As far as I know, they are NOT rated Intermittent COMMERICIAL Service. They're rated Intermittent COMMUNICATIONS Service, which is something they made up. It's way lower than you think.
On Tue, 19 Nov 2013, Ron D'Eau Claire wrote:
Astrons are rated ICS (Intermittent Commercial Service). Old timers in the Ham hobby will remember that as ICAS (Intermittent Commercial and Amateur Service). For example, the Astron spec sheet for the Astron 20 will show a continuous current rating of 16 amps and an ICAS rating of 20 amps. One can demand 20 amps peak for SSB or even CW operation and even normal high-duty-cycle operation with a few minutes at 20 amps and then a few minutes in standby. But, beyond that, it's likely to overheat and shut down to protect itself. 73, Ron AC7AC -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Hisashi T Fujinaka Sent: Tuesday, November 19, 2013 8:34 AM To: Robert Nobis Cc: [email protected] Subject: Re: [Elecraft] Reliable DC Power Supply for K3/P3 The only thing that bit me: Astron XX does not mean XX amps. I have an Astron 25M and I was trying to figure out why my K2/100 would power off on 15M at 100W when I finally figured out that that the Astron 25 is a 20 amp power supply and my K2 needed a bit more. It would even fold back the voltage. After more debugging (and lots of bypass caps & chokes and dummy loads and a brand new oscilloscope) and I found that RF in the shack could be part of the problem but just swapping to an Astron 35M was my fix. ______________________________________________________________ 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
-- Hisashi T Fujinaka - [email protected] BSEE(6/86) + BSChem(3/95) + BAEnglish(8/95) + MSCS(8/03) + $2.50 = latte ______________________________________________________________ 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
