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The Type 558 is an absorption-type wavemeter covering the five popular amateur radio bands. | 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. | 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 variable condenser used is a [[Type 557]]. | ||
The 558 uses a neon-type resonance indicator instead of the 358's incandescent lamp. | The 558 uses a neon-type resonance indicator instead of the 358's incandescent lamp. | ||