品牌: Bright Aviation, China.
型号: SCF118-142M-CH1，SCF118-142M-CH2，ADF112-156M-CH2.
描述: “Bright Aviation” develops, produces and sells various types of VHF cavity filters.
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VHF Single and Dual Cavity Filter
一、Business
“Bright Aviation”supplies complete sets of products, including after-sales service, technical consultation, spare parts support and other businesses.
二、Overview
1. VHF single and dual cavity filter is used together with VHF radio.
2. Single cavity filter has small channel insertion loss and high out of band rejection. It is used to improve the isolation between VHF radio transmitters and the selectivity of receivers, and can effectively suppress out of band noise and inter modulation interference.
3. The dual cavity filter has larger path insertion loss and higher out of band rejection. It is used to improve the selectivity of VHF radio receiver and the isolation between multiple transmitting stations, and can more effectively suppress out of band noise and inter modulation interference.
4. The single cavity filter is a selective band pass filter. For the operating frequency F0 set by the cavity filter, the smaller the insertion loss, the better, better than ≤-2dB.
5. The dual cavity filter is composed of two single cavity filters in series to form a band-pass filter with better selectivity. For the working frequency F0 set by the cavity filter, the insertion loss is ≤-2.5dB to obtain coupling pass. For RF signal with operating frequency F0 ±500KHz, the insertion loss is ≤-30dB.
三、Appearance and Characteristic
SCF118-142M-CH1 single Cavity Filter | |
| 1. Frequency Range: 118～142 MHz. 2. Input Power: ≤200W. 3. Insertion Loss: ≤-2dB（adjustable）. 4. Factory Commissioning Frequency: 127.5MHz. 5. Reverse Loss: ≤ -14dB, typical value ≤ -20dB. 6. Frequency Selectivity: ≤ -15dB (carrier frequency±500KHz). 7. Tuning Mode:manual rotary tuning, telescopic movement. 8. Impedance: 50 ohms. 9. Connector: N-type female. 10.Size: 21 (L) * 21 (W) * 67 (D) cm. 11. Weight: 7kg. |
SCF118-142M-CH2 Dual Cavity Filter | |
| 1. Frequency Range: 118～142 MHz. 2. Input Power: ≤ 200W. 3. Insertion Loss: ≤ -2.5dB（adjustable）. 4. Factory Commissioning Frequency: 127.5MHz. 5. Reverse Loss: ≤ -20dB, typical value ≤ -25dB. 6. Frequency Selectivity: ≤ -30dB (carrier frequency±500KHz). 7.Tuning Mode:manual rotary tuning, telescopic movement. 8. Impedance: 50 ohms. 9. Connector: N-type female. 10.Size: 42 (L) * 21 (W) * 67 (D) cm. 11. Weight: 14kg. |
ADF112-156M-CH2 Auto Tuning Dual Cavity Filter | |
| 1. Frequency Adjustable Range: 112～156MHz. 2. Input Power: ≤ 200W. 3. Insertion Loss: ≤ -2dB (adjustable). 4. Factory Commissioning Frequency: 127.5MHz. 5. Reverse Loss: ≤ -20dB, typical value ≤ -15dB. 6. Frequency Selectivity: ≤-30dB (carrier frequency ± 500KHz). 7. Tuning Mode: 8.33KHz, 25KHz, custom channel interval 2.5KHz. 8. Tuning Time: full frequency band (112～156MHz) Tuning time: ≤ 13s, typical value ≤ 7s. Narrow band (118～137MHz) tuning time: ≤ 7s, typical value ≤ 5s. 9. Tuning and Control Interface: IP. 10. Input and Output Impedance: 50 ohms. 11. Connector: N-type female. 12. AC Input: 110V～220Vac±10%, 47～63Hz, single-phase. 13. DC Input: 20～32Vdc. After the AC power supply is interrupted, the DC power supply is automatically activated to maintain normal operation. 14. Dimensions: 42 (L) * 42 (W) * 75 (D) cm. 15. Weight: 22.5 kg. 16. Temperature: indoor -10 ° C~+55 ° C. 17. Relative humidity: 0~95% indoor (non condensing). |
四、Measurement Analysis
SCF118-142M-CH1 Single Cavity Filter，Use the network analyzer (N9913A) to measures the low, medium and high operating frequencies, insertion loss , as shown below.
Operating Freq：118MHz Insertion Loss：-1.42dB | Operating Freq：127MHz Insertion Loss：-1.36dB | Operating Freq：137MHz Insertion Loss：-1.39dB |
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