Figure 5-2. Basic delay measuring system.

TM 11-6625-922-15

with signal No. 4 to provide an output signal in the 0.1

heterodyne method for providing the output signal. A

variable frequency signal (1) is generated in the variable

kHz to 50 kHz range (7). Signal range (6) or (7) is then

selected by switch S3 and output amplifier A12 amplifies

frequency oscillator assembly (A2) which is buffered in

A16 to provide 2-2.6 MHz and 200 kHz-260 kHz range

the modulated signal and sends it to the TRANSMIT

output.

signals (3 and 4). The 2 MHz oscillator (A4) provides a

stable 2 MHz signal (2) which is divided by 10 in A10 to

Modulation Frequency Generation.

The

provide a 200 kHz signal (5). Signal No. 2 is modulated

in A14 and then heterodyned with signal No. 3 to give

modulating frequencies of 25 Hz, 83 1/3 Hz, and 250 Hz

an output signal in the 50 kHz to 552 kHz range (6).

are generated by digital logic division from

Signal No. 5 is modulated in A15 and then heterodyned

Figure 5-1. Time Delay.

Figure 5-2. Basic delay measuring system.

5-2