Hello and thank you for responding so quickly.
I was using this example :
Error Page 404) and Chris Bowick book for design. I am new to filter design, however for coupling capacitors I calculated them so the input and output is matched to 50 ohms. The filter impedance is 980 ohms. I used the following formulas:
Filter impedance ( Z ) = Qn X QBw X 2 X pi X Fo X L
Xc = SQRT [ Zfilt X Zin - ( Zin X Zin ) ]
The bandwidth is 2MHz, so the designed Q factor is 19.1. The coils i am using were purchased from Bec, here is datasheet:
**broken link removed**).
So as I understand - I measure one resonant tank at a time with 2 coupling capacitors or 100K resistors (check that I have 38.2 MHz, measure the 3 db BW on oscilloscope or spectrum analyzer, calculate Rp. Once I calculated Rp, I need to add an equivalent loading capacitor to each tank? So 3 extra capacitors just add it in parallel with 3 designed capacitors in each tank or obviously just substitute the 3 capacitor to new value?
Thank you again for information, it was very helpful. Yes, I haven't found any information on Deshal's filter tuning.