Thank you Tim....... HANFORD R. WRIGHT WA4LZC CCA# AC11-12590
-----Original Message----- From: FlexRadio [mailto:flexradio-boun...@flex-radio.biz] On Behalf Of Tim Ellison, W4TME Sent: Friday, October 26, 2012 17:16 To: flexradio@flex-radio.biz Subject: Re: [Flexradio] Heads up on Astron Power supplies Here is a easy mod for the inrush current issue http://www.repeater-builder.com/astron/inrush/astron-surge.html Tim Ellison, W4TME Product Management, Sales & Support FlexRadio Systems 4616 W Howard Ln Ste 1-150 Austin, TX 78728 Phone: 512-535-4713 Ext. 223 Email: t...@flexradio.com <mailto:t...@flexradio.com> Web: www.flexradio.com <http://www.flexradio.com> logo On 10/26/2012 2:08 PM, Chuck ONeal wrote: > That's normal, mine does it also. > > It's caused by the inrush current charging the power supply capacitor > with the resulting current surge in the power transformer making it > "ring". The amount of the surge will depend where on the 60 Hz power > line waveform you happen to switch it on. At the peak of voltage it > will be the worst. That's why it seems to vary each time you turn it on. > > The supply could use a step start to eliminate it which basically is a > series resistor in the primary that is shorted out after a few > seconds, allowing the capacitor to charge slowly. > > Chuck, K1KW > > > ----- Original Message ----- From: "Hanford R Wright" > <jo...@earthlink.net> > To: "Dave Beumer WDHB" <d...@w0dhb.net> > Cc: <flexra...@yahoogroups.com>; <flexradio@flex-radio.biz> > Sent: Friday, October 26, 2012 1:54 PM > Subject: Re: [Flexradio] Heads up on Astron Power supplies > > >> I have an Astron RM-35 amp linear power supply powering my Flex-3000 >> and sometimes it will make a loud clank when I turn it on. Has >> anyone know what causes that kind of racket? >> >> 73's >> Hanford >> WA4LZC >> CCA # AC11-12590 >> Sent from my iPhoney please pardon my typos. >> >> On Oct 26, 2012, at 13:01, Dave Beumer WDHB <d...@w0dhb.net> wrote: >> >>> My apologies if this has been posted prior. >>> >>> I have had 2 Astron RS-35 power supplies fail in 4 years for the >>> same reason >>> and apparently others have also. >>> >>> If you observe any of the following symptoms with your Astron Linear >>> supply: >>> >>> - intermittent Crow Bar >>> - Sudden loss of output >>> - Strong burning smell >>> >>> On both of my power supplies the screw they used to fasten the >>> regulator >>> board to the top of the capacitor was too long and bottomed out >>> before the >>> connection was sufficiently tightened. That in turn caused a bad high >>> resistance connection that overheated and caused the intermittent >>> triggering >>> of the over voltage circuit. >>> >>> It finally got hot enough to burn the board and damage the capacitor. I >>> would highly suggest that you check your supply and if they find a >>> similar >>> situation that you add a star style lock washer between the board on >>> the >>> first ring terminal and another between the two ring terminals. That >>> should >>> take enough slop out of it not to bottom the screws and cause a flaky >>> connection. >>> >>> The problem didn't show up until about a year or so after I got the >>> supplies. One was brand new, the other was 10 years old when I got it. >>> >>> After the above fix, both supplies are working fine. >>> >>> I think the higher current draw of the V/U unit in my 5000A may have >>> made >>> the problem crop up sooner. >>> >>> >>> Dave >>> W0DHB >>> >>> >>> _______________________________________________ >>> FlexRadio Systems Mailing List >>> FlexRadio@flex-radio.biz >>> http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz >>> Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ >>> Knowledge Base: http://kc.flexradio.com/ Homepage: >>> http://www.flexradio.com/ >> >> _______________________________________________ >> FlexRadio Systems Mailing List >> FlexRadio@flex-radio.biz >> http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz >> Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ >> Knowledge Base: http://kc.flexradio.com/ Homepage: >> http://www.flexradio.com/ >> > > > _______________________________________________ > FlexRadio Systems Mailing List > FlexRadio@flex-radio.biz > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ > Knowledge Base: http://kc.flexradio.com/ Homepage: > http://www.flexradio.com/ _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/ ----- No virus found in this message. Checked by AVG - www.avg.com Version: 2012.0.2221 / Virus Database: 2441/5355 - Release Date: 10/26/12 ----- No virus found in this message. Checked by AVG - www.avg.com Version: 2012.0.2221 / Virus Database: 2441/5355 - Release Date: 10/26/12 _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/
