Correlation Between Receive Operating Frequency and Electrical Frequency Synthesizer 2A14 RF Output Frequency

TM 11-5820-695-35

to obtain a 70 MHz if signal containing received

intelligence.

The correlation between the receive

operating frequency and electrical frequency synthesizer

2A14 rf output frequency is described below.

(1) When the thumbwheel switches on

2A14 are set to 4400.0 MHz (receive operating

frequency), the rf output frequency of 2A14 is 284.375

MHz. The 284.375 MHz signal is multiplied by 16 to

4550 MHz by the times 16 multiplier chain in Receiver,

Radio R-1467/GRC144. The 4560 MHz signal is then

mixed with a 220 MHz signal. Frequency selective

circuits in the R-1467/GRC-144 select the lower

sideband (4550 MHz minus 220 MHz) produced by the

mixing process to obtain a 4330 MHz local oscillator

signal. The 4330 MHz signal is then mixed with the

4400 MHz incoming signal (receive operating

frequency). Frequency selective circuits in the R-

c. Correlation Between Transmit Operating

1467/GRC-144 select the lower sideband (440 MHz

Frequency and Electrical Frequency Synthesizer 1A14

minus 4330 producing the required 70 MHz if. Signal

RF Output Frequency. The correlation between the

which contains the received intelligence.

transmit operating frequency and the electrical

(2) When the thumbwheel switches on 2A21

synthesizer 1A14 rf output frequency is described below.

are set to 4700.0 MHz (receive operating frequency),

(1) When the thumbwheel switches on

the rf output of electrical frequency synthesizer 2A14 is

1A14 are set to 4400.0 MHz (transmit operating

284.375 MHz. The 284.375 MHz signal is multiplied by

frequency), the rf output frequency of 1A14 is 284.375

16 to 4550 MHz by the times 16 multiplier chain in the

MHz. The 284.375 MHz signal is multiplied by 16 to a

R-1467/ GRC-144 and mixed with 220 MHz as

4550 MHz local oscillator signal by the times 16

described above. However, in order to obtain the

frequency multiplier chain in Transmitter, Radio T-

correct receiver local oscillator frequency (4770 MHz),

'1054/GRC-144. The 4650 MHz local oscillator signal is

frequency selective circuits select the upper sideband

then mixed with a 150 MHz frequency modulated signal

(4650 MHz plus 220 MHz). The 4770 MHz local

containing the integence to be transmitted. Frequency

oscillator frequency is then mixed with the 4700 MHz

selective circuits in the T-1054/GRC-144 select the

incoming signal (receive operating frequency).

lower sideband (4550 MHz minus 150 MHz) produced

Frequency selective circuits in the R-1467/GRC-144

by the mixing process to obtain the selected 4400 MHz

then select the lower sideband (4770 MHz minus 4700

(4.4 GHz) transmit operating frequency.

MHz) producing the required 70 MHz if signal which

(2) When the thumbwheel swtches on lA14

contains the received intelligence.

are set to 4700.0 MHz (transmit operating frequency),

e. Overall Block Diagram Description of Electrical

the rf output of 1A14 is 284.375 MHz. The 284.375

Frequency Synthesizer 1A14/2A14 (fig. 512). The main

MHz signal is multiplied by 16 to a 4550 MHz local

signal flow (heavy lines on diagram) between plug-in

oscillator signal and mixed with 150 MHz as described

components (Al through A7) is shown. The dc power

above. However, to obtain the 4700 MHz (4.7 GHz)

distribution from power supply AS to components Al

transmit operating frequency, frequency selective

through A7 is also shown.

Each component is

circuits in the T-1054/GRC-144 select the upper

represented by a block on the diagram. Main chassis

sideband (4550 MHz plus 160 MHz).

circuits (e.g., thumbwheel switches) are also shown as

d. Correlation

Between

Receive

Operating

blocks on the diagram. The following subparagraphs

Frequency and Electrical Frequency Synthesizer 2A14

describe the main signal flow through electrical

RF Output Frequency. The thumbwheel switches on

frequency synthesizer 1A14.

The description also

electrical frequency synthesizer 2A14 are set to the

applies to electrical frequency synthesizer 2A14, except

desired receive operating frequency within the range of

the reference designations are prefixed with 1A14

4400.0 MHz to 5000.0 MHz.

The corresponding

instead of 2A14 and the word transmitter is used instead

electrical frequency synthesizer rf output frequencies

of receiver.

are the same as described in b above. The incoming

receive operating frequency is used as a mixing signal

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