EMRFD Message Archive 7373

Message Date From Subject
7373 2012-03-29 01:54:46 ha5rxz Filter Crystals - A Quick Question

If I want to build a filter at a custom frequency of 40.0848 MHz do I order series resonant or (say) 10pf parallel at this frequency?

Peter HA5RXZ

7374 2012-03-29 03:55:14 Leon Heller Re: Filter Crystals - A Quick Question

7376 2012-03-30 03:53:17 Tim Re: Filter Crystals - A Quick Question

Since you specify a center frequency precise to 100Hz I'm going to assume that's an important value to you. 100 Hz out of 40MHz is about 2.5 parts per million. That's pretty dang tight.

Best in one iterati

7373	2012-03-29 01:54:46	ha5rxz	Filter Crystals - A Quick Question
Message	Date	From	Subject
If I want to build a filter at a custom frequency of 40.0848 MHz do I order series resonant or (say) 10pf parallel at this frequency? Peter HA5RXZ
7374	2012-03-29 03:55:14	Leon Heller	Re: Filter Crystals - A Quick Question

7376	2012-03-30 03:53:17	Tim	Re: Filter Crystals - A Quick Question
Since you specify a center frequency precise to 100Hz I'm going to assume that's an important value to you. 100 Hz out of 40MHz is about 2.5 parts per million. That's pretty dang tight. Best in one iterati