Re: Stone Soup
On Wed, 05 Sep 2018 09:55:42 -0700
"Jerry Gaffke via Groups.Io" <firstname.lastname@example.org> wrote:
Nothing logical about building a new one-off homebrew HF transceiver.:-)
Yes, but if we didn't amplify unwanted signals, the XTAL filter has easier task. :-)1. Tuned IFsBoth IF's are tuned by crystal filters already.
Okay, but the harmonics can cause unwanted products.2. Filter the output of the LOsDiode ring mixers are commutating switches, not exactly the same as the
3. Push-pull preamplifier ( https://www.sv1afn.com/j310preamp.html )I guess the BFS17P is also cheep... but whatever.
5. PA redesign (normal push pull design, two stage of IRF530 ) useOk.
7. Maybe change of the mixers to JFET mixersTo be honest, nothing! I just want to build a JFET based mixer. You can
balance JFET based mixer easily. Or we shall use DBMs.
Raj's result suggests the spurs are not caused by the mixers, but ratherOkay. So that is why we shall filter the signals of the LOs.
73s de HA5OGL
Senior Electronic Engineer