Hallo gents,
does anyone know anything about this type of Fieldphones? All comments would be appreciated.
does anyone know anything about this type of Fieldphones? All comments would be appreciated.
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Close up of schematic on the inside cover:
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It's not a phone, it's a cable searcher. You use it to trace burried cables for example.
Connect the sender to one end of the cable and use the other device to listen for the signal.Comment
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I like it !!
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I`m sorry I don`t get it: how do you listen for the signal? Is there any reference on internet for that?Originally posted by Asbjørn View Post
Thank you fieldgear but it`s not mine ... yet.Comment
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The description makes sense. The transmitter is attached to one end of a cable, the "receiver" to the other. This would be useful to trace two cable ends in a large bundle. But my question is why don't they just use two FF33s and test with the Kurbelinduktor?
Still, very rare device - I've never seen one before. Nice find!
YuriComment
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As I understand it, you connect a "such spule" = search coil, between the connection a + b. La is connected to one end of cable, to search for, Lb to the earth using pole. You are then able to find out where your cable are, for example covered with earth, in trenches.
Nice piece of equipment.
HenrikComment
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hcs is right, you use it with a search coil, almost like a metal detector. You don't connect anything to the other end of the cable, because you don't know where it is.Comment
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So what do you use as a detecting element?
YuriComment
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I remember about 5 years back I saw a discussion on some forum about a fairly small circular search coil that nobody could identify. I would not be surprised if that was the one used with this equipment.
The only thing I don't like are the Wa.A stamps on the schematics, seem to me like typical trader embelishments....
regards,
FunksammlerComment
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Thank you everyone for all your replies! Just to clarify: are you using "receiver" unit (the one with 2xRV2P800 valves?) to detect buried cable?... How do you know when you detect it ?...
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Funksammler, are you saying that a Wa.A stamp on schematic is a no-no?
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The transmitter contains a "vibrator" which generates an AC signal which is coupled into the cable. I can't tell from the scematics at what frequency it runs, but my guess is that it runs at a low audible frequency like 200-500 Hz.
The receiver contains a 2-stage amplifier with a filter. This filter filters out the 50 Hz mains frequency but lets through the audible frequency which can be heard through the headphones if the search coil is placed over the cable.
On the Wa.A stamp, I revise my opinion, Wa.A 577 is associated with the Siemens & Halske factory in Berlin, although it normally appears like this:
<a href="http://s672.photobucket.com/albums/vv86/Funksammler/?action=view&current=WaA577.jpg" target="_blank"><img src="http://i672.photobucket.com/albums/vv86/Funksammler/WaA577.jpg" border="0" alt="Photobucket"></a>
The Siemens & Halske logo's are prominent on the schematics so the Wa.A number is consistent with the equipment. The particular Waffenambt inspector must have been in a hurry to stamp all over the schematic though....
regards,
FunksammlerComment
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Interesting description and makes sense. The type of stamp you've just shown usually is seen on devices that are 1939 or earlier.
I wonder what the signal strength is of the Sender here. And to what distance can one hear the signal away from the transmitter?Comment
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