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ACOM/IFT CAT 1 > UHF C3 > Flashcards

UHF C3 Flashcards

1
Q

What is the purpose of the UHF C3 Radio subsystem?

A

high-power, Line-of-Sight (LOS) airborne communications of voice & data

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2
Q

What is the frequency range of the UHF C3 Radio subsystem?

A

225.000 - 399.975 MHz

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3
Q

How many UHF C3 Antennae are there?

A

5

3 TX, 2 RX

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4
Q

Where are the UHF C3 Antennae located?

A

TX (1) - top FS 470; TX (2) - bottom FS470;
TX (3) - bottom FS 570; RX (4) - FS1150;
RX (5) - top/fwd of VLF/LF RX Antenna

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5
Q

What are the power requirements for the UHF C3 Antennae?

A

Passive

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6
Q

What is the function of the UHF C3 Antennae?

A

TX & RX voice & data; provide a nominal RF impedance of 50 Ohms over a 225 - 399.975 MHz frequency range; handle RF power of up to 1,500 W

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7
Q

Where are the UHF Control Panels located and how many are there?

A

2

P30 Bays 1& 2

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8
Q

What are the power requirements for the UHF Control Panels?

A

28 VDC from CONT 1 & 2 c/bs on P30 DISTR 2

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9
Q

What is the function of the UHF Control Panels?

A

to select and control individual RF, operating mode, and R/T output power

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10
Q

How many frequencies are selectable via the UHF Control Panels?

A

20 preset frequencies or 7,000 manual frequencies between 225.000 & 399.975 MHz selectable in 25 KHz increments

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11
Q

What are the 3 operating modes selectable via the UHF Control Panels?

A

Wideband Frequency modulated (WBFM) - Data
Narrowband Frequency Modulated (NBFM) - Data
Narrowband Amplitude Modulated (NBAM) - Voice

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12
Q

Where is the Auxiliary Control Panel (UHF C3 Aux Control Panel) located?

A

P30 Bay 2

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13
Q

What are the power requirements for the UHF C3 Aux Control Panel?

A

28 VDC from AUX CONT c/b on P30 DISTR 2

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14
Q

What is the function of the UHF C3 Aux Control Panel?

A

provide primary input power, associated equipment selection, control, and indications for UHF C3;
ON/OFF to HPA power supplies; momentary reset of DAISS; indicate link alarms for DAISS; upper & lower RX Antenna selection; selection of UHF Control 1 or 2

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15
Q

Where is the UHF C3 Mode Select Panel located?

A

P30 Bay 2

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16
Q

What are the power requirements for the UHF C3 Mode Select Panel?

A

28 VDC from MODE SEL c/b on P30 DISTR 2

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17
Q

What is the function of the UHF C3 Mode Select Panel?

A

provide the switching controls necessary to select which system will interface with the UHF C3 radios

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18
Q

Where is the Baseband Control Assembly (BCA) located?

A

C2 cabinet above the UHF C3 HPAs

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19
Q

What are the power requirements for the Baseband Control Assembly (BCA)?

A

28 VDC from BASE BAND CONT c/b on E60-2

20
Q

What is the function of the Baseband Control Assebmly (BCA)?

A

monitors & conditions baseband noise & modem automatic gain control levels to provide discrete signal control over BCA squelching circuitry;
patching capability

21
Q

Where is the UHF C3 Power Meter located?

A

P30 Bay 4, above MCS Display

22
Q

What are the power requirements for the UHF C3 Power Meter?

A

Passive

23
Q

What is the function of the UHF C3 Power Meter?

A

indicate forward power (F) or reflected power (R) for selected UHF C3 radio (1, 2, or 3)

24
Q

Each power sensor for the UHF C3 Power Meter contains ____?

A

2,500 W sensor element for measuring Forward

500 W sensor element for measuring Reflected

25
Q

Where are the UHF C3 R/Ts located and how many are there?

A

3 total

C2 cabinet

26
Q

What are the power requirements for the UHF C3 R/Ts?

A

115 VAC 400 Hz from R/T 1, 2, & 3 c/bs on E60-2

27
Q

What is the function of the UHF C3 R/Ts?

A

translate received RF signal to a 70 MHz Intermediate Frequency (IF) and send it to the Modems for demodulation; translate 70 MHz IF from Modem to selected UHF frequency, amplify, filter, & rout it to HPAs for TX

28
Q

Where is the 70 MHz Select Switch located?

A

C2 cabinet

29
Q

What are the power requirements for the 70 MHz Select Switch?

A

28 VDC from MODE SEL c/b on P30 DISTR 2;

functions with Mode Select Panel

30
Q

What is the function of the 70 MHz Select Switch?

A

to interface the UHF C3 with ALCS;
operate in response to Mode Select Panel, electronically selecting the UHF C3 receiver’s 70 MHz auxiliary channel to be used for the ALCS

31
Q

Where are the UHF C3 HPAs located and how many are there?

A

3 total

C2 cabinet

32
Q

What are the power requirements for the UHF C3 HPAs?

A

115 VAC 400 Hz from HPA 1, 2, & 3 on E60-2

33
Q

What is the function of the UHF C3 HPAs?

A

deliver 1 KW over a 225.000 - 399.975 MHz frequency range into a 50 Ohm load; amplify TX signal to supply RF power to an unassociated TX antenna

34
Q

The UHF C3 HPAs amplify TX signal to supply ______ or ______ of RF power to an unassociated UHF C3 TX Antenna.

A 
250 W (AM);
1000 W (FM)
35
Q

Where are the UHF C3 Modems located and how many are there?

A

3 total

C2 cabinet

36
Q

What are the power requirements for the UHF C3 Modems?

A

115 VAC 400 Hz from MODEM 1, 2, & 3 c/bs on E60-2

28 VDC from MODEM 1, 2, & 3 c/bs on E60-2

37
Q

What is the function of the UHF C3 Modems?

A

interface with the UHF Control Panels;

provide radio power ON/OFF, tuning, R/T enable, self-test, fault detection, and mode of operation

38
Q

Where is the UHF C3 Multicoupler/Receive Bandpass Filters located?

A

Rear of P20 Bay 1

39
Q

What are the power requirements for the UHF C3 Multicoupler/Receive Bandpass Filters?

A

28 VDC from RCVR FLTR 1, 2, & 3 c/bs on P20 DISTR 1A

40
Q

What is the function of the UHF C3 Multicoupler/Receive Bandpass Filters?

A

to receive 1 input signal and split it into 3 signals, allowing the use of a single RX antenna

41
Q

The UHF C3 Multicoupler consists of 2 Bandpass Filters, one with a _____ bandpass for widebandsignals and the other with a _____ bandpass for narrowband signals.

A
  1. 8 - 298 MHz

314. 9 - 400 MHz

42
Q

Where are the UHF C3 Transmit Bandpass Filters located and how many are there?

A 
3 total
C2 cabinet (top shelf)
43
Q

What are the power requirements for the UHF C3 Transmit Bandpass Filters?

A

28 VDC from XMTR FLTR 1, 2, & 3 c/bs on E60-2

44
Q

What is the function of the UHF C3 Transmit Bandpass Filters?

A

to take the transmit RF from the R/Ts and route it to the UHF C3 HPAs for amplification

45
Q

Where is the UHF C3 Receive Preampfilter located?

A

Rear of P20 Bay 2

46
Q

What are the power requirements for the UHF C3 Receive Preampfilter?

A

28 VDC from PRE AMP c/b on P20 DISTR 1A

47
Q

What is the function of the UHF C3 Receive Preampfilter?

A

amplifies the received RF signals from each Receive Bandpass Filter before routing them to the R/Ts for the applicable receiver system

ACOM/IFT CAT 1 (27 decks)

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