All Has anyone considered a boost regulator? There are several companies making them. I even saw an ad in QST for one made by MFJ. It will maintain 13+ volts even with the input down to 10. to 11v Jim K5HY
> From: ctsee...@cox.net > To: flexradio@flex-radio.biz > Date: Thu, 21 May 2009 05:59:27 -0400 > Subject: [Flexradio] Flex-3000 voltage requirements > > That's interesting. Do you know if the 5000A has the same > characteristics? I was thinking of running mobile in my 24' I/O boat > this summer for a couple of nights. I'd like to be able to use the 5000 > without having to run the engine all the time. > > As long as I'm asking the questions, I was going to pick up one of those > Hi-Q antennas for the boat. Does anyone have any good suggestions for a > ground plane on a small (24') fiberglass boat? > > Thanks. > Chris > KA1GEU > > > > -----Original Message----- > From: "Ken Simmons" <k...@flex-radio.com> > Subject: [Flexradio] Flex-3000 voltage requirements > To: "FlexRadio reflector" <flexradio@flex-radio.biz> > Message-ID: <018901c9d89c$88e55b00$7614a...@ken> > Content-Type: text/plain; format=flowed; charset="iso-8859-1"; > reply-type=response > > All Flex-3000 users: > The dropout voltage of the 5V regulator is 2.5V, all the lower voltage > regulators are LDO types. > I have completed a few simple low voltage tests, the production > calibration > tests all pass at ~11.4V. > The preamp is the only non-regulated voltage active component in the > receive > path and has .3 dB less gain at this reduced voltage. > Tested the transmitter on 20mtr USB with a recorded wavefile: Info panel > > reads ~10.7 V, Powermaster wattmeter: 83W (Tune @100 drive level) and > listened on a F5K audio sounded same as full voltage of 13.8V. > > The Flex-3000 was used mobile traveling from Austin, Tx to the Dayton, > Oh > Convention, and return trip operating as K5FRS, with no technical > problems, > although band conditions were not the best. > > Ken Simmons, K5UHF > FlexRadio Systems > Senior Design Engineer > 13091 Pond Springs Rd. #250 > Austin, TX 78729 > Phone: 512-692-9044 > > "Tune in excitement!" T > > > > _______________________________________________ > 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/ _______________________________________________ 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/
