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9 MHz 6 Pole 250 Hz Crystal Filter Model 221
Special 250 Hz filter with the passband centered on 500 Hz rather than 750 Hz. Same as 219 except for the passband.
Specifications
| Center Frequency | 9.000500 |
| 6 dB BW, Hz | 250 |
| Shape Factor, 6/60 dB | 3.5:1 |
| Insertion Loss, dB | 14.0 |
| Ultimate Rejection, dB | 85+ |
| Z in & out, Ohms | 200 |
| Number of Poles | 6 |
