1140-A
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).
