Hello Andy

> Hi - I have been putting some of our ideas into practice, and have
> made my first attempt at a H-mode mixer rx. The circuit is at -
>
> http://g4oep.atspace.com/qrss%20rx/qrss_ssb_receiver_with_h_mode_mi.htm

Nice work, and very interesting how you have arranged the transformers
in the H-mode mixer.

Interesting and worrying! I don't completely understand that
transformer... it worries me because you are using the same core for
your input transformer and your output transformer, is that Ok? Also
is it Ok to be using that transformer at AF? I know that previously
you were considering just summing the two complementary baseband
outputs of the H-mode mixer using a differential amplifier. I wonder
why you changed now to using the transformer? What would be the
relative advantages and disadvantages of each?

> The adaptation of the h-mode mixer for audio outoput is novel, as is
> the rf input configuration. I have reduced the number of transformers
> required to just one. I am not aware that any concessions have been
> made which might compromise the intercept performance of the system.

It would be very interesting to measure. Do you have the right skills
and equipment to measure IP3? I know I don't. That's another one for
the G0UPL ToDo list :-(

73 Hans G0UPL
http://www.hanssummers.com