CRS FIRST AND SECOND IF. AMPLIFIER A3400/CRS THIRD IF. AMPLIFIER AND LIMITER A3500

TM 11-5820-670-30

1-17. CRS FIRST AND SECOND IF. AMPLIFIER A3400/CRS THIRD IF. AMPLIFIER AND LIMITER

A3500.

EL1AT093

An intermediate frequency from the second mixer is applied to the first if. amplifier. The intermediate

frequency is approximately 5.65 MHz for all front panel decimal control settings which are even, such

as 30.00, 30.10, 30.20, etc. An if. of approximately 5.60 MHz is applied to the first if. amplifier for

all odd decimal control settings, such as 30.05, 30.15, 30.25, etc. if. inputs are given as approx-

imations because they vary in response to the local oscillator's frequency error.

Further amplification is provided by the second if. amplifier after which the signal is passed through

filter FL3004. The filter's band pass is narrow and therefore causes attenuation of any frequencies

other than the if. which might pass through first and second if. amplifier A3400.

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