Bandpass Filter


Posted on Jan 30, 2013

This circuit is taken from the Progressive Communications Receiver in most of the recent ARRL Handbooks. Values for the 40 meter band are shown. If you want the ultimate in a bandpass filter for 40 or 20 meters, check out the bandpass filters in `An Integrated Contest-Grade CW Station`, Solid State Design for the Radio Amateur, by Wes Hayward and Doug DeMaw, Page 225.


Bandpass Filter
Click here to download the full size of the above Circuit.

Another set of bandpass filters can be obtained from a "Solid State Communications Receiver", Ham Radio, October 1975, Page 34. For information on evaluating and adjusting double-tuned circuits for maximum performance, check out the article "The Double-Tuned Circuit: An Experimenter's Tutorial", by Wes Hayward, December 1991, QST, Page 29. To find information on bandpass filters on the internet check out Bandpass and I.F. Filter Information at the QRP HomeBuilder web site. He has very nice 20 meter and 30 meter bandpass filters using either capacitors or transformers for matching to a 50 ohm input and output. Very good advice is given on building the filters.





Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Backup Beeper
Cable Tester Circuit
Pulse-Width-Modulated Motor-Speed Control Circuit
Light-sensitive Alarm Project
Commodore 64 Cassette Interface
Inductive switching power supply circuit diagram
Pressure sensor circuit with a filtering and amplification circuit diagrams



Top