NDB Fractional frequency

User Support Hub ATC, Traffic & NAVAIDs
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I have not noticed this before but NDB (SWN) at Swamsea airport has a frequency of 320.5 kHz. Most of the aircraft I fly don’t allow the setting of the fraction (0.5) and recently in the BN-2 Islander setting 320 and 321 kHz did not allow me to lock the (SWN) NDB.

Is this is a limitation of the sim? sPK

Edit: I have done some testing using the 152 and empty community folder. This has the same problem as the BN-2 though this was tested at Cardiff (CDEF - 388.5 kHz). However if you look at the in game VFR map the NDB (CDEF) has a beacon frequency 388.0 kHz :thinking:

The VRF map also has the NDB (SWN) frequency of 320 kHz.

The reason I believed these NDBs had a factional frequency was from Little MapNav but LMN gets its data from FS20.

I wonder if the recent push to use real world data has resulted in faractional NDB frequencies and the current sim cannot handle this.

Edit 2: I’m sure this is a bug so I have raised this bug report: https://forums.flightsimulator.com/t/adf-cannot-be-set-to-detect-fractional-ndbs/661036

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Huddinson on YouTube did a video on this some time ago, there was a setting that I don’t remember

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Realistically speaking an NDB on a frequency of 320.5 should be able to be picked up on 320. I don’t think this is 100% a sim limitation because on my radio panel I can do fractions in any aircraft and pick it up. It’s just the sim doesn’t know it can pick up an NDB that is on 320.5 on 320. In the WBSim/JPLogistics Cessna 152 it will keep flipping between 0 and 5 (I notice this on my radio panel but not in the cockpit) until an NDB is picked up.

EDIT: Nevermind, it doesn’t work in every aircraft. It works in the default Cessna 152 but not the A2A Comanche. When I enter a .5 on my radio panel and then make it active it will go back to a 0. The G1000 NXi does support fractions.

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Thanks for that Tony. I have found the video I believe you are refering to. I hope this link will take you to the appropriate section: https://www.youtube-nocookie.com/embed/1jWE9PyEnr8

Basically you need to set a control input of keyboard binding to increase the frequency by 0.1 kHz:

  • Options > Control Options
  • Select the controller you want to use or the keyboard.
  • Filter to All
  • Radio > ADF
  • Now set a binding for the Increase ADF1 (0.1)

Note when you use this hack a ‘.’ appears the bottom right of the right digit in the ADF.

I still feel this is a hack as pointed out by:

I also note that some glass cockpits allow the ADF frequency resolution to be set to 0.25 kHz (I believe you have to configure then to do this). So this should not be a problem for them.