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The '''General Radio 558 Amateur Band Frequency Meter''' was introduced in 1928 Bulletin 930 and Catalogs E1 and E2. | The '''General Radio 558 Amateur Band Frequency Meter''' was introduced in 1928 Bulletin 930 and Catalogs E1 and E2. | ||
The Type 558 is an | The Type 558 is an absorption type wavemeter covering the five popular amateur radio bands. Its an improved version | ||
of the earlier [[358]] wavemeter with .25% accuracy as compared to 1% of the [[358]] and the inclusion of fifth VHF band coil. The 558 uses a neon type resonance indicator which is change from the incandescent lamp used by | of the earlier [[358]] wavemeter targeted for amateur radio use with .25% accuracy as compared to 1% of the [[358]] and the inclusion of fifth VHF band coil. The 558 uses a neon type resonance indicator which is change from the incandescent lamp used by the [[358]]. Each wavemeter is supplied with a calibration chart produced with settings accurate for that particular meter. | ||
==Specifications== | ==Specifications== | ||