EEVblog Electronics Community Forum
EEVblog => EEVblog Specific => Topic started by: EEVblog on January 31, 2014, 08:49:26 am
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Phil VK2BDF from the Manly Warringah HAM Radio Society shows off his 1970's vintage home made 200MHz DIY spectrum analyser.
EEVblog #575 - DIY 1970s Spectrum Analyser (https://www.youtube.com/watch?v=579SYLxORyw#ws)
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That's a great project. He must be really pleased with it.
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Like the construction, everything looks good but the coils stand out, nicely wound for a hand built device.
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Sometimes.. one just have to make the tools first. :-+
Really nice build and good explanation of the device. It's easy to see that he knows what's he is talking about.
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Very nice job. :) I would have thought a marker generator would be a useful addition. But he obviously got by well enough without.
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That's the REAL electronics.
Strange, that Phil reminds me in several ways of Bob Pease.
Frank
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Analog purity. :bullshit: No digital stuff and FFT filters. He only gets two bandwidths by using what looks like a standard WFM 10.7MHz ceramic filter or a couple of cascaded 15khz NFM xtal filers
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When will you get your licence, Dave? :D
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Lovely analog stuff! It reminds me my old professor who build his own oscilloscope with incredible 2.5" cathodic tube!!! :-+
Cheers, Vanderson
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It would be nice to do something like this when I am tired of tinkering with old scopes.
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Analog purity. :bullshit: No digital stuff and FFT filters. He only gets two bandwidths by using what looks like a standard WFM 10.7MHz ceramic filter or a couple of cascaded 15khz NFM xtal filers
He made this 33 years ago when the only digital components available were 74xxx. He tells in the video that much better gear can be had at this time for 700$. Guess you have to put this in perspective.
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Re closing comments
I think its also called dead bug style construction even in the US.
Manhattan routing is likened to the X/Y street orientations of said city.
Still everyone probably knew that already.
Can't say the number of failed attempts I've had at trying to build a SA, one day.
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I love this stuff so much I watched it twice. I'm trying to build a superheterodyne receiver as a home project, so this is a real inspiration.
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Really awesome!
And Great interview.
Thx!
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Why something like this always or most of the times came from guys with grey beard ? :-DD
Great video, love it ! :-+
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Why something like this always or most of the times came from guys with grey beard ? :-DD
Great video, love it ! :-+
It wasn't grey when he built it ;D
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What about a good kick ass open hardware SA? If he did that 33! years ago where are the good DIY SA nowadays? Probably everybody is like me now: for test equipment find the product you like and drop some money from the bank out. So sad....
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What about a good kick ass open hardware SA? If he did that 33! years ago where are the good DIY SA nowadays? Probably everybody is like me now: for test equipment find the product you like and drop some money from the bank out. So sad....
You mean like this one?
http://www.scottyspectrumanalyzer.com/ (http://www.scottyspectrumanalyzer.com/)
Ed
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Damn that video really makes me wish i could wrap my head around such things... Must be lack of practice or something...
Really nice to see, nice build and god explanation of inner workings..
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Great project well done it would be nice to build something similar using individual shielded modules that connect together with coax and can be rearranged later
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Thanks for the video, would it be possible to get more information on the SA?
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Oh wow... That is a thing of beauty! A TRUE work of engineering art!
Absolutely beautiful!
I... I think have some flux fumes in my eyes...
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Uh - oh! Dave, hanging out with ham radio types! Nice video, and very cool "real analog" spectrum analyzer.
Alan W2AEW
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What kind of oscilloscope is he using?
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What kind of oscilloscope is he using?
It's an A.W. Sperry 620C, I think.
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What about a good kick ass open hardware SA? If he did that 33! years ago where are the good DIY SA nowadays? Probably everybody is like me now: for test equipment find the product you like and drop some money from the bank out. So sad....
Scotty's SA is a stellar performer but pretty complex.
Looking at ex. Tektronix guru W7ZOI he almost duplicated the Aussies :-+ http://w7zoi.net/sa-stuff.html (http://w7zoi.net/sa-stuff.html)
Others have been using old cable TV tuners as frontend... I think I do have one that I started to convert to a SA... never completed :-//
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That's a great video, but the real question is: what were you doing at that ham meeting? Informing on how to get a license? (Personally I think that would be awesome).
Remember: being a ham doesn't mean you are required to make contacts, it just means that you have a license to build, operate and experiment with transmitters. All the rest is folklore (nothing against it at all, don't get me wrong - but if it's not your cup of tea, simply don't participate).
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What kind of oscilloscope is he using?
Looked like and old Hung Chang to me, but I didn't look closely.
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That's a great video, but the real question is: what were you doing at that ham meeting?
I was invited to show off my CH7 TX gear, its was a retro 70's/80's night.
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I was invited to show off my CH7 TX gear, its was a retro 70's/80's night.
Did you win a prize for Most kW? :)
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Just saw this one today. I used to work with Phil around 25 years ago (early 90's). He wasn't as grey then, but a really nice bloke and great engineer to work with. If he's now messing with traffic controllers I can guess where he's working now. Nice to see some of his old home brew kit again.