Function: 1 Application: The filter attenuator can be combined with the NanoVNAF measuring 6.5m/21.3ft ceramic notch filter. PCB Filter Sensor for VNA 2. SUPERIOR PERFORMANCE: RF demo kits can be combined with NanoVNA F measurement homemade low pass filters, and the 3dB bandwidth is approximately 400MHz. 3 Practical equipment: RF demo kit RF test board demo calibration board for learning vector analyzer test calibration 4 High Precision: Metal shielding is designed to reduce external interference and improve measurement accuracy. 5 SAFE AND RELIABLE: Each module is carefully selected for high quality and reliability. The board is small and lightweight, making it suitable for carrying. Specifications: a> Item Type: Filter Attnator Material: PCB Description: PCB Dimension 10x10cm / 3.9x3.9in for Learning Vector Analyzer Included: 1 RLC Series Parallel Circuit 1 2 RLC Series Parallel Circuit 2 3 33 Ohm resistance, SWR Constant Wave=1.5 4 75 Ohm resistance, SWR Constant Wave = 1.5 5 BSF Ceramic Filter Element, 6.5mhz Center Frequency BPF Ceramic Fi