BN, BN-1, CXEN Mark III IFF INTERROGATOR-RESPONSOR
Description.-BN series are small Mark III IFF interrogator-responsors
for use with shipborne radars equipped to receive IFF video pulses. They
can he installed where space is at a premium They interrogate transpondors
AN/APX-1, AN/APX-2, SCR-595 (ABK series) and SCR-695. The BN is designed
for operation with all surface-detection radars, with SD series (submarine
radars), with SP-1M, SK-1M, and with fire-control radars Mark 4 and Mark
Power supply.-225 watts, 105 to 125 volts, 50 to 425 cps.
Indication and data output.-Data displayed on A-scope of associated radar as a downward deflection. It can also be displayed on PPI. There is a separate A-scope for fire-control.
Transmitter specifications: Frequency 157 to 187 Mc. R-f source 15E. R-f lines Flexible coax, PT-5. Pulser type Hard tube. R-f peak power 1.0 kw. Pulse rates 0 to 500 pps. Pulse lengths 5 to 9 micro seconds.
Receiver specifications: Type Superheterodyne. Stages BN: 2 r.f.; 5 i.f. BN-1: 1 r.f.; 5 i.f. Local oscillator 6J5. Intermediate freq. 28 to 32 Mc. (stagger tuned). Band pass 4 i.f. Mixer BN: 9006. BN-l 6J6. Signal+noise/noise 3 to 1. Sensitivity BN: 96 to 100 db below 1 volt. BN-1: greater than 100 db below 1 volt.Antenna specifications.-Vertical dipole when using "steering-wheel" or "life-preserver" type antenna. Use of directional antenna depends on tactical requirements.
Tube complement.-1 type 6J6, 1 type 6SH7, 1 type 9006, 1 type 6J5, 9 type 6AC7, 3 type 6H6, 1 type 6E5, 1 type 6AG7, 2 type 6SN7GT, 2 type 6L6GT, 1 type 3B24, 1 type 5U4G, 1 type 15E
Dimensions and weights Unit Height Width Length Weight Inches Inches Inches Pounds Transmitter-receiver 14 3/8 20 1/16 20 1/2 110 Duplexer, CT-50ACW 4 3/4 4 5/8 21 18 Antennas: CTZ-66ACF CTZ-66ACG CTZ-66ACF CTZ-66AFULiterature.-Instruction book (Ships 232A). "Servicing IFF Mark III equipment with TS-182/UP Test Set" (NavShips 900, 104).
REFERENCES:The information enclosed here is excerpted from:
Catalogue of Naval Electronic Equipment-April 1946- NavShips 900,116.