I'm homebrewing a uBITX to go with the factory model, ultimately trying to add a few things Farhan has suggested. like the HYCAS IF strip.
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I am trying to breadboard the 45 MHz filter at the moment and have a couple of questions.
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The first is the value of C210 and C216 in the 45 MHz filter section. As I read the schematics on both V3 and V4 I only see a "0" for the capacitor value.? If anyone can tell me what that should be before I tear into my V3 and try to figure it out I'd be in your debt.
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Second, I bought a matched pair of the TMCF 45 MHz crystal filters from Ebay.? I breadboarded 1 by itself and it looked pretty good, but since I have the other is it worth trying to build from scratch with the 4 pole filter, and if so, has anyone seen an app sheet for that?? I can find the spec sheet but it doesn't show how the matched pair should be configured. I've seen a few other types of matched pairs that suggest for example that the filters should be in series, with the black dots connected, but nothing more than that.
