Difference between revisions of "Crystal Filter Design"
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* [http://w7zoi.net/filters/9megxfils.pdf 9 MHz Filters With Inexpensive Crystals] - W7ZOI | * [http://w7zoi.net/filters/9megxfils.pdf 9 MHz Filters With Inexpensive Crystals] - W7ZOI | ||
− | === | + | === CW3 Crystal on Kits and Parts Board === |
+ | |||
+ | * Schematic from W7ZOI paper | ||
[[file:XTAL-CW3_Crystals.PNG]] | [[file:XTAL-CW3_Crystals.PNG]] | ||
+ | |||
+ | * Modified K&P schematic | ||
[[FILE:XF2_CW3_SCH.PNG]] | [[FILE:XF2_CW3_SCH.PNG]] | ||
+ | |||
+ | * K&P Board | ||
[[file:XF2.PCB.png]] | [[file:XF2.PCB.png]] | ||
+ | |||
+ | * NanoVNA capture | ||
[[file:PartsAndKits_9MHz_CW3_NanoVNA.PNG]] | [[file:PartsAndKits_9MHz_CW3_NanoVNA.PNG]] |
Revision as of 14:43, 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
- Modified K&P schematic
- K&P Board
- NanoVNA capture
CW 5 Crystal
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