Curt,
I did this as an update to the user guide July 2017.? Pretty close
to the version with the VNA test fixture. The Elsie model is also dated
7/2017.
The 250 pF capacitors don't seem to be a standard value?? For the
VNA evaluation the caps were 330 and 180 pF
I've browsed through all my Sprite 20m filter designs and only find the
one here.
But, I finally found this revised Elsie model in an old list... seems to
be the one with the values you described.
And, it looks good: about 2 MHz across the flat part of the curve and
impedance right at 50 Ohms and high RL. No idea when or why it was
done?
At 06:58 AM 6/13/2020, you wrote:
Chuck,
Didn't your recent work with the NanoVNA show best performance
using? parallel inductances of 160 nH, parallel cap of 800 pF,
series inductance 3.9 uH, series cap of 33 pF?
72, Curt KB5JO
Chuck, W5USJ (ex K2OFN)
ARCI 5422, SKCC 19956
EM22cv, Rains Co., Texas
--
Chuck, W5USJ
