I think K4D is a direct sampling SDR, no such thing as a discrete filter in sight, Crystal or otherwise.
K4HD module will revert a K4D back to an old fashioned superheat front end with a fixed first IF so you can fit filters but I don’t know if any outside Elecraft knows what the centre frequency will be. Probably only worth it if you’re a multi multi station or have 1500 watt neighbours half a mile away. Martin Hs0zed Sent from my iPhone > On 1 Dec 2023, at 18:47, Pete Smith N4ZR <pete.n...@gmail.com> wrote: > > I am about to buy a K4D. I have 500-Hz filters (probably INRAD) in both my > K-3's receivers. Will these filters fit in the K4D? If not, who currently > sells such filters for the K4D? > > -- > 73, Pete N4ZR > ______________________________________________________________ > 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 hs0...@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 arch...@mail-archive.com
