USS Pampanito - BK (ABK) TRANSPONDOR

BK (ABK) TRANSPONDOR

ABK-1 with shock mount aboard Pampanito.

Description.-The ABK transpondor (known as BK in ship installations) is a combination receiver and transmitter which accepts challenging signals from an interrogator and automatically answers this challenge in coded form for identification purposes. It is used to reply to challenges from Mark III IFF interrogators.

Power supply.-ABK-1-21 to 30 volts d.c. 5 amp.

Transmitter specifications:
Frequency (Mc) (sweep)  158 to 186.
R-f source              7193 tube.
R-f lines               RG-12/U.
Pulser type             hard tube.
R-f peak power          4 watts.
Pulse rates             up to 2000.
Pulse lengths (micro second) 7, 21, 80.

Receiver specifications:
Type                    Superregenerative.
Sensitivity             84 to 70 db.

Antenna specifications.-"Steering wheel" or "life preserver" type.

Tube complement.-2 type 6H6, 6 type 6SH7, 2 type 7193 or 1 type 7193 and 1 type 2622.

         Dimensions and weights
   Unit   Navy Type No. Height Width  Depth      Weight
                        Inches Inches Inches     Pounds
ABK            43AAX   12 5/16   9     12 31/32    30
ABK-1          43AAY
Control unit   23ABG    3 1/2    8      6 1/4       1.0
Selector unit  23ABH    3 1/2    8      6 1/4        .5

Literature.-Instruction Book-CSP 1375.

REFERENCES:

The information enclosed here is excerpted from:
Catalogue of Naval Electronic Equipment-April 1946- NavShips 900,116.