Difference between revisions of "SSB6 Design"
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== Design == | == Design == | ||
| + | * 6 element filter | ||
* [http://w7zoi.net/filters/9megxfils.pdf W7ZOI Crystal Filter paper] has several crystal filter designs | * [http://w7zoi.net/filters/9megxfils.pdf W7ZOI Crystal Filter paper] has several crystal filter designs | ||
* Narrow bandwidth bandpass filters for SSB | * Narrow bandwidth bandpass filters for SSB | ||
Revision as of 12:22, 15 October 2021
Contents
Design
- 6 element filter
- W7ZOI Crystal Filter paper has several crystal filter designs
- Narrow bandwidth bandpass filters for SSB
- Used for transmit/receive
- 9 MHz nominal frequency
- 50 Ohms in/out impedance
- Bin crystals using Colpitts Crystal Oscillator
- Hand select close values from a pile of crystals
- Can get much closer than 10% of bandwidth with 50 crystals
- W7ZOI Filters on Kits and Parts Boards
- Other filter builds
- 5 or less crystals
W7ZOI SSB6 Schematic
My Build
- SSB6 filter is too big for Kits and Parts board
- 2500 Hz bandwidth
- Fits in 80x50 extruded enclosure?
- Too tall???
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
