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The HF transceiver units (HF COM 1 and HF COM 2) are located in the Aft Avionics Bay. The HF antenna coupler units are located in the upper Aft Fuselage. The antenna is located in the Vertical Stabilizer (forms the leading edge).
The RMUs are the central control for the HF Communication System, providing complete capability for controlling the operational mode and frequencies. Each RMU has the capability to control operation of its primary (on-side) radio or its secondary (cross-side) radio.
The HF information on each RMU is displayed at the lower right of the radio tuning page. HF emission mode and status are displayed in the HF window. In order to tune a frequency on HF, one of the two line select keys on the lower right side of the RMU is pressed. This selection will place the “cursor tune box”around the frequency to be tuned and using the RMU tuning knobs will accomplish the desired frequency. The HF System can operate in the following modes: Upper Sideband Voice (UV), Lower Sideband Voice (LV), Amplitude Modulation Equivalent (AM) and Continuous Wave (CW).
RMU HF DISPLAY
HF Line Select Keys
GF0610_045
Cursor Box
Rev 3, Apr 25, 2005 Flight Crew Operating Manual Volume 2
The RMU HF window is optimized for use with Upper Sideband voice mode. The HF window has two modes of operation: Preset Tune mode and Direct Tune mode. Both the active and preset are displayed when the RMU is in preset tune mode, while only the active frequency is displayed in direct tune mode.
The HF will keep the most recently keyed HF tuned to the antenna for 20 seconds after the push-to-talk key opens. Following 20 seconds the HF reverts to “Dual Receive mode”(neither HF antenna remains tuned to the antenna) providing the squelch is not open.
HF Preset and Direct Tuning Modes
HF 1 Preset Mode HF 1 Active Mode
When the coupler is tuning to match the antenna, a steady tone will be heard from the transceiver. If tuning takes longer than six seconds, the tone will begin to beep, signaling that the coupler was not able to tune properly. If this occurs, an “ERR”annunciator is displayed and the frequency data will dash (. . . . .) on the RMU HF window. To clear this fault, tune any HF parameter on the RMU. For information on additional message annunciations, refer to the manufacturer pilot handbook on HF communication.
HF Fault Annunciation
GF0610_047
HF communication control and status are accessed and/or displayed on “back”pages of the RMU. These pages are accessed via RMU “PAGE MENU”page:
.
HF Control Page.
.
HF Memory Page.
.
Maintenance Log.
Volume 2 Flight Crew Operating Manual Rev 3, Apr 25, 2005
Menu Page
The menu page is accessed from the radio tuning page by pressing the “PAGE”function key on the front face of the RMU. All stored frequencies are displayed and there are six memory locations on the first page and an additional six available on the second page.
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