correct as is Ground radar azimuth bug?

[CoconutCockpit]

I don't think this is intended behavior, but I could be wrong
 

Steps to reproduce:

• Switch to A-G master mode
• Set FCR to GM
• Set FCR to NORM mode
• With azimuth set to 60, observe time it takes to scan: roughly 2.5 seconds
• With azimuth set to 30, observe time it takes to scan: roughly 1.5 seconds
• With azimuth set to 10, observe time it takes to scan: roughly 0.5 seconds

This seems normal, there's a smaller area to scan so it takes less time

• Switch to EXP, DBS1 or DBS2 mode
• With azimuth set to 60, observe time it takes to scan: roughly 5 seconds
• With azimuth set to 30, observe time it takes to scan: roughly 5 seconds
• With azimuth set to 10, observe time it takes to scan: roughly 5 seconds

Observed result:

When changing the scan area, the time it takes to scan stays the same. 

Expected result:

The same as NORM mode. The scanned area is smaller between azimuth set to 60, 30 and 10, so it would make sense that

• 30 updates quicker than 60 
• 10 updates quicker than 30

 

ground_radar_bug.trk

[BIGNEWY]

Hi, 

I have spoken to the team, this is correct as is, if you have any public information it should be different feel free to message me.

thanks

[CoconutCockpit]

Alright, thanks for checking.

I don't have any info myself, but I remember that initially it did make a difference as you can see in @Wags' original video at 7:30

 

It would be nice if someone with know-how (@Frederf?) could explain how this works then. It doesn't make much sense that the radar needs an equal amount of time to scan 60 degrees as it would 10 degrees.

• What exactly does the radar antenna do when you enter one of the expanded modes? 
• Does the radar actually still scan 60, 30 or 10 degrees in the expanded modes? The blue T cursor on the bottom of the MFD still shows the antenna moving side to side, an equal amount to the selected azimuth, should that be the case?
• Am I right to think there is no point in adjusting the azimuth at all when using one of the expanded modes then? 

Edited January 13, 2022 by applepiefrost