Author Topic: EEVblog #575 - DIY 1970s Spectrum Analyser  (Read 15164 times)

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Offline EEVblog

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EEVblog #575 - DIY 1970s Spectrum Analyser
« on: January 31, 2014, 08:49:26 am »
Phil VK2BDF from the Manly Warringah HAM Radio Society shows off his 1970's vintage home made 200MHz DIY spectrum analyser.

 

Offline netdudeuk

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Re: EEVblog #575 - DIY 1970s Spectrum Analyser
« Reply #1 on: January 31, 2014, 11:26:05 am »
That's a great project.  He must be really pleased with it.
 

Offline ttp

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Re: EEVblog #575 - DIY 1970s Spectrum Analyser
« Reply #2 on: January 31, 2014, 11:30:36 am »
Like the construction, everything looks good but the coils stand out, nicely wound for a hand built device.
 

Offline JoannaK

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Re: EEVblog #575 - DIY 1970s Spectrum Analyser
« Reply #3 on: January 31, 2014, 02:10:25 pm »
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.

 

Offline atw60444

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Re: EEVblog #575 - DIY 1970s Spectrum Analyser
« Reply #4 on: January 31, 2014, 02:36:48 pm »
Very nice job. :) I would have thought a marker generator would be a useful addition. But he obviously got by well enough without.
 

Offline Dr. Frank

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Re: EEVblog #575 - DIY 1970s Spectrum Analyser
« Reply #5 on: January 31, 2014, 06:13:10 pm »
That's the REAL electronics.

Strange, that Phil reminds me in several ways of Bob Pease.

Frank
 

Offline phenol

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Re: EEVblog #575 - DIY 1970s Spectrum Analyser
« Reply #6 on: January 31, 2014, 06:48:47 pm »
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
 

Offline rushorsch

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Re: EEVblog #575 - DIY 1970s Spectrum Analyser
« Reply #7 on: January 31, 2014, 08:39:45 pm »
When will you get your licence, Dave?  :D
 

Offline vandersonpc

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Re: EEVblog #575 - DIY 1970s Spectrum Analyser
« Reply #8 on: January 31, 2014, 08:53:56 pm »
Lovely analog stuff! It reminds me my old professor who build his own oscilloscope with incredible 2.5" cathodic tube!!! :-+

Cheers, Vanderson
 

Offline mikemcginn@mcginnweb.net

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Re: EEVblog #575 - DIY 1970s Spectrum Analyser
« Reply #9 on: January 31, 2014, 10:43:29 pm »
It would be nice to do something like this when I am tired of tinkering with old scopes.
 

Offline jancumps

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Re: EEVblog #575 - DIY 1970s Spectrum Analyser
« Reply #10 on: January 31, 2014, 10:58:37 pm »
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.
 

Offline Pat Pending

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Re: EEVblog #575 - DIY 1970s Spectrum Analyser
« Reply #11 on: January 31, 2014, 11:26:29 pm »
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.
 

Offline RRobot

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Re: EEVblog #575 - DIY 1970s Spectrum Analyser
« Reply #12 on: February 01, 2014, 01:56:36 am »
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.
« Last Edit: February 01, 2014, 01:58:14 am by RRobot »
 

Offline taiteki

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Re: EEVblog #575 - DIY 1970s Spectrum Analyser
« Reply #13 on: February 01, 2014, 08:57:08 am »
Really awesome!
And Great interview.

Thx!
 

Online BravoV

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Re: EEVblog #575 - DIY 1970s Spectrum Analyser
« Reply #14 on: February 01, 2014, 08:59:41 am »
Why something like this always or most of the times came from guys with grey beard ?  :-DD

Great video, love it !  :-+

Offline kc9qvl

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Re: EEVblog #575 - DIY 1970s Spectrum Analyser
« Reply #15 on: February 01, 2014, 09:58:53 am »
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
 

Offline zucca

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Re: EEVblog #575 - DIY 1970s Spectrum Analyser
« Reply #16 on: February 01, 2014, 02:26:05 pm »
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....
Can't know what you don't love. St. Augustine
Can't love what you don't know. Zucca
 

Offline edpalmer42

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Re: EEVblog #575 - DIY 1970s Spectrum Analyser
« Reply #17 on: February 01, 2014, 02:45:09 pm »
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/

Ed
 

Offline lapm

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Re: EEVblog #575 - DIY 1970s Spectrum Analyser
« Reply #18 on: February 01, 2014, 10:29:19 pm »
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..
Electronics, Linux, Programming, Science... im interested all of it...
 

Offline electronics man

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Re: EEVblog #575 - DIY 1970s Spectrum Analyser
« Reply #19 on: February 01, 2014, 10:35:30 pm »
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
follow me on twitter @get_your_byte
 

Online Vgkid

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Re: EEVblog #575 - DIY 1970s Spectrum Analyser
« Reply #20 on: February 02, 2014, 03:27:25 am »
Thanks for the video, would it be possible to get more information on the SA?
If you own any North Hills Electronics gear, message me. L&N Fan
 

Offline richfiles

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Re: EEVblog #575 - DIY 1970s Spectrum Analyser
« Reply #21 on: February 02, 2014, 08:33:36 am »
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...
 

Offline w2aew

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Re: EEVblog #575 - DIY 1970s Spectrum Analyser
« Reply #22 on: February 03, 2014, 05:24:22 am »
Uh - oh!  Dave, hanging out with ham radio types!  Nice video, and very cool "real analog" spectrum analyzer.

Alan W2AEW
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Offline danielschroeder

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Re: EEVblog #575 - DIY 1970s Spectrum Analyser
« Reply #23 on: February 03, 2014, 02:17:30 pm »
What kind of oscilloscope is he using?
 

Offline Frost

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Re: EEVblog #575 - DIY 1970s Spectrum Analyser
« Reply #24 on: February 03, 2014, 04:01:16 pm »
What kind of oscilloscope is he using?

It's an  A.W. Sperry 620C, I think.
 


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