Vista XXX-R power supply.

Discussion in 'General Technical Questions and Answers' started by WB7DIE, Mar 25, 2008.

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  1. WB7DIE

    WB7DIE XML Subscriber QRZ Page

    I picked up a Vista power supply model XXX-R and can not find a reference to it on any web-site. It appears well made, heavy and is well regulated. Sure would like to locate a schematic or owners manual. Any one have an idea?? Thanks, Gary. (WB7DIE)
     
  2. W5GA

    W5GA Ham Member QRZ Page

    I didn't realize that Vista was so poorly designed that it required it's own power supply!!
     
  3. KV6O

    KV6O Premium Subscriber QRZ Page

    Vista sure is heavy, that's a fact. It takes a lot of power too. :D

    Sorry, never heard of a Vista PS, we're just having fun here :)

    If it's a linear supply, the schematic is probably pretty straight forward. You could probably draw it out on a piece of paper – a switch, fuse, transformer, rectifier, capacitor(s) and probably some regulation. The Astron supplies have published schematics and they are pretty standard in their design – good place to start.

    Now if it’s a switched, you’re going to need a schematic!

    Steve
    KV6O
     
  4. A71AN

    A71AN QRZ Member

    My friend, what sort of power supply you are refering to?

    Vista power supply ??? ( what is the rating of this power supply please ) ?

    73 my friend
     
  5. VE1IDX

    VE1IDX Ham Member QRZ Page

    Sorry I cannot help with a manual but I can tell you that I ran a Vista XXX-R power supply as a bench supply in the shop for many years and it was very good. It was well regulated and rated at 30 amps output which if I remember correctly was ICAS with a continous rating of 24 amps. Strange that I can find nothing on the net about it but with Bill Gates calling his latest version Vista the search engines are cluttered with computer related stuff.
     
  6. KG6YTZ

    KG6YTZ Ham Member QRZ Page

    Y'know, with a model "number" like that, I'm not surprised that it's difficult to find any related info on the 'net... :D The number of unrelated "matches" must be absolutely staggering.
     
  7. W9GB

    W9GB Ham Member QRZ Page

    Vista was a "brand name" for linear power supplies directed to the automotive/hobbyist market -- a few years ago. I have not seen "new models" for several years. Unless someone has a schematic diagram, you will have to use "reverse engineering" and available Astron schematics to help you determine "what is inside". The number of pass transistors on the heat sink is a good indicator of current capacity (amps) for the supply.
    I would highly suggest starting with Dave Metz's (WA0AUQ) article on the subject:
    http://www.repeater-builder.com/astron/pdfs/seits-astron-article.pdf

    Linear power supplies feature a large (heavy) transformer, bridge rectifier, a series of electrolytic capacitors (or a large cylinderical capacitor), an IC regulator [such as the LM723] and NPN pass transistors (2N3771, 2N3055, etc.) on an external heat sink.
    December 2005 QST article on linear power supplies:
    http://www.repeater-builder.com/astron/pdfs/qst-2005-december-power-supply-analysis.pdf

    These are relatively easy to repair and restore with an inexpensive DVM/VOM and some workbench time for proper troubleshooting. "shotgun" component replacement can get expensive and is often "overkill".

    START with the Repeater Builders Technical web page that is focused on linear power supply (Astron) construction and repair.
    http://www.repeater-builder.com/astron/astron-index.html

    w9gb
     
    Last edited: Mar 27, 2008
  8. AE5FD

    AE5FD QRZ Member QRZ Page

  9. NZ0T

    NZ0T Ham Member QRZ Page

    I just picked up a Vista XX-R which is a 20 amp supply. Puts out 13.8 volts just fine but has AC hum on a transmitted signal. I opened it up and some mods have been done so if anyone comes up with a schematice it would be very helpful.
    73
    Bill NZ0T
     
  10. AJ9ON

    AJ9ON Ham Member QRZ Page

    I have the same power supply, did you ever find a schematic on the net?

     
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