Before the KPA1500 was released, I ran two KPA500s in parallel. On the high bands, a K3 would not drive both amps to 500 watts. The NX1P mod enabled a full 1000 W out on all bands.
Ken K6MR From: Phil Hystad via Elecraft<mailto:elecraft@mailman.qth.net> Sent: Thursday, June 18, 2020 10:28 To: Gmail - George<mailto:gdanne...@gmail.com> Cc: Elecraft@mailman.qth.net<mailto:Elecraft@mailman.qth.net> Subject: Re: [Elecraft] Future of KPA500 & KAT500 Why would you modify your KPA500 and risk warranty, repair, and clean signals for a mere 1/2 S-Unit at best? > On Jun 18, 2020, at 9:27 AM, Gmail - George <gdanne...@gmail.com> wrote: > > Paula Keezer NX1P modified a KPA500 to allow it to be driven to about 500 > watts by a KX3. > She published it - but I can not find it on the web. > The mod increased the gain by less than 3 db (seems I recall 2.something). > You would need the 12 to 15 watts to drive it to about 500 watts. > > The modification involved removing the input pad and modifying the feed back > loop to the microprocessor. > I thought about doing the mod to be able to run a net with my KX3 if my K3 > quit. > I have a KXPA and decided not to do the modification. > I can just remove my KX3 & KXPA from my truck if I ever need a backup to > drive the KPA500. Probably 10 minutes work and find the bag of portable > cables. > > BTW - Ms. Keezer's modification was very detailed and she had many cautions > regarding doing the modification. > It defiantly was not a matter of "cutting a jumper" to remove the input pad. > You need remove the pad parts and change the number of turns in a > transformer. > > Defiantly would void the warranty and make factory repairs iffy depending on > Elecraft's policies. > Other manufacturers I have worked with would restore the amp to factory > while repairing it. > > As a ham you are not limited to the 15 db gain restriction - the > manufacturer is but not you. > > 73 > George AI4VZ > > -----Original Message----- > From: Charlie T > Sent: Thursday, June 18, 2020 9:06 AM > To: 'Nr4c' > Cc: Elecraft@mailman.qth.net > Subject: Re: [Elecraft] Future of KPA500 & KAT500 > > Isn't there some sort of "jumper" or ???, that will increase the gain to > something other than the ridiculous and prohibitive +13 dB figure, for > "international" (wink-wink) sales, sorta like the "MARS" mod in almost all > radios these days? > > 99.9% of the chicken band users today are happy with their 5 watt radios. > However, that restrictive and useless +13 gain law does NOTHING to stop the > REALLY big guns on 27.025 who typically run amps using tubes that have > HANDLES on them! > (I've personally seen channel 6 mobile set-ups running power in excess of 25 > kilowatts.) > > 73, Charlie k3ICH > > > > > -----Original Message----- > From: elecraft-boun...@mailman.qth.net <elecraft-boun...@mailman.qth.net> On > Behalf Of Nr4c > Sent: Wednesday, June 17, 2020 3:14 PM > To: Paul Gacek <w6...@yahoo.com> > Cc: Don Putnick <donnie...@gmail.com>; Elecraft Reflector > <Elecraft@mailman.qth.net> > Subject: Re: [Elecraft] Future of KPA500 & KAT500 > > The KAT500 has three antenna out ports. It only needs one In so the KPA500 > needs only one out port. > > As for the 10 W in and 500 out idea. That is prohibited by law. They’re > only allowed to sell an amp with max gain of 13dB. > > Sent from my iPhone > ...nr4c. bill > > > > ______________________________________________________________ > 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 gdanne...@gmail.com > > ______________________________________________________________ > 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 phys...@mac.com ______________________________________________________________ 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 k...@outlook.com ______________________________________________________________ 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
