[ARC5] 28 volt high-current supplies?

[JAMES FALLS]

I knew a fellow who worked for the Highway Department locally. He’d scrounged several 28V (nominal) high amp transformers from traffic signal upgrades, about 6” on a side. They were on their way to the scrap dealer. Maybe get to know a city traffic engineer? 

I use my pair in over designed basic PSUs for my BC-375. One is in a PSU that feeds the PE-73 dynamotor. The other is half of a solid state LV/HV PSU. Both stay cool after an hour on the air. 

Jim Falls K6FWT 

> On Feb 17, 2022, at 18:43, Meir Ben-Dror WF2U <wf2u at ws19ops.com> wrote:
> 
> 
> I have 2 PP-8474G's. One is running my GRC-19 and the other replaced the original power supply (which has a problem I haven't addressed yet) in the GRC-142 shelter, for the GRC-106.
> I bought 2 24-28 VDC at 130 amps switching supplies - 240 vac input - on eBay some time ago ($60 each), that came out of a data center (probably for battery charging), which produce no RFI, so I use one for running the DY-17A for the ART-13, the other is a spare for now.
> I didn't notice that the 100 amp switcher on eBay I gave the link for, is cobbled up from 2 supplies...
> 
> 73, Meir WF2U
> Landrum, SC
> 
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>> On Feb 17, 2022, at 8:47 PM, J Mcvey <ac2eu at yahoo.com> wrote:
>> Raw SMPS are usually not suitable for radio power supplies. Espaecailly those cheap ones, which probably don't have any FCC compliance at all.
>> 
>> There are some decent military SMPS radio supplies out there like PP-8474G or the GEI24-RPA-T.
>> I have both . The latter is more modern and has better regulation . I had pigtail onnectors that are supposed to power radios in a rack, but I just use the charger output. 
>> 
>> On Thursday, February 17, 2022, 07:58:47 PM EST, Charles via ARC5 <arc5 at mailman.qth.net> wrote:
>> 
>> 
>> Thanks Meir, I saw that while searching... it's very obviously two 12 volt supplies wired in series without any diodes to avoid potential back-biasing during startup. Really professional job on the "24" sticker too (sarcasm).
>> 
>> There's a perfect transformer if I decide to go linear, and the weight doesn't matter... but they just want too much!
>> 
>> https://www.ebay.com/itm/165244216125
>> 
>> -Charles
>> 
>> 
>> 
>>> On 2/17/22 18:54, Meir Ben-Dror WF2U wrote: 
>> 
>> This one should do it... 
>> 
>> https://www.ebay.com/itm/24-Volt-100-Amp-DC-Power-Supply-2400-watts-/164935380985?mkcid=16&mkevt=1&_trksid=p2349624.m46890.l6249&mkrid=711-127632-2357-0 
>> 
>> 73, Meir WF2U 
>> Landrum, SC 
>> 
>> Get BlueMail for Android
>> On Feb 17, 2022, at 6:54 PM, Charles via ARC5 < arc5 at mailman.qth.net> wrote:
>> Looking for ideas on 24-28 volt supplies that won't break the bank. 
>> Shipping on big iron is REALLY expensive these days even if a suitably 
>> sized transformer can be found... Switching supplies from China aren't 
>> too bad. Two big batteries and a smaller charger to keep them up when 
>> not operating seems to be about the best compromise.
>> 
>> I'd like to be able to make 100 amps DC (which needs a 240 volt outlet, 
>> of course).
>> 
>> Any thoughts? thanks
>> 
>> -Charles
>> 
>> WB3JOK/0 since 1976
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