Rebecca Mk8 TR 8193 interrogator ( 1956)
For Eureka or Blind Approach beacons
INSTRUMENT LANDING SYSTEMS
A beacon interrogator system was developed in WWII to home-in on small transportable beacons (Eureka) or on a runway centre-line beacon (BABS). The aircraft part is named Rebecca ( I am searching). This site is about the last one of the Rebecca series, the Mk8.
The first technician courses on Rebecca 8 was in June 1956
Philips Sweden made an improved version for the Swedish Airforce, the PN-50
The components of the aircraft part are :
Transmitter - receiver TR8193 (10D/19594);
Range and heading indicator (10AF/530);
Control unit type 8197 (10L/16264);
The aircraft aerial was a yagi or a slotted aerial
The ground beacon (known as Eureka) was mainly the US
RT-44 / PPN1 (1943 ), or RT-37 / PPN2 (1945 ).
This beacon was dropped a few hours before equipment or crew were dropped.
The indicator showed the distance to the beacon on a 20 or 200 nm scale, as well as the course deviation on a single instrument. Previous Rebecca systems had a CRT which required a navigator.
The control panel allows the selection of 8 preset frequencies for transmit and receive ( and their setup in the range 214-230 MHz), and six modes of operation :
BAH Beam Approach Home ( internal preset freq.)
BAT Beam Approach Tuning ( set with TX and RX knobs)
20 20 nautical miles range on meter ( ,, )
200 200 nautical miles range on meter ( ,, )
SB Standby (Heaters only)
OFF Rebecca off
Further toggle switches
· CODE : audible morse code from beacon on/off,
· Strobe : initialize a strobe cycle
· O/R—H Omni range or homing antenna
Range meter and control pictures courtesy GBairspares
I made a testunit for the Rebecca Mk8 system.
T.R. 8193 Transmitter-Receiver Rebecca Mk8