Re: RS 50 supply
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David
The RS50M seems like a nice supply. I'm planning on purchasing one as well. I've been using several linear supplies used for Drake TR7s as a stiff station 12V supply. They too work well, but I want to get some of the TR7s back on the air again, and need the supplies. I'm not sure whether I need a metered supply (as the supply will live under one of the benches) but they're nice units for sure. I think the Drake units are capable of 30-35 amps. Drake didn't skimp here! Regarding the danger, I suppose everything's dangerous in some way or another, but the most likely danger from this approach is a herniated disk, or squashed finger from hefting that thing around !! With common sense application care, there's certainly nothing inherently dangerous about a 50A LV power supply. 73 John K5MO _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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----- Original Message ----- From: <[hidden email]> To: <[hidden email]> Sent: Friday, August 19, 2005 8:20 AM Subject: [Elecraft] Re: RS 50 supply > David > > The RS50M seems like a nice supply. I'm planning on purchasing one as > well. I've been using > several linear supplies used for Drake TR7s as a stiff station 12V supply. > They too work well, ---------------------------snip-------------------------- Howdy John: If you purchase an Astron RS50M make sure it has a varistor in the power transformer primary winding. Upon power up my RM50 power supply kept tripping my circuit breaker....I called Astron and they said I needed a Varistor in the transformer primary....that supposedly would stop the supply from tripping the breaker. I ordered the varistor and installed it and have had no problems whatsoever since. I highly recommend this mod if your supply doesn't have it already installed. 73, Joe W2KJ I QRP, therefore, I am _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
Re: Re: RS 50 supply
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In reply to this post by john.brewer
On Friday 19 August 2005 12:20, [hidden email] wrote:
> David > > The RS50M seems like a nice supply. I was going to buy the RS35. When I went to my local dealer, I discovered that for ten more dollars I could have the VS35 - adjustable voltage, current limiting, voltage and current meters. I bought the VS35. Ian -- _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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Another slant. I went to buy a 50 Amp and bought a 70 Amp instead and now I
am covered for my entire station using a distribution strip for all equipment and never having to worry about not having enough. Remember the 50 is really 37 Amps continuous. Phil K2/KAT 100 Philip LaMarche LaMarche Enterprises, Inc. www.instantgourmetspices.com 727-944-3226 800-395-7795 pin 02 FAX 727-937-8834 NASFT #30210 W9DVM -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Ian Stirling, G4ICV, AB2GR Sent: Friday, August 19, 2005 12:18 PM To: [hidden email] Subject: Re: [Elecraft] Re: RS 50 supply On Friday 19 August 2005 12:20, [hidden email] wrote: > David > > The RS50M seems like a nice supply. I was going to buy the RS35. When I went to my local dealer, I discovered that for ten more dollars I could have the VS35 - adjustable voltage, current limiting, voltage and current meters. I bought the VS35. Ian -- _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Ian Stirling, G4ICV, AB2GR
Hi All,
I have the VS35M. The "M" means meters. I am constantly referring to them. Especially when I want to know if the KPA100 is doing its thing correctly at 100 W. Bought it in about 1992. Very reliable. Steve, W2MY -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Ian Stirling, G4ICV, AB2GR Sent: Friday, August 19, 2005 11:18 AM To: [hidden email] Subject: Re: [Elecraft] Re: RS 50 supply On Friday 19 August 2005 12:20, [hidden email] wrote: > David > > The RS50M seems like a nice supply. I was going to buy the RS35. When I went to my local dealer, I discovered that for ten more dollars I could have the VS35 - adjustable voltage, current limiting, voltage and current meters. I bought the VS35. Ian -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.338 / Virus Database: 267.10.13/78 - Release Date: 8/19/2005 _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Ian Stirling, G4ICV, AB2GR
Ian:
Agreed... and I use those features (all of them) all the time. Can't imagine how I managed to get along without the variable voltage/current and the meters for so many (previous) years... <G> I think they offer a VS50M as well, but I have no clue as to pricing. Cheers, Tom N0SS At 11:18 AM 8/19/2005, Ian Stirling, G4ICV, AB2GR wrote: >On Friday 19 August 2005 12:20, [hidden email] wrote: > > David > > > > The RS50M seems like a nice supply. > > I was going to buy the RS35. When I went >to my local dealer, I discovered that for >ten more dollars I could have the VS35 - >adjustable voltage, current limiting, >voltage and current meters. > I bought the VS35. > >Ian >-- > >_______________________________________________ >Elecraft mailing list >Post to: [hidden email] >You must be a subscriber to post to the list. >Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > >Help: http://mailman.qth.net/subscribers.htm >Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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I guess I should report that I have an RS-50A.
I find it to be a pretty nice analog PS overall. I found mine on Ebay and landed it for about $100 after shipping etc.. As luck would have it, the large filter capacitors were totally shot.. One had blown its guts out like a volcano all over the inside of the cabinet (previous owner probably hooked it to a variac?). The large (2 X 50,000ufd) caps are rated for only 25V and the rectifiers supply it with just over 22V so the RS-50 wont withstand much of an AC over voltage situation very well. There is a trimmer pot on a circuit board that allows tweaking the voltage up and down.. On mine, the board was mounted with the components pointing down so it was a bit hard to get to the trimmer.. I replaced the bad caps and mounted the board right side up so that the trimmer was easily accessible and tweaked it to put out exactly 13.8V. I have considered adding metering and variable voltage etc to it since the schematics show that it is very do-able for little expense but what the heck... it just sits under the bench and all I want from it is clean & stable 13.8VDC. I have not stressed it to see how stiff it is at high current loads but it is VERY stiff at the light loads. It has no fan so it is totally silent (very nice!) On the flip side, the output wiring is 10 gauge wire and the output connector is just a couple of bolts. To be honest the 10 gauge wire is home runned from two spots and I am pretty sure that it would be OK for 37 amps but.. I am not sure that doubled up 10 gauge wire and a pair of bolts would be my choice if I was truly going to draw 37 amps continuously 24X7. (the RS-50 is "rated" by the manufacturer at 37A). Duracomm sells some nice switching power supplies. I found a NIB DPS-55 power supply (13.8VDC 55 amp) on Ebay and landed it for about $90 after shipping. The output connectors on it are clearly designed for continuous duty at it's rated load. I measured the inside diameter of the holes that accept the output wires at .314 inch.. very adequate for 1 or 2 gauge wire.. I have not done much testing yet since I don't have anything that draws that much current. I can report that the output voltage was an impressively accurate 13.801 VDC right out of the box as measured on my Fluke 189 multimeter. It has a fan but it is supposed to only turns on when the temperature exceeds 115 F and the docs say that it generates "little" heat until 70% load, so I _guess_ the fan would not run very often below 38 amps. I know of a Broadcast engineer K6AER in Colorado who happily uses a DPS-75 (13.8VDC 75 amp) for all his 13.8V ham radio needs. So it is probably pretty clean. Ken Lotts aa7jc -----Original Message----- omitted _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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Ken, AA7JC wrote:
I know of a Broadcast engineer K6AER in Colorado who happily uses a DPS-75 (13.8VDC 75 amp) for all his 13.8V ham radio needs. So it is probably pretty clean. ---------------------------------------------- Ken raises a very good point about some DC supplies. They MAY get very noisy at low current loads! Some supplies that were purpose-designed for various gear depend upon a certain minimum current load for proper regulation and filtering. Using such a supply at a small fraction of its rated load may result in a lot of noise on the DC line and even poor regulation, depending upon the design. The Astrons and the like us Hams usually buy were designed to deliver clean DC from virtually zero Amps up to their full rated output, but that's not necessarily true of any DC supply. Ron AC7AC _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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