If this will be a volume production, I suggest you to ask to manufacturer about the specifications of the crystal because even it works for a single sample of crystal, it may reject another sample.In order to insure that all device would work, the manufacturing standard should be satisfied.( I lived a bad experience so long time ago, 50% of the system returned back to us due to crystal compatibility problem)I haven't found much about specific crystal specs for the SA602 but someone may know from experience. This crystal is fundamental/32pF/30Ohm, that's all I know. It's a generic type crystal from a distributor, 10.7 is not the most common frequency therefore I don't have another type to try.
OK,BigBoss, thanks for this input, I'm sure you're absolutely right. However I don't plan on a volume production, therefore I just had to get what my distributor had and can't buy from a manufacturer directly.
What makes me suspicious is that I haven't read anywhere that any of the 602/612/605/615 etc series chips were particularly choosy about crystals...
I said it above.IC Oscillators need-in general- particular Xtal specifications and these specifications are known/provided by either manufacturer or you can find them by cut-and-try method.Finally it seems that these crystals are just crap for some reason. The new chip on a new pcb didn't change anything until I tried a 10.245 RX crystal and this one gave a result very much like E-design's. Unfortunately these are old stock crystals and I don't know their exact specs but they're nothing fancy I think. Now I need to find other 10.7 MHz crystals and the problem is I don't know what I'm looking for exactly...
Third-order intercept is typically -13 dBm (that is approximately +5 dBm output intercept because of the RF gain).The system designer must be cognizant of this large signal limitation. When designing LANs or other closed systems where transmission levels are high, and small-signal or signal-to-noise issues are not critical, the input to the SA602A should be appropriately scaled.
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