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(1) Record the current active frequency.
(2) Turn the radio OFF.
(3) Reposition the kHz spacing switch to the desired spacing, e.g., from
25 kHz to 8.33 kHz, or vice versa.
(4) Turn the radio ON.
With 8.33 kHz spacing enabled for tuning and an 8.33 kHz frequency
tuned, the actual frequency is not displayed. Rather, a “channel” or “code”
is displayed that coincides with the frequency change as received from
ATC. Additionally, the 100 MHz digit (the “constant 1”) is not displayed
when 8.33 kHz spacing is enabled. An example of actual frequency versus
displayed frequency is shown on the table that follows.
Because of the nature of the bandwidth differences between 25 kHz
spacing and 8.33 kHz spacing, ATC may assign a frequency channel for a
25 kHz frquency when 8.33 kHz is selected for tuning. The result is that the
displayed frequency may differ slightly from the actual frequency, e.g., the
displayed frequencies of either 132.000 and 132.005 result in the same
actual frequency of 132.0000. See the following table:
8.33 kHz SPACING: GABLES DIGITAL FREQUENCY CONTROL UNIT
Actual Frequency Tuning Spacing Displayed Frequency
132.0000 25 or 8.33 32.000 or 32.005
132.0083 8.33 32.010
132.0166 8.33 32.015
132.0250 25 or 8.33 32.025 or 32.030
132.0333 8.33 32.035
132.0416 8.33 32.040
132.0500 25 or 8.33 32.050 or 32.055
132.0583 8.33 32.060
132.0666 8.33 32.065
132.0750 25 or 8.33 32.075 or 32.080
G. TX Indicator:
Green in color, the TX indicator provides an indication that the COMM
Push-To-Talk (PTT) line is active.
H. TEST Switch:
The TEST switch has no effect on any other output conditions. When
depressed, the following actions occur:
• Functional test status on the control head is transmitted
• Test indicator located in the TEST switch is illuminated
• All segments and decimal points of the active and preselect displays
are illuminated
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS 2A-23-00
Page 7
May 30/02
Revision 7
I. Circuit Breakers (CBs):
The VHF communications system is protected by the following CBs:
Circuit Breaker Name: CB Panel: Location: Power Source:
VHF COMM CONT #1 CP H-10 FWD EMER BATT Bus
VHF COMM CONT #2 CP I-10 R Main DC Bus
VHF COMM #1 CP H-9 FWD EMER BATT Bus
VHF COMM #2 CP I-9 R Main DC Bus
J. Advisory (Blue) CAS Messages:
CAS Message: Cause or Meaning:
VHF COMM 1-2-3 FAIL (1) Indicated VHF communications radio has
failed.
NOTE(S):
(1) A third system may be installed as an outfitting option.
4. Limitations:
A. Flight Manual Limitations:
There are no limitations for the VHF communications system at the time of
this revision.
B. Pilot’s Manuals:
Consult the Collins RTU-4200 Series Pilot’s Guide, Collins Publication
Number 523-0777-900, Revision 2, dated May 1, 1996 (including
Addendum 2, dated June 16, 1998) for general operating procedures of the
VHF-422 transceivers.
OPERATING MANUAL
2A-23-00 PRODUCTION AIRCRAFT SYSTEMS
Page 8
May 30/02
Revision 7
Gables Digital Frequency
Control Unit
Figure 2
OPERATING MANUAL
2A-23-00
Page 9 / 10
May 30/02
2A-23-30: HF Communications System
1. Type of System Installed:
The type of High Frequency (HF) communications systems installed on GIV
aircraft is dependent upon aircraft production number. The two types of systems
are:
• Collins HF-190 Series (Aircraft SN 1000 through 1167, excluding 1034)
• Collins HF-9000 Series (Aircraft SN 1034, 1168 and subsequent)
2. General Description:
A. Collins HF-190 System:
The Collins HF-190 series communications system is a dualized full
frequency system designed to provide the flight crew with very long range
airborne voice and data communication. Operating in the 2.0000 to
29.9999 MHz frequency range with channel spacing of 100 Hz, it provides
280,000 discrete channels.
HF modes of operation are:
• EM LO: Emergency frequency selection - low
• EM HI: Emergency frequency selection - high
• NORM: Normal frequency selection
• MAR: Maritime channel selection
• PRE: User programmed channel selection
• PGM: Programs user selected channels
HF emission modes include:
• UV: Upper Side Band - Voice
• LV: Lower Side Band - Voice
• UD: Upper Side Band - Data
• LD: Lower Side Band - Data
• CW: Continuous Wave
• AM: Amplitude Modulation
NOTE:
The use of lower side band is legal for some
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湾流4操作手册 Gulfstream IV Operating Manual 1(50)
