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|codes=UNION | |codes=UNION | ||
|class=frequency standards and meters | |class=frequency standards and meters | ||
|summary=frequency meter | |summary=Amateur band frequency meter | ||
|image=GR 558 Case Open A.jpg | |image=GR 558 Case Open A.jpg | ||
|caption=General Radio 558 Amateur Band Frequency Meter | |caption=General Radio 558 Amateur Band Frequency Meter | ||
Revision as of 18:47, 16 April 2024
The General Radio 558 Amateur Band Frequency Meter was introduced in Bulletin 930 (1928) and Catalog E1 (1928) / Catalog E2 (1928).
The Type 558 is an absorption-type wavemeter covering the five popular amateur radio bands.
It is an improved version of the earlier 358 wavemeter, targeted for amateur radio use with 0.25% accuracy as compared to 1% of the 358, and the inclusion of fifth VHF band coil. Each wavemeter is supplied with a calibration chart produced with settings accurate for that particular meter.
The 558 uses a neon-type resonance indicator instead of the 358's incandescent lamp.
Specifications
- Frequency Range: five bands, 3.5 to 4.0 MHz, 7.0 to 8.0 MHz, 14.0 to 16.0 MHz, 28 to 32 MHZ, 56 to 51 MHz
- Frequency Calibration Accuracy: 0.25%
