isn't it about as likely the voltage will exceed the breakdown limits of the caps in the low pass filters ??? just a thought; maybe i'm way off base 73, w5xz
--- On Sun, 9/13/09, Ray J <r...@w9ray.org> wrote: From: Ray J <r...@w9ray.org> Subject: Re: [Flexradio] flex 5000a atu, swr, and astounding arrl article To: FlexRadio@flex-radio.biz Date: Sunday, September 13, 2009, 5:14 PM Last I thought.. impedance mismatch is one if the causes of "SWR".. so, it is one in the same basically.. the transmitter expects a 50 ohm load. if the load is not 50 ohms, the rf is reflected back into the transmitter.. excessive amounts of reflected power lead to breakdown of the transistor junctions.. the max swr limit is what is protecting the tuner and amplifier in the radio from destruction.. the radio should have a protection circuit built in... power output should fold back as the reflected power level increases.. protecting the pa from a "damaging" amount of reflected energy.. but continuously running the radio in this manor will probably wreck it.. w9Ray Jim Madden wrote: > He states that impedance mismatch, not SWR, is the cause of transmitter > failure. Given this statement, what protection exists in the flex 5000 to > protect the transmitter from failure? Is it irrelevant what swr I operate at > and thus I can go ahead and bump up the max SWR limit for tuning so I can > transmit on 80m? Is there failsafe protection built-in to the flex so that I > can't do something stupid and destroy the transmitter? > > > Jim > > WD7W > > _______________________________________________ > 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.flex-radio.com/ Homepage: > http://www.flex-radio.com/ > Message delivered to r...@w9ray.org > ------------------------------------------------------------------------ > > > No virus found in this incoming message. > Checked by AVG - www.avg.com Version: 8.5.412 / Virus Database: > 270.13.93/2365 - Release Date: 09/12/09 06:37:00 > > _______________________________________________ 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.flex-radio.com/ Homepage: http://www.flex-radio.com/ Message delivered to w...@att.net _______________________________________________ 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.flex-radio.com/ Homepage: http://www.flex-radio.com/ Message delivered to arch...@mail-archive.com
