Coastal marine VHF system: from 12 dB SINAD to 24 dB

A regional maritime authority operated three co-located VHF channels on adjacent towers along a 400 km coastline. Receiver SINAD measurements consistently fell below 12 dB during peak transmit hours, leaving large coverage gaps for safety-of-life calls.

ALUNOR RF deployed 6-Inch 6-Cavity VHF Duplexer (BPBR) at all three sites with custom factory tuning to the authority's exact Tx-Rx pairs. Our application team performed a pre-deployment sweep at each site, validated isolation in-situ, and trained local technicians on field re-tuning procedures.

Post-deployment SINAD averaged 24 dB across all three channels — a 12 dB improvement that recovered an estimated 35 km of effective range. The authority cited the project in a regulatory filing as evidence of best-practice infrastructure.