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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. The variable condenser used is a [[ | 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. | ||
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GR 558 Tuning Unit Close-up.jpg | GR 558 Tuning Unit Close-up.jpg | ||
GR 558 Tuning Unit Close-up A.jpg | GR 558 Tuning Unit Close-up A.jpg | ||
GR Condenser Brace Top.jpg | |||
GR Condenser Brace Bottom.jpg | |||
GR Condenser Brace Side.jpg | |||
</gallery> | </gallery> | ||
[[Category:Frequency Standards and Meters]] | [[Category:Frequency Standards and Meters]] | ||
Latest revision as of 08:50, 2 October 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 variable condenser used is a Type 557.
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%
