On 6/12/2018 4:50 PM, Robert G Strickland wrote:
A small nit... perhaps my ignorance... but, I think that the roofing filter [by whatever name] comes after the first mixer, at the so-called IF frequency.
A month or so ago, as part of a project to measure input Z of receivers and preamps, I measured the 2nd RX of my K3 as 50 ohms and with a bandpass filter between the antenna input and the 50 ohm load. Clearly, in the K3, there is a "per band" bandpass filter ahead of the first RF stage.
73, Jim K9YC ______________________________________________________________ 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
