Allison Parent <kb1gmx@...>
I've put inline comments.
--- In BITX20@..., "Roy E. Ruivivar" <Roy.Ruivivar@d...>
For a decent CW or SSB filter the crystals need to be within 100Hz
or less. Even 3 poles will be weak for a CW filter in active bands.
This way I can try the 10.7 Mhz Ceramic Filters/Resonators later on. ICeramic resonators are lower Q devices than crystals and do not make
good narrow band filters.
One caveat of the BITx is the filter is important. There are few
tuned circuits and filters with out of band responses are not
desireable. Filters I've built with ceramic resonators and filters
do tend to have excess bandwidth and out of band responses.
BTW, does the principle for Testing the 10 Mhz Crystals and computingIt's possible to use any crystal in the range of 6-20mhz is matched
with the correct termination and coupling capacitors. Old 27mhz
crystals (at fundemental 9mhz) are very good for this too.