Hi Walter, Elecraft receivers, I'm familar with (K2,K3,KX[23], use "Feedback Amplifiers" for their Pre Amp. The Feedback Amplifiers are designed for nominal 50 ohm input impedance. Fifty ohm input impedance is somewhat import for operation of the receiver bandpass filter.
I'll assume detector input impedance, preAmp bypass, is also nominal 50 ohm impedance. John KN5L On 5/25/22 11:05 AM, Walter Underwood wrote: > What is a typical input impedance for modern receivers, or specifically > Elecraft receivers? > > I’m asking because antenna tuners are a frequent question on an SWL group I > follow and I’m pretty sure that they are not needed for most situations. If > the receiver input impedance is not 50 Ω, that is a big data point. > > My belief is that receivers are generally medium or high impedance, depending > on whether the first RF preamp is bipolar or FET, but either way, mostly > voltage-oriented. > > And, yes, I know that antenna tuners can be a LPF or HPF, depending on their > configuration. ______________________________________________________________ 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
