8.33 kHz spaced frequencies not saved when saving flight

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Brief description of the issue:
When saving a flight if any of the radios are tuned to an 8.33 kHz spaced frequency it is not saved correctly. For example if the radio is tuned to 121.805 when the flight is saved it will be saved as 121.800 when the flight is reloaded.

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Detailed steps to reproduce the issue encountered:

  1. Tune radio to an 8.33 kHz spaced frequency (e.g. 121.805), 2. save flight, 3. reload saved flight and check radio frequency.
    PC specs and/or peripheral set up if relevant:

Build Version # when you first started experiencing this issue:


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Do you have the same issue if you follow the OP’s steps to reproduce it?

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Which plane are you finding this is not working in ??

Why should it be saved, unless the plane, or that radio has State saving ?

It happens with all aircraft, when you save a flight the radio frequencies (along with all other switch positions etc) are saved in the ****.flt file, you can open the ****.flt files with a text editor to see this.

25kHz spaced frequencies seem to be saved and restored correctly but 8.33kHz spaced frequencies are not.

My experience is that other numbers such as altitude, speed, RPM, etc. Are also rounded to a number that is near what was saved but not the actual.

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Possibly, but I think this is more likely to be related to left over code from FSX being used. FSX only had 25kHz spacing so frequencies would be 118.000, 118.025, 118.050, 118.075… and so on. With 8.33kHz spacing there are additional frequencies 8.33kHz above and below each of those steps and it is these that are not being saved correctly.

The INC & DEC of 8.33khz spaced frequencies is not reliable (to put it nicely)-- rather than just adding/subtracting 9.33333kHz (and roundingoff) it should set the frequency to EXACTLTY the correct 8.33 spacing Frequencies.

I believe the pms50 GTN750, check the 8.33kHz frequencies, and programmatically does not allow an Incorrect (inaccurate) 8.33 Khz to exist, without correcting it

I’ve not noticed any issues with the INC / DEC function, that seems to work as I would expect it to. The steps I get are:-

000
005
010
015
025
030
035
040
050

and so on…

When the frequencies in bold are selected the radio would be operating in 25kHz bandwidth mode and when any other frequencies are selected it would be in 8.33kHz mode.

The problem arises if something else set the Freq by a SET to an invalid 8.33Khz Freq, and then the after DP part cannot INC/DEC.

You use to be able to do this with the GTN750, until pms50 fixed it GPS’s Touch keyboard input, so it would only accept valid frequencies,

You can still set an invalid freq with Hi’s Stream Deck “Flight Tracker”, which allows you to test this issue.

Ah OK, I don’t really use the GPS much so wasn’t aware of that, I’m more of an airliner man :slight_smile: I have a self built hardware radio panel and that always works as expected for me.

Does your hardware radio panel INC & DEC, or do you enter the Freq Directly ?

Its when you inputs an Invalid Freq Manually, that sometimes, some systems can then mess up.

If all you do is INC & DEC, “most” systems seems to do that correctly.

The panel is connected via Mobiflight and uses the relevant INC and DEC events so it’s not possible to enter an invalid frequency (which of course would be the case with a real world radio!). The “bug” I am reporting is that even when a valid frequency is set on the radio it is not saved correctly in the FLT file when you save a flight.

It’s not particularly a big issue for me, just a minor irritation and there are many other things that really DO need fixing and are far more important (the c***py ATC springs to mind!). I just thought as I had noticed it I would report it and let Asobo / MS decide if they want to fix it or not (I won’t hold my breath :slight_smile: )

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