E
Ed
Guest
isn't the use of a marker on the outside to defeat one method of copy
protection ?
--
refillable drysuit talc bag $9.95 ppd
http://www.underwaterusa.com
protection ?
--
refillable drysuit talc bag $9.95 ppd
http://www.underwaterusa.com
A
Alan McClure
Guest
jriegle wrote:
ARM
R
Richard Henry
Guest
"Roy McCammon" <rbmccammon@mmm.com> wrote in message
news:40A38A38.7030807@mmm.com...
a good acronym) which was originally C130s equippped with a long-wire
antenna on a reel and an ELF transmitter. Two aircraft were supposed to be
on station at all times, one Atlantic and one Pacific, flying in shifts, so
all ballistic misslile subs cold be contacted instantly.
news:40A38A38.7030807@mmm.com...
The Navy has a program called TACAMO (TA Charge And Move Out - anything for
a good acronym) which was originally C130s equippped with a long-wire
antenna on a reel and an ELF transmitter. Two aircraft were supposed to be
on station at all times, one Atlantic and one Pacific, flying in shifts, so
all ballistic misslile subs cold be contacted instantly.
D
DarkMatter
Guest
On Tue, 11 May 2004 10:59:28 -0500, "Ron H." <ronharshbarger@mmm.com>
Gave us:
At high power, it is a bulk resistor. The dimensions of the cavity
would help.
Gave us:
It will act as a resistor. At low power, perhaps a bit different.
At high power, it is a bulk resistor. The dimensions of the cavity
would help.
D
DarkMatter
Guest
On Tue, 11 May 2004 14:29:31 -0500, crusty@usa.net Gave us:
resistor.
D
DarkMatter
Guest
On Wed, 12 May 2004 04:36:27 GMT, "The other John Smith"
<jocjo-john@yooha.com> Gave us:
I takes a long time to get 1kbyte across.
<jocjo-john@yooha.com> Gave us:
I takes a long time to get 1kbyte across.
D
DarkMatter
Guest
On Tue, 11 May 2004 23:34:01 -0700, "Max Hauser"
<maxREMOVE@THIStdl.com> Gave us:
I mean it allows for so much more *use* of the signal as it is being
sent.
Anyway, this is party why one can get so many more channels per
transponder on a comm bird than was available in the past. That 6MHz
wide channel is being filled to the brim with data (and that data
compressed as well), as opposed to the signals they repeated in the
60s and 70s.
Thank God for General Instrument (now a division of Motorola).
They (along with others) brought you wide screen form factors,
MPEG-2, and HDTV. As well as twelve channel per carrier uplink
encoding and decoding. They made your Video/TV life over ten times
richer.
GI was not just another cable box maker.
Then the Cable Cos ream us up the ass with their pricing. All the
while letting their hardware age, and fester, instead of keeping up.
They call that "a good value service".
Cox's news server is one fine example. I'd be surprised if it is
even one terabyte in archive size.
<maxREMOVE@THIStdl.com> Gave us:
Is this why QAM 256 is far better than simple modulation schemes?
I mean it allows for so much more *use* of the signal as it is being
sent.
Anyway, this is party why one can get so many more channels per
transponder on a comm bird than was available in the past. That 6MHz
wide channel is being filled to the brim with data (and that data
compressed as well), as opposed to the signals they repeated in the
60s and 70s.
Thank God for General Instrument (now a division of Motorola).
They (along with others) brought you wide screen form factors,
MPEG-2, and HDTV. As well as twelve channel per carrier uplink
encoding and decoding. They made your Video/TV life over ten times
richer.
GI was not just another cable box maker.
Then the Cable Cos ream us up the ass with their pricing. All the
while letting their hardware age, and fester, instead of keeping up.
They call that "a good value service".
Cox's news server is one fine example. I'd be surprised if it is
even one terabyte in archive size.
D
DarkMatter
Guest
On Wed, 12 May 2004 07:47:15 GMT, Repeating Rifle
<SalmonEgg@sbcglobal.net> Gave us:
For a litz wire to give an advantage that is indeed audibly notable,
the base system needs to start at around $40k. Some dipshit's $5k or
10k "stereo" ain't gonna get it, and the $20k jobs can barely make the
difference any greater than negligible. It takes a truly knowledgable
person to quell acoustic demons at this level.
However, on said $40k system, the differences indeed do show
themselves, and make such purchases viable for such systems.
For Joe Blow's shitbox, however, they are a laugh. Monster laughs
all the way to the bank.
Tube amps have advantages for live performers, such as a bassist.
Since the days of FET driven, and module driven amplifiers, however,
even those guys would have a hard time telling the difference without
introducing high slew rate transients at the pickups in order to
"tell" what is driving the acoustic transducers (speakers). Those
amps have their place though.
Acoustics plays into electronics more than one may think.
Take HF cores and magnetics. Why do they sing when they are not
varnish impregnated? What do you think magnetostriction is?
It is a mechanical action, and therefore will have acoustical
resonances and interplay. A flyback uses magnetic core saturation as
the resonant function for making an oscillation. Placing a clamp on an
E core will at some point of increased pressure, restrict it's flux
flow, and will be exhibited as heat, and electrical losses. At normal
pressures, it minimizes air gap, and maximizes efficiency in cases
where the gap is not an element of the circuit function, just
transformer efficiency.
Other HF transformers have operation which IS gap dependant, such as
PWM driven units which cause drivers to ring or clip if the gap is too
small, and are too lossy if it gets too big.
At human audible frequencies copper wire has no notable skin effect,
and skin effect itself is an effect of the e-field pushing the
electrons to the outside of the conductor, not any kind of acoustic
demon.
When there is a lot of time (long period), a lot (thickness) of
electrons flow near the surface. When the period is less, the same
number of electrons flow (for a given amperage) in a thickness (skin)
that is much closer to the surface of the conductor. So, the faster
the AC frequency, the lower the cross sectional thickness of a given
conductor gets used. This is why litz works so well at high
frequencies. All those presumably small "skins" add up to way more
cross sectional thickness for the purpose of actual flow than does a
single strand that matches the thickness of the entire litz bundle.
<SalmonEgg@sbcglobal.net> Gave us:
Let's just say that you have your eccentricities too.
For a litz wire to give an advantage that is indeed audibly notable,
the base system needs to start at around $40k. Some dipshit's $5k or
10k "stereo" ain't gonna get it, and the $20k jobs can barely make the
difference any greater than negligible. It takes a truly knowledgable
person to quell acoustic demons at this level.
However, on said $40k system, the differences indeed do show
themselves, and make such purchases viable for such systems.
For Joe Blow's shitbox, however, they are a laugh. Monster laughs
all the way to the bank.
Tube amps have advantages for live performers, such as a bassist.
Since the days of FET driven, and module driven amplifiers, however,
even those guys would have a hard time telling the difference without
introducing high slew rate transients at the pickups in order to
"tell" what is driving the acoustic transducers (speakers). Those
amps have their place though.
Acoustics plays into electronics more than one may think.
Take HF cores and magnetics. Why do they sing when they are not
varnish impregnated? What do you think magnetostriction is?
It is a mechanical action, and therefore will have acoustical
resonances and interplay. A flyback uses magnetic core saturation as
the resonant function for making an oscillation. Placing a clamp on an
E core will at some point of increased pressure, restrict it's flux
flow, and will be exhibited as heat, and electrical losses. At normal
pressures, it minimizes air gap, and maximizes efficiency in cases
where the gap is not an element of the circuit function, just
transformer efficiency.
Other HF transformers have operation which IS gap dependant, such as
PWM driven units which cause drivers to ring or clip if the gap is too
small, and are too lossy if it gets too big.
At human audible frequencies copper wire has no notable skin effect,
and skin effect itself is an effect of the e-field pushing the
electrons to the outside of the conductor, not any kind of acoustic
demon.
When there is a lot of time (long period), a lot (thickness) of
electrons flow near the surface. When the period is less, the same
number of electrons flow (for a given amperage) in a thickness (skin)
that is much closer to the surface of the conductor. So, the faster
the AC frequency, the lower the cross sectional thickness of a given
conductor gets used. This is why litz works so well at high
frequencies. All those presumably small "skins" add up to way more
cross sectional thickness for the purpose of actual flow than does a
single strand that matches the thickness of the entire litz bundle.
D
DarkMatter
Guest
On Wed, 12 May 2004 21:50:20 -0400, Boris Mohar
<borism_-void-_@sympatico.ca> Gave us:
It was supposed to make it sound better.
It was NOT about copy protected discs.
It was, and is BULLSHIT. Laser read head assemblies pick up
directly reflected "lands". That is the opposite of "pits", and is
quite bright bouncing back into the pickup for a "one" binary read.
The "pits", and all other extraneous reflections, such as the
friggin' scatter that is claimed to be reduced or negated by this
green Magic Marker technique, does NOT get read at all, so it is, and
has always been bullshit.
<borism_-void-_@sympatico.ca> Gave us:
That's not what the green MM's function was purported to be.
It was supposed to make it sound better.
It was NOT about copy protected discs.
It was, and is BULLSHIT. Laser read head assemblies pick up
directly reflected "lands". That is the opposite of "pits", and is
quite bright bouncing back into the pickup for a "one" binary read.
The "pits", and all other extraneous reflections, such as the
friggin' scatter that is claimed to be reduced or negated by this
green Magic Marker technique, does NOT get read at all, so it is, and
has always been bullshit.
D
DarkMatter
Guest
On Thu, 13 May 2004 06:17:53 GMT, Repeating Rifle
<SalmonEgg@sbcglobal.net> Gave us:
<SalmonEgg@sbcglobal.net> Gave us:
It is.
D
DarkMatter
Guest
On Wed, 12 May 2004 23:43:06 -0700, "Richard Henry" <rphenry@home.com>
Gave us:
Gave us:
It was. It didn't work, because it DOESN'T work.
D
Dave VanHorn
Guest
I thought they became microchip?
D
DarkMatter
Guest
On Thu, 13 May 2004 23:15:17 -0500, "Dave VanHorn"
<dvanhorn@cedar.net> Gave us:
which is not exactly what happened... :]
GI has been around for decades, they bought the encoder division
which was formerly an arm of Titan/ Linkabit. Or was them.
Anyway... thank them and Woo Paik in particular (now in S. Korea as
Pres of his own company) specifically for HDTV in digital form. Were
it not for them, the idiots in the consortium would have made an
analog version... Oh boy.
<dvanhorn@cedar.net> Gave us:
Motorola only bought the uplink encoder division from what I know...
which is not exactly what happened... :]
GI has been around for decades, they bought the encoder division
which was formerly an arm of Titan/ Linkabit. Or was them.
Anyway... thank them and Woo Paik in particular (now in S. Korea as
Pres of his own company) specifically for HDTV in digital form. Were
it not for them, the idiots in the consortium would have made an
analog version... Oh boy.
B
Ben Bradley
Guest
In alt.engineering.electrical,sci.electronics.design, Repeating Rifle
<SalmonEgg@sbcglobal.net> wrote:
lot longer. I googled and looked through several links, this one (a MS
Word file) seems to have the most tech info:
www.oldradio.com/archives/jurassic/ELF.doc
I read about this on webpages a year or two ago (promted by
messages here on SED, IIRC), I recall that this was supposed to be a
system that just transmits carrier, and when submarines received it
they would rise closer to the surface where they could recieve the
actual message through a higher frequency (but still VLF)
transmission. But from the link above, they actually modulate the 76
Hz to send short (perhaps as short as one byte or less) messages. So
of course the messages are in the clear, but the exact meaning of,
say, 10111001, is surely a closely guarded secret.
http://mindspring.com/~benbradley
<SalmonEgg@sbcglobal.net> wrote:
It's been on the web for years, and apparently been public for a
lot longer. I googled and looked through several links, this one (a MS
Word file) seems to have the most tech info:
www.oldradio.com/archives/jurassic/ELF.doc
I read about this on webpages a year or two ago (promted by
messages here on SED, IIRC), I recall that this was supposed to be a
system that just transmits carrier, and when submarines received it
they would rise closer to the surface where they could recieve the
actual message through a higher frequency (but still VLF)
transmission. But from the link above, they actually modulate the 76
Hz to send short (perhaps as short as one byte or less) messages. So
of course the messages are in the clear, but the exact meaning of,
say, 10111001, is surely a closely guarded secret.
-----
http://mindspring.com/~benbradley
D
daestrom
Guest
"bushbadee" <bushbadee@verizon.net> wrote in message
news:aNAoc.191494$L31.102119@nwrddc01.gnilink.net...
wouldn't it? The whole idea was to have the black 'wire' float along the
surface and receive incoming transmissions without the submarine having to
surface. Sinking the wire would make it harder to receive RF.
daestrom
news:aNAoc.191494$L31.102119@nwrddc01.gnilink.net...
That would kind of defeat the purpose of having a 'floating wire' now
wouldn't it? The whole idea was to have the black 'wire' float along the
surface and receive incoming transmissions without the submarine having to
surface. Sinking the wire would make it harder to receive RF.
daestrom
B
bushbadee
Guest
They probly use blue light any way.
Some years ago I designed a power supply for an 155 mm artillery shell or a
rocket.
The thing only had to work for about 1 minute.
It powered a transmitter which would be used to call back SAC bombers in the
event that they were on a bombing mission.
The idea was to get the transmitter high into the air for maximum
transmission distance.
"daestrom" <daestrom@NO_SPAM_HEREtwcny.rr.com> wrote in message
news:VZ2pc.187154$M3.22126@twister.nyroc.rr.com...
Some years ago I designed a power supply for an 155 mm artillery shell or a
rocket.
The thing only had to work for about 1 minute.
It powered a transmitter which would be used to call back SAC bombers in the
event that they were on a bombing mission.
The idea was to get the transmitter high into the air for maximum
transmission distance.
"daestrom" <daestrom@NO_SPAM_HEREtwcny.rr.com> wrote in message
news:VZ2pc.187154$M3.22126@twister.nyroc.rr.com...
K
Ken Smith
Guest
In article <yrwoc.247311$e17.176084@twister.nyroc.rr.com>,
daestrom <daestrom@NO_SPAM_HEREtwcny.rr.com> wrote:
[.. no trailing antenna..]
for the ELF we were talking about.
--
--
kensmith@rahul.net forging knowledge
daestrom <daestrom@NO_SPAM_HEREtwcny.rr.com> wrote:
[.. no trailing antenna..]
I guess I should have been clearer. I meant they don't trail an antenna
for the ELF we were talking about.
--
--
kensmith@rahul.net forging knowledge
K
Ken Smith
Guest
In article <k4v2a05qjmhjsgql95tbdsig7flqaq7urs@4ax.com>,
Tim Auton <tim.auton@uton.[groupSexWithoutTheY]> wrote:
[...]
signal source for doing EM. I don't know if anyone uses the 75Hz on
purpose for the same job. Its a bit too low.
--
--
kensmith@rahul.net forging knowledge
Tim Auton <tim.auton@uton.[groupSexWithoutTheY]> wrote:
[...]
I know that the geophysics industry used the 15KHz transmitters as a76Hz indeed. Wavelengths of thousands of km. Antenna *feedlines* tens
of km long. It's fascinating stuff. If it's meant to be a secret
they're not doing a very good job of keeping it
signal source for doing EM. I don't know if anyone uses the 75Hz on
purpose for the same job. Its a bit too low.
--
--
kensmith@rahul.net forging knowledge
T
Tim Auton
Guest
"bushbadee" <bushbadee@verizon.net> wrote:
[ELF and submarine comms in general]
ELF, VLF, acoustic signaling and a variety of other systems.
Tim
--
Love is a travelator.
[ELF and submarine comms in general]
Perhaps they do they do, but that doesn't mean they don't also use
ELF, VLF, acoustic signaling and a variety of other systems.
Tim
--
Love is a travelator.
T
Tim Auton
Guest
kensmith@violet.rahul.net (Ken Smith) wrote:
Russian one at least) for geophysics research.
Tim
--
Love is a travelator.
If you'd read the link I gave you'd know they do use ELF (the 82HzIn article <k4v2a05qjmhjsgql95tbdsig7flqaq7urs@4ax.com>,
Tim Auton <tim.auton@uton.[groupSexWithoutTheY]> wrote:
[...]
76Hz indeed. Wavelengths of thousands of km. Antenna *feedlines* tens
of km long. It's fascinating stuff. If it's meant to be a secret
they're not doing a very good job of keeping it
I know that the geophysics industry used the 15KHz transmitters as a
signal source for doing EM. I don't know if anyone uses the 75Hz on
purpose for the same job. Its a bit too low.
Russian one at least) for geophysics research.
Tim
--
Love is a travelator.