Difference between revisions of "Crystal Filter Design"
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Revision as of 22:57, 28 August 2021
Design
- Butterworth, Chebyshev filters
- Narrow bandwidth filters for CW or SSB
- Several crystal filer designs
- Bin crystals using Colpitts Crystal Oscillator
- Hand select close values from a pile of crystals
W7ZOI Filters
CW3 Crystal on Kits and Parts Board
- Schematic from W7ZOI paper
- W7ZOI Measurements
- Modified K&P schematic
- K&P Board
- NanoVNA Capture / Analysis
- Bandwidth
- 400 Hz -3dB measured
- 600 Hz -6dB measured
CW 5 Crystal
- Schematic from W7ZOI paper
- W7ZOI Measurements
- XF2 Modifications
- K&P Board
- Cut etch from X2 to X3
- Cut etch from X4 to X6
- Add wire across C1
- Add wire across C8
- NanoVNA Capture / Analysis
CW3 VS CW5 Filter Comparison
SSB 4 Crystal
SSB 6 Crystal
References
- Crystal ladder filters – Software
- Crystal Ladder Filters for All - ARRL QEX
- DISHAL software by DJ6EV
- A Practical Test Set for Comprehensive Crystal Testing
- Crystal characterization and crystal filter design
- Crystal parameters Written by Hans Summers
Kits and Parts dot Com Crystal Filter Kit
Schematic
PCB
Notes
- T1 & T2 are optional matching transformers.
- Typical transformer type will be a BN-43-2402 using 34 gauge magnet wire
- C3a,C4a,C5a,C6a are optional trimmer capacitors for fine tuning the crystal filter
- Typical trimmer caps are GKG50015
Videos
IMSAI Guy Videos
Gregg Messenger VE6WGM
Charlie Morris
- Jan '21 - Simple SSB Rig: Part 3 - Crystal Filter
- Mar '20 - CW Rig. Part 1 - Homebrew CW Crystal Filter
- Aug '18 - Homebrew 80/40m SSB/CW Rig - #4b CW Crystal Filter
- Jan '18
W2AEW
W0QE
Amateur Radio VK3YE
bill ncham