Receive Path - TM-11-5820-695-350038

TM 11-5820-695-35

(3rd mult) within 1A9 and applied to the metering

156/U, Telephone Set TA-312/PT, the loudspeaker, and

back (thru ow send) to the radio-to-cable circuits in

circuits.

1A12.

(5) The 4.55 to 4.85 Hz signal is mixed

(2) The RADIO TO CABLE MODEM

with the 150 MHz frequency modulated signal

indicator on meter panel assembly 1A15A8 and an

(containing the data signal and orderwire) in transmitter

external traffic out indicator are controlled by the radio-

frequency mixer stage 1A9 to produce the 4.4 to 5.0

to-cable circuits of 1A12 through the radio patch panel.

GHz carrier output signal which is applied to rf bandpass

For normal output data traffic conditions, the RADIO TO

filter 1FL3. The bandpass filter is set to the required

CABLE MODEM and the external traffic out indicators

carrier frequency. The lower side band frequency (local

are lighted green. If an output data traffic failure is

oscillator minus 150 MHz) is selected for the low band of

detected by the radio-to-cable circuits in 1A12, the

carrier output frequencies (4400 to 4699.9 MHz). The

CNTRL ALARM and external traffic out indicators light

upper sideband frequency (local oscillator plus 150

red. The RADIO TO CABLE MODEM indicator lights

MHz) is selected for the high band of output frequencies

red only when a functional failure exists in 1A12 and

(4.7 to 5.0 GHz). The selected carrier frequency is

actual data traffic is present. If data traffic is not

passed through rf low pass filter 1FL4 to directional

present, this alarm is inhibited (remains green) even if a

coupler 1DC1. The main output of the directional

functional failure exists.

coupler is applied to Switch, Waveguide SA-1679/GRC.

A secondary output is sent to the radio test set. The

RADIO TEST SET indicator on 1A15A8 lights red when

(3) A normally energized relay in

the radio test set is turned on and green when it is

orderwire assembly 1A13 is controlled by the recovered

turned off. In addition, detected forward and reflected rf

ow sense signal from the radio-to-cable circuits in 1A12.

power signals are sent from 1DC1 to alarm monitor 1A5

If the data portion of the input signal from Radio,

and to the metering circuits in 1A15A8. For normal

Receiver R-1467(P)A/GRC-144(V) is missing, the relay

conditions, the RF POWER and REFL RF POWER

becomes deenergized. With the relay deenergized, the

indicators are lighted green. A loss of rf power output or

orderwire signal received from the R-1467(P)A/GRC-

a high level of reflected power will cause the associated

144(V) is applied to the orderwire circuits in place of the

indicator and the CNTRL ALARM indicator to light red.

recovered ow signal from 1A12.

Thus, orderwire

communication is maintained when the pcm traffic

portion of the signal from the R-1467(P)A/GRC-144(V)

Receive Path. In the receive (radio-to-

is lost.

cable) signal path through the T-1054(P)A/GRC-144(V),

the combined data and ow signal from Receiver, Radio

(4) A receiver alarm signal is also

R-1467(P)A/GRC-144(V) is applied to the radio-to-cable

applied to the alarm circuit in 1A13 from the R-

circuits of 1A12 through orderwire assembly 1A13 and

1467(P)A/GRC-144(V). If an alarm condition is present

the radio patch panel.

in the R-1467(P)A/GRC-144(V), this signal will cause

the CNTRL ALARM indicator on 1A15A8 to light red and

(1) The radio-to-cable circuits separate

the loudspeaker to sound an audible alarm.

the reshaped and retimed data for application to the

cable system. The recovered ow signal is amplified and

(5) The data alarm signal from digital

fed back to 1A13 through the radio patch panel along

data combiner 1A12 summaries the alarm conditions

with the recovered ow sense signal. The recovered ow

within 1A12. It is

signal is amplified in 1A13 and distributed to Handset H-

Change 6 2-6.3/(2-6.4 blank)