A practical VLFLF radio test system designated as the ANURM-212, Test Set, Radio is a recent development of the Naval Ocean Systems Center working in conjunction with industry. The mission of the ANURM-212 is to verify the operational readiness of VLFLF receive communication systems installed in submarines. Navy aircraft, and tenders from antenna to printer. The ANURM-212 tests processor-controlled VLFLF receive components e.g., VERDIN, in a quantitative manner and tests non-processor controlled VLFLF receive components e.g., receivers, antennas and associated couplers in a qualitative manner. The ANURM-212 is used to test all receive components of the VLFLF communications system by measuring small performance degradations not discovered by automated performance monitoring, self test or other preventive maintenance procedures. Keywords VLF system resident software, Communication systems, and Radio Test Unit RTU.