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Lets talk lichtsprecher....
Old 02-12-2010, 05:20 PM   #1
fieldgear
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Default Lets talk lichtsprecher....

Hi All

I am still on the hunt for a LiSpr80 set if anyone PLEASE has one for sale.

A friend has very kindly offered to help with getting my existing set operational (& he has already done an outstanding job on my Feld. Fu b which burst into life again yesterday after nearly 70 years!) (Thanks Tony!) but I have some questions.

1. The early control boxes appear to be 4.8v output to the lamp in the head. My lamp seems frozen into the holder when removed from the mount so I cannot see any voltage. How do you tell which is which? 1.5v accross the lamp produces a dim glow. A brief 3v is quite bright, so I assume my lamp is 2.4v.

2. The head I have, has a yellow ring on the back of it. This is observed in numerous images but what is its significance?

3. Are heads interchangeable with early & late control boxes, other than for the lamp voltage?

A few of you out there have operational pairs. I am very keen to get a second unit so I may join the ranks.

Care to share any other info that may be of use?

Thanks,.>Rob
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lisprechgeraet 80
Old 02-12-2010, 05:40 PM   #2
Tornfuté
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Default lisprechgeraet 80

hello rob
i have a nearly complete set with battery case hing under the
transceiver , i have all cables , tripod , binocular case , mike , morse cable with push button , spares hold in the upper left case . near amplifier .
in 4,8 volts older one , i believe the battery is there ( left )
in 2,4 v batteries are in other hinged box .
i am nearly shure when you have a yellow circle it's for 2,4 volts .
, in the case there are spares bulbs , i will have a look and report if i see voltage.
i have a picture from a zeiss book and it show an older version of
lisprecher i never see ( always in 80 mm ) as i know other exists .
apart this complete set , i have 2 other binocular and case , and a
battery box , i will find one day an amplifier .
i will change with a friend my third unit 2,4 volts for the older one
the tripod attachement is completely different , i have owned a similar
unit in the past , but change it , but before swap i make a picture of both binoculars and it's interesting , i must find this picture , scan it and post it .
pierre
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Old 02-12-2010, 05:54 PM   #3
fieldgear
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Hi Pierre

Sent you a PM

Best,.>Rob
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pictures
Old 02-12-2010, 05:55 PM   #4
Tornfuté
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Default pictures

hi all i was lucky to find it quick
pierre
http://i898.photobucket.com/albums/a...0oldandnew.jpg
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Old 02-13-2010, 08:33 AM   #5
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Indeed there are two different versions for 2.4 and 4.8 Volt. The one on the left, a 1940 example is a 2.4 Volt version, there are two separate power plugs with cables leading to the battery compartment below. The one on the right is a 1937 4.8 Volt version, and the Anode battery cable is exiting from the front panel on the left, without a plug:

Photobucket

The one of the right is fitted to a later casing, the earlier casing had a slightly different layout:

Photobucket

For comparison a picture of the 4.8 V lamp:
Photobucket

And the 2.4 V lamps:
Photobucket

The lamps can be distinguished by the yellow dot found on the 2.4 V type. This ties in with the yellow markings on the casing.

regards,

Funksammler
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Old 02-13-2010, 08:36 AM   #6
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Sorry, attached the wrong picture of the 4.8V version:

Photobucket

regards,

Funksammler
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Old 02-13-2010, 10:29 AM   #7
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It may be interesting to know that russians have also similar thing to Li Spr and modulation was also done by moving prism.

http://www.rkk-museum.ru/collections...0-11-1_Tel.pdf

Pdf page 24 and 25.
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Old 02-13-2010, 11:15 AM   #8
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Funny, how the Russian stuff resembles its German counterparts.

Yuri
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Old 02-13-2010, 11:54 AM   #9
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to funksammler
i believe that your right 1937 lisprech 80 case is'nt the
right one , as it will be difficult to put the anode battery
vertically , it must be from an 2,4 v version , amplifier is only fixed by two screws on the back .
thanks for the scan you send me
pierre
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Old 02-14-2010, 12:34 AM   #10
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@Funksammler (or whoever knows) - where can I find info as to the various currents drawn from the 60V/50V/2.4V/2V/-1.5V battery lines on the LiSpr. 80, to enable me to design a suitable power supply?

Any info much appreciated!

Tony

Last edited by Tony_Grimwood; 02-14-2010 at 12:44 AM. Reason: typo
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Old 02-14-2010, 02:14 AM   #11
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Hi All

Yuri, Pierre, can you help with the info on current draw? Tony has been the driveing force behing getting my Feld. Fu. b back to life & we are keen to see if the LiSpr80 half I have can be got going.

The mission then continues 2 find a second set........

Best,.>Rob
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Old 02-14-2010, 02:34 AM   #12
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Quote:
Originally Posted by fieldgear View Post
Hi All

Yuri, Pierre, can you help with the info on current draw? Tony has been the driveing force behing getting my Feld. Fu. b back to life & we are keen to see if the LiSpr80 half I have can be got going.

The mission then continues 2 find a second set........

Best,.>Rob
Rob - I can make an educated guess as to the currents if we can't find the original specs so it's not a problem. Over-engineer everything and we're in business

I'm amazed (but not entirely surprised) that Zeiss' engineers figured out how to modulate visible and infrared light way back then ... How long until someone starts modulating gamma rays or even more subtle radiations that don't rely on line-of-sight eh?

Tony (who now has ample stuff to think himself to sleep with later )
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Old 02-16-2010, 04:57 AM   #13
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hello
i believe it's not difficult to realize a power supply , the germans use
different power sources for their set , a 4.8 NC5 for supplying voltage to
light bulb if we consider a 4.8 volts 4 watts , it means less then 1 A for
powering the bulb ( in the binocular ) they also use a 2 B19 2 volts 19
AH for amplifier heaters and microphone bias , a single valve
RV2P800 need around 180-200 mA for heaters ,anode current 3.5 mA
grid bias is very low around 1 mA ( multiply all by 5 valves )
the third source is a dry battery who supply anode voltage of 60 v
for RV2P800 and to receiving cell
what will be more difficult is to realize the different connectors , to power the different unit .
in binocular , you must also replace the cell by a modern one , and be lucky
with prism modulator.
there was an article in electronic-engineering, an other in electronics §
wireless world august 1985.
pierre
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early model
Old 02-16-2010, 05:43 AM   #14
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Default early model

hi i put here 2 scans from early version of lichtsprech 80 i never see
it's probally an experimental or labor version , before they produce
the WH model

http://i898.photobucket.com/albums/a...geraet801a.jpg
pierre
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second page of early model
Old 02-16-2010, 05:46 AM   #15
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Default second page of early model

hi look to
http://i898.photobucket.com/albums/a...geraet802a.jpg
pierre
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