A-A-50760 Signal GeneratorRack mounted in the AN/APR-38 Test Set used to test/repair/align the Apr-38 Intermediate Frequency Processor (IFP).

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a. Frequency range

7.75 – 512 MHz in six bands

Band 1

248 MHz – 512 MHz

Band 2

124 MHz – 256 MHz

Band 3

62 MHz – 128 MHz

Band 4

31 MHz – 64 MHz

Band 5

15.5 MHz – 32 MHz

Band 6

7.75 MHz – 16 MHz

b. Frequency vernier range

> 300 ppm

c. Frequency resolution

Continuously tunable. Six digit frequency display with a least significant digit of 100 Hz (7.75 – 62 MHz) or 1kHz (62 – 512 MHz)

d. Frequency accuracy

Locked mode

± (0.05 of last digit time base accuracy)

Unlocked mode

± (last digit ± time base accuracy)

e. Time base accuracy

Standard

< ± 1 ppm after two hour warm up @ 25⁰C

Option

< ± 0.1 ppm after two hour warm up @ 25⁰C

f. Frequency stability

Lock

unlocked

Time (after two hr warm up)

<1 ppm/24 hrs.

<10 ppm/10 mins.

Temperature (0⁰C to 55⁰C)

<0.33 ppm/⁰C

<60 ppm/⁰C

(Option 0.03 ppm/⁰C)

Line voltage (± 10% change)

<1 ppm

<10 ppm