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
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
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.
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
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.
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 --
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
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
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
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
___
time-nuts mailing list -- time-nuts@febo.com
To
New England Area Ham - Electronic Flea Market *** DATES *** 2014 P 1
of 2
All events are Ham Radio/ Electronic related except ~_~
***
2014Contact
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
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
Paul Swed posted a working, mostly analog, design here maybe 6 months ago.
-John
=
Am Wed, 19 Feb 2014 22:45:56 -0800
schrieb Richard (Rick) Karlquist rich...@karlquist.com:
On 2/19/2014 9:10 PM, John Marvin wrote:
I guess my question is who has the right to grant exclusive
At least on the Atlantic coast, the WWVB signal levels jump all over the
place, certainly 40 dB and maybe more. If a receiver cannot deal w/ that
w/o losing lock, it's nearly useless.
OTOH, LORAN was always a whopping signal.
-John
Chuck thats easy. Because I could make it
for that in the fr front end actually.
Regards
Paul
On Thu, Feb 20, 2014 at 4:34 PM, J. Forster j...@quikus.com wrote:
At least on the Atlantic coast, the WWVB signal levels jump all over the
place, certainly 40 dB and maybe more. If a receiver cannot deal w/
that
w/o losing lock, it's nearly useless
Wouldn't that be nice!
They implement a new format which destroys much of the installed
infrastructure, then don't actually produce the 'better replacement'.
How very LORAN!
-John
==
It may be true that WWVB is sending out a new
format, but the receivers for it don't seem
You should not denigrate PhotoMultiplier tubes.
They are virtually perfect, almost noiseless, detectors. With the right
photocathode, they are capable of QEs 50%, spectral response from the VUV
to near IR, and dark counts 1 PPS, with maximum count rates 10 MPPS.
Thay can easily have current gains
, 2014 at 7:45 AM, J. Forster j...@quikus.com wrote:
You should not denigrate PhotoMultiplier tubes.
They are virtually perfect, almost noiseless, detectors. With the right
photocathode, they are capable of QEs 50%, spectral response from the
VUV
to near IR, and dark counts 1 PPS
IMO, the easiest way (non-destructive too!0 is with a high wattage iron or
250 W gun, solder wick or a solder sucker, and an X-Acto knife.
Start in the middle of one side. Heat the joint area and suck out as much
of the solder from the joint area as you can. Slip the knife in the joint
and pry
you want to make a smooth fillet. Eutectic solders have
a single melt temperature, with no slush zone, and as such they
are either fully melted, or not. They don't thicken and build
like non-eutectic solder (60/40)
-Chuck Harris
J. Forster wrote:
IMO, the easiest way (non-destructive too
MALWARE LINK.
-John
http://conseilax.u.info.bro.html
---=-=-=-=-=-=-=-=-=-=-=-=-=--
From: B Riches 1/29/2014 9:58:05 PM
___
time-nuts mailing list --
Corby,
I'd email or call mini-circuits.
-John
==
Hi,
Does anyone know where to find the primary inductance value for Mini
Circuits RF Transformers?
I need to know so I can pick one to resonate with a particular capacitor
at 5Mhz.
Thanks,
Corby
Can you say more about your application? What does your load look like?
What pulse shape? There are well-known solutiuons for most problems.
As Jim said, a lot depends on the energy you need per pulse. What works
for a few mJ will not work for MJ
BTW, SCRs probably switch a lot faster than
There are very fast pulsers, some in NIM, that use a charged coax line and
Hg relay to calibrate Pulse Height analyzers. The line length sets the
pulse length; the charging voltage, the pulse height.
-John
Years ago I had a cousin who ran a civilian calibration lab. For
Are only the amplitude and rep rate variable, or do you vary the width too?
-John
=
Many thanks to all for the nice tips.
I may narrow down by saying a few more specs as suggested.
The pulse would see a somehow unknown load but for a start I
was suggested to have my source
The server has appeared to be spastic at times, suddenly sending out a
burst of messages, some new, some old, interspersed by nothing.
YMMV,
-John
Hi,
seems to me that the server is OK but minimum activity from the people.
Rgds Ernie.
-Original Message-
in the third
picture. It's almost like it has something to do with the rubber strain
relief/enviro shield, but I dunno what.
Bob
From: J. Forster j...@quikus.com
To: Bob Stewart b...@evoria.net; Discussion of precise time and
frequency
measurement time-nuts
If you are using both wires of a two-pin connector the question is moot.
There are exquisitely detailed docs on connector assembly out there, both
from the manufacturers and agencies like NASA. They include everything
from tool settings, proper locators, to assembly torques.
IMO, unless you are
Is this a rebadged 5087A?
-John
10 MHz 6 output amps, 1 input amp. Matches 5061A Cs standard.
fs, contact me off list please.
Don
--
The power of accurate observation is commonly called cynicism by those
who have not got it.
-George Bernard Shaw
--
Dr. Don Latham AJ7LL
If the contacts are loose and individually extractable/insertable, the pin
is probably a dummy pin to substitute for the more expensive brass/gold
pins. This is so the rubber does not distorted over time.
-John
=
I got a GPS Source splitter recently and since my little Adafruit
like it's
probably pressure tight. You can see the blue plastic pin in the third
picture. It's almost like it has something to do with the rubber strain
relief/enviro shield, but I dunno what.
Bob
From: J. Forster j...@quikus.com
To: Bob Stewart b
Far more people are killed and injured every year by car crashes and
smoking than by all civilian incidents, or even atomic warfare, in
history.
-John
===
This quartz crystal accident is a canary in the coal mine that
demonstrates how poor safety and regulations often work
kill people? 100% of
people die from something. So we shouldn't try to keep from killing
bystanders because they are going to die anyway? Sounds a bit sociopathic
to me.
Doc
Sent from mobile
On Nov 26, 2013, at 7:34 AM, J. Forster j...@quikus.com wrote:
Far more people are killed
If the telescope on your transit can go to your lattitude, sight Polaris
and you're done after a simple calculation.
-John
Stephen -
[time-nuts] Crude Survey Technique
Thanks for describing your method. I am learning a lot. here is agovt web
site that will give
-hjik8EkgSf6TuXxtVqHxUF3zKzGrNZ_HFi=v...@mail.gmail.com
Content-Type: text/plain; charset=ISO-8859-1
On Friday, November 22, 2013, J. Forster wrote:
If the telescope on your transit can go to your lattitude, sight Polaris
and you're done after a simple calculation.
This is the simplest high-accuracy
For something that crude, I'd consider taking a sight on Polaris. If you
note the time and do the math, you can probably do better than your
bounds.
Also, there is almost certainly an app somewhere to do the math for you. I
think tha reeuction info was in Bowditch or the Nautical Almanac.
FWIW,
The INS has to be 'aligned' before takeoff.
Remember, the earth is spinning on an axis, and the INS's platform is
stable in Inertial space. If you know the INS is sitting on the ground
(or even deep in a mine shaft) it's just trig. Nothing external needed,
not even stars.
-John
FWIW, my Garmin Nuvie 40 (el cheapo) only takes moving maybe 10' to get a
rough compass direction. I doubt it has any gyro or accelerometers.
-John
===
Hi Neville:
Most low cost hand held and car GPS receivers can only display direction
based on changes in position.
While on
As I said before, the RA and Dec of Polaris is well known.
Spherical trig and the Siderial Time will give you the offset from the
true pole in Az and El.
With corrections for refraction, this is good to better than an arc-second.
-John
==
On Thu, Nov 21, 2013 at 12:45 PM,
, J. Forster j...@quikus.com wrote:
Looking quickly at the prints on the site, the isolation is provided by
the transformer, not the active circuitry. The transistors/op-amps are
just buffers for the output.
That means that the isolation is determined, for the most part, by the
transformer
Looking quickly at the prints on the site, the isolation is provided by
the transformer, not the active circuitry. The transistors/op-amps are
just buffers for the output.
That means that the isolation is determined, for the most part, by the
transformer design, so:
A bifilar wound torroid
What's the signal strength like?
-John
===
Oh that is indeed interesting that they are moving forward.
The GRI is 89700.
SRS700 locked and looking good.
Just brought the Austron 2100 and 2100F on line.
The 2100 is tied to the local RB and the f is tied to the HP3801.
The SRS700
From another list:
http://www.youtube.com/watch?v=9CpsPgXyIm8
-John
===
___
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.
FORWARDED:
Sorry, I could not resist!!
73,
Billl, WA2DVU
Cape May
---
WWVB has been sold to Clear Channel
http://www.lownoiserecords.com/wwv_the_tick.html
-
-John
===
___
time-nuts
On spacecraft hardware, even though something is a bit old, it does make
sense to use it.
Space qualifying a piece of hardware is very, very expensive, because it
requires a lot of shake and bake plus thermal vaccuum and other things.
Furthermore, there are always unknowns.
Do YOU really want
What did you expect? It's the Washington Monument strategy... again. Just
like the 'sequester'.
When you take a lollypop away from a kid, it kicks and screams and tries
to make as much fuss as possible. Sometimes, just letting the kicking and
screaming go on is the best way to teach a badly
. Re: NIST off-line (Jim Lux)
6. Re: NIST off-line (Brooke Clarke)
7. Re: NIST off-line (J. Forster)
8. Re: NIST off-line (Tom Van Baak)
9. Re: NIST off-line (Alan Melia)
--
Message: 1
Date: Tue, 01 Oct 2013 13
There really is no such thing as a 'bright' pulsar. They are something
like 16 Mag at best. This is not exactly naked eye.
-John
===
b...@evoria.net said:
Just to satisfy my curiosity: what's easiest to detect galactic pulse
emitter (regardless of type), and what's the
A couple of points:
Pulsars are pretty faint and the only solution to that is antenna
aperture. We looked at that while doing SETI a ways back. Receivers are
now quite close to the theoretical limit as far as noise temperatuse.
There is very little room for improvement.
Pulsars are not
Yes, but to use them for interstellar navigation, as suggested, when the
propagation delays are 10,000 years or more complicates things.
What is contemplated is comparing the clocks, as they were thousands of
years ago, where they were thousands of years ago, with largely unknown
motions. You
From what I remember, with the 1000' Aricebo dish and pretty good LNA,
there were a literal handful of RF photons per pulse... less than 10
maybe.
-John
===
Just to satisfy my curiosity: what's easiest to detect galactic pulse
emitter (regardless of type), and what's the
The sune is hugely bright in the RF.
I've been able to see it at 2.2 GHz with nothing more than a horn a foot
or so across and a receiver w/ a NF of maybe 8 dB (cavity preselector
mixer IFA... ACL SR-209).
There was a noticable difference between pointing at the sun and in
another direction.
It is hard to imagine a more stupid or more dangerous way of making
decisions than by putting those decisions in the hands of people who pay
no price for being wrong. - Thomas Sowell
YMMV,
-John
===
Was it not always so?? Remember the politicians pay the bills not the
FYI:
http://thunderstorm.vaisala.com/explorer.html
-John
===
___
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.
The trend to add more and more fearures to electronic gadgets is a real
pain, IMO.
I have a Garmin Nuvi and you basically have to do a royal flush of every
stored parameter to simply clear the 'trail of bread crumbs'.
The thing has so many modes that it is really annoying to use and there
seems
I wish there were a way of blocking all Chinese ISPs. I'm sick of Dr Oz
and similar incessant crap.
YMMV,
-John
=
Hi
I run the same sort of stuff, and have the same sort of problems from time
to time. At one point all of Germany was unable to send me email
Bob
On Aug
If you mean Comcast, I can well see their point.
Over half the malware spam I get comes from Comcast and Comcastbussiness.
Just because they are big, does not mean they should be given an exemption
from being responsible.
YMMV,
-John
I agree with John, you can't go around
This chatter about model aircraft GPS got me to wondering if there now
off-the-shelf flight control systems for model planes that will do nav
and/or attitude control? I know there are mini-gyros, but I think they are
only good enough for attitude control.
Last time I was into this, if you lost
, 2013 at 10:14 AM, J. Forster j...@quikus.com wrote:
This chatter about model aircraft GPS got me to wondering if there now
off-the-shelf flight control systems for model planes that will do nav
and/or attitude control? I know there are mini-gyros, but I think they
are
only good enough
Has anyone played with this thing?
http://microsat.com.pl/product_info.php?products_id=35
If you add a laptop, is the thing a complete radio? It seems to be far too
cheap to believe.
-John
===
___
time-nuts mailing list --
OK. Thanks everybody. Can you please reccomend a make/model?
I'd like something like:
75 to 1300 MHz
USB
Ability to function as a crude SA.
Not crawling w/ birdies or aliasing issues.
Will run on Win XP.
Demod selecttable for all modes at all frequencies.
In a package, rather than a loose PCB.
remember.
http://www.funcubedongle.com/
On 8/5/2013 5:52 PM, J. Forster wrote:
OK. Thanks everybody. Can you please reccomend a make/model?
I'd like something like:
75 to 1300 MHz
USB
Ability to function as a crude SA.
Not crawling w/ birdies or aliasing issues.
Will run on Win XP.
Demod
I assume you mean XP?
Several reasons:
Used Thinkpads that will run XP are cheap and plentiful.
I hate Vista and Win 7...
I'm interested in a turnkey tool, not SW 'elegance', etc.
-John
==
On Mon, Aug 5, 2013 at 2:52 PM, J. Forster j...@quikus.com wrote:
OK. Thanks everybody
other than an FM radio. If I had a B-L adapter I'd be able to check some
samples from my Tracking Generator, but it's not something I've ever
looked into. Look on ebay for rtl2832 to find out what's most readily
available
Bob
From: J. Forster j
Hi John,
I don't think you quite got it yet. All of those types of Dongles
have no frontend filtering and no gain control (AGC).
Oh, I'm all too familiar w/ SAs without YIG preselectors. That's why I've
always preferred AILtech to HP.
Basically it is a
diode (so to speak) looking at the
About $100.
-John
=
On 08/05/2013 04:56 PM, J. Forster wrote:
Has anyone played with this thing?
http://microsat.com.pl/product_info.php?products_id=35
If you add a laptop, is the thing a complete radio? It seems to be far
too
cheap to believe.
-John
In looking around the local Radio Shack a few days ago, I notices a silver
dollar sized GPS module w/ patch antenna for use in home brew robots. The
thing is supposedly good to 5 Meters and costs about $55. It appears to
have a serial ASCII interface.
There is nothing obvious on the RS website.
). And this applies double to the
technological illiterates in DC
See Sen 'Tubes' Stevens for the canonical example
Sent from my iPhone
On Jul 29, 2013, at 12:46 PM, J. Forster j...@quikus.com wrote:
It seems to me that GPS has been oversold as the be all, end all system
that made all other systems
I think the largest concern about jamming is for civilian uses, rather
than military, mainly because military receivers are designed and built to
be more immune. Also, military systems are far more likely to have good
grade INS.
Furthermore, there are probably a couple of orders of magnitude more
--
Message: 1
Date: Sun, 28 Jul 2013 15:24:30 -0700 (PDT)
From: J. Forster j...@quikus.com
Subject: Re: [time-nuts] GPS Spoofing
I'm not so convinced about this:
OMEGA was the primary means of radio navigation, world wide, from 1976
to
1997. .
There was LORAN-C, after all.
And Omega
From what I've been told privately and off the record, the vacuum was not
filled with political gas.
YMMV,
-John
=
[snip]
Indeed, all of this was gone over *many* times in the 80's. Those involved
were *very* knowledgeable about all of these systems and their weaknesses.
None
Oops:
From what I've been told privately and off the record, the vacuum was not
a vacuum, but was filled with political gas.
Sorry,
-John
==
From what I've been told privately and off the record, the vacuum was not
filled with political gas.
YMMV,
-John
=
Prohibition never works. It's been tried with booze, drugs, pay sex, and
guns, at least, and failed every time.
If people want something badly enough, they will get it.
Ask yourself, is the collateral damage worth it?
MMV,
-John
=
We've been discussing both GNSS
It seems to me that GPS has been oversold as the be all, end all system
that made all other systems obsolete and GPS has become all but an
indespensible utility.
Reports like this, could well be used to promote a backup, like LORAN or
eLORAN, just as public buildings have backup generators.
The point about the duty cycle being low is correct. And, there are
commercial linear power amps, like the used ones made by ENI and others,
that can easily put out 1 kW plus narrow pulses.
Furthermore, the pulse generator is trivial to make with a Rb, 3 or more
Tektronix DD501s, a simple OR gate
...
Rob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of J. Forster
Sent: 28 July 2013 20:06
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] GPS Spoofing
The point about the duty cycle being low
efficient antenna and 100 kHz in the same sentence.
Oh, wait...
- Original Message - From: J. Forster j...@quikus.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Sunday, July 28, 2013 3:06 PM
Subject: Re: [time-nuts] GPS Spoofing
The point about
==
LORAN can be good to 60 ft.
On 7/27/13 12:21 AM, Jim Lux wrote:
On 7/26/13 8:45 PM, J. Forster wrote:
I gather from the article, the GPS position was spoofed and the
autopilot,
in bringing it back to where it was supposed to be, actually took it
off
course
turn it off thinking it
was
broken.
On Fri, Jul 26, 2013 at 8:41 AM, J. Forster j...@quikus.com wrote:
Prof. Humphry from Texas just reported being able to spoof GPS in
the
Med
and take over the nav system of a luxury yacht. He's done this
before
with
a drone in the US.
LORAN
and he'd very quickly turn it off thinking it was
broken.
On Fri, Jul 26, 2013 at 8:41 AM, J. Forster j...@quikus.com wrote:
Prof. Humphry from Texas just reported being able to spoof GPS in the
Med
and take over the nav system of a luxury yacht. He's done this before
with
a drone
to cross check
each
other.
Sent from my iPhone
On Jul 27, 2013, at 12:21 AM, Jim Lux jim...@earthlink.net wrote:
On 7/26/13 8:45 PM, J. Forster wrote:
I gather from the article, the GPS position was spoofed and the
autopilot,
in bringing it back to where it was supposed to be, actually
that works on the magnetic field component of
the incoming wave, rather than the electric field, like a whip. So, if
you put a bunch of turns inside the loop of conduit, a complete loop of
conduit will be a shorted secondary.
J. Forster
The HP 117A antenna is a circular shielded loop, about 1
Prof. Humphry from Texas just reported being able to spoof GPS in the Med
and take over the nav system of a luxury yacht. He's done this before with
a drone in the US.
LORAN as a backup, at least?
-John
==
___
time-nuts mailing list --
IMO, it is unlikely you will be able to form the loop by hand on a
mandrel. I'd suggest a commercial conduit bender for that trade size
conduit and work your way along the tubing a few inches at a time.
-John
===
Â
List,
Â
I bought one of them for several reasons besides
thinking it was
broken.
On Fri, Jul 26, 2013 at 8:41 AM, J. Forster j...@quikus.com wrote:
Prof. Humphry from Texas just reported being able to spoof GPS in the
Med
and take over the nav system of a luxury yacht. He's done this before
with
a drone in the US.
LORAN as a backup, at least
The HP 117A antenna is a circular shielded loop, about 1 meter or 3' in
diameter. I never bothered to measure it. It looks to be made out of
roughly 1 OD aluminum electrical conduit components, a Tee at the top and
a pull box at the bottom. There are three conduit sections, one a diameter
that
Do you have any idea of the transmitter power/antenna gain?
The relatively low power of the UK 60 kHz is strong enough to interfere w/
WWVB in MA, so I'm wondering if the UK eLORAN might be usably strong.
-John
===
Not the first time this has been mentioned but another
On a smaller scale, my two Austron 2100Fs are sitting, patiently waiting
Has anyone had success in the US locking a standard LORAN-C
receiver/antenna onto the European stations lately?
-John
=
I find this interesting.
The military is also rekindling an interest in HF
It's a compromise. NiCds are quiet, but they have to be recharged and can
have high self-discharge rates and grow whiskers internally.
If I were building a one-off or a few amps, and Hg batteries were
plentiful in the stockroom, I might well use them also.
In the PAR 113 the NiCd pack has to be
Yeah! In spades. And there really are no good substitutes. I have a number
of instruments from ESI, GR and others that are pretty much doorstops w/o
them.
The solution the camera people use, the silver cells, are not available in
the larger sizes for instruments AFAIK.
-John
===
Public perceptions of risk change with time.
In WWII, Radium dial watches, aircraft instruments, dial and switch
markings, were ubiquitous. But so were explosives, bombs, bayonettes, and
a bunch of other things. So people didn't have the luxury of concerns over
minor things.
Now that is not so.
1 - 100 of 1330 matches
Mail list logo
