I don't understand the rationale for feeding a $2500-$7500 piece of equipment from a supply with a less-than-stellar history, when lab equipment is available at hobbyist prices:
B&K Precision 3-15VDC 40A switching supply for about $300: http://www.amazon.com/Precision-1692-Switching-Digital-3-15VDC/dp/B00068OUNY/ref=sr_1_38?s=industrial&ie=UTF8&qid=1402583789&sr=1-38 B&K Precision 1-16VDC 60A switching supply for about $570: http://www.amazon.com/dp/B005G5MALQ/ref=biss_dp_t_asn Thousands of these are in use in test labs throughout the US, including automotive EMC and radio test chambers. They emit minimal RFI, a very quiet, run cool and are very reliable. They also offer a useful amount of load protection, something lacking in most hobbyist supplies. Mike - N8MSA ----- Original Message ----- From: "Bret Mills" <bret.w...@gmail.com> To: "K9DUR' 'Ray" <k9...@rnacs.com>, "Dudley Hurry" <jhu...@austin.rr.com>, "Dave Movius" <dave.mov...@gmail.com> Cc: flexradio@flex-radio.biz Sent: Thursday, June 12, 2014 10:06:45 AM Subject: Re: [Flexradio] Power Supply Advice Same here, I have lost a BUNCH of 2N3055 pass transistors over the last 30 years and equipment that was attached to the Power supply, Also the big Electrolytic goes bad and you have a lot of AC ripple after about 5 years of operation. If your equipment is important to you rebuild the Astron P.S. every 5 years or so of continuous operation, you may be lucky enough to get 10 years out of it but your asking for trouble, this is why around here you never see Astron Power supplies at a commercial Mountain top site on commercial radio equipment. Most Commercial installation these days use there own design, I do know Kenwood systems use Duracom switcher Pwr. Supplies but these are a bit noisy on HF so don't play well in Amateur use. 73's Bret WX7Y -----Original Message----- From: FlexRadio [mailto:flexradio-boun...@flex-radio.biz] On Behalf Of Ray, K9DUR Sent: Thursday, June 12, 2014 5:26 AM To: 'Dudley Hurry'; 'Dave Movius' Cc: flexradio@flex-radio.biz Subject: Re: [Flexradio] Power Supply Advice Dudley, I agree. Our club had an Astron RM-35 that had the series pass transistor fail (short). The output voltage went to the maximum provided by the transformer & the 2 rigs connected to it were damaged. The Yaesu FT-950 was repairable, but a Yaesu FM rig was not economical to repair. A problem with linear supplies is that if the series transistor fails, the result is a serious over-voltage situation. 73, Ray, K9DUR http://k9dur.info -----Original Message----- From: FlexRadio [mailto:flexradio-boun...@flex-radio.biz] On Behalf Of Dudley Hurry Sent: Wednesday, June 11, 2014 9:48 PM To: Dave Movius Cc: <flexradio@flex-radio.biz> Subject: Re: [Flexradio] Power Supply Advice Keep am eye on the analog power supplies , over time they will begin to lose voltage regulation and will need to be repaired or replaced. 73, Dudley WA5QPZ _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz To opt out of the Reflector: http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz To opt out of the Reflector: http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz To opt out of the Reflector: http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz
