HF Flashcards
What is the function of the HF Radio Subsystem?
provide long-range secure and nonsecure voice and data communications;
enhance EAM injection by increasing redundancy;
back up the VLF TACAMO broadcast
Where is the HF 1 Antenna located?
wire antenna between the fuselage and vertical stabilizer
Where is the HF 2 Antenna located?
vertical fin on top aft section of vertical stabilizer
Where is the HF 3 Antenna located?
port wing tip probe
Where is the HF 4 Antenna located?
probe on top forward section of vertical stabilizer
Where is the HF 5 Antenna located?
starboard wing tip probe
What are the power requirements for the HF Antennae?
Passive
Where are the HF Radio Set Controls and how many are there?
HF 2-5 are in P30 Bays 2 & 3
HF 1 is on center aisle in flight deck
What are the power requirements for the HF Radio Set Controls?
9 VDC from respective R/T
What is the function of the HF Radio Set Controls?
provide serial, digital, remote control of the radio set and display faults and operational status
How many preset channels are available on the HF Radio Set Control and what are they?
30 presets
channels 00-29
How many possible channels can be accessed manually and what is the frequency range?
280,000 channels spaced at 100 Hz increments
from 2.0000 to 29.9999 MHz
What are the modes available on the HF Radio Set Control MODE Thumbwheel Selector?
Upper Sideband Voice (UV); Upper Sideband Data (UD); Lower Sideband Voice (LV); Lower Sideband Data (LD); Amplitude Modulation Equivalent (AM); Preset (P); Unidentified (A); Continuous Wave (CW)
A frequency selection below ____ will cause a CONT FAULT indication.
2.0000 MHz
Where is the HF FAULT/TUNE Panel located?
P30 Bay 3
What are the power requirements for the HF FAULT/TUNE Panel?
28 VDC from MISC CONT c/b on P 30 DISTR 2
What is the function of the HF FAULT/TUNE Panel?
provide remote monitoring of the fault status of each HF radio; allow disabling of auto-retuning function
Where is the HF Preselector Bandpass Filter located?
HF 2-5 = E43 Bay 1
HF-1 = E45, fwd lower lobe
What are the power requirements for the HF Preselector Bandpass Filter?
115 VAC 400 Hz from respective R/T
28 VDC from internal power supply of respective R/T
What is the function of the HF Preselector Bandpass Filter?
provide filtering for circuits and offer additional selectivity to receiver during reception and to Power Amplifier (PA) during transmission
Where is the HF Power Monitor Panel located?
P30 Bay 3; above second HF Radio Set Control
What are the power requirements for the HF Power Monitor Panel?
Passive
What is the function of the HF Power Monitor Panel?
to allow measurement of the forward (F) and reflected (R) power output of the HF-3, 4, & 5 R/Ts
Where are the HF R/Ts located?
HF 2-5 = E43 Bay 1
HF 1 = E45 cabinet, fwd lower lobe
