kevin gilmore Posted January 29, 2011 Report Share Posted January 29, 2011 So for various reasons that i won't exactly go into, i'm about to have a bunch of surplus stuff looking for an application. A bunch of programmed test sources signal generators. computer controllable. All phase coherent to the master reference source. http://www.programmedtest.com/pts500.html 3 x 1 mhz to 500 mhz generators 1 x 1 mhz to 620 mhz generator with dual outputs that can be inter-modulated 3 x 1 mhz to 300 mhz generators one with dual outputs that can be inter-modulated And some CW capable class A RF power amps 2 x 200mhz to 500mhz 50 watts 3 x 10mhz to 200mhz 300 watts As i said, looking for an application. So i contacted craig who is one of the few people that i can think of who can come up with something creative. (knowing full well that he knows where i got the stuff) So we decided on setting up the stuff in tyll's house. (someone tell tyll) Lots of copper screening on the walls, floors and ceiling all soldered together to make a very nice and radiation proof screen room. I mean tyll clearly needs his demo room to be fully shielded anyway so the aliens don't mess with his brain... The idea is to test all the claims of various manufacturers of cables with respect to their supposed ability to remove RF due to (insert techno babble here). All i need now, are some standard antenna's, and a local oscillator/mixer box (actually already have it) and we can bring it down to baseband, and then tyll's audio precision can measure it directly. Probably don't want to be in the same room at the same time if we are running the amps at full blast. So what do people think? Quote Link to comment Share on other sites More sharing options...
chinsettawong Posted January 29, 2011 Report Share Posted January 29, 2011 Insane! Quote Link to comment Share on other sites More sharing options...
Dusty Chalk Posted January 29, 2011 Report Share Posted January 29, 2011 By 'radiation', I presume you mean RF radiation? Because I don't see anything in there that merits nuclear radiation symbols, nor do I think the screening would help in that case. Are you going to the point of microwaves and photo-electric effect? Because if so, I want pitchers. You'll have to figure out a way to do that too without destroying the camera. Yes, I said that while resisting the temptation to include the words "arcy" and "sparky" in there. Quote Link to comment Share on other sites More sharing options...
DouglasQuaid Posted January 29, 2011 Report Share Posted January 29, 2011 Because if so, I want pitchers. Screw pictures, I want videos of people breaking into Tyll's house. Quote Link to comment Share on other sites More sharing options...
spritzer Posted January 29, 2011 Report Share Posted January 29, 2011 Like I just told Kevin, sometimes I really glad that a good part of the northern Atlantic sits between us. I'd live in constant fear of crazy shit like this showing up... Quote Link to comment Share on other sites More sharing options...
Currawong Posted January 29, 2011 Report Share Posted January 29, 2011 I can't wait to see the "after" pics if you do blow anything up. Quote Link to comment Share on other sites More sharing options...
Tyll Hertsens Posted January 29, 2011 Report Share Posted January 29, 2011 Suweet! Does that mean I can cook the brat while Im eating it? Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted January 29, 2011 Author Report Share Posted January 29, 2011 (edited) Suweet! Does that mean I can cook the brat while Im eating it? Actually this is possible. I have done demo's on this already. 30 mhz at a couple hundred watts into 3 turns of a coil. Stick tube steak in one end, and it cooks as you push it thru. Bump it up to 3kw and you get burning argon gas. And by radiation i mean broadband RF, 1 mhz to say 1ghz. None of the cable companies are advertising anything related to nuclear radiation. More practical is a desktop lindgreen screen room, and i think i know where to get one of those. Now how to convince all the cable manufacturers who obviously don't want their claims actually tested to fork over some demo material. Edited January 29, 2011 by kevin gilmore Quote Link to comment Share on other sites More sharing options...
Craig Sawyers Posted January 29, 2011 Report Share Posted January 29, 2011 Now how to convince all the cable manufacturers who obviously don't want their claims actually tested to fork over some demo material. You stand a pretty good chance with Kimber - Ray Kimber was a recording engineer before he set up the company, and developed the woven speaker cable to stop thyristor light dimmer crud from getting back up the PA amps, getting into the feedback loop and then coming back down to the speakers as a buzz. He'd be pretty keen to get immunity measurements as a quantitative selling point for his cables. Cardas too, I would think, MIT, Nordost and others. Martin Colloms (HiFi Critic) has been trying to get a cables consortium together, part of the aim of which is to substantiate subjective claims with real-world measurements. Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted January 29, 2011 Author Report Share Posted January 29, 2011 Lets come up with a standardized testing method How many watts at how many feet. I guess you would have to the same thing in free-field which is more like the real world. Quote Link to comment Share on other sites More sharing options...
Craig Sawyers Posted January 29, 2011 Report Share Posted January 29, 2011 Lets come up with a standardized testing method How many watts at how many feet. I guess you would have to the same thing in free-field which is more like the real world. Usually an anechoic chamber is used with conductive or ferrite loaded wedges which looks like an infinitely large environment - so trying to simulate free field, especially when the anechoic is big so you can get a good distance between antenna and DUT. I've tried finding stuff on alternatives using rf reflective walls (ie bare copper), and drawn a bit of a blank. Quote Link to comment Share on other sites More sharing options...
spritzer Posted January 29, 2011 Report Share Posted January 29, 2011 I can donate some Kimber cables for testing if somebody is up for it. I'm going to rip a KS3033 apart tonight to make some truly insane interconnects... Quote Link to comment Share on other sites More sharing options...
Tyll Hertsens Posted January 29, 2011 Report Share Posted January 29, 2011 Well Kevin, lemme know if you're really serious about something like this. I would consider housing such a tester. Not sure it's really quite up my "personal audio" ally, but I'd certainly think about it. Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted January 29, 2011 Author Report Share Posted January 29, 2011 (edited) You know i'm serious. You have seen the basement in my house. The whole setup in a half high rack on wheels should end up weighing about 300 lbs. Probably less. Generators are about 40 lbs, and the amps are about 85. Looking for standards antenna's now... But i'll probably make them, as the new price on those things is silly. Edited January 29, 2011 by kevin gilmore Quote Link to comment Share on other sites More sharing options...
Pars Posted January 30, 2011 Report Share Posted January 30, 2011 I'd think this would make you popular with many of Stereophile's advertisers Quote Link to comment Share on other sites More sharing options...
Fitz Posted January 30, 2011 Report Share Posted January 30, 2011 This is going to be awesome on so many levels. I'd gladly donate some of my own cables for testing, which I make no claims of having any benefits. Quote Link to comment Share on other sites More sharing options...
wink Posted January 30, 2011 Report Share Posted January 30, 2011 3 x 1 mhz to 500 mhz generators 1 x 1 mhz to 620 mhz generator with dual outputs that can be inter-modulated 3 x 1 mhz to 300 mhz generators one with dual outputs that can be inter-modulated And some CW capable class A RF power amps 2 x 200mhz to 500mhz 50 watts 3 x 10mhz to 200mhz 300 watts Hate to be a pedant, but shouldn't the mhz be MHz? It just had me going for a split second, but knowing some of the exotic and esoteric stuff Kevin (note the capital?) plays with, it seemed plausible that generators with such a slow frequency response would be used. Upon delving further into this post, I realised my mistake. Consider the Agilent 33250A: Sine 1 μHz to 80 MHz Square 1 μHz to 80 MHz Pulse 500 μHz to 50 MHz Arb 1 μHz to 25 MHz Ramp 1 μHz to 1 MHz White noise 50 MHz bandwidth Resolution 1 μHz; except pulse, 5 digits Accuracy (1 year) 2 ppm, 18°C to 28°C I know capitals can be a pain, but it sure helps comprehension sometimes......... Quote Link to comment Share on other sites More sharing options...
grawk Posted January 30, 2011 Report Share Posted January 30, 2011 fuck off Quote Link to comment Share on other sites More sharing options...
mypasswordis Posted January 31, 2011 Report Share Posted January 31, 2011 if you were a real pedant, you would say mhz isn't a unit of measure. if you had any sort of common sense, you wouldn't have posted. Quote Link to comment Share on other sites More sharing options...
Fitz Posted January 31, 2011 Report Share Posted January 31, 2011 Hate to be a pedant, but does anybody really give a fuck? We all knew what he meant, you knew what he meant, so what's it matter? Somehow I don't think it really necessitates acting like a smartass about it. Quote Link to comment Share on other sites More sharing options...
Craig Sawyers Posted January 31, 2011 Report Share Posted January 31, 2011 We all knew what he meant, you knew what he meant, so what's it matter? Somehow I don't think it really necessitates acting like a smartass about it. Yup - as Richard Feynman once said when a student knit-picked during a lecture "Don't listen to what I said - listen to what I meant" Quote Link to comment Share on other sites More sharing options...
wink Posted January 31, 2011 Report Share Posted January 31, 2011 mypasswordis posted:- "if you were a real pedant, you would say mhz isn't a unit of measure. if you had any sort of common sense, you wouldn't have posted." You are right, and I apologise unreservedly. Upon reflection, I realise that my post was out of line. Thank you for the correction. Quote Link to comment Share on other sites More sharing options...
Tyll Hertsens Posted January 31, 2011 Report Share Posted January 31, 2011 (edited) OOooooo! Nice shovel-duck. And whats with all this "pendant" talk? Edited January 31, 2011 by Tyll Hertsens Quote Link to comment Share on other sites More sharing options...
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