1140-A: Difference between revisions
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The {{Title|General Radio 1140-A UHF Wavemeter}} was introduced in {{Catalog L}} and remained available through {{Catalog N}}. | The {{Title|General Radio 1140-A UHF Wavemeter}} was introduced in {{Catalog L}} and remained available through {{Catalog N}}. | ||
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 | 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 is called a [[butterfly circuit]] which varies capacitance and inductance simultaneously to attain resonance. Resonance is indicated with a microammeter. | ||
==Specifications== | ==Specifications== | ||
Latest revision as of 20:07, 28 May 2024
The General Radio 1140-A UHF Wavemeter was introduced in Catalog L (1948) 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 is called a butterfly circuit which varies capacitance and inductance simultaneously to attain resonance. Resonance is indicated with a microammeter.
Specifications
- Frequency Range: 240-1200 MHz in one range
- Accuracy: ±2% of the indicated frequency
- Detector: A type 1N22 Crystal Detector (Microwave Diode)
