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Author Topic: Source for 48-50VDC Supply  (Read 288 times)
KB0GU
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Posts: 130




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« on: July 20, 2004, 02:53:50 PM »

I am looking for a reasonably priced source for a 48-50 volt dc 30 to 40 amp power supply(ies) that could be used to power a solid state amplifier design I am working on.  Someone told me that photography uses such supplies maybe?  
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KZ1X
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Posts: 3228




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« Reply #1 on: July 20, 2004, 03:16:55 PM »

Telecom is the best / largest source.  LOTS of surplus available these days!!

http://www.valuesurplus.com always has prime, tested, high-quality stuff like this ... ham-owned, ham-run firm
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KR4BD
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Posts: 224




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« Reply #2 on: July 20, 2004, 03:22:32 PM »

I don't know if they would just sell it separately, but the power supply for the Ameritron ALS-600 Solid State HF Amp is 50vdc.  It is in a self contain, metered chasis separate from the actual amplifier.  Who knows, maybe they might sell just the power supply.  Depending on what they would want for it and how much you would pay, it might be worth a phone call to Ameritron (MFJ).  

Tom, KR4BD
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WB2WIK
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Posts: 20603




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« Reply #3 on: July 20, 2004, 03:24:14 PM »

I agree.  And for those unfamiliar with Telecom terminology, quite often a well-regulated/filtered power supply providing 1kW or more at 48Vdc is called, "a rectifier."  Seems like a nutty term for a regulated power supply, but in the Telecom industry where most equipment is actually powered by batteries and operates at 48Vdc, if they need to operate the same gear from the AC mains, they use "a rectifier," which typically is a high-powered regulated and filtered AC-in, DC-out supply providing 48V at a lot of current.  

Not unusual to see these in 100A+ ratings.

WB2WIK/6
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N6AJR
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Posts: 9908




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« Reply #4 on: July 20, 2004, 03:30:30 PM »

the power supply for the Ic 2kl is also in the 40 volt range, and I purchased a 20-45 volt 40 amp power supply from Ebay. do a search there, search for it a couple different ways, ( example power supply, power supplies, power supplys,)
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K6AER
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Posts: 3518




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« Reply #5 on: July 20, 2004, 04:01:03 PM »

You can obtain the power supplies at;

www.astrodyne.com
1 800 823-8082

Model number PSP1000-48 at $524 each. Gang the two power supplies togeather for your 40 amp output.
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KB8ASO
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Posts: 71




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« Reply #6 on: July 20, 2004, 05:01:04 PM »

Remember that some of the larger and older supplies were intended to be used with a battery bank.  They have very little filtering (if any) in them as the battery bank acted as the filter cap.  Of course the units not intended to be used with batteries have filter caps and are OK for what you are doing.  I maintained a phone switch several years ago that had 4 50A rectifiers float charging a 48 V, 2000 Ah battery bank.  There was no filtering in them and they were made circa 1980.  In my case recitfier was a better description for them than a power supply.

Randy AB9GO  
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KB8ASO
Member

Posts: 71




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« Reply #7 on: July 20, 2004, 05:02:28 PM »

p.s.  Almost forgot, they  were 208 V 3 phase.  
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KE4DRN
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Posts: 3725




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« Reply #8 on: July 20, 2004, 07:17:19 PM »

Hi Gene,

Look on ebay for a nice used Lambda brand power supply, many of these on auction for fraction
of the new cost.  Linear and switching types.

73 james

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