Technology and Operations
This forum is for discussing technological & operational matters pertaining to U-boats.
Re: PRE-GHG LISTENING DEVICES
Posted by:
Scott Sorenson
()
Date: December 30, 2019 06:46PM
Geosub1978,
I hope this information helps you. See below.
The Gruppenhorchgerät ('group listening device', abbreviated GHG) was a hydrophone array which was used on Nazi Germany's U-boats in World War II.
The group listening device (‘’Gruppenhorchgerät’’), abbreviated "GHG", consisted of two groups of 24 sensors (one group on each side of the ship). Each sensor had a tube preamplifier. These 48 low frequency signals were then routed to a switching matrix in the main unit. The sonar operator could determine the ship's side and the exact direction of the sound source. To improve the resolution, there were three switchable crossover with 1, 3 and 6 kHz center frequency. A disadvantage of the side mounting, was a dead zone of 40 ° to fore and aft. Range: 20 km to individual drivers, 100 km against Convoy
Search area: 2 × 140 ° Resolution: <1 ° at 6 kHz, 1.5 ° for 3 kHz, 4 ° for 1 kHz; without crossover 8 °
In May 1942 U570 was captured by the British Royal Navy. The submarine’s ELAC equipment was thoroughly analyzed; the above resolution values were determined.
I hope this information helps you. See below.
The Gruppenhorchgerät ('group listening device', abbreviated GHG) was a hydrophone array which was used on Nazi Germany's U-boats in World War II.
The group listening device (‘’Gruppenhorchgerät’’), abbreviated "GHG", consisted of two groups of 24 sensors (one group on each side of the ship). Each sensor had a tube preamplifier. These 48 low frequency signals were then routed to a switching matrix in the main unit. The sonar operator could determine the ship's side and the exact direction of the sound source. To improve the resolution, there were three switchable crossover with 1, 3 and 6 kHz center frequency. A disadvantage of the side mounting, was a dead zone of 40 ° to fore and aft. Range: 20 km to individual drivers, 100 km against Convoy
Search area: 2 × 140 ° Resolution: <1 ° at 6 kHz, 1.5 ° for 3 kHz, 4 ° for 1 kHz; without crossover 8 °
In May 1942 U570 was captured by the British Royal Navy. The submarine’s ELAC equipment was thoroughly analyzed; the above resolution values were determined.
| Subject | Written By | Posted |
|---|---|---|
PRE-GHG LISTENING DEVICES
|
geosub1978 | 10/26/2019 02:49PM |
|
Re: PRE-GHG LISTENING DEVICES
|
Scott Sorenson | 12/30/2019 06:46PM |