Bandpass filters for the input part of the RX / TCVR easily and quickly - G3RJV
Double tuned bandpass filter with input impedance 50 ohms for your QRP transceiver or receiver designed and calculated by G3RJV using ready-made coils from TOKO production. If you need to quickly and easily make a bandpass filter for your proposed device, then an easy solution is offered. In the following table you will find a series of bandpass filters from the G3RJV workshop, suitable especially for the input part RX etc.. The involvement was published in The Filter Handbook. The connection is designed for input / output impedance 50 ohms and can be cascaded to increase the overall suppression in the impermeable band (stop-band). With the help of TOKO coil cores, it is then possible to easily fine-tune the entire filter according to our ideas. The capacitors used are only high-quality mica-type designs, NPO apod. The FILTER HANDBOOK Stefen Niewiadomski Heineman Newnes 1989 ISBN 0-434-91378-2.
The values are listed for each band on individual lines:
| zone [MHz] |
typ TOKO T1 = T2 |
L [uH] |
C1-C3 [pF] |
C2 [pF] |
1.8 – 2.0 | 3333 | 45 | 150 | 12 | 3.5 – 3.8 | 3333 | 45 | 39 | 3.3 | 7.0 – 7.1 | 3334 | 5.5 | 100 | 8.2 | 10.1 – 10.15 | 3334 | 5.5 | 47 | 6.8 | 14.0 – 14.35 | 3334 | 5.5 | 22 | 3.3 | 18.07 – 18.17 | 3335 | 1.2 | 68 | 6.8 | 21.0 – 21.17 | 3335 | 1.2 | 47 | 4.7 | 24.89 – 24.99 | 3335 | 1.2 | 33 | 3.3 | 28.0 – 29.7 | 3335 | 1.2 | 22 | 3.3 | T1 & T2 types : KANK3333R, KANK3334R, KANK3335R | |||||||||
