What are the current part vs. the original part number in the 1500? N2TK, Tony
Sent from my iPhone > On Nov 1, 2022, at 6:23 PM, M Cresap via Elecraft <elecraft@mailman.qth.net> > wrote: > > Hi Hal > I see the Rds difference. Wouldn't the higher Rds be compensated by the > better Rth (thermal resistance from junction to case) spec in the ART devices? > 73, Mike, W3IP > > On Tuesday, November 1, 2022 at 03:15:09 PM EDT, Dynolab > <dyno...@comcast.net> wrote: > > While the higher voltage ratings of the ART1K6 or ART2K0 series looks very > attractive, it is extremely important to remember that heat is the number > one killer of LDMOS RF power FETs! > That being said, take a look at the specifications of the ART1K6 and ART2K0 > and note that the Rds(on) drain-source on-state resistance of these devices > is significantly higher than that of the devices presently being used in the > KPA1500. > And this higher Rds(on) would result in higher drain-source saturation > voltage when the amplifier is running near its limits which would in turn > result in higher heat dissipation. > It is therefore possible that the ART1K6 or ART2K0 devices may be less > reliable than the devices currently being used in the KPA1500. > > 73, > Hal > W7YNC > > -----Original Message----- > From: elecraft-boun...@mailman.qth.net > [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of M Cresap via Elecraft > Sent: Tuesday, November 01, 2022 10:21 AM > To: Elecraft@mailman.qth.net > Subject: [Elecraft] KPA1500 replacement devices > > Anyone have an educated guess whether the ART1K6xx or ART2K0xx devices would > be a drop in replacement for the currently used device in the KPA1500? Most > of the interesting specs are within 10% of the current device, the open loop > gain may be a dB or two higher (if the data sheets are really comparing > apples to apples). > > The main attraction of the ART1K6 and ART2K0 devices is the higher peak > voltage handling capability - 177 or 200 volts vice 135 volts for the > current device. Maybe a higher peak voltage capability will keep the > amplifier out of the repair shop due to external events like arcing baluns > or antennas flexing in the wind. > > The package styles are identical, the ART devices are in stock from a few of > your favorite distributors, similar price to the current device, maybe the > quiescent bias voltage would have to be tweaked a bit... > > 73, Mike, W3IP > > - > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html Message > delivered to dyno...@comcast.net > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to tony....@verizon.net ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
