Photoelectric Communication?

Discussions on the equipment used by the Axis forces, apart from the things covered in the other sections. Hosted by Juha Tompuri
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Urmel
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Photoelectric Communication?

#1

Post by Urmel » 07 Jan 2017, 19:36

Hi

I have come across a reference to this in an Italian document. Does anyone know how that worked?

Many thanks in advance!
The enemy had superiority in numbers, his tanks were more heavily armoured, they had larger calibre guns with nearly twice the effective range of ours, and their telescopes were superior. 5 RTR 19/11/41

The CRUSADER Project - The Winter Battle 1941/42

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Urmel
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Re: Photoelectric Communication?

#2

Post by Urmel » 07 Jan 2017, 21:50

The enemy had superiority in numbers, his tanks were more heavily armoured, they had larger calibre guns with nearly twice the effective range of ours, and their telescopes were superior. 5 RTR 19/11/41

The CRUSADER Project - The Winter Battle 1941/42


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Juha Tompuri
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Re: Photoelectric Communication?

#3

Post by Juha Tompuri » 07 Jan 2017, 22:13

Yep, a Lichtsprechgerät.

a 2-way audio communication equipment.
The signal is transferred on a light beam from a 5-watt bulb.
The light beam is modulated with a light phase modulator.
The light beam is AM-modulated with a moving prism.
The position of this prism is manipulated of the transmitter audio amplifier.
Red or IR filter can be inserted in the beam.
Receiver and transmitter have one lens each.
Light detector is placed 250 mm behind the receiver lens.
Diameter on the light detector is less than 1 mm,
so the direction of the unit is very important.
Diameter of the light beam is only 1.4 meter at 250 meter from the transmitter lens.
This will give a diameter of 7 meter 1 km away.
http://www.la6nca.net/tysk2/lispr/
More detailed info: http://www.la6nca.net/tysk2/lispr/lispr.pdf
Attachments
Lichtsprechgerat.jpg
Photo from Riihimäki Signals Corps Museum Finland 2006
Last edited by Juha Tompuri on 07 Jan 2017, 22:15, edited 1 time in total.

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Urmel
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Re: Photoelectric Communication?

#4

Post by Urmel » 07 Jan 2017, 22:48

Thank you Juha, much appreciated!
The enemy had superiority in numbers, his tanks were more heavily armoured, they had larger calibre guns with nearly twice the effective range of ours, and their telescopes were superior. 5 RTR 19/11/41

The CRUSADER Project - The Winter Battle 1941/42

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Juha Tompuri
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Re: Photoelectric Communication?

#5

Post by Juha Tompuri » 07 Jan 2017, 23:34

Thanks,

"Information not shared, is lost", as the Forum motto goes.
Attachments
Lichtsprechgerat.2.png
http://www.la6nca.net/tysk2/lispr/lispr.pdf
Lichtsprechgerat.2.png (85 KiB) Viewed 1518 times

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Urmel
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Re: Photoelectric Communication?

#6

Post by Urmel » 08 Jan 2017, 18:20

Thanks again Juha!
The enemy had superiority in numbers, his tanks were more heavily armoured, they had larger calibre guns with nearly twice the effective range of ours, and their telescopes were superior. 5 RTR 19/11/41

The CRUSADER Project - The Winter Battle 1941/42

fv1620
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Re: Photoelectric Communication?

#7

Post by fv1620 » 27 Apr 2017, 10:35

I have put a little bit about LiSpr250/130 & a Japanese photophone on pages 2-4 of part 3 of this series that covers other IR systems generally.

http://hmvf.co.uk/forumvb/showthread.ph ... ision)-1-4

Avalancheon
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Re: Photoelectric Communication?

#8

Post by Avalancheon » 01 May 2017, 14:37

I'm surprised they were able to develop something like this, it seems fairly high tech!

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