Yes.
Good job!
That passband graph looks great!
To be clear, it looks like each of the individual SAW filters has?
the recommended impedance transformation network?
on each side of the SAW filter.
So a total of four 33uH inductors and four 6.8pF capacitors,
as recommended in the B3555 datasheet.
The datasheet for Eric's B3550 recommends the same 33uH inductors,
but changes the capacitors to be 5.6pF.
Some SAW filters require a much different impedance transformation network.
Having the two SAW filters and the inductors physically separated like that?
(or perhaps shielded from each other) will improve the stopband
by preventing unwanted signals from sneaking around your filter.
It would be ok for the two middle 33uH inductors to see each other,
in fact that could be one big coil.
But the inductors on the ends should not couple to any other inductors.
Jerry, KE7ER
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On Thu, Jan 2, 2020 at 02:47 PM, Joerg ex-DB2OO wrote:
Then I split the filters and added in between the 50 Ohm transformation network made up of the 33nH (4 turns, 3 mm diameter) and 6.8pF
