[REL] JayJay's Hydrophone Fix v1.0.rar

[keysersoze]

Originally Posted by finchOU

KDB does work in conjunction with the GHG...but not on the surface. I don't know the specs on the GHG's ability to be used on the surface....tho I would suspect it would be less effective then being deeper....which I dont think is modeled. The KDB is sticking out of the deck (read: above water) while the sub is surfaced (you can see it rotating on forward of the bridge whiled on the surface (should be stowed), while the GHG was a series of microphones build into the side of the boat...under the waterline (on the surface)...hence it's ability to 'hear' while on the surface.

I don't think the regular GHG had the ability to detect contacts while surfaced. Rössler says the GHG could detect single ships at 20 km and convoys at 100 km with "crude" bearing accuracy. However, when he describes the Balkon Gerat (the improved GHG in balcony arrangement), he says this:

At the beginning of 1943, an attempt was made with a Type IXC boat to determine whether receivers set lower down would be more effective and whether listening would be possible in a surfaced boat. Initially, the receivers were simply built into the ballast keel, which was made somewhat wider at this point, but subsequently 2 x 24 receivers were collected into a special gondola (balcony) in front of the keel. This arrangement proved extraordinarily successful, and critical bearings could be obtained from all directions with the exception of an angled segment aft of 150-210 deg. (p. 144).

If my reading is correct, one of the reasons for developing the Balkon Gerat was to allow U-boats to use their hydrophones on the surface. The implication is that the original GHG could not do this.

I have not looked into hydrophones extensively, so if anyone has contradictory information, I would be very interested in it.

[finchOU]

Originally Posted by keysersoze

If my reading is correct, one of the reasons for developing the Balkon Gerat was to allow U-boats to use their hydrophones on the surface. The implication is that the original GHG could not do this.
.

Interesting....Thanks for the info.

[gap]

Just a couple of remarks:

1. There is an obvious reason for the KDB not being able to detect contacts on surface: being placed on deck, its sensors stickyied out of the water surface at that depth; it meant no reception at all. As for GHG and Balkon Gerat, they were basically the same device, and their sensors were mounted on each side of the boat's bow, near or below the keel. Due to their position, they were always submerged. Still, the interference created by waves made GHG's use model ponitless on surface, as its sensor were very sensitive to any source of noise, both internal or external. One of my sources (http://www.cdvandt.org/GHG1996.pdf), reports a minimal depth of 20 m for a good hydrophone reception. On the other hand, the Balkon apparatus introduced several improvements:

• being mounted inside a special hull, below boat's keel, balcony hydrophones were maintained at a 2.5 m lower level and thus were less vulnerable to many sorts of hampering interference;
• Improved electronics and doubled number of sensor, made the new device ore sensitive and lesser subject to interference.

2. At close range, the KDB had a better detection accuracy over the GHG . This was at the cost of an extremely reduced range and to an even more prononced susceptibility to noise sources. For the above reasons, the KDB was never used as a standalone device, but rather coupled with the GHG.
I ignore if the same can be done with SH5 upgrades. If not, KDB sensors settings should be tweaked to simulate the simultaneous use of a GHG, or selecting it as U-boat upgrade would be pointless.

[keysersoze]

Originally Posted by gap

Just a couple of remarks:

1. There is an obvious reason for the KDB not being able to detect contacts on surface: being placed on deck, its sensors stickyied out of the water surface at that depth; it meant no reception at all. As for GHG and Balkon Gerat, they were basically the same device, and their sensors were mounted on each side of the boat's bow, near or below the keel. Due to their position, they were always submerged. Still, the interference created by waves made GHG's use model ponitless on surface, as its sensor were very sensitive to any source of noise, both internal or external. One of my sources (http://www.cdvandt.org/GHG1996.pdf), reports a minimal depth of 20 m for a good hydrophone reception. On the other hand, the Balkon apparatus introduced several improvements:

• being mounted inside a special hull, below boat's keel, balcony hydrophones were maintained at a 2.5 m lower level and thus were less vulnerable to many sorts of hampering interference;
• Improved electronics and doubled number of sensor, made the new device ore sensitive and lesser subject to interference.

2. At close range, the KDB had a better detection accuracy over the GHG . This was at the cost of an extremely reduced range and to an even more prononced susceptibility to noise sources. For the above reasons, the KDB was never used as a standalone device, but rather coupled with the GHG.
I ignore if the same can be done with SH5 upgrades. If not, KDB sensors settings should be tweaked to simulate the simultaneous use of a GHG, or selecting it as U-boat upgrade would be pointless.

Very clear explanations. Thanks gap

[finchOU]

^^^^what he said^^^^