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558: Difference between revisions
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|model=558 | |model=558 | ||
|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 | ||
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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 absportion 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 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 thev [358]]. Each wavemeter is supplied with a calibration chart produced with settings accurate for that particular meter. | ||
==Specifications== | ==Specifications== | ||
* '''Frequency Range:''' 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 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% | * '''Frequency Calibration Accuracy:''' 0.25% | ||