![Ultra narrowband adjustable shape and bandwidth crystal phasing filter by SV3ORA The simplest crystal filter employs the use of a single crystal. It uses the very high Q of the crystal and its response is asymmetrical. This filter is too narrow for most ... Ultra narrowband adjustable shape and bandwidth crystal phasing filter by SV3ORA The simplest crystal filter employs the use of a single crystal. It uses the very high Q of the crystal and its response is asymmetrical. This filter is too narrow for most ...](http://www.qrp.gr/narrowxtalfilters/schem1.png)
Ultra narrowband adjustable shape and bandwidth crystal phasing filter by SV3ORA The simplest crystal filter employs the use of a single crystal. It uses the very high Q of the crystal and its response is asymmetrical. This filter is too narrow for most ...
![diy - Looking for origins of a crystal filter schematic used in uBITX - Amateur Radio Stack Exchange diy - Looking for origins of a crystal filter schematic used in uBITX - Amateur Radio Stack Exchange](https://i.stack.imgur.com/7eiOF.png)