1. Screening: The crystal used is not suitable for the filter (resonance frequency, body quality detection, 25% can be used).
2. Pairing: Crystals must be paired to achieve the best results (only 30% of the batch can be paired successfully).
3. Design: Crystal filter circuit design (the input impedance of the crystal changes greatly, matching circuit design)
4. Commissioning: Each crystal has different characteristics. It must be accurately debugged according to the impedance characteristics.
5. Instrument: The crystal filter bandwidth is extremely narrow, and special instruments are needed. Generally, the oscilloscope and spectrum analyzer cannot be used.
1. Technical parameters:
1. Working frequency: 45MHz ±7KHz
2. Dimnsions: 24 × 47mm (without connectors)
3. Out-of-band rejection: >80dB (BW<200kHz)
>60dB (BW<11KHz)
4. Connector form: SMA-KE (shape hole can be customized
5. In-band fluctuation: <1.0dB
6. System impedance: 50 ohms
7. Insertion loss: 2.0dB (typical)