20 MHz 5-Pole Bessel Low Pass Filter 50 Ohm BNC In/Out Hand-Built PCB Card

20 MHz 5-Pole Bessel Low Pass Filter 50 Ohm BNC In/Out Hand-Built PCB Card

This is a hand-built 5-pole Bessel low pass filter with a 20 MHz cutoff frequency, constructed on a copper-clad PCB card. The filter uses 50-ohm input and output impedance and is terminated with BNC connectors on each end. Handwritten labels on the component side identify the input, output, cutoff frequency, and filter type. This appears to be a custom or prototype-grade filter card built for lab or bench use.

Specifications & What's Included

• Filter topology: Bessel (maximally flat group delay / linear phase)
• Number of poles: 5
• Cutoff frequency: 20 MHz
• Input impedance: 50 Ohms
• Output impedance: 50 Ohms
• Connector type: BNC (female) — one input, one output
• Construction: hand-soldered through-hole components on copper-clad PCB
• Form factor: bare PCB card / module — no enclosure
• Handwritten labels:
  Condition: Used
  This 20 MHz 5-pole Bessel low pass filter card has been inspected and is in good used condition. The PCB shows typical handling wear consistent with lab or bench use. Both BNC connectors appear intact and undamaged. The hand-soldered through-hole components are all present and the board shows no signs of burnt or damaged components. Please view our photo set and contact us if you have any questions.