Radar sweep "hiccups" near 0 bearing

flapjack · 05-03-10, 09:20 PM

This is version 1.5, stock.

I'm experiencing some "hiccups" with the PPI radar around zero bearing. For example, if the line is moving clockwise, when it hits zero bearing, it jumps to about bearing 003, stops there for a moment, then continues (at the position and speed it would have had it not jumped). Same thing happens in mirror-image when the line is moving the opposite direction, i.e. jumps from zero bearing to about bearing 357.

I distinctly remember not having this problem before upgrading to 1.5.
Does anyone know how to remedy this?

Thanks in advance.

-- fj

magic452 · 05-04-10, 12:22 AM

Me thinks you better keep the radar operator away form the medicinal alcohol.

Haven't ever noticed this as I don't use the radar manually much. so I don't have a solution.

Magic

G2B · 05-04-10, 12:58 AM

From the "Peanut Gallery" Is your periscope up?

LukeFF · 05-04-10, 03:22 AM

It's something that was introduced with 1.5. No known fix for the issue at this time.

tomoose · 05-04-10, 09:42 AM

I was going to ask the same question. Hadn't noticed the stutter around the 360/0 mark before. Notice it everytime now, LOL.
Glad to hear it's a game problem and not a mod problem. A little distracting but not a showstopper.

Keelbuster · 05-04-10, 10:20 AM

I find it annoying too - especially when you're trying to take a bearing/range for a target around that point. You basically have to guess on the bearing.

Another semi-related radar Q:

When you are in focus mode on the PPI, and you fix on a target to get range, I find that the range on the A-scope reaches maximum when the radar sweep arm is slightly off center of the target. In fact, often if you place the radar arm dead-center on the contact blip, the A-scope does not have a reading. Anybody know about this? If I maximize the height of the contact on the A-scope (e.g., position the radar sweep arm slightly off-center such that it maximizes the A-scope return), then am I getting the real bearing, or is it off by a few degrees because of an interface bug?

G2B · 05-04-10, 03:26 PM

You could keep in mind radar was still somewhat new and bound to have a few glitches and work around it, maybe adjust the boats course a couple degrees port or starboard.

Admiral8Q · 05-04-10, 03:49 PM

Quote:

Originally Posted by G2B

You could keep in mind radar was still somewhat new and bound to have a few glitches and work around it, maybe adjust the boats course a couple degrees port or starboard.

I would think it was more useful at the time as an early warning system rather then a mean to attack on an exact bearing and range until after the war when they perfected it.

Nisgeis · 05-04-10, 04:23 PM

Quote:

Originally Posted by G2B

You could keep in mind radar was still somewhat new and bound to have a few glitches and work around it, maybe adjust the boats course a couple degrees port or starboard.

The real world radar worked perfectly, in that the contact would be the strongest at the bearing the radar was actually poiting. It's the SH4 radar that is all screwed up. Adjusting the boats course won't do anything to help, as the radar gives a relative bearing, unfortunately.

Quote:

Originally Posted by Admiral8Q

I would think it was more useful at the time as an early warning system rather then a mean to attack on an exact bearing and range until after the war when they perfected it.

It was extremely accurate for range, within 25 yards give or take 0.1% of the range. The bearing could be measured with lobe switching to within a quarter of a degree (according to the manual), but it took time to do this, so sight was the preferred method for bearings and radar for range.

Admiral8Q · 05-04-10, 04:27 PM

I guess the radar in SH1 was way more 'historical' I used that thing to death.

flapjack · 05-04-10, 08:44 PM

Too bad there isn't a solution to the radar sweep hiccuping. In some ways, I'm glad it's not just me. Otherwise, it might have been me who needed to lay off the sauce in the medicine cabinet.

Curious thing, is that it *was* working properly in 1.4! If the 361 degree circle is the problem, then perhaps it can be changed to a 360 degree circle? I saw some settings in, I think it was Sensors_sub_US, a "bearing" node under certain sensors marked "radar". Nisgeis, I believe I've seen you post a lot regarding the SH4 radar (and mods), maybe you know if this is possible?

Also ... some people mentioned inconsistencies between what is clicked on and what you actually get, e.g. with regard to depth. I notice some inconsistency with headings that are given in the message box versus those that are spoken. So, if I select some heading on the compass, the message box might say, "Set course 113" but crew voice will say, "Set course 116". It's almost always different, and off by two or three degrees.

Admiral8Q · 05-05-10, 07:05 AM

Quote:

Originally Posted by flapjack

Curious thing, is that it *was* working properly in 1.4!

Wait...
It was working in 1.4? Someone should check that out if they know what files controlled radar and maybe find that we could replace the 1.5 ones with that...

LukeFF · 05-05-10, 04:59 AM

Quote:

Originally Posted by Nisgeis

It was extremely accurate for range, within 25 yards give or take 0.1% of the range. The bearing could be measured with lobe switching to within a quarter of a degree (according to the manual), but it took time to do this, so sight was the preferred method for bearings and radar for range.

Hence the usefulness of the TBT and its ability to transmit bearing information to the TDC.

05-03-10, 09:20 PM	#1
flapjack Swabbie Join Date: Apr 2010 Posts: 9 Downloads: 41 Uploads: 0	Radar sweep "hiccups" near 0 bearing This is version 1.5, stock. I'm experiencing some "hiccups" with the PPI radar around zero bearing. For example, if the line is moving clockwise, when it hits zero bearing, it jumps to about bearing 003, stops there for a moment, then continues (at the position and speed it would have had it not jumped). Same thing happens in mirror-image when the line is moving the opposite direction, i.e. jumps from zero bearing to about bearing 357. I distinctly remember not having this problem before upgrading to 1.5. Does anyone know how to remedy this? Thanks in advance. -- fj

05-04-10, 12:22 AM	#2
magic452 Sea Lord Join Date: Sep 2007 Location: Reno Nevada USA Posts: 1,860 Downloads: 85 Uploads: 0	Me thinks you better keep the radar operator away form the medicinal alcohol. Haven't ever noticed this as I don't use the radar manually much. so I don't have a solution. Magic __________________ Reported lost 11 Feb. 1942 Signature by depthtok33l

05-04-10, 12:58 AM	#3
G2B XO Join Date: May 2009 Location: Guam, I think Posts: 420 Downloads: 80 Uploads: 0	From the "Peanut Gallery" Is your periscope up? __________________

05-04-10, 03:22 AM	#4
LukeFF Silent Hunter Join Date: Apr 2005 Location: Riverside, California Posts: 3,610 Downloads: 41 Uploads: 5	It's something that was introduced with 1.5. No known fix for the issue at this time. __________________ ROW Sound Effects Contributor RFB Team Leader

05-04-10, 09:42 AM	#5
tomoose Grey Wolf Join Date: Aug 2005 Posts: 930 Downloads: 23 Uploads: 0	You beat me to it I was going to ask the same question. Hadn't noticed the stutter around the 360/0 mark before. Notice it everytime now, LOL. Glad to hear it's a game problem and not a mod problem. A little distracting but not a showstopper.

05-04-10, 10:20 AM	#6
Keelbuster Ace of the Deep Join Date: Oct 2005 Location: BA 72 Posts: 1,092 Downloads: 43 Uploads: 0	I find it annoying too - especially when you're trying to take a bearing/range for a target around that point. You basically have to guess on the bearing. Another semi-related radar Q: When you are in focus mode on the PPI, and you fix on a target to get range, I find that the range on the A-scope reaches maximum when the radar sweep arm is slightly off center of the target. In fact, often if you place the radar arm dead-center on the contact blip, the A-scope does not have a reading. Anybody know about this? If I maximize the height of the contact on the A-scope (e.g., position the radar sweep arm slightly off-center such that it maximizes the A-scope return), then am I getting the real bearing, or is it off by a few degrees because of an interface bug? __________________

05-04-10, 03:26 PM	#7
G2B XO Join Date: May 2009 Location: Guam, I think Posts: 420 Downloads: 80 Uploads: 0	You could keep in mind radar was still somewhat new and bound to have a few glitches and work around it, maybe adjust the boats course a couple degrees port or starboard. __________________

05-04-10, 04:27 PM	#10
Admiral8Q Ace of the Deep Join Date: Jul 2002 Location: Prince Edward Island, Canada Posts: 1,077 Downloads: 24 Uploads: 0	I guess the radar in SH1 was way more 'historical' I used that thing to death. __________________

05-04-10, 08:44 PM	#11
flapjack Swabbie Join Date: Apr 2010 Posts: 9 Downloads: 41 Uploads: 0	hiccuping radar ... Too bad there isn't a solution to the radar sweep hiccuping. In some ways, I'm glad it's not just me. Otherwise, it might have been me who needed to lay off the sauce in the medicine cabinet. Curious thing, is that it was working properly in 1.4! If the 361 degree circle is the problem, then perhaps it can be changed to a 360 degree circle? I saw some settings in, I think it was Sensors_sub_US, a "bearing" node under certain sensors marked "radar". Nisgeis, I believe I've seen you post a lot regarding the SH4 radar (and mods), maybe you know if this is possible? Also ... some people mentioned inconsistencies between what is clicked on and what you actually get, e.g. with regard to depth. I notice some inconsistency with headings that are given in the message box versus those that are spoken. So, if I select some heading on the compass, the message box might say, "Set course 113" but crew voice will say, "Set course 116". It's almost always different, and off by two or three degrees.