N2CQ QRP Contest Calendar: Aug 18 - Sep 19, 2005
Locked
N2CQ QRP Contest Calendar: Aug 18 - Sep 19, 2005
 
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
N2CQ QRP CONTEST CALENDAR August 18 to Sept 19, 2005 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Summer FOX Hunt - QRP 20M CW UTC: Every Fri thru August 19, 0100z to 0229z EDT: Every Thur thru August 18, 9 PM to 1029 PM Info: http://www.cqc.org/fox/summer_rules.htm ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ SARTG WW RTTY Contest ... Low Power Category Aug 20, 0000z to 0800z Aug 20, 1600z to 2400z Aug 21, 0800z to 1600z Rules: http://www.sartg.com/contest/wwrules.htm ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ QRP ARCI Silent Key Memorial Contest (CW) *** QRP CONTEST! *** Aug 20, 1500z to 1800z Rules: http://www.qrparci.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ BUBBA Summer QRP Sprint *** QRP CONTEST! *** Aug 20, 1600z to 2200z Rules: http://www.azscqrpions.org/BUBBA2005_08102005.htm ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ North American QSO Party (SSB) ... 100W Max. (/QRP noted on entry) Aug 20, 1800z to Aug 21, 0600z Rules: http://www.ncjweb.com/naqprules.php ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ NJ QSO Party (CW/SSB) Aug 20, 2000z to Aug 21, 0700z Aug 21, 1300z to Aug 22, 0200z Rules: http://www.qsl.net/w2rj/ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ RUN FOR THE BACON (CW) *** QRP CONTEST! *** Aug 22, 0100z to 0300z Rules: http://fpqrp.com ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Hawaii QSO Party (CW/SSB/Digital) ... QRP Category Aug 27, 0700z to Aug 28, 2200z Rules: http://www.karc.us/hi_qso_party.html ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ TOEC WW Grid Contest (CW) ... Low Power category Aug 27, 1200z to Aug 28, 1200z Rules: http://www.qsl.net/toec/contest.htm ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Ohio QSO Party (CW/SSB) ... QRP Category Aug 27, 1600z to Aug 28, 0400z Rules: http://www.oqp.us/ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ SLOVENIA CONTEST CLUB RTTY Championship .. 100W Category Aug 27, 1200z to Aug 28, 1159z Rules: http://lea.hamradio.si/~scc/rtty/htmlrules.htm ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Kentucky QSO Party (CW/SSB) Aug 28, 1600z to Aug 29, 0400z Rules: http://www.ky4ky.com/kyqsopartyrules.html ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ QRP BARBERSHOP QUARTET CONTEST (CW QRP)... QRP Contest! Aug 31, 2100 EDT to 0300 EDT Rules: http://www.io.com/~n5fc/barbershop_contest.htm ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Wake-Up! QRP Sprint (CW) *** QRP Contest *** Sep 03, 0400z to 0600z Rules: http://www.qrp.ru/sprint_e.htm ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ IARU Region 1 Fieldday (SSB)... QRP Category Sep 03, 1300z to Sep 04, 1300z Rules: http://www.sk3bg.se/contest/iarur1fd.htm ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ AGCW Straight Key Party (CW - 40 Meters) ... QRP Category Sep 03, 1300z to 1600z Rules: http://www.agcw.de/english/contest/htp_e.htm ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Michigan QRP Labor Day Sprint (CW) *** QRP CONTEST! *** Sep 05, 2300z to Sep 06, 0300z Rules: http://www.qsl.net/miqrpclub/contest.html ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Adventure Radio Spartan Sprint (CW) *** QRP CONTEST! *** Sep 06, 0100z to 0300z (First Monday 9 PM EDT) Rules: http://www.arsqrp.com/ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Worked All Europe DX Contest (SSB) 100W Power Category Sep 10, 0000z to Sep 11, 2400z Rules: http://www.darc.de/referate/dx/fedcw.htm ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Swiss HTC QRP Sprint (CW) *** QRP Contest *** Sep 10, 1300z to 1900z Rules: http://www.htc.ch/ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Arkansas QSO Party (CW/SSB/PSK31) ... QRP Category Sep 10, 1400z to Sep 11, 0600z and Sep 11, 1800z to Sep 12, 0200z Rules: http://zinfoserv.com/arkan/qso_party.php ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ARRL September VHF QSO Party (All) Low Power Category Sep 10, 1800z to Sep 12, 0300z Rules: http://www.arrl.org/contests/calendar.html?year=2005 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Second Class Operator Club Marathon (CW) *** QRP Contest *** Sep 10, 1800z to 2400z Rules: http://www.arrl.org/contests/months/sep.html ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ NA Sprint (CW)... QRP Category Sep 11, 0000z to 0400z Rules: http://www.ncjweb.com/sprintrules.php ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Tennessee QSO Party (SSB/CW/Dig) ... Qrp Category Sep 11, 1800z to Sep 12, 0100z Rules: http://www.k4ro.net/tcg.html ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ End of Summer PSK31 Sprint *** QRP Contest *** Sep 11, 2000z to 2400z Rules: http://www.qrparci.org/contest.htm ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ PODXS 070 Club 80m Autumn Sprint (PSK31) ... QRP Category Sep 16, 2000 Local to 0200 Local Rules: http://podxs.com/html/070_club.html ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Scandinavian Activity Contest (CW) ... QRP Category Sep 17, 1200z to Sep 18, 1200z Rules: http://www.nrrl.no/7_english/Docs/sac_rules.htm ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ South Carolina QSO Party (ALL) ... QRP Category Sep 17, 1300z to Sep 18, 2100z Rules: http://www.kf4ghc.net/scqp.shtml ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ QRP Afield (All) *** QRP Contest *** Sep 17, 1500z to Sep 18, 0300z (Enter your best 6 hours) Rules: http://www.qsl.net/wq1rp/ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Washington State Salmon Run (CW/SSB) ... QRP Category Sep 17, 1600z to Sep 18, 0700z Sep 18, 1600z to Sep 18, 2400z Rules: http://www.wwdxc.org/salmonrun/rules.htm ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ NA Sprint (SSB)... QRP Category Sep 18, 0000z to 0400z Rules: http://www.ncjweb.com/sprintrules.php ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ RUN FOR THE BACON (CW) *** QRP CONTEST! *** Sep 19, 0100z to 0300z Rules: http://fpqrp.com [0100z on the Monday after the Third Sunday] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Thanks to SM3CER, WA7BNM, N0AX(ARRL), WB3AAL and others for assistance in compiling this calendar. Please foreward the contest info you sponsor to [hidden email] and we will post it and give it more publicity. Anyone may use this "N2CQ QRP Contest Calendar" for your website, newsletter, e-mail list or other media as you choose. (Include a credit to the source of this material of course.) 72 de Ken Newman - N2CQ [hidden email] http://www.amqrp.org/contesting/contesting.html http://www.n3epa.org/Pages/Contest/contest.htm _______________________________________________ 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 |
|
|
Does anyone know what the power supply requirements are going to be for
the elecraft amp when it is ready for sale? I have to replace mine now and figure I might as well buy one big enough to handle it as I plan to get one when it becomes available. _______________________________________________ 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 |
|
|
I seem to remember that it weighed a ton or two - either it had a dirty
great big PSU built in or my mind is off on a jaunt of its own again. Looked absolutely brilliant, drool factor was very high. Simon Brown --- www.hb9drv.ch www.laax.ch RSGB HF Convention: Friday 7th - Sunday 9th October 2005 Holidays: Monday 10th - Thursday 20th October 2005 ----- Original Message ----- From: "David" <[hidden email]> > Does anyone know what the power supply requirements are going to be for > the elecraft amp when it is ready for sale? > I have to replace mine now and figure I might as well buy one big enough > to handle it as I plan to get one when it becomes available. > _______________________________________________ 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 |
|
|
If I remember correctly the power supply is included. It is a switching
supply. With the smaller amp it is built-in. With the larger amp it is external. N2TK, Tony -----Original Message----- From: [hidden email] [mailto:[hidden email]]On Behalf Of Simon Brown (HB9DRV) Sent: Thursday, August 18, 2005 10:29 AM To: David; [hidden email] Subject: Re: [Elecraft] New amp I seem to remember that it weighed a ton or two - either it had a dirty great big PSU built in or my mind is off on a jaunt of its own again. Looked absolutely brilliant, drool factor was very high. Simon Brown --- www.hb9drv.ch www.laax.ch RSGB HF Convention: Friday 7th - Sunday 9th October 2005 Holidays: Monday 10th - Thursday 20th October 2005 ----- Original Message ----- From: "David" <[hidden email]> > Does anyone know what the power supply requirements are going to be for > the elecraft amp when it is ready for sale? > I have to replace mine now and figure I might as well buy one big enough > to handle it as I plan to get one when it becomes available. > _______________________________________________ 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 |
|
|
In reply to this post by David-470
Thanks everyone I have the answers I need and I am now planning to
purchase an rs50m for my shack -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of David Sent: Thursday, August 18, 2005 9:37 AM To: [hidden email] Subject: [Elecraft] New amp Does anyone know what the power supply requirements are going to be for the elecraft amp when it is ready for sale? I have to replace mine now and figure I might as well buy one big enough to handle it as I plan to get one when it becomes available. _______________________________________________ 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 |
Power Supply (WAS: New amp)
|
|
David wrote:
Thanks everyone I have the answers I need and I am now planning to purchase an rs50m for my shack ----------------------- A few things to consider: 1) A 20 amp power supply will run the K2/100 with current to spare. My K2/100 runs 16 to 18 amps from my Astron 20M. 2) Large supplies (even the 20 am, but especially one like a 50 amp) can be very dangerous! While you won't get a shock from 13 vdc, they require all the care you'd exercise working with an automobile battery. Shorts can cause instant fires. Hot, molten metal spraying, splattering and dribbling all over the place from a short can burn lots of holes in things, including your own body and eyes. Shorts tend to become instantly welded in place and if it's not good enough to cause the crowbar circuit to trip, the power supply will keep dumping current into the circuit. An RS 50 supply will dump 50 amps into a 0.3 ohm short nonstop. Fuse everything and be careful just the same. 3) You might get more amps for your buck by buying two or three smaller supplies than one big supply, and thereby be less likely to experience a total failure if a supply dies on you. 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 |
Re: Power Supply (WAS: New amp)
|
|
Ron D'Eau Claire wrote:
>David wrote: >Thanks everyone I have the answers I need and I am now planning to purchase >an rs50m for my shack > >----------------------- > >A few things to consider: > >1) A 20 amp power supply will run the K2/100 with current to spare. My >K2/100 runs 16 to 18 amps from my Astron 20M. > >2) Large supplies (even the 20 am, but especially one like a 50 amp) can be >very dangerous! While you won't get a shock from 13 vdc, they require all >the care you'd exercise working with an automobile battery. Shorts can cause >instant fires. Hot, molten metal spraying, splattering and dribbling all >over the place from a short can burn lots of holes in things, including your >own body and eyes. Shorts tend to become instantly welded in place and if >it's not good enough to cause the crowbar circuit to trip, the power supply >will keep dumping current into the circuit. An RS 50 supply will dump 50 >amps into a 0.3 ohm short nonstop. Fuse everything and be careful just the >same. > >3) You might get more amps for your buck by buying two or three smaller >supplies than one big supply, and thereby be less likely to experience a >total failure if a supply dies on you. > >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 > > > I have been using an RS-50M for quite a while now. Very reliable and built to last. Nothing scarry about it. Yes, you do need to be aware of what you are using and take all the precautions. Tony W7GO _______________________________________________ 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: Power Supply (WAS: New amp)
|
|
In reply to this post by Ron D'Eau Claire-2
Not to take issue with Ron's comments... they are all appropriate, however
one thing I think which may have been missed, or at least glossed over, is the fact the Astron supplies include a very good FOLDBACK CURRENT LIMITING circuit which, if directly shorted (e.g. HOT lead directly to GND) will instantly reduce the output current (and the voltage) to nearly zero with little or no damage to the supply, the attached equipment, OR to the cabling (or user). This having been said, as with just about any P/S which included this type of current limiting, if only a partial short (e.g. low resistance, but not quite a dead short) appears across the output, the P/S will attempt to provide as much current as it can.. until it reaches that 'trip point' internally set at which it then thinks it sees a dead short and reverts the foldback current limiting. So, if you place a really heavy load across such a p/s, it WILL try to honor your request, so to speak. All too often, I've (accidently) shorted together the "+" and "-" leads of my Astron VS35M (35A) supply. The only thing I hear is a momentary 'tick' when the wires touch, and the I see the voltage and current drop to zero... removing the short brings everything back to normal. This is definitely NOT something you'd want to do with a P/S you weren't ABSOLUTELY CERTAIN has foldback current limiting. For, as Ron stated so eloquently, BAD THINGS CAN (AND WILL) HAPPEN!!! 73, Tom Hammond N0SS At 12:51 PM 8/18/2005, Ron D'Eau Claire wrote: >David wrote: >Thanks everyone I have the answers I need and I am now planning to purchase >an rs50m for my shack > >----------------------- > >A few things to consider: > >1) A 20 amp power supply will run the K2/100 with current to spare. My >K2/100 runs 16 to 18 amps from my Astron 20M. > >2) Large supplies (even the 20 am, but especially one like a 50 amp) can be >very dangerous! While you won't get a shock from 13 vdc, they require all >the care you'd exercise working with an automobile battery. Shorts can cause >instant fires. Hot, molten metal spraying, splattering and dribbling all >over the place from a short can burn lots of holes in things, including your >own body and eyes. Shorts tend to become instantly welded in place and if >it's not good enough to cause the crowbar circuit to trip, the power supply >will keep dumping current into the circuit. An RS 50 supply will dump 50 >amps into a 0.3 ohm short nonstop. Fuse everything and be careful just the >same. > >3) You might get more amps for your buck by buying two or three smaller >supplies than one big supply, and thereby be less likely to experience a >total failure if a supply dies on you. > >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 _______________________________________________ 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: Power Supply (WAS: New amp)
|
|
Tom wrote:
one thing I think which may have been missed, or at least glossed over, is the fact the Astron supplies include a very good FOLDBACK CURRENT LIMITING circuit which, if directly shorted (e.g. HOT lead directly to GND) will instantly reduce the output current (and the voltage) to nearly zero with little or no damage to the supply, the attached equipment, OR to the cabling (or user). --------------------------------------------------- Quite true, Tom. And that's why I said one must be careful with a high-current supply. It's a lot harder to trip that crowbar circuit on a big supply! As I pointed out, a 13.8 volt, 50 amp supply will deliver full current into a 0.3 ohm load WITHOUT OVERLOADING! That's 690 watts that can cause a lot of heat in short order, and it won't even trip the crowbar. Where I've found some ops get a nasty surprise is that they've become used to seeing the crowbar kill the output when they accidentally short out a 5 or 10 amp supply, but when they do that with a bit of solder or wire on a 50 amp circuit, they're met with a face full of molten copper, solder or whatever it was that got across the circuit and the power supply barely hums... 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 |
|
|
In reply to this post by Ron D'Eau Claire-2
That's what I have done here. I have a 20 amp VJ Products and a
RS-35 Astron. I have them in parallel and fed in to a home brewed distribution box. I had often wondered if the difference in current rating would create any problem. Also, I have never checked to see if they both have exactly the same output voltage. Would either of the above present any problems? Stan Rife W5EWA Houston, TX K2 S/N 4216 -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Ron D'Eau Claire Sent: Thursday, August 18, 2005 12:51 PM To: 'David'; [hidden email] Subject: [Elecraft] Power Supply (WAS: New amp) David wrote: Thanks everyone I have the answers I need and I am now planning to purchase an rs50m for my shack ----------------------- A few things to consider: 1) A 20 amp power supply will run the K2/100 with current to spare. My K2/100 runs 16 to 18 amps from my Astron 20M. 2) Large supplies (even the 20 am, but especially one like a 50 amp) can be very dangerous! While you won't get a shock from 13 vdc, they require all the care you'd exercise working with an automobile battery. Shorts can cause instant fires. Hot, molten metal spraying, splattering and dribbling all over the place from a short can burn lots of holes in things, including your own body and eyes. Shorts tend to become instantly welded in place and if it's not good enough to cause the crowbar circuit to trip, the power supply will keep dumping current into the circuit. An RS 50 supply will dump 50 amps into a 0.3 ohm short nonstop. Fuse everything and be careful just the same. 3) You might get more amps for your buck by buying two or three smaller supplies than one big supply, and thereby be less likely to experience a total failure if a supply dies on you. 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 _______________________________________________ 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 |
|
|
Stan,
If the voltages are ALWAYS exactly the same, you could be OK, but if the voltage sags on either supply, the one with the higher voltage will try to feed into the lower voltage supply just as if it were another load. What happens next depends on the exact power supply design. I would surmise that for one thing, connecting two supplies in parallel will possible defeat the foldback current limiting. It would be much better and safer IMHO to use 2 distribution boxes - unless you have one piece of gear that requires more current than the Astron can handle by itself. If I were going to attempt to parallel 2 supplies, I would check that the design (mainly the protection circuits) allows them to work together properly and definitely would NOT attempt to parallel 2 different supplies. 73, Don W3FPR > -----Original Message----- > From: [hidden email] > [mailto:[hidden email]]On Behalf Of Stan Rife > Sent: Thursday, August 18, 2005 6:57 PM > To: [hidden email] > Subject: RE: [Elecraft] Power Supply (WAS: New amp) > > > That's what I have done here. I have a 20 amp VJ Products and a > RS-35 Astron. I have them in parallel and fed in to a home brewed > distribution box. I had often wondered if the difference in current rating > would create any problem. Also, I have never checked to see if they both > have exactly the same output voltage. Would either of the above > present any > problems? > > > Stan Rife > W5EWA > Houston, TX > K2 S/N 4216 > > > No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.338 / Virus Database: 267.10.10/73 - Release Date: 8/15/2005 _______________________________________________ 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 |
«
Return to Elecraft
|
1 view|%1 views
| Free forum by Nabble | Edit this page |