So are you saying that the KPA500 is a bad design? I'm not aware of a single non-CB amplifier that doesn't use an input pad...
Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ Owner - Operator Big Signal Ranch - K9ZC Staunton, Illinois Owner - Operator Villa Grand Piton - J68HZ Soufriere, St. Lucia W.I. Rent it: www.VillaGrandPiton.com Like us on Facebook! email: b...@wjschmidt.com -----Original Message----- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of David Woolley Sent: Friday, May 12, 2017 8:17 AM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] [KPA1500] Input Power Using a pad would be bad design, as simply increasing the level of negative feedback would help reduce distortion. The only way one could achieve a repeatable gain close to 15dB would be with negative feedback. Moreover, I assume it is an FCC condition that modification by the end not be easy. You can assume that CB users wanting to use illegal powers have access to soldering irons. Also, I would assume that the design gain is actually less than 15dB, to allow for component tolerances. -- David Woolley K2 06123 On 12/05/17 02:43, Dr. William J. Schmidt wrote: > All of those popular devices have gain more than 15 dB... so there is a pad in the amp to keep the gain at 15 dB. One would think that a "tweak" will evolve to modify the pad (and possibly the firmware) to eliminate this bothersome limit. ______________________________________________________________ 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 b...@wjschmidt.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
