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Buddahaid · 12-09-09, 02:06 PM

That is a huge surface contact at about 25,000 yards. I can't tell you the bearing as that A-scope is directional. You would need to see what bearing the PPI scope is sweeping past.

Buddahaid

EDIT:
Here's the links to SH4 and radar type/use.

The SD air search radar is an AI function only and that is where your crew announcement came from. The SJ surface search set is both of the scopes you can man, and only becomes functional as the war progresses, and your sub actually has it installed. Yes, that is a bit confusing and to top it off, the buttons are/were mislabeled. The SJ A-scope is the green one with the horizontal grass line. It's used for range finding and has to be directed at the target to see the pips. The PPI (plan position indicator) is the red one with the sweeping clock like hand. This is a newer scope added to the sets and gives you a map, or plan view, showing bearing and range.

So, when the crewman says he has a radar contact, it's likely an aircraft. Look on your map view for a very fast contact and dive to evade.

This one describes the types in general with specs.
http://www.history.navy.mil/library/online/radar-1.htm

This one shows more theory and indicates the SJ A-scope was for accurate range finding.
http://www.smecc.org/mcmahon's_radars!.htm

http://www.usscobia.com/

The Cobia link has photo's of the actual set, but I don't see any graticules other than bearing ones on the PPI.

Buddahaid

12-09-09, 02:06 PM	#5
Buddahaid Shark above Space Chicken Join Date: Jun 2008 Posts: 9,325 Downloads: 162 Uploads: 0	That is a huge surface contact at about 25,000 yards. I can't tell you the bearing as that A-scope is directional. You would need to see what bearing the PPI scope is sweeping past. Buddahaid EDIT: Here's the links to SH4 and radar type/use. The SD air search radar is an AI function only and that is where your crew announcement came from. The SJ surface search set is both of the scopes you can man, and only becomes functional as the war progresses, and your sub actually has it installed. Yes, that is a bit confusing and to top it off, the buttons are/were mislabeled. The SJ A-scope is the green one with the horizontal grass line. It's used for range finding and has to be directed at the target to see the pips. The PPI (plan position indicator) is the red one with the sweeping clock like hand. This is a newer scope added to the sets and gives you a map, or plan view, showing bearing and range. So, when the crewman says he has a radar contact, it's likely an aircraft. Look on your map view for a very fast contact and dive to evade. This one describes the types in general with specs. http://www.history.navy.mil/library/online/radar-1.htm This one shows more theory and indicates the SJ A-scope was for accurate range finding. http://www.smecc.org/mcmahon's_radars!.htm http://www.usscobia.com/ The Cobia link has photo's of the actual set, but I don't see any graticules other than bearing ones on the PPI. Buddahaid