That was my plan for the next logical step, Tony. Hope to have some
interesting data tomorrow on that. I'll wind a new (standard ratio)
T1 and put it on a piece of perfboard to attach to my SR80 test
unit. Then I'll sweep the transformer attached to the QSD. (with the
LO set for 40M) I have my suspicion that perhaps the match to the
QSD impedance can be inproved with a slightly different turn ratio.
We'll see.
Stayed tuned for further developments.....
-Bruce N1RX
--- In softrock40@..., "Tony Parks" <raparks@c...> wrote:
Hi Bruce,
It would be very interesting to see what the Z input is at the
primary of T1
when the oscillator is stopped. Can you make this measurement
with the BPF
disconnected from T1? With the oscillator stopped there will
still be one
of the QSD switches made and thus one of the secondary windings
will be
loaded by 10 ohms in series with the switch resistance. This
series
combination should reflect to the primary by the square of the
turns ratio,
i.e, (13/6)squared. With the oscillator running there is still
one switch
and one 10 ohm resistor as a load on one of the secondary windings
at a
given time.
Thanks for all the work you are doing Bruce!
73,
Tony KB9YIG
