Another example of "reading the manual" or in this case the "info sheet".
I have run Basecom20 for a 50w VHF-FM radio for up to ten years onboard 200-foot oil field work boats. I did have one "croak" but that might have been due to the highly regulated (joke) ships generator: 115vac +/- 50vac! Ten years in continuous duty is not bad. These look to be re-labeled Astron RS-20 PS and have been supplying multiple radios on a boats. 250w => 18 amps. A 150w marine SSB will have a dc load of about 250w. I use a 50A Tait PS (14.1 vdc) to power my home station 12volt needs. The No. 6 welding wire supply line is fused at 30A at the radio table distribution point. Been in service for about 9 years. This is a re-labeled Astron VM-50. So, yes, I derate them about 60% for long-term service. Ed - KL7UW At 06:16 AM 7/3/2011, Eugene Balinski wrote: >All, > > Please be advised that Astron supplies are generally >over rated. The RS-20 is rated at 20A peak and 16A >continuous. It is more like 12 -14 continuous. I have >seen people try to use them at their "continuous" ratings, >only to have them fail. The heat sinking is just not >there. Be careful when using any of the supplies at their >top ratings. If you need to use one at rated, then put a >good fan on the heat sink. > > >73 >K1NR > > > >On Sun, 03 Jul 2011 00:17:46 -0800 > "Edward R. Cole" <[email protected]> wrote: > > I sure Elecraft can answer this better. I would make a > > guess that > > power supplies in much equipment is bought from a vendor > > and > > installed as a module; the vendor having taken care of > > all necessary > > certifications. Perhaps in high volume production the PS > > is ordered > > to the manufacturers spec but supplied by a vendor the > > makes power supplies. > > > > The Basecom20 is sold by Motorola but it is identical to > > the Astron > > R20. My guess Motorola contracts Astron to manufacture > > the power > > supply re-labled for Motorola to sell. > > > > When I was making custom equipment I didn't build the > > power supply as > > it was cheaper to buy something off-shelf at wholesale. > > > > > > 73, Ed - KL7UW, WD2XSH/45 > > ====================================== > > BP40IQ 500 KHz - 10-GHz www.kl7uw.com > > EME: 50-1.1kw?, 144-1.4kw, 432-100w, 1296-60w, 3400-? > > DUBUS Magazine USA Rep [email protected] > > ====================================== > > > > >______________________________________________________________ > > Elecraft mailing list > > Home: http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/mmfaq.htm > > Post: mailto:[email protected] > > > > This list hosted by: http://www.qsl.net > > Please help support this email list: > > http://www.qsl.net/donate.html > >--------------------------------------------------------------------- >Web mail provided by NuNet, Inc. The Premier National provider. >http://www.nni.com/ 73, Ed - KL7UW, WD2XSH/45 ====================================== BP40IQ 500 KHz - 10-GHz www.kl7uw.com EME: 50-1.1kw?, 144-1.4kw, 432-100w, 1296-60w, 3400-? DUBUS Magazine USA Rep [email protected] ====================================== ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
