KX 155A-style NAV/COM

A classic Bendix/King-style NAV/COM with orange gas-discharge digits: COM and NAV, each active and standby, tuned by their dual knobs. Available as NAV/COM 1 or NAV/COM 2.

Modeled on: Bendix/King KX 155A-style NAV/COM
Category: Radios and panels
Size: 2 × 1 cells
Version: 1.0 · 2026-10-19
Plan: Pro
Simulators: MSFS 2020 · MSFS 2024 · X-Plane 11 · X-Plane 12

Variants

NAV/COM 1v1.0

COM 1 / NAV 1

Picker: RADIO > NAV/COM 1

NAV/COM 2v1.0

COM 2 / NAV 2

Picker: RADIO > NAV/COM 2

Features

Four frequencies in glowing orange seven-segment digits: COM active and standby, NAV active and standby
T shown while transmitting on this COM
White transfer keys swap active and standby (COM and NAV separately)
Dual knobs tune the standby: outer MHz, inner channel
PULL IDENT: tapping the NAV volume knob toggles that NAV's ident audio
Gas-discharge digits dimmed (not reddened) at night; dark without avionics power; the faceplate takes the red flood light and, when its dimmer is up, the glareshield's warm light (Settings > Dimmers > Glareshield, off by default)
Black faceplate in a thin silver frame, light gray keys

On the iPad

Drag the COM or NAV dual knob: outside ring for MHz, middle for the channel
Tap a dual knob to swap active and standby
Tap the white transfer (double arrow) keys to swap
Tap the small NAV knob (PULL IDENT) to toggle the NAV ident audio

Settings

Which radio: NAV/COM 1 or NAV/COM 2 (picker variant)

Keys and controllers

Map any of these to a key, a game controller's button or axis, or a MIDI knob (how):

COM 1 MHz +
COM 1 MHz -
COM 1 channel +
COM 1 channel -
COM 1 swap
NAV 1 MHz +
NAV 1 MHz -
NAV 1 channel +
NAV 1 channel -
NAV 1 swap

Simulator data

What the Hub reads from the simulator for this instrument, and what the instrument sends back. Names are the simulators' own: MSFS SimVars and events, X-Plane datarefs and commands.

Reads

Value	MSFS	X-Plane
COM1 active frequency (kHz)	`COM ACTIVE FREQUENCY:1 (MHz)`	`sim/cockpit2/radios/actuators/com1_frequency_hz_833`
COM1 standby frequency (kHz)	`COM STANDBY FREQUENCY:1 (MHz)`	`sim/cockpit2/radios/actuators/com1_standby_frequency_hz_833`
NAV1 active frequency (kHz)	`NAV ACTIVE FREQUENCY:1 (MHz)`	`sim/cockpit2/radios/actuators/nav1_frequency_hz`
NAV1 standby frequency (kHz)	`NAV STANDBY FREQUENCY:1 (MHz)`	`sim/cockpit2/radios/actuators/nav1_standby_frequency_hz`
COM2 active frequency (kHz)	`COM ACTIVE FREQUENCY:2 (MHz)`	`sim/cockpit2/radios/actuators/com2_frequency_hz_833`
COM2 standby frequency (kHz)	`COM STANDBY FREQUENCY:2 (MHz)`	`sim/cockpit2/radios/actuators/com2_standby_frequency_hz_833`
NAV2 active frequency (kHz)	`NAV ACTIVE FREQUENCY:2 (MHz)`	`sim/cockpit2/radios/actuators/nav2_frequency_hz`
NAV2 standby frequency (kHz)	`NAV STANDBY FREQUENCY:2 (MHz)`	`sim/cockpit2/radios/actuators/nav2_standby_frequency_hz`
COM transmitting: 1, 2, 0 none (enum)	`COM TRANSMIT:1 (bool)COM TRANSMIT:2 (bool)`	`sim/cockpit2/radios/actuators/audio_com_selection`

Sends

When you…	MSFS	X-Plane
COM dual knob outer (MHz); com1 + 1 inner (channel); com1 + 2 transfer key or knob tap (com2 on NAV/COM 2)	`COM_STBY_RADIO_SET_HZCOM_STBY_RADIO_SWAP`	`sim/cockpit2/radios/actuators/com1_standby_frequency_hz_833sim/radios/com1_standy_flip`
NAV dual knob outer (MHz); nav1 + 1 inner (channel); nav1 + 2 transfer key or knob tap (nav2 on NAV/COM 2)	`NAV1_STBY_SET_HZNAV1_RADIO_SWAP`	`sim/cockpit2/radios/actuators/nav1_standby_frequency_hzsim/radios/nav1_standy_flip`
Tapping the NAV volume knob (PULL IDENT): NAV 1 or NAV 2 ident audio	`RADIO_VOR1_IDENT_TOGGLERADIO_VOR2_IDENT_TOGGLERADIO_DME1_IDENT_TOGGLERADIO_ADF_IDENT_TOGGLEMARKER_SOUND_TOGGLETOGGLE_SPEAKER`	`sim/cockpit2/radios/actuators/audio_selection_nav1sim/cockpit2/radios/actuators/audio_selection_nav2sim/cockpit2/radios/actuators/audio_dme_enabledsim/cockpit2/radios/actuators/audio_selection_adf1sim/cockpit2/radios/actuators/audio_marker_enabled`