Title: Radar RF generator including a stable local oscillator and an exciter circuit

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Claims: What is claimed is:

1. A RF generator for a radar system comprising:

an oscillator including a crystal for generating a predetermined VHF signal,

a multiplier for multiplying said VHF signal to a desired RF signal,

amplifying circuitry for amplifying said RF signal,

a first isolator for preventing passage of signals to the output of said amplifying circuitry while allowing passage of said RF signal,

a filter connected to the output of said first isolator including plural cavities for filtering all but a selected narrow bandwidth signal from said RF signal,

a power divider for dividing said narrow bandwidth signal to provide a stable local oscillator signal and an exciter signal,

a second isolator connected to pass said exciter signal,

a high pass filter for filtering said exciter signal,

a coherent oscillator for generating a stable coherent oscillator signal,

a transmit switch for gating said coherent oscillator signal in response to a radar timing signal,

a mixer for mixing the gated coherent oscillator signal with the filtered exciter signal,

a bandpass filter for passing a selected one of the upper and lower side bands of the output from said mixer,

an exciter amplifier for amplifying the output of said bandpass filter, and

a third isolator connected to pass the output of said exciter amplifier.

2. The RF generator of claim 1 and further comprising:

means for sensing operation of said multiplier, and

meter means for displaying the operation of said multiplier.

3. The RF generator of claim 1 and further comprising means for tuning said multiplier to multiply said VHF signal to any one of a plurality of RF signals.

4. The RF generator of claim 1 wherein said filter includes means for adjusting the selected narrow bandwidth.

5. The RF generator of claim 1 wherein said power divider comprises a resistive network having a pair of outputs.

6. The RF generator of claim 1 and further comprising:

means for detecting said stable local oscillator signal, and

meter means for displaying an indication of said oscillator signal.

7. The RF generator of claim 1 wherein said transmit switch includes back-to-back diodes for gating said coherent oscillator signal.

8. The RF generator of claim 1 and further comprising:

a sourse of a continuous wave signal,

a switch connected to the source of the radar timing signal and said transmit switch and operable to disconnect the radar timing signal and to connect said source of the continuous wave signal to said transmit switch, wherein the continuous wave signal enables alignment of the radar exciter, and

means for sensing the application of the continuous wave signal to said transmit switch.

9. An RF generator for generating a predetermined RF signal comprising:

an oscillator including a removable crystal for generating a preselected VHF signal,

a multiplier coupled to the oscillator output for multiplying said VHF signal to a desired RF signal,

a power amplifier coupled to the multiplier for enhancing the strength of the desired RF signal, said power amplifier including a tuning means for fine tuning the desired RF signal,

a tunable bandpass filter for selecting a desired bandpass signal from said RF signal and attenuating the nonselected signal,

a power divider coupled to the tunable bandpass filter for dividing the selected bandpass signal into a plurality of selected signals including a signal for an exciter, and

an exciter coupled to the power divider for producing exciter signals, said exciter including a coherent oscillator for generating a coherent signal, means coupled to the coherent oscillator and power divider for selectively mixing the coherent oscillator signal with the signal of the power divider for the exciter, and means for passing a selected side band of the mixed RF signals as an exciter signal.

10. An RF generator according to claim 9 wherein the means coupled to the coherent oscillator and power divider for selectively mixing the coherent oscillator signal with the signal of the power divider for the exciter includes a gating switch coupled to the coherent oscillator for gating said coherent oscillator signal in response to a timing signal, and a doubly balanced mixer for mixing the gated coherent oscillator signal with the filtered RF signal.

11. An RF generator according to claim 9 wherein the means for passing a selected side band of the mixed RF signals as an exciter signal includes a tunable bandpass filter for passing a selected one of the upper or lower side bands of the output from said mixer.

Other info:

Inventors: Delzer, Dennis Richard (Richardson, TX, US)

Application Number: 427900
Filing Date: 1973-12-26
Publication_date: 1976-05-04
Assignee: Texas Instruments Incorporated (Dallas, TX)
Primary Class(es): 342/165 327/141, 342/173
Other Classes:
US Patent Ref:

2802105	Aug, 1957	Odden	328/63.
2935609	May, 1960	Rabin et al.	328/63.
2948879	Aug, 1960	Padber, Jr. et al.	328/63.
3263228	Jul, 1966	Abrahams et al.	343/17.
3354457	Nov, 1967	Pfab et al.	343/17.
3427615	Feb, 1969	Hubka	343/17.
3774206	Nov, 1973	Rauch	343/17.

Other Refs:
Primary Examiner: Hubler, Malcolm F.
Assistant Examiner:
Attorney: Levine; Harold, Grossman; Rene' E., Bandy; Alva H.