TSP

Поділитися
Вставка
  • Опубліковано 11 гру 2024

КОМЕНТАРІ • 85

  • @WillArtie
    @WillArtie 6 років тому +19

    Lol. "It's not very high freq. Only 3GHz..". Tell that to my hacked 1054z! Been mainly on audio this year, so 50k seems high to me! Thanks for the vid Shahriar.

  • @rfsniffer3175
    @rfsniffer3175 6 років тому +1

    The repair videos are the most valuable ones especially when you couple them with the theories involved.

  • @joes5669
    @joes5669 2 роки тому

    Ahhh the good old E4440. We still have several in our lab. There's something to be said for the OS in these devices compared to the new Windows boxes. Loved the switch tear down. Very valuable. Thank you.

    • @douro20
      @douro20 Рік тому

      They run HP-UX, don't they?

  • @TheRadioShop
    @TheRadioShop 6 років тому +1

    Very nice detail in construction of that relay. Thanks for sharing.

  • @movax20h
    @movax20h 6 років тому +1

    18:25 minor mistake. The pins at the right are not powering coil, these are outputs.

  • @Factory400
    @Factory400 6 років тому

    Surprised the relays are only $250.....that is a lot of work and takes a LOT of specialized skills, equipment, and fixtures to pull off.
    Excellent video....

  • @sivalley
    @sivalley 6 років тому +2

    Wow, for a machine from 1974 it's in VERY good condition! ;)

  • @Dyaxxis
    @Dyaxxis 6 років тому +2

    Great video, especially the detailed teardown of those relays.
    17:31 Hopefully that tool wasn't too expensive. I tend to use the "cheap" hobby style metal picks and/or probers on destroyed and/or non-sensitive devices so my more expensive tools may be spared. The Homer Simpson "Doh!" reference was a bit humourous though!

  • @ruhnet
    @ruhnet 5 років тому

    Great stuff! Thanks for sharing!

  • @darkoharamina7229
    @darkoharamina7229 6 років тому

    Hi, very good video, speed down video.... your usual speed is perfect.

  • @movax20h
    @movax20h 6 років тому +1

    Nice video. Could you make a dedicated video about just RF switching, relays, solid state switches, and maybe directional copulers.

  • @pu1ypj
    @pu1ypj 6 років тому +16

    Please! Simulate that relay in a software. I'd love to see how this is done.

  • @rfsniffer3175
    @rfsniffer3175 6 років тому +1

    A noise figure analyzer tear down would be great!

  • @WaltonPete
    @WaltonPete 6 років тому +1

    Interesting to see inside the relay. You can see why they were so expensive, what with the machined housing and other precision parts. I wonder if they could be manufactured additively (using laser sintering or some other 3D process) to make them cheaper? It's the sort of thing 3D printing excels at, making small numbers of highly specialised components.

    • @movax20h
      @movax20h 6 років тому

      The machining isn't that expensive, it also produces nice smooth edges and surfaces. 3d printing isn't necassiarly as good (the cavity where switches are might be tolerance critical), and it might be significantly slower if producing them one by one. It is also possible they do have some precasting first to get close to shape, and then just machine cavities. I think it is the case because, the external surfaces, and the coil cavity are not that smooth, and because they used some weird alloy of aluminium, magnezium or zinc, as seen from the cristaline structure of chips. But you could probably manufacture additively in bigger machine and manufacture lets say 100 or 150 at the same time. The problem with sinteing is that you also need to control dimensional changes during sintering process very precisely. The main cost is really in the fact that these are relatively specialized and low volume devices, and main cost is actually in design and testing, not manufacturing.

  • @AF6LJSue
    @AF6LJSue 6 років тому

    Good stuff, thanks for posting this.

  • @askild_eide
    @askild_eide 6 років тому

    Thanx for continuing to deliver quality videos! Of all the "technical yuotube vids" I watch, yours is a separate league when it comes to WAF (Wife Acceptance Factor ((she's an art historian))), so I usually can watch yours whenever i discover a new one :)
    I think I have watched most of your videos now, but only started supporting you on patreon a few months ago... But I have a request, it might be difficult to make a long video, and you have already touched the subject, but if we look at instruments today and back to, lets say 80's or even 70's, the change have for spectrum analyzers have been from all analog to the digital part have moved forward in #the signal path#, and switches has gone from mechanical to solid state, and amplifiers has gone from discrete to IC or MMIC, but one ( or two) major parts has not changed.... The YIG oscillator and YIG tuned filters!
    I think the inventors and the technology really deserves more attention, not many inventions lasts so long with no other technology even being close.. (as far as my knowledge reach:)
    Would you consider this as a tribute to those that made all that we love possible?

  • @cat637d
    @cat637d 6 років тому

    Very interesting and FUN!

  • @ebb2421
    @ebb2421 6 років тому

    interesting experiment to implement some solid state rf switches in place of the relays...

  • @timun4493
    @timun4493 6 років тому +1

    those slots on the controller board look like GSC, i couldn't find a release date for the instrument but from the way the board looks i would expect a PA-RISC 7100LC under the heatsink

    • @timun4493
      @timun4493 6 років тому

      so probably an hp-ux variant rather than linux

  • @philippoMC
    @philippoMC 6 років тому +3

    Could you make a video on simulating RF cavities? That would be very interesting.

  • @roymercer9065
    @roymercer9065 6 років тому

    That was interesting and very well done. Thank you sir.

  • @garybevis8691
    @garybevis8691 4 роки тому

    HI Shahriar, I had an idea about a way to remove the back cover on the relay, rather than using a ball end tool for Dremel. I think you could use a vertical mill (Bridgeport type) with end cutting tool. If you position the relay orient back cover up in a vice, perpendicular of the tool, carefully mill down the cover to the surface of the mono-block housing. Effectively removing the cover and epoxy. Subsequent, I think you could do the work on the switch contacts and glue a cover fashioned from same type material, such as aluminum. Good luck and best wishes for further project such as things like this.

  • @filipamator
    @filipamator 4 роки тому

    We had in our lab one of those PSA analysers with upper freq. limit at 6.7 GHz. One day I discovered that we can go up to 26 GHz.. the battery was dead and it seem that the instrument forgot about its configuration!

  • @DeeegerD
    @DeeegerD 6 років тому

    $250 each! I'd have told Agilent (or whatever they call themselves this week) that they were out of their minds! Glad it worked. $500 is my budget for an analyzer ;) (maybe used?)

    • @MarkFunderburk
      @MarkFunderburk 6 років тому +3

      although I don't think it was too bad considering one of those units used cost as much as my car did new.

  • @electronic7979
    @electronic7979 6 років тому

    Useful video

  • @michaelnobibux2886
    @michaelnobibux2886 6 років тому +1

    Relays that switch low level ac/rf can fail like this.A solution that is sometimes used is called 'dc wetting' ,whereby the signal is superimposed on a few milliamps of dc.

  • @galileo_rs
    @galileo_rs 6 років тому +2

    Common trick in HAM radio gear with intermittent relay issues like this was to inject some DC.

    • @kissingfrogs
      @kissingfrogs 6 років тому +1

      and a similar trick used to bring old telephone lines back to life

    • @galileo_rs
      @galileo_rs 6 років тому

      Didn't know that, nice :)

  • @maxsnts
    @maxsnts 6 років тому +5

    Hi. Nice video. Out of curiosity, any good 3d Simulator on the free/open side of software?

  • @sefarkas0
    @sefarkas0 6 років тому +2

    Since the other two are bad, would it be possible to try drilling a tint hole through the back and injecting cleaner through it, it may take a long time to dry or maybe two holes.

    • @michaelnobibux2886
      @michaelnobibux2886 6 років тому

      Steve Farkas
      This might not be a good idea,as some debris may fall inside. Also rf relays are sometimes sealed and pressurized with dry nitrogen!!!

  • @Henning_Rech
    @Henning_Rech 3 роки тому

    This preamp module looks a bit overengineered for its 3 GHz bandwidth. Maybe part of it - around the relays - is identical to the full span preamp.

  • @btouw8558
    @btouw8558 6 років тому

    Always Interesting, bit short

  • @valakatz3967
    @valakatz3967 5 років тому

    Great video thank you for your share info. Need to change the battery in my E4406A, any advised would be appreciated, thanks

  • @mattnottingham3663
    @mattnottingham3663 6 років тому +4

    Are you going to take a look at the Siglent SVA1015X in the near future? Its an interesting price point.

    • @movax20h
      @movax20h 6 років тому

      It is pretty expensive with all options in. I still think it is overpriced for what it is, but the truth is, it is priced better than competition. So hopefully prices will lower in few years, market would grow too, which would allow price to lower further.

    • @mattnottingham3663
      @mattnottingham3663 6 років тому

      With its current frequency range it's of no use to me. I just hope its the start into the (low-end) VNA market which they build on.

    • @douro20
      @douro20 5 років тому

      @@mattnottingham3663 Still can't think of a better VNA for the price than what Deepace makes. They also make very good training kits for microwave network analysis.

    • @mattnottingham3663
      @mattnottingham3663 5 років тому

      @@douro20 The Deepace one isn't made anymore. It'll be interesting to see what Harmon Instruments come up with.

    • @douro20
      @douro20 5 років тому

      @@mattnottingham3663 www.deepace.net/shop/kc901v/

  • @kirkpennock2997
    @kirkpennock2997 6 років тому +3

    Drill a tiny hole in switch cover, squirt some deoxit in, cycle a lot?

    • @kirkpennock2997
      @kirkpennock2997 6 років тому

      But will the cleaner affect the freq response? Beyond me. It would be an interesting thing to test.

    • @PlasmaHH
      @PlasmaHH 6 років тому +1

      In my experience the failure mode is more often the deformation and thus wrong contact pressure rather than oxidizations, especially since those things are generally gold coated and sealed very well

    • @JlerchTampa
      @JlerchTampa 6 років тому +1

      Drill a hole, use the new hole to pressurize the cavity to remove the lid, fill the hole, clean the things, re-assemble?

    • @jfbeam
      @jfbeam 6 років тому

      Except that's not why it failed. The springs wear out, and the contact area deforms.

    • @movax20h
      @movax20h 6 років тому

      The problem is small metal particles will get into switch, and possibly short contacts. :/
      Also I do not think it is oxidation. All touching parts are gold coated, and it appears to be hermetically sealed. Would be better if filled with nitrogen, but even without that, there is not much oxidation that can there. Most likely the metalic strips deformed, making it not make enough pressure to maintain good contact.

  • @glasslinger
    @glasslinger 3 роки тому

    I would like to see that analyzer looking at a signal at the low end of the range, say 20 hz or even 10 hz. This seems impossible to me! Magic!

  • @liviococcia
    @liviococcia 6 років тому

    I like watching all these great teardown and repair videos, even though I have a very very basic rudimentary knowledge of electronics, so thank you for creating them. I am always trying to learn, and pick up basic principles of how electronic components work, and how a peice of equipment functions. I have a question about the battery testing which I have no understanding of though please, when you tested the bios battery cell you placed the positive and negative lead onto the negative side of the battery, why is this? (I always assumed that the DVM positive lead should go on the positive side, and the negative lead on the negative side to give the cells Volts DC value), thanks again

    • @atta30
      @atta30 3 роки тому +1

      If you reverse Polarity on a dvm you just get a negative voltage you could measure 3 volts or -3 volts by swapping the polarity but either way it tells you 3 volts

  • @twoody2148
    @twoody2148 6 років тому

    now that you know how its constructed and its spectrum profile would it be possible to use a solid state relay as a replacement or even a quality transistor ?

  • @WisdomVendor1
    @WisdomVendor1 6 років тому +1

    The vid somehow seems incomplete without a Pooch appearance :)

  • @douro20
    @douro20 4 роки тому

    What was the lead time on those RF switches?

  • @morto360
    @morto360 6 років тому

    Just came to leave a like, ill watch the video later with a cold beer!

  • @armandoleantesanabria8355
    @armandoleantesanabria8355 3 роки тому

    Hello nice job
    I have just question, i have advantest r3465 which didnt retain date or config after boot, so i guess battery is dead, however is any risk on erase the calibration or it just storage config?
    Thanks for your content

  • @vidasvv
    @vidasvv 6 років тому

    Thanks for another GREAT video !
    73 N8AUM

  • @OneBiOzZ
    @OneBiOzZ 6 років тому

    "why spend so much on a single relay and LNA" several people have been saying ... its all in the calibration

  • @movax20h
    @movax20h 6 років тому

    How long it took manufacture to make them for you from the time of first contact?

  • @movax20h
    @movax20h 6 років тому +1

    "Fairly low frequency, it is just 3GHz"

  • @dtiydr
    @dtiydr Рік тому

    3Hz.. how do they even do it.

  • @JLSoftware
    @JLSoftware 6 років тому

    Those mechanical relays go at 3 gHz? Somebody clarify this.

    • @Thesignalpath
      @Thesignalpath  6 років тому

      Yes, those are 3GHz relays.

    • @theondono
      @theondono 6 років тому +1

      Almost 170$/GHz 🤣

    • @paulpillau5858
      @paulpillau5858 6 років тому +4

      That does not mean that they are switching at 3 GHz though. If that is the question...

    • @risfutile
      @risfutile 6 років тому +4

      JL Software the relay carries signals up to 3GHz. it's not switching the contacts at 3GHz.

    • @ciano5475
      @ciano5475 6 років тому +2

      Correct me if I'm wrong, but what I understand is that the amplifier has 3GHz of bandwidth, but in bypass, the relay has the full signal and the full bandwidth of the instrument (26.5GHz).

  • @gacherumburu9958
    @gacherumburu9958 2 роки тому

    👍👍

  • @LevonAvagyan
    @LevonAvagyan 6 років тому +10

    And i thought audiophile stuff is overpriced! 250$ for one relay!

    • @allesklarklaus147
      @allesklarklaus147 6 років тому +9

      The same relay for audiophile applications probably cost you 3 grand

    • @dtiydr
      @dtiydr 6 років тому +4

      250$ for a relay with as little loss as possible and custom made to spec.. I would have expected way more.

    • @allesklarklaus147
      @allesklarklaus147 6 років тому +3

      dtiydr Yeah but it's old and probably not used anymore. However, with prices of 2000$ for a shielded "audio grade" powercable... The relay is way too cheap.

    • @dtiydr
      @dtiydr 6 років тому

      Perhaps, but just the fact that they could still be made by request say me they are not necessary discontinued.
      Yea I have seen those cables had to be pure gold in those, way overpriced so say the least.

    • @allesklarklaus147
      @allesklarklaus147 6 років тому

      dtiydr Yeah it's probably just recycled chinese copper but it's shielded so awesomely! Because, powercable

  • @ernestb.2377
    @ernestb.2377 Місяць тому

    Although these and similar videos are of great value for those who want to learn, as the most of the viewers can't afford these machines (even 'for parts only' worth thousands of $), and I know you are doing high-tech and these are your daily tools, a lot of your public are RF enthousiasts. So I would suggest a series of videos where you compare real budget equipment, like the owons, rigols, siglents, and such. Maybe also, second-hand older established brands too, but with an affordable budget of say 1, 2 and max 3k. I would like to know/learn what limits these budget machines have and why. How they compare to the specs of a more expensive equipment, and is it worth buying. For example, Owon XSA 815-TG is now on sale for about 735,- euro. Even a video where you compare the specs and explain those would be valuable for us starting RF enthousiasts. Explaining where to pay attention and what the common pitfalls are. Don't get me wrong, your videos are obviously very popular, for a reason. Thanks for taking the time 👍

  • @SLOWOLITUS
    @SLOWOLITUS 6 років тому

    Reed contact would we better

    • @michaelnobibux2886
      @michaelnobibux2886 6 років тому

      SLOWOLITUS
      Reed contacts have high RFskin resistance!!!