KR 87-style ADF
A classic Bendix/King-style ADF receiver: active (USE) and standby frequencies in orange gas-discharge digits, FRQ to swap them, a dual knob to tune. FLT/ET shows a flight timer or an elapsed timer in place of the standby.
- Modeled on
- Bendix/King KR 87-style ADF receiver
- 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
Features
- USE (active) and FRQ (standby) frequencies in kHz
- Dual knob tunes the standby: outer 10 kHz, inner 1 kHz
- FRQ key (or a tap on the knob) swaps active and standby
- FLT/ET cycles the right side: standby frequency, flight time, elapsed timer; SET/RST resets the elapsed timer
- ADF/ANT and BFO annunciators toggled by their keys (display only)
- Gas-discharge digits dimmed 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)
On the iPad
- Drag the dual knob: outside ring 10 kHz steps, middle 1 kHz
- Tap the knob or FRQ to swap
- Tap FLT/ET to change what the right side shows; SET/RST to restart the elapsed timer
- Tap ADF or BFO to toggle their annunciators
Keys and controllers
Map any of these to a key, a game controller's button or axis, or a MIDI knob (how):
- ADF +
- ADF -
- ADF 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 |
|---|---|---|
| ADF active frequency (kHz) | ADF ACTIVE FREQUENCY:1 (kilohertz) | sim/cockpit2/radios/actuators/adf1_frequency_hz |
| ADF standby frequency (kHz) | ADF STANDBY FREQUENCY:1 (kilohertz) | sim/cockpit2/radios/actuators/adf1_standby_frequency_hz |
Sends
| When you… | MSFS | X-Plane |
|---|---|---|
| Turning the dual knob (outer x10 + inner kHz steps) | ADF_STBY_SET | sim/cockpit2/radios/actuators/adf1_standby_frequency_hz |
| FRQ key or tapping the dual knob | ADF1_RADIO_SWAP | sim/radios/adf1_standy_flip |
Add-on aircraft with their own systems may use other variables; the Hub reads the standard ones.
Changes
The instrument's version counts what its faces share (the case, the mechanism, the data, the sounds); a face's own version counts that face alone.
- 1.0 2026-10-19
- First numbered version.
