UHF FM receiver having improved frequency stability and low RFI emission
Patent
·
OSTI ID:6661605
This patent describes a UHF receiver which converts UHF modulated carrier signals to baseband video signals without any heterodyne or frequency conversion stages. A bandpass filter having a fixed frequency first filters the signals. A low noise amplifier amplifies the filtered signal and applies the signal through further amplification stages to a limited FM demodulator circuit. The UHF signal is directly converted to a baseband video signal. The baseband video signal is clamped by a clamping circuit before driving a monitor. Frequency stability for the receivers is at a theoretical maximum, and interference to adjacent receivers is eliminated due to the absence of a local oscillator.
- Assignee:
- Dept. of Energy, Washington, DC (USA)
- Patent Number(s):
- A; US 4905087
- Application Number:
- PPN: US 7-237191A
- OSTI ID:
- 6661605
- Country of Publication:
- United States
- Language:
- English
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