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The 65801818-2 RX Filter Board is a receiver filter printed circuit board used in Sperry Marine radar systems (notably X-band transceivers, such as Bridgemaster or VisionMaster series).
Its primary role is to filter incoming radar signals in the receiver (RX) path, ensuring only the desired X-band frequencies (around 9.3–9.5 GHz) are passed while suppressing unwanted noise, spurious signals, and out-of-band interference. This improves signal quality and target detection capability of the radar.
The board is a compact, marine-grade PCB assembly designed for installation inside the radar receiver unit. It is built to withstand shipboard environmental conditions such as vibration, humidity, and temperature variations. Many units are coated or ruggedized to comply with marine standards
| Parameter | Typical / Expected Value or Range | Notes & Considerations |
|---|---|---|
| Frequency band(s) | X-band radar frequency (≈ 9.3–9.5 GHz or in that region) | As part of the receiver front end, the filter board would pass the radar’s receive band and reject out-of-band interference |
| Type of filter | Bandpass / band-limiting filters, potential multiple stages | It may include ceramic filters, cavity filters, or microstrip filter networks |
| Insertion loss | Low, e.g. < a few dB in passband | For minimal signal degradation |
| Return loss | Good matching (e.g. > 15–20 dB) in passband | To ensure reflections are minimized |
| Rejection / attenuation | High attenuation outside passband | To block unwanted signals / interference |
| Power handling (input signal level) | Low — the RX signal is weak, so filter is for small signal levels | Not a power amplifier stage |
| Impedance | 50 Ω (likely) | Standard RF systems use 50-ohm impedance matching |
| Connector types | RF coax connectors (SMA, N connector, or proprietary radial) | Must match mating receiver connectors |
| Board weight | ~50 g (for Rev A variant) | Given by Aeliya Marine listing Aeliya |
| Board revision / version | Rev. A (as one listing indicates) | The board may have multiple revisions |
| Environmental / mechanical | Marine-grade PCB, conformal coating, temperature range, vibration tolerance | Must survive shipboard / radar environment |
| Size / form factor | (unknown) | Must fit the receiver assembly’s mechanical slot |
| Noise / distortion | Very low added noise or distortion | As part of the front end, the filter must preserve signal integrity |
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