1140-A: Difference between revisions
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{{Catalog History}} | |||
* [[Media:GRwiki Catalog L OCR 1948.pdf|L (1948)]], p.196 | |||
* [[Media:GRwiki Catalog M OCR 1951.pdf|M (1951)]], p.218 | |||
* [[Media:GRwiki Catalog N OCR 1954.pdf|N (1954)]], p.224 | |||
}} | }} | ||
The '''General Radio 1140-A UHF Wavemeter''' introduced in 1948 Catalog L and remained available through Catalog N 1954. | The '''General Radio 1140-A UHF Wavemeter''' introduced in 1948 Catalog L and remained available through Catalog N 1954. | ||
Revision as of 19:33, 29 March 2024
The General Radio 1140-A UHF Wavemeter introduced in 1948 Catalog L and remained available through Catalog N 1954.
The 1140-A is a simple device to measure frequency in the UHF range of 240 to 1200 MHz with 2% accuracy. Behind the rear window is what's called a Butterfly circuit which varies capacitance and inductance simultaneously to atain resonance. Resonance is indicated with a micro ammeter.
Specifications
- Frequency Range: 240-1200 MHz in one range.
- Accuracy: ±2% of the indicated frequency.
- Detector: A type 1N22 Crystal Detector (Microwave Diode).
