Japanese early radars?

[Rising-Sun]

Well germans did send some tech and some hardware for them to study, took awhile to understand it and adapt to it. By the time they get around it, just wasn't enough time to react when those big bombers reaches Japan. One thing they completely over look is detecting those submarines, if they knew how effective they are, did they ever consider how to deal with it when facing sub threats? What kinda devices did they use back then? All I can think of is listen devices and not sure if the Japanese ever had sonars during the war.

Some of these questions are hard to find when looking for them.

Still looking for more devices or hardware that the Japanese been using, such as listen devices they use on destroyers and smaller vessels. Been trying to find the proper naming for these devices in Hearts of Iron III mod I been working on here. For some reasons, Paradox didn't spend much time doing research while developing that game. Also trying to figure out what their Submarines been using as well. Any clues and help would be nice.

[PaxMondo]

Now sonar, as opposed to radar, they were badly lacking even theoretical research. They didn't have much until they took the repair yards at HK, Singers, and Subic Bay. The issue, as I have read it, is that they did not focus on that much. They were more focused on lgt/med AA, med arty, armor, ... ie IJA had a lot of interest, IJN not so much .... or if they did I simply haven't found references to it ...

[BBfanboy]

ORIGINAL: PaxMondo

Now sonar, as opposed to radar, they were badly lacking even theoretical research. They didn't have much until they took the repair yards at HK, Singers, and Subic Bay. The issue, as I have read it, is that they did not focus on that much. They were more focused on lgt/med AA, med arty, armor, ... ie IJA had a lot of interest, IJN not so much .... or if they did I simply haven't found references to it ...

Same here. Several authorities have said that the IJN disdained ASW (and convoys) because it was defensive and did not meet the "offensive spirit of Bushido" standards.

The Japanese high command probably also thought that the USN did not have enough subs to cover the vast Pacific so they would never be able to find their shipping effectively. They did not know the US could build submarines as fast as they did and crucially, that signal decoding and radar would enable the US subs to find their convoys easily.

And there was likely the economic pressure - building popular mighty ships over building nameless little escorts and doing research to give them good sonars.

[MakeeLearn]

ORIGINAL: RisingSun

Well germans did send some tech and some hardware for them to study, took awhile to understand it and adapt to it. By the time they get around it, just wasn't enough time to react when those big bombers reaches Japan. One thing they completely over look is detecting those submarines, if they knew how effective they are, did they ever consider how to deal with it when facing sub threats? What kinda devices did they use back then? All I can think of is listen devices and not sure if the Japanese ever had sonars during the war.

Some of these questions are hard to find when looking for them.

Still looking for more devices or hardware that the Japanese been using, such as listen devices they use on destroyers and smaller vessels. Been trying to find the proper naming for these devices in Hearts of Iron III mod I been working on here. For some reasons, Paradox didn't spend much time doing research while developing that game. Also trying to figure out what their Submarines been using as well. Any clues and help would be nice.

Japanese Sonar and Asdic https://web.archive.org/web/20141022174 ... 20E-10.pdf

[MakeeLearn]

...

[spence]

Without a group of officers/trained enlisted technicians to plot the information provided by radar or sonar on visual devices much of the information provided by the devices was of little value unless the captain of the ship has an uncanny mental capacity to accurately recreate the spatial relationships in his mind. The visual plots can accurately show such things as the course, speed and exact position of the target which enhance the ability of the defender to vector fighters to intercept or position their depth charges such that a submarine will sail into a pattern.

The Allies developed a system to provide the CO of a ship/TF to visualize his position vis a vis the enemy in any combat situation (AAA,ASW,Surf2Surf). The system was developed in the midst of actual combat systems but the Allies also had an established operational analysis which assured that (eventually) they implemented the best systems. Unfortunately for the Japanese they had no systematic analytical organization which caused them to implement "non-combat" improvements in their operational methods.

[Rising-Sun]

Thank MaKeeLearn, that is interesting find you have there. This will help on my projects though. Any other details you guys may find, both Japanese and Allied would be interesting as well.

[adarbrauner]

MakeeLearn, you are an inexostible, unparalleled source and mine of informations

[BBfanboy]

ORIGINAL: adarbrauner

MakeeLearn, you are an inexostible, unparalleled source and mine of informations

You mean like this:?

[Zorch]

ORIGINAL: BBfanboy

ORIGINAL: adarbrauner

MakeeLearn, you are an inexostible, unparalleled source and mine of informations

You mean like this:?

Magnetic or contact?

[MakeeLearn]

ORIGINAL: adarbrauner

MakeeLearn, you are an inexostible, unparalleled source and mine of informations

LOL. Thanks, I love to research - the thrill of the hunt.

[MakeeLearn]

ORIGINAL: Zorch

ORIGINAL: BBfanboy

ORIGINAL: adarbrauner

MakeeLearn, you are an inexostible, unparalleled source and mine of informations

You mean like this:?

Magnetic or contact?

Dolphins... with lasers.

[adarbrauner]

ORIGINAL: BBfanboy

ORIGINAL: adarbrauner

MakeeLearn, you are an inexostible, unparalleled source and mine of informations

You mean like this:?

EXPLOSIVE!

[geoffreyg]

Military Transformation as a Competitive Systemic Process: The Case of Japan and the United States Between the World Wars
Center for Naval Analyses
www.dtic.mil/get-tr-doc/pdf?AD=ADA417682

Have only recently picked up this thread - the above link posted by MakeeLearn is most interesting.

[Yaab]

Japanese early radars? AARs.