For those non-ham radio types, a "Cantenna" was originally a "dummy load" for tuning or testing a radio transmitter. Sold by Heathkit, it consisted of a 50 ohm non-inductive resistor submerged in a gallon paint can full of oil for heat dissipation.
I was wondering if Homeland Security determined that al Qaeda was using them as pipe bombs or something....
[quote]Never has a majority of the United States had an engineering/science degree, yet the nation always had high support for its space program.[/quote]
Who said ANYTHING about having a DEGREE in science/engineering? A basic literacy and interest in a subject DOES NOT require a degree...
[quote]At what point in history has Joe Sixpack ever had an engineering degree? Never.[/quote]
There you go with the crap about degrees again.
Back at the time of Mercury/Gemini/Apollo, the AVERAGE person had more of a "hands on" involvement with the technology in their everyday life, even if the technologies of the day were crude compared to what we have today.
Back then, many people actually tuned up their own cars, changed blown tubes in their TV sets, and handled other tasks that nowadays are the domain of "professionals". Many technologies have become "black boxes", which require expensive, specialized equipment to repair. You can't buy a Heathkit stereo anymore, and most kids wouldn't have the patience or attention span to assemble one anyway! Public schools and pop culture have seen to that....
As people become more isolated from the workings of the world, curiosity starts to wane. It is a short step from lack of personal curiosity to lack of support for scientific exploration in general.
[quote]Bottom line: this lack of support doesn't come from a lack of scientific training.[/quote]
Again, not a lack of scientific TRAINING (not everyone needs to be a scientist/engineer), but a lack of INTEREST in things scientific....
[quote]Never has a majority of the United States had an engineering/science degree, yet the nation always had high support for its space program.[/quote]
Who said ANYTHING about having a DEGREE in science/engineering? A basic literacy and interest in a subject DOES NOT require a degree...
[quote]At what point in history has Joe Sixpack ever had an engineering degree? Never.[/quote]
There you go with the crap about degrees again.
Back at the time of Mercury/Gemini/Apollo, the AVERAGE person had more of a "hands on" involvement with the technology in their everyday life, even if the technologies of the day were crude compared to what we have today.
Back then, many people actually tuned up their own cars, changed blown tubes in their TV sets, and handled other tasks that nowadays are the domain of "professionals". Many technologies have become "black boxes", which require expensive, specialized equipment to repair. You can't buy a Heathkit stereo anymore, and most kids wouldn't have the patience or attention span to assemble one anyway! Public schools and pop culture have seen to that....
As people become more isolated from the workings of the world, curiosity starts to wane. It is a short step from lack of personal curiosity to lack of support for scientific exploration in general.
[quote]Bottom line: this lack of support doesn't come from a lack of scientific training.[/quote]
Again, not a lack of scientific TRAINING (not everyone needs to be a scientist/engineer), but a lack of INTEREST in things scientific....
Since when do university degrees NECESSARILY equate with scientific literacy? Not all degrees are given in science or engineering, after all. There are LOTS of degrees in liberal arts, business administration, advanced basketweaving, etc. that are handed out with little need for learning science.
Enrollment in science/engineering programs among US students is dropping. While our society becomes more and more DEPENDENT on science and technology, the percentage of the populace who actually UNDERSTAND how things like computers, genetic engineering and space travel actually WORK is probably at an all-time low.
Joe Sixpack cares more about crashing in front of his TV than in what makes the damn thing work, and the same goes for his kids and their video games....
Seems to me that 3 astronauts died during a routine test on the launch pad in 1967. This would seem to be an even harder blow to public support, because they never even left the ground. But instead, the lessons learned through their deaths re-energized the space program, and we landed on the moon less than 2 years later.
I think the current lack of public support has a lot more to do with scientific illiteracy and the negative cultural view of scientists/engineers than it does with Challenger and Columbia.
Due to the unknown mass, irregular shape, partial breakup in the atmosphere, and lack of precision control, it would seem to be difficult to target the reentry to a specific CONTINENT, let alone the desired CITY.
You could end up dropping the thing on yourself as easily as hitting your enemy.
While the men went off to war, the women went to work in defense plants and other facilities to aid the war effort. Children helped with scrap metal drives and such, while seniors tended "Victory Gardens".
Would Japan have been justified in wiping out a couple of major US cities if it had developed the capability to do so?
But the topic at hand isn't killing an ENEMY, but knowingly killing innocent civilians by following orders blindly. Or do you automatically consider all citizens of an opposing country in wartime to be "The Enemy"?
Following orders to kill civilians is a war crime, as is giving those orders in the first place.
As the alkali metals go, calcium and lithium are fairly low in reactivity, with sodium, potassium and cesium being increasingly more reactive. In water, calcium might bubble a bit, lithium bubbles and gets really hot, sodium pops and burns, potassium explodes, and cesium would shatter the container!
I had never heard about 35mm cameras being used at all on the Apollo missions. I think they might have been used on Mercury/Gemini, though.
I would think that the big chunky Hasselblad would be easier to operate wearing a pressure suit and gloves. I had read somewhere that the 500EL/M required only minimal modifications to be usable in space, primarily the removal of the leatherette trim, installation of a special reticle plate (the famous crosshairs seen on all the shots), and special lubricants to withstand the wide temperature range.
From what I have heard, the reason for the CGI during the muffler roll was simply to allow the video to be edited together.
The room that the machine was set up in wasn't long enough to incorporate the entire setip, so it was done in 2 parts, with the rolling muffler being the transition shot between the 2 halves.
While some X-rays are generated, unless the accelerating voltage is over 10kV or so (more than gen 0 image converter tubes operated at), the X-rays are of such low energy that they can't even penetrate the tube envelope. They would start to become a hazard at around 16 kV or so.
Yes, they will biodegrade. But while they are doing so, they eat up space in the landfill that could have been used for stuff that won't biodegrade and can't be disposed of in other locations.
Mass quantities of rotting leaves and grass clippings in a landfill also produce a lot of methane gas that has to be dealt with or it will become a fire hazard.
but I STILL have a problem with it being a REQUIREMENT to get a license in this day and age.
Yes, CW is useful for weak signal work, and could theoretically be helpful in an emergency situation where nothing else was available (sending morse by tapping 2 wires together, etc...). But outside of the amateur service (and the occasional automated ID system), it simply isn't used anymore.
A much better argument could be made for OTHER practical radio skills that have much more widespread application nowadays, and help support the basis and purpose of the amateur service. How about requiring prospective hams to be able to solder a PL-259 plug onto a length of coax? Or read a schematic? Identify a group of assorted electronic components? Or use a multimeter? Or build a simple wire dipole antenna?
Any of these skills would serve as a suitable "lid filter", and together with NOT PUBLISHING THE ACTUAL EXAM QUESTION POOL could go a long way toward reversing the trend toward "appliance operators" that has been destroying the service since commercial SSB gear became available.
In an emergency, a ham who knows enough electronic theory and practice to jury-rig a station onto the air would be a LOT more useful than an appliance operator who can pound brass at 20 WPM.
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For those non-ham radio types, a "Cantenna" was originally a "dummy load" for tuning or testing a radio transmitter. Sold by Heathkit, it consisted of a 50 ohm non-inductive resistor submerged in a gallon paint can full of oil for heat dissipation.
I was wondering if Homeland Security determined that al Qaeda was using them as pipe bombs or something....
Reposted due to formatting screwup....
[quote]Never has a majority of the United States had an engineering/science degree, yet the nation always had high support for its space program.[/quote]
Who said ANYTHING about having a DEGREE in science/engineering? A basic literacy and interest in a subject DOES NOT require a degree...
[quote]At what point in history has Joe Sixpack ever had an engineering degree? Never.[/quote]
There you go with the crap about degrees again.
Back at the time of Mercury/Gemini/Apollo, the AVERAGE person had more of a "hands on" involvement with the technology in their everyday life, even if the technologies of the day were crude compared to what we have today.
Back then, many people actually tuned up their own cars, changed blown tubes in their TV sets, and handled other tasks that nowadays are the domain of "professionals". Many technologies have become "black boxes", which require expensive, specialized equipment to repair. You can't buy a Heathkit stereo anymore, and most kids wouldn't have the patience or attention span to assemble one anyway! Public schools and pop culture have seen to that....
As people become more isolated from the workings of the world, curiosity starts to wane. It is a short step from lack of personal curiosity to lack of support for scientific exploration in general.
[quote]Bottom line: this lack of support doesn't come from a lack of scientific training.[/quote]
Again, not a lack of scientific TRAINING (not everyone needs to be a scientist/engineer), but a lack of INTEREST in things scientific....
[quote]Never has a majority of the United States had an engineering/science degree, yet the nation always had high support for its space program.[/quote] Who said ANYTHING about having a DEGREE in science/engineering? A basic literacy and interest in a subject DOES NOT require a degree... [quote]At what point in history has Joe Sixpack ever had an engineering degree? Never.[/quote] There you go with the crap about degrees again. Back at the time of Mercury/Gemini/Apollo, the AVERAGE person had more of a "hands on" involvement with the technology in their everyday life, even if the technologies of the day were crude compared to what we have today. Back then, many people actually tuned up their own cars, changed blown tubes in their TV sets, and handled other tasks that nowadays are the domain of "professionals". Many technologies have become "black boxes", which require expensive, specialized equipment to repair. You can't buy a Heathkit stereo anymore, and most kids wouldn't have the patience or attention span to assemble one anyway! Public schools and pop culture have seen to that.... As people become more isolated from the workings of the world, curiosity starts to wane. It is a short step from lack of personal curiosity to lack of support for scientific exploration in general. [quote]Bottom line: this lack of support doesn't come from a lack of scientific training.[/quote] Again, not a lack of scientific TRAINING (not everyone needs to be a scientist/engineer), but a lack of INTEREST in things scientific....
Since when do university degrees NECESSARILY equate with scientific literacy? Not all degrees are given in science or engineering, after all. There are LOTS of degrees in liberal arts, business administration, advanced basketweaving, etc. that are handed out with little need for learning science.
Enrollment in science/engineering programs among US students is dropping. While our society becomes more and more DEPENDENT on science and technology, the percentage of the populace who actually UNDERSTAND how things like computers, genetic engineering and space travel actually WORK is probably at an all-time low.
Joe Sixpack cares more about crashing in front of his TV than in what makes the damn thing work, and the same goes for his kids and their video games....
Seems to me that 3 astronauts died during a routine test on the launch pad in 1967. This would seem to be an even harder blow to public support, because they never even left the ground. But instead, the lessons learned through their deaths re-energized the space program, and we landed on the moon less than 2 years later.
I think the current lack of public support has a lot more to do with scientific illiteracy and the negative cultural view of scientists/engineers than it does with Challenger and Columbia.
Due to the unknown mass, irregular shape, partial breakup in the atmosphere, and lack of precision control, it would seem to be difficult to target the reentry to a specific CONTINENT, let alone the desired CITY.
You could end up dropping the thing on yourself as easily as hitting your enemy.
While the men went off to war, the women went to work in defense plants and other facilities to aid the war effort. Children helped with scrap metal drives and such, while seniors tended "Victory Gardens".
Would Japan have been justified in wiping out a couple of major US cities if it had developed the capability to do so?
But the topic at hand isn't killing an ENEMY, but knowingly killing innocent civilians by following orders blindly. Or do you automatically consider all citizens of an opposing country in wartime to be "The Enemy"?
Following orders to kill civilians is a war crime, as is giving those orders in the first place.
As the alkali metals go, calcium and lithium are fairly low in reactivity, with sodium, potassium and cesium being increasingly more reactive. In water, calcium might bubble a bit, lithium bubbles and gets really hot, sodium pops and burns, potassium explodes, and cesium would shatter the container!
I had never heard about 35mm cameras being used at all on the Apollo missions. I think they might have been used on Mercury/Gemini, though. I would think that the big chunky Hasselblad would be easier to operate wearing a pressure suit and gloves. I had read somewhere that the 500EL/M required only minimal modifications to be usable in space, primarily the removal of the leatherette trim, installation of a special reticle plate (the famous crosshairs seen on all the shots), and special lubricants to withstand the wide temperature range.
HTTP 420: The page you requested has been dried and smoked. No further information available at this time...
The Apollo crews used modified Hasselblad 500EL/M's loaded with 70mm film, not a standard 35mm SLR...
a po llo.photechnqs.htm
a 11 /a11-hass.html
http://www.hq.nasa.gov/office/pao/History/alsj/
http://www.hq.nasa.gov/office/pao/History/alsj/
at least among ham radio operators. One's transmitter has been referred to as a "rig" since the beginning of the hobby.
Paregoric is a tincture of opium and camphor. The active ingredient is morphine, not heroin.
From what I have heard, the reason for the CGI during the muffler roll was simply to allow the video to be edited together.
The room that the machine was set up in wasn't long enough to incorporate the entire setip, so it was done in 2 parts, with the rolling muffler being the transition shot between the 2 halves.
The kind that they lob into Palestinian villages are still perfectly OK, right?
If the metal target was in a vacuum, maybe...
While some X-rays are generated, unless the accelerating voltage is over 10kV or so (more than gen 0 image converter tubes operated at), the X-rays are of such low energy that they can't even penetrate the tube envelope. They would start to become a hazard at around 16 kV or so.
Yes, they will biodegrade. But while they are doing so, they eat up space in the landfill that could have been used for stuff that won't biodegrade and can't be disposed of in other locations.
Mass quantities of rotting leaves and grass clippings in a landfill also produce a lot of methane gas that has to be dealt with or it will become a fire hazard.
If you smacked the rabbit with a suitcase-sized piece of the foam at ~700 MPH you sure as hell could....
but I STILL have a problem with it being a REQUIREMENT to get a license in this day and age.
Yes, CW is useful for weak signal work, and could theoretically be helpful in an emergency situation where nothing else was available (sending morse by tapping 2 wires together, etc...). But outside of the amateur service (and the occasional automated ID system), it simply isn't used anymore.
A much better argument could be made for OTHER practical radio skills that have much more widespread application nowadays, and help support the basis and purpose of the amateur service. How about requiring prospective hams to be able to solder a PL-259 plug onto a length of coax? Or read a schematic? Identify a group of assorted electronic components? Or use a multimeter? Or build a simple wire dipole antenna?
Any of these skills would serve as a suitable "lid filter", and together with NOT PUBLISHING THE ACTUAL EXAM QUESTION POOL could go a long way toward reversing the trend toward "appliance operators" that has been destroying the service since commercial SSB gear became available.
In an emergency, a ham who knows enough electronic theory and practice to jury-rig a station onto the air would be a LOT more useful than an appliance operator who can pound brass at 20 WPM.
Morse requirements are now left up to individual nations to decide for themselves, and many have removed the requirement completely.
Actually, there are 4 units in morse code, the dash, the dot, the space between letters, and a longer space between words.
Let me guess: One more justification for hanging onto the 5WPM morse requirement, right?
Seeing as the "L" in "laser" stands for LIGHT, a device putting out power at 300 MHz is NOT going to be a LASER.