Double Peaked Amplifier.
DEPARTMENT OF THE ARMY WASHINGTON DC
Pagination or Media Count:
An audio frequency amplifier selectively responsive to a band of Doppler frequencies comprising an electron tube having at least grid, anode and cathode elements, a three pi network connecting said electron tube anode and grid elements, said network providing inphase feedback producing maximum gain at peak high frequency of said Doppler band, an output circuit for said audio frequency amplifier, an input circuit for said audio frequency amplifier, a high frequency peak gain control comprising a capacitor coupling said output circuit and grid element of said electron tube, said gain control producing negative feedback and thereby controlling the high frequency peak gain of said audio frequency amplifier, an isolating resistor in series with said capacitor and said output circuit, said isolating resistor functioning to isolate said capacitor will affect only the gain and not the peak frequency of said network, said input circuit including input terminals, a variable resistor, capacitor and inductor series connected across said input terminals, and means connecting the grid-cathode circuit of said electron tube across said inductor, whereby frequencies below the low frequency end of said band are sharply surpressed, said variable resistor being adjustable to increas the impedance of said input circuit and thereby interact with the said peak high frequency gain to increase the effectiveness of said network.
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