Difference between revisions of "SSB6 Design"
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| − | Number Freq | + | Number Freq Delta from average |
| − | 09 8.997791 -7.7 | + | 09 8.997791 -7.7 |
| − | 12 8.997791 -7.7 | + | 12 8.997791 -7.7 |
| − | 41 8.997793 -5.7 | + | 41 8.997793 -5.7 |
| − | 06 8.997794 -4.7 | + | 06 8.997794 -4.7 |
| − | 21 8.997798 -0.7 | + | 21 8.997798 -0.7 |
| − | 38 8.997798 -0.7 | + | 38 8.997798 -0.7 |
</pre> | </pre> | ||
Revision as of 21:18, 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
- Response curve
Build
- SSB6 filter is too big for Kits and Parts board (5 crystals limit)
- 2500 Hz bandwidth
Schematic
3D Image
Measured Crystal Values
Number Freq Delta from average 09 8.997791 -7.7 12 8.997791 -7.7 41 8.997793 -5.7 06 8.997794 -4.7 21 8.997798 -0.7 38 8.997798 -0.7
Enclosure 80x50x20
- Fits in 80x50 extruded enclosure
- Material: Aluminum
- Color: black
- Size: approx.80*50*20mm
- Thickness: approx.1mm
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 (QRP Labs)
