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1140-A: Difference between revisions
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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. | ||
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 | 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 attain resonance. Resonance is indicated with a microammeter. | ||
==Specifications== | ==Specifications== | ||