block of copper.
Copper is a horror to machine kinda like cheese. A machinist was
lucky to get any yield.
It was brought to the Raytheon labs and Percy
There ain't no such thing as Loran. It's LORAN, just like RADAR.
They are BOTH acronyms.
-John
=
There never was a Loran receiver with a keypad. I am certain he meant
Loran C. Loran is (was) the common name for the service... But then,
you already knew that, and were just
There was a thread about such a chip a few months ago, I think.
-John
I am looking for a commercial drop-in module/solution of a
time-to-analog or even time-to-digital converter module with = 1 ps
resolution (device should eventually go on a printed-circuit board).
???
Both my Austron 2100Fs have Austron loops.
-John
Hi
It's been a long time since I've tried this, but the Iceland chain was a
reasonable catch from the central US with an Austron 2100 and the standard
supplied whip antenna. Reception was ok at night and useless during
1. It is unclear whether they actually bought the rights from the real
owner who actually had clear title, or just a pile of HC manuals.
2. If they do not have clear title to the manuals, any copyrights to the
scanned version is invalid. They can only copyright new material they have
added.
Ask Dave at ArtekMedia. His manuals have indices in the .pdfs. They might
be automatically done, which implies OCR.
FWIW,
-John
You obviously haven't come across all of the Adobe acrobat OCR'd manuals
on logsa. They are amazingly unusable. The OCR program gets way off
I was a long thread on the Boatanchors, ArmyRadios, or Milsurplus list.
Probably on the Heathkit list also.
-John
==
Chuck,
Really ? Which little ham company is that ?
BillWB6BNQ
Chuck Harris wrote:
You obviously haven't come across all of the Adobe acrobat OCR'd
There was a lot of discussion about whether the company actually bought
the rights and/or whether the seller, in fact, owned the rights, , or just
some filing cabinets of hard copy manuals.
FWIW,
-John
Press Release
October 2008
Data Professionals of Pleasanton
GPS surveying relative to astronomical reference? I don't think so.
-John
==
b...@lysator.liu.se wrote:
When you start getting to less than a meter.. For absolute, you need to
start worrying about stuff like solid earth tides, plate movement, a
whole
host of things are all
It all depends on what your goal is. A couple of Hertz at 10 MHz will
keep you well within any of the HF ham bands.
The following addresses beyond the 'Gotta stay in the band' issue.
The problem with the Zero-beat-WWB-at-10-MHz technique is that WWB is
changing frequency. Not at the
Have you checked what Dave at ArtekMedia has? He does really good work and
sells his scans pretty cheaply.
FWIW, if Dave has it, you'd be better off working at McDonalds than
redoing it. Just my $0.02 worth.
YMMV,
-John
===
Hi all,
I've been lucky enough to get a 3586A in
I have offices in a building with a bunch of doctor's. They throw them out
also, because of vaccines. Pediatricians and 'flu season are good bets.
-John
==
Hello, Time-Nutters--
I have found that the styrofoam containers used to
ship frozen (or just very temperature
WWV is not a very good option. The signal fades a lot and has HF noise
issues unless you have a really good location within ground wave. Carrier
tracking is likely hard, which means you have to deal with the 1 PPS pips.
I've used a digital averaging scope, triggered by the 1 PPS from my local
The two (before and after ?) pics look like they have different contrast
settings.
-John
===
In message 013e01cb8dc6$41b038a0$4001a...@lark, Alan Melia writes:
I believe there is a reflective/foam insulator that is sold for setting
behind (what we in UK call ) CH radiators when the
You could probably buy enough pink fiberglass to insulate a house for what
one of those cost. They might even cost more on eBay
-John
===
How about surplus HRSI tiles off the Shuttle?
On Sat, Nov 27, 2010 at 1:47 PM, Poul-Henning Kamp
p...@phk.freebsd.dkwrote:
In message
Thermos flasks were pretty common on early crystal oscillatots, including
GR, HP 107(?), and Sultzer at least.
-John
In an attempt to educate myself about temperature stability, I put a
temperature sensor in a 1 cube of brass wrapped in plastic packing-type
bubble wrap, and
Joe,
You are bust greasing an already slippery slope. :)
-John
==
Eugene,
Welcome to the list and beware of how 'addicting' this can be. I started
out with your exact same purpose, minus all the equipment you have, and am
still a 'newbie'.
First question is do you
Worse. Those books will start you thinking about home brew H MASERS. T^hey
make UHV seem doable.
-John
===
John Strong's Procedures in Experimental Physics has a section on
thermal design (for furnaces and ovens), and is worth having a copy of.'
Moore, et.al., building
Certainly in the 1 in 10E9 region a scope is fine.
Set the scope to trigger on the 1 PPS and look at your local 10 MHz at 10
or 20 nS/div. A storage or DSO scope makes this pretty easy. You can tweek
your local osc pretty quickly this way. At 10 nS/div a 1 in 10E9 walks 1
div in ten seconds.
That's what those golden thermal blankets are on spacecraft and in
cryostats. I'm not quite sure whether the golden color comes from a
deposited film of Au, or whether it's color comes from the Mylar. It's
more likely the former. I've seen the stuff up close, but have not worked
wit it personally.
Ahh. Very interesting explanation. So is it somewhat correct to assume
(yes,
I know) that for a stationary (non-mobile) environment, these extra sats
dont make much difference? This seems to be what the explanation is
saying.
Pretty much, although if your view of the satellites is obscured
Aren't the space blankets use in survival packs pretty much the same
stuff? The mylar-air space-mylar construction seems pretty rational, and
they are windproof.
-John
===
Hal Murray wrote:
namic...@gmail.com said:
Find some closed cell polyethylene that is quite thin and some
leaf and the spacer material just take care of the IR
part of the equation without adding a lot of conductivity.
Bob
On Nov 26, 2010, at 5:43 PM, J. Forster wrote:
That's what those golden thermal blankets are on spacecraft and in
cryostats. I'm not quite sure whether the golden color
Some of the older GPSs had the 9 pin COM port connectors to interface with
the mapping SW running on a PC laptop (Magellen or Garmin ?). Might that
data stream contain good enough timing info? I don't knoe what protrocol
they used.
-John
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Hi Bill:
The telescope has around arc
I'm virtually certain by 1968 they were using some plastic film. Maybe
Mylar, maybe Kapton, but metalized plastic. I was doing optics and
telemetry so was not really involved in other areas, but I babysat our
payload on that bird first bird for 5 months
-John
Bob Camp wrote:
Hi
Agreed. The trick is to properly partition what is done in hardware ane
what is done in software. This could eliminate a lot of logic hardware.
Clearly, the RF stuff and modulator are hardware.
Ditto PR code generation.
Everything else in SW, I think.
FWIW,
-John
===
Hi
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