AE#7 Hewlett Packard 3585A Spectrum Analyzer repair

[@1959Berre]

I just happened to arrive on your channel. I like it. You have a relax way of explaining things and also a nice voice. On top of that, you seem to know what you are talking about, which is always nice. Good job!

[@t1d100]

Wonderful video. Great tutelage. Thank you for your huge efforts to share with us.

[@bloguetronica]

Nice teardown and repair of a beautifully made unit! Thanks for sharing!

[@fullwaverecked]

What a work of art Arti, no wonder it cost so much.

[@pa4tim]

A squarewave only has odd integer harmonics. The first harmonic is the base frequency self.

[@artifactelectronics]

You are right, of course. I just didn't think of the fundamental as the first harmonic.

[@markgilbert9930]

Nice repair, it will make a great coffee table.

[@BruceNitroxpro]

Mark... if you have a similar coffee table, I'll take it off your hands to use on my ham equipment. LOL

[@bloguetronica]

It is still a very valuable instrument! Better than most modern instruments.

[@pauldeboer]

While measuring the cap your meter indicated OL. This is not zero but OverLoad, it was clearly unable to measure the shorted capacitor.

[@jgeorge6081]

I just fixed one of these last year. I noticed you are getting a calibration error 2 and 4. My initial guess is that the 10mHz standard is not running or its disconnected. Otherwise the unit looks like it is in remarkable shape. Much better than the one I have, which was obviously dropped at some point.

[@milantrcka121]

m = milli; M = Mega

[@douro20]

I wish I could remember which late-60s HP instrument had a 3-phase brushless DC fan and dedicated circuitry for driving it.

[@felixcat4346]

Wow, that thing makes more noise than my Bugatti Veyron.

[@ElectricEvan]

Hands down the spectrum analyzer. The Pinto was "unsafe at any speed" to borrow a phrase.

[@johnbellas490]

looks like you are missing the 1 megohm input BNC connector on his unit, I use mine quite often but now I am curious to check those caps in the power supply that you replaced, I might replace the same caps in mine so I can prevent the same problem with mine should it be nearing that failure point. Interesting video though, BTW have you checked out Paul Carlsons lab on youtube? He has built a voltage clipping and input isolation device that is intended for use with THIS HP device, It will save your input circuitry on the analyzer from damage !! I have built two of them to protect the RF OUTPUT and RF INPUT on this device while I am working on vacuum tube equipment!! John A Bellas KC2UVN

[@artifactelectronics]

That's great advice. It's always the final details that allow a fine instrument to be fully restored.

[@BruceNitroxpro]

You beat me to it! You said the same thing I was going to say... LOL Paul has a LOT of bench time with this machine and he also has a MUCH greater lack of respect for ANY old caps... he just replaces them ALL. His secret weapon? A great desoldering iron/pump from Hakko. It pays for itself day after day. Old caps are the bane of any repair problem or program. If you don't do it first, you pay BIG time later.

[@teletype68]

Thanks for this great video. Can you please tell me the brand and type of the orange sleeve capacitors that you have used on the first power supply card? Thanks again,

[@artifactelectronics]

If I recall correctly they were just no name electrolytics, nothing special.

[@teletype68]

I just thought they could've been Sprague Atom. But indeed, this series is no longer available with an orange sleeve.

[@johnnywu5772]

Error code 2 happened how to repair ?

[@artifactelectronics]

I no longer own that instrument, but the service manual might be of some help explaining what the error code means.

[@paublusamericanus292]

gosh, I just discovered I would like to have a 1978 8535a hp spectrum analyzer. how do you attenuate the heck out of the input on this?

[@billmoran3812]

The multiples of the fundamental frequency are harmonics, not side bands.

[@ohmedarick1]

What PC based Spectrum Analyzer would you recommend for someone with tight budget. Thank you and I enjoy your videos.. A+++

[@MrRadioGypsy]

Sidebands? . . . . or, harmonics?

[@andymouse]

Great video...cheers.

[@georgethomas9436]

Just checked ebay. Lowest one is 600 dollars with 80 dollars ship. And it lights up but no display.

[@dgaborus]

One question: Why would anyone buy a spectrum analyzer that can go up to 40 Mhz only?

[@outerealm2439]

Low frequency and audio especially. This has a high dynamic range and is still able to be service down to the component level if needed. You would be amazed what this SA can do compared to others in a similar range. I own one.

[@1959Berre]

Maybe you need a cart.