Difference between revisions of "RF Band Pass Filters"
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[[file:QRPLabs_BP_Filter_PartsList.PNG]] | [[file:QRPLabs_BP_Filter_PartsList.PNG]] | ||
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| + | == Performance == | ||
| + | |||
| + | * 20 MHz | ||
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| + | [[file:6_20m.jpg]] | ||
| + | |||
| + | * 40 MHz | ||
| + | |||
| + | [[file:4_40m.jpg]] | ||
Revision as of 12:20, 28 September 2021
A band pass filter (LPF) is used at the front end of a receiver, to attenuate strong out-of-band signals. Strong signals that reach the receiver’s first mixer and/or RF pre-amplifier cross-modulate and produce unwanted spurious responses at the receiver output
Contents
Design Details
- Double-tuned circuit filter
- Based on The double-tuned Circuit: An experimenter's tutorial
- QRP Labs design - Commercially available at reasonable cost
Schematic
Parts
Performance
- 20 MHz
- 40 MHz
