558: Difference between revisions
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{{GR Product | {{GR Product | ||
|model=558 | |model=558 | ||
|codes=UNION | |||
|class=frequency standards and meters | |class=frequency standards and meters | ||
|summary= | |summary=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 | ||
|series= | |series=558 | ||
|introduced=1928 | |introduced=1928 | ||
|discontinued=1929 | |discontinued=1929 | ||
| Line 12: | Line 13: | ||
* [[Media:GR 558 Wavemeter 500-11-15-28.pdf|558 Instruction Card 500-11-15-28]] | * [[Media:GR 558 Wavemeter 500-11-15-28.pdf|558 Instruction Card 500-11-15-28]] | ||
{{Catalog History}} | {{Catalog History}} | ||
}} | }} | ||
The | The {{Title|General Radio 558 Amateur Band Frequency Meter}} was introduced in {{Bulletin 930}} and {{Catalog E1}} / {{Catalog E2}}. | ||
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. | ||
of the earlier [[358]] wavemeter | |||
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== | ==Specifications== | ||
Latest revision as of 00:25, 25 August 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%
