plexiglass
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Anyone have the top and sides of the K2 made from Plexiglass and a source?
Would be nice to see the components in the rig as it sits on the operating desk. 73 john-n4dsp _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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John:
It would be nice, but acrylic doesn't make a very good RF shield! 73's, John AA0VE n4dsp wrote: > Anyone have the top and sides of the K2 made from Plexiglass and a > source? Would be nice to > see the components in the rig as it sits on the > operating desk. > 73 > john-n4dsp > _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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If cost is no object, you might try optically clear EMI shielding, like
Chomerics' WIN-SHIELD: http://www.chomerics.com/products/winshield-elite.htm There are others making similar plastics with EMI shields built-in. Even those CRT radiation sheets might work. Google "clear plastic EMI shielding" Brings back memories of "The Visible Engine", doesn't it? Brian, W0DZ -----Original Message----- From: [hidden email] [mailto:[hidden email]]On Behalf Of John R. Lonigro Sent: Saturday, July 08, 2006 4:30 AM To: elecraft Subject: Re: [Elecraft] plexiglass John: It would be nice, but acrylic doesn't make a very good RF shield! 73's, John AA0VE n4dsp wrote: > Anyone have the top and sides of the K2 made from Plexiglass and a > source? Would be nice to > see the components in the rig as it sits on the > operating desk. > 73 > john-n4dsp > _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by John Lonigro
On Sat, 08 Jul 2006 05:30:16 -0500 "John R. Lonigro"
<[hidden email]> writes: >John: >It would be nice, but acrylic doesn't make a very good RF shield! Ah... what we need is transparent aluminum. But, of course we don't have such a thing..... at least..... not officially.... clandestinely yours, Scotty, aka N5IB _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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Wait Scotty showed the guy in san fran sisco the formula for transparent
aluminum when they came back in the klingon war bird to get the two hump back whales so we got to have it by now either that or that guy is sitting on a gold mine.:) -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of [hidden email] Sent: Saturday, July 08, 2006 12:43 PM To: [hidden email] Subject: Re: [Elecraft] plexiglass On Sat, 08 Jul 2006 05:30:16 -0500 "John R. Lonigro" <[hidden email]> writes: >John: >It would be nice, but acrylic doesn't make a very good RF shield! Ah... what we need is transparent aluminum. But, of course we don't have such a thing..... at least..... not officially.... clandestinely yours, Scotty, aka N5IB _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by n5ib
On Sat, 8 Jul 2006 [hidden email] wrote:
> On Sat, 08 Jul 2006 05:30:16 -0500 "John R. Lonigro" > <[hidden email]> writes: >> John: >> It would be nice, but acrylic doesn't make a very good RF shield! > > Ah... what we need is transparent aluminum. But, of course we don't have > such a thing..... at least..... not officially.... I always thought that was the material used to make the helmets that folks wear to protect themselves against the "rays". The real trick would be to produce one way transparent aluminum, and use it in goggles that would sheild one from "mal ochio", yet allowing the user to see well enough to conduct business. I will speak to some of the older and wiser men at the Bocce court and attempt to find a source. > > clandestinely yours, > Scotty, aka N5IB > Yours in the spirit of frictionless transactions, I, and my family, remain at your service. Thom K3HRN _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by David-470
Ah, this explains the cost of aluminum these days !!! HI
73, Jamie WB4YDL -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of DAVID Sent: Saturday, July 08, 2006 12:23 PM To: [hidden email] Subject: RE: [Elecraft] plexiglass Wait Scotty showed the guy in san fran sisco the formula for transparent aluminum when they came back in the klingon war bird to get the two hump back whales so we got to have it by now either that or that guy is sitting on a gold mine.:) _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by n5ib
On Sat, 8 Jul 2006 11:42:50 -0500 <[hidden email]> writes:
>Ah... what we need is transparent aluminum. But, of course we don't >have such a thing..... at least..... not officially.... In the interests of academic integrity, I gotta come clean :^)) In his book "The Wizard War" Prof. R. V. Jones, soon to become Britain's director of scientific intelligence during WW2, relates how he spoofed an overly inquisitive Admiraty Research Lab staffer who had had suggested the value of a substance that was both a good conductor of electricity and also tranparent to light. "But we haven't got transparent metal, have we Doctor?" the staffer asked. "No," Jones replied, then paused conspiritorially , "Well, no, not officially." Jones was such an accomplished master of the art of spoof that he soon convinced the staffer that the admiralty was trying to build an invisible battleship, but had only been able to produce enough of the metal to build an invisible topedo boat, which was still troubled by the fact that the wake was visible, as was the crew. If you've never read it... get "The Wizard War" by R. V. Jones., ISBN 0-698-10896-5 published in Britain as "Most Secret War" There is a passage where he credits the contributions of Britain's ham radio enthusiasts in providing a cadre of sorely needed radio and electronics savvy personnel out the onset of the war. And points out how Germany's supression of hams had deprived them of a similar resource. Hence Germany had to bring a device nearly to the point of fool-proof perfection before releasing it for use, whereas the British could put systems barely past the prototype stage into operations, knowing they had enough "tinkerers" who could make it work. Jones also relates that as a boy he had built a SW receiver that could pick up Australia, and had received from Radio Australia a QSL card signed by the English Test Team (cricket, for us yanks) 73 Jim N5IB _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by n4dsp
In a message dated 7/8/06 10:33:47 PM Eastern Daylight Time, [hidden email]
writes: > Hence Germany had to bring a device nearly to the point of fool-proof > perfection before releasing it for use, whereas the British could put > systems barely past the prototype stage into operations, knowing they had > enough "tinkerers" who could make it work. > And even that didn't always work. Once the Allies developed and deployed radar sets that could be carried by long-distance antisubmarine aircraft, U-boat losses rose dramatically. The response was to develop radar detectors - receivers that could hear the Allied radar transmitters, warning the U-boat crews to dive before the Allied aircraft could find them. But the German radar detector receivers used supperregenerative detectors, which radiate a weak signal. The Allies soon learned they could detect these weak signals. They began to turn off their radar transmitters and listen for the tell tale noise of the radar detectors. Rather than helping evade, the radar detectors began leading the Allies to the U-boats. Of course an amateur would have known that superregens radiate.... Elecraft connection: None of the Elecraft rigs uses a superregenerative detector. 73 de Jim, N2EY _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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"But the German radar detector receivers used supperregenerative
detectors,which radiate a weak signal." Don't know whether this is apocryphal or not, but I had heard from a former USAF EW tech that the VC in Viet Nam in the early days figured out how to make U.S. field superhets' LO "howl" , giving away qth, causing some units to switch to TRF technology. Gil NN4CW _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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I apologize to everyone how this thread has drifted.
I only asked if anyone has knowledge of where to obtain plexiglass for my K2. Appreciate if we can stay on topic. We are now into German Warfare and has nothing to do with plexiglass. Please Gentlemen. 73 john-n4dsp _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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John,
Look in your phone book yellow pages for a local commercial plastics supplier. They often have cut-offs for sale at modest prices. If you have to buy a whole sheet, take along a wheelbarrow full of money. 73, Don W3FPR > -----Original Message----- > > I apologize to everyone how this thread has drifted. > I only asked if anyone has knowledge of where to > obtain plexiglass for my K2. Appreciate if we can > stay on topic. We are now into German Warfare and > has nothing to do with plexiglass. Please Gentlemen. > 73 > john-n4dsp > _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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Don raises a very good technique that use frequently. In fact yesterday I stopped by the place and
pick up a piece of 5/16 that was roughly 14 x 6 inches for the whole wallet breaking sum of something around $1.00. I was charged by weight, although sometimes they charge by area as well. For something like the sides of the K2, using 1/8" should be OK. If you couldn't find something in the scrap bin and pick it up for a couple of dollars I'd be amazed. Cheers, -rick, K7LOG -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Don Wilhelm Sent: Sunday, July 09, 2006 6:40 AM To: Elecraft reflector; n4dsp Subject: RE: [Elecraft] plexiglass John, Look in your phone book yellow pages for a local commercial plastics supplier. They often have cut-offs for sale at modest prices. If you have to buy a whole sheet, take along a wheelbarrow full of money. 73, Don W3FPR . . . _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Don Wilhelm-3
Don, W3FPR wrote:
Look in your phone book yellow pages for a local commercial plastics supplier. They often have cut-offs for sale at modest prices. If you have to buy a whole sheet, take along a wheelbarrow full of money. -------------------------------------------------- You might do well if there's a "Tap Plastics" dealer nearby. They are all over the USA, I believe, and custom cut acrylic sheet for individuals at a very reasonable price. If a K2 will operate with the sides and top off, I can't see how it'd be any worse with clear top and sides. Just don't replace the heat sink on the bottom of the K2 (or on top of the KPA100) with plastic! That said, sure it'll be somewhat more susceptible to RFI and perhaps even produce a little RFI without the metal case, perhaps. And even if it does it may not be significant in your situation. Ron AC7AC _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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I gave John a bum steer I guess. Tap Plastics appears to be a west-coast
company. They have a web site at: http://www.tapplastics.com/ They've been an invaluable resource for me for a variety of things, radio and non-radio related. Maybe someone knows of similar companies serving other areas of the country. Ron AC7AC _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Gil Stacy-2
In my reading about green radios I can't afford (but want anyway) and
in various readings I've heard that detecting the 455-kHz LO of a superhet isn't all that hard, and that for instance in countries that require a radio license, they use such techniques to check if people in their houses have radios (or TVs) that they're not on record of having licenses for! And, in a lot of the military radios, the shielding is VERY good so that detection is much harder to do. 73 de Alex NS6Y. On Jul 9, 2006, at 5:29 AM, Gil Stacy wrote: > "But the German radar detector receivers used supperregenerative > detectors,which radiate a weak signal." > > Don't know whether this is apocryphal or not, but I had heard from a > former USAF EW tech that the VC in Viet Nam in the early days > figured out > how to make U.S. field superhets' LO "howl" , giving away qth, > causing some > units to switch to TRF technology. > > Gil NN4CW Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Ron D'Eau Claire-2
On Sun, 9 Jul 2006, Ron D'Eau Claire wrote:
> I gave John a bum steer I guess. Tap Plastics appears to be a west-coast > company. They have a web site at: > http://www.tapplastics.com/ > > They've been an invaluable resource for me for a variety of things, radio > and non-radio related. Maybe someone knows of similar companies serving > other areas of the country. Small hobby stores might have odd things like that. If you can imagine needing it for an RC car or airplane, they would have it. -- Hisashi T Fujinaka - [hidden email] BSEE(6/86) + BSChem(3/95) + BAEnglish(8/95) + MSCS(8/03) + $2.50 = latte _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by n4dsp
Screen (silk screen) printers and sign printers often have small pieces of
plexi left over from jobs that they might be willing to sell at a modest price. Mike, KC2TP _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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The trick is often in cutting or drilling it cleanly and squarely without
melting or scratching it, and in polishing the edges. The nice thing about a place like Tap Plastics is you take a template or dimensions to the store and in a few minutes you walk out with nicely cut, polished and even drilled materials ready to use! They'll even glue up assemblies requiring more than one piece. It's a great service! I'd be very surprised it was only available on the west coast of the USA. If so, I suspect it's a business someone could do very well with in our do-it-yourself culture. Ron AC7AC -----Original Message----- Screen (silk screen) printers and sign printers often have small pieces of plexi left over from jobs that they might be willing to sell at a modest price. Mike, KC2TP _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by n4dsp
In a message dated 7/9/06 8:29:47 AM Eastern Daylight Time,
[hidden email] writes: > Don't know whether this is apocryphal or not, but I had heard from a > former USAF EW tech that the VC in Viet Nam in the early days figured out > how to make U.S. field superhets' LO "howl" , giving away qth, causing some > units to switch to TRF technology. > Urban legend. Not true. There's no way to do what was claimed without access to the receiver itself. 73 de Jim, N2EY _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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