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Fernbesprechgerätesatz (Remote Control Set) Vers.-Nr. 5820-12-139-5253
Also known as FBG 25 SEM .
As usual with the military radios of this era, the SEM series have a
separate remote control set. Such a remote control set has several uses,
for instance it can be used as a field telephone between the local and
the remote control boxes. However, the remote user also can communicate
with other crew members in the vehicle or use the radio sets that are part
of the vehicle's commo gear.
The SEM 25 remote control set consists of a local- and a remote control
box, with extras like a carrying bag, extra handset, a webbing harness
to mount the local control box on top of the SEM 25 transceiver.
In principle the local and the remote control box can be connected by
a length of field wire, simple two pair wire will do the trick. However,
schematics in the manuals show that set-up is not quite as simple in the
case of for instance a tank, where the moving turret would contain most
of the commo set-up - the connection would have to pass through the slip ring (schleifring)
in order to get to the body of the vehicle.
The local control box is located within the turret, connecting to the
On-board Communications Amplifier with two fixed cables that end in standard
audio connectors. It also has two binding posts, to connect it to the slip ring
(schleifring).
Once in the body of the vehicle, the signal goes to the Outboard Control
Box, that in it's turn is connected to the Outboard Communications Unit
- that is situated outside the armour. Here there are again to binding
posts that will the actual field wire going out to the remote control box...
Manuals
TDv 5820/047-13 Fahrzeugfunksprechgerät 26-70MHz Fernbesprechgerätsatz SEM-25.
If you have the next one: tell me!
TDv 5820/047-40 Fahrzeugfunksprechgerät 26-70MHz Fernbesprechgerätsatz SEM-25.
A short description can be found in TDv 5820/045-13, page 10, 11, complete with photograph.
Ortbesprechgerät (Local Control
Box) Vers.-Nr. 5820-12-141-1258
External controls and connectors
Switch: SE I / TEL / SE II, spring loaded switch with normal
position TEL, in order to access the transceivers I and II from the handset
connected to the local control box.
Switch: TEL / BV / FUNK, switches mode for remote control box between
telephone (remote to local control box only), BV (intercom) and Funk (remote
control box is connected directly to the transceivers)
Switch: RUFEN, spring loaded switch to call Remote Control Box
Volume Control: governs volume in both local and Remote Control Box
Connector: 45, standard audio connector primarily for handset for telephone
communication to remote control box
Connector 13: two line binding posts via slip ring (schleifring) to Outboard Control
Box
Fixed Cable 71: audio-connector to intercom amplifier or directly to
audio-connector on front of SEM 25
Fixed Cable 72: audio-connector to intercom amplifier or directly to
audio-connector on front of SEM 25
Technical data
The maximum length of field wire to the Remote Control Box
is
3 kilometers.
Internally mounted batteries: 4 each BA-30 L, VG 95233, Vers.-Nr. 6135-12-135-3399
for 6 Volts.
In case of temperatures under 0ºC, use rechargeable NiCads GSZ
3,3, VG 95230, Vers.-Nr. 6140-12-140-6493.
Dimensions
Height: 93 mm; Width: 217 mm; Depth: 184 mm; Weight: 3,71 Kg
Manuals
Construction
Fernbesprechgerät (Remote Control
Box) Vers.-Nr. 5820-12-141-1257
External controls and connectors
Pressure equalising screw
Technical data
The maximum length of field wire to the Remote Control Box
is 3 kilometres.
Internally mounted batteries: 4 each BA-30 L, VG 95233, Vers.-Nr. 6135-12-135-3399
for 6 Volts.
In case of temperatures under 0ºC, use rechargeable NiCads GSZ
3,3, VG 95230, Vers.-Nr. 6140-12-140-6493.
Dimensions
Height: 93 mm; Width: 217 mm; Depth: 131 mm; Weight: 2,64 Kg
Segeltuchtasche (Carrying
Bag) Vers.-Nr. 5820-12-141-1259
This cotton duck carrying bag has two main compartments, for
the two Control Boxes. The smaller Remote Control Box fits in the back
and is protected by an extra flap. The handset is stowed on top of this
flap. There is also an extra pocket, closed with a stud, in the front lid
that holds the harness for attaching the Local Control Box on top of the
SEM 25.
The bag has a fixed carrying strap that can be adjusted in length.
In order to close it first the front flap is folded in, then both side
flaps can be closed by knotting the two laces attached to them and finally
the main flap on the back is fastened with an aluminium buckle.
Haltevorrichtung (Harness) Vers.-Nr. 5820-12-141-1294
Webbing, straps the Local Control Box on top of the SEM 25.
Handapparat (Handset) Vers.-Nr.
5965-00-163-9947
Basically the standard H-33F/PT, with a 1.5 mtr cables ending
in a straight U-77/GR connector. Manufactured by SEL.
Associated parts:
These parts do not officially belong to the Fernbesprechgerätesatz
(Remote
Control Set) - they are not mentioned as such in the manuals I have
seen. However, they always show up with this set. Even in depot-packed
sets these will be found.
Tragevorrichtung für
Feldkabel-Trommel (Carrying Bracket for Field Wire Reel) Vers.Nr. 12-133-4887
An metal bracket, olive drab, to hold a metal reel of field
wire in order to connect the remote control to the external connections
of the vehicle. Works together with the handle mentioned in the next paragraph,
which is used to reel up laid out field wire again.
The bracket has a round hole on one side, 12 millimetres across, with
a lockable similar hole on the other side.
Kurbel für Feldkabel-Trommel
(Handle
for Field Wire Reel) Vers.Nr. 12-124-1427
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