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Homebrew SSB Filter	Reply
by TANAKASAN on July 2, 2008	Mail this to a friend!
Which would be better for an SSB Ladder filter, 20pf load capacitance or 10pf? Tanakasan

RE: Homebrew SSB Filter	Reply
by WB6BYU on July 2, 2008	Mail this to a friend!
Whatever matches the terminating impedance of the filter and gives the desired passband with the specific set of crystals you are using. Ideally you should measure the crystals you are using in the filter and calculate the parameters from that, though you can also experiment to find what works best. But it is difficult to state a general rule without knowing details such as the crystal frequency, intended bandwidth, terminating impedance, etc.

RE: Homebrew SSB Filter	Reply
by TANAKASAN on July 4, 2008	Mail this to a friend!
OK, I will have another go. (Sometimes English is not precise enough). I have a choice of purchasing 100 4.9152 MHz crystals from a supplier with either a 20pf load capacitance or 10pf. I need to know which will be best and/or easier to work with. Frequency: 4.9152 MHz Intended bandwidth: anything between 2.7 KHz and 3 KHz (the title of the post was Homebrew SSB filter after all) Terminating Impedance: Don't care, I'll make the filters first then build matching networks. Tanakasan

RE: Homebrew SSB Filter	Reply
by KB1GMX on July 7, 2008	Mail this to a friend!
Usually when they specify load capacitance the crystals are ground for parallel resonant mode. You want series resonant crystals for ladder filters or you going to have a bit of work to characterize the crystals. Hope that helps. Allison

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