Differences
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221 [2007/02/13 22:16] n5na |
221 [2007/11/28 15:29] n5na |
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| ====== 9 MHz 6 Pole 250 Hz Crystal Filter Model 221 ====== | ====== 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. | + | Special 250 Hz filter with the passband centered on 500 Hz rather than 750 Hz. Same as 219 except for the passband frequency. |
| ===== Specifications ===== | ===== Specifications ===== | ||
| | Center Frequency | 9.000500 | | | Center Frequency | 9.000500 | | ||
| | 6 dB BW, Hz | 250 | | | 6 dB BW, Hz | 250 | | ||
| - | | Shape Factor, 6/60 dB | 3.5:1 | | + | | Shape Factor, 6/60 dB | 2.4:1 | |
| - | | Insertion Loss, dB | 14.0 | | + | | Insertion Loss, dB | 10.0 | |
| | Ultimate Rejection, dB | 85+ | | | Ultimate Rejection, dB | 85+ | | ||
| | Z in & out, Ohms | 200 | | | Z in & out, Ohms | 200 | | ||
| | Number of Poles | 6 | | | Number of Poles | 6 | | ||
| + | |||
| ===== Additional Information ===== | ===== Additional Information ===== | ||
| - | From Scott Robbins, W4PA, on the Ten-Tec Reflector: | + | **From Scott Robbins, W4PA, on the Ten-Tec Reflector February 17, 1998:** |
| As regular readers of the reflector, you've probably seen the thread | As regular readers of the reflector, you've probably seen the thread | ||
