AN/CPN-3 · AN/CPN-3 Radio Set AN/CPN-3, is an air transportable radar beacon for ground...
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AN/CPN-3 Radio Set AN/CPN-3, is an air transportable radar beacon for ground installation, designed to provide range. direction and identification for the homing of planes equipped with search radars. 10 cm band. When attempting to home on this equipment, the aircraft equipped with airborne search equipment switches from radar "search" to "beacon" position. The signals from the aircraft, when received at the beacon, actuate the beacon transmitter, causing a group of coded pulse signals to be generated and transmitted to the aircraft where they appear as echoes on the indicator of the radar equipment. The distinctive keying or pulse grouping of the beacon sig- nals identifies the beacon to the homing aircraft. Performance, in general, has been good, and these beacons are in operational field and training use. In the British Isles, the beacons are operated in pairs, one automatically being put into operation by the failure of the other. An over interrogation gate and local interference eli- minator have been incorporated in the system. This equipment uses separate receiving and trans- mitting antennas; each a linear array of six elements of three horizontal dipoles, curved and equally spaced about a point. It is expected that Radio Set AN/CPN-3 will be re- placed by Radio Set AN/CPN-8. Test equipment required in the maintenance and tuning of this equipment includes Voltmeter IS-189, Test Set TS-14/AP, Synchroscope TS-28/APN, Phantom Antenna and Attenuator TS-74/UPM, Voltage Divider TS-89/AP, Wavemeter TS-111/CP. TUBE COMPLEMENT NO. TYPE NO. TYPE 2 417A 1 VR-150-30 3 5U4G 1 2APl 2 5Y3GT 1 6X5GT 8 6AC7 1 2J37 1 6H6 2 304TH 3 6L6G 1 829 4 6SJ7GT 2 1616 17 6SN7GT 2 8020 1 6Y6G 2 VR-90-30 1 VR-105-30 2 6AG7 BEACON HAS TO BE INTERROGATED BY PLANE, (CORRECT PULSE LENGTH SENT OUT; ALSO CORRECT WAVE,BY PLANE°S RADAR OPERATOR.) ili' Mast Head AS-9/CPN-S POWER INPUT 1.7 KW @ 115 VOLTS POWER OUTPUT 10 KW (PEAK) FREQUENCY TRANS. 3256 MC. REC. 3267 - 3333 MC TYPE OF SIGNAL CODED PULSE TYPE OF PRESENTATION RANGE CODED DISPLAY ON RADAR SCREEN DATA SUPPLIED BEACON IDENTIFICATION, (TO AIRBORNE SET) RANGE AND AZIMUTH FROM BEACON MAXIMUM RANGE LINE OF SIGHT TO 100 MI. PULSE LENGTH 0.5 MICROSECONDS P~LANE LOCAT E ITS POSITION WHEN BEACONS CODED SIGNALS ARE RE 1 ... , TURNED FROM PLANE'S INOJR +M- "' ,~ \,,..; \J1.-' #. T , L <I- T Radio Set AN/CPN-3 is an air transportable radar beacon designed to provide range, direction and identifi- cation for the homing of 10 cm band ASV radar puiper ci .rcft.f ' , July 1945 tion 4 - Graphic Survey 7i --
Transcript of AN/CPN-3 · AN/CPN-3 Radio Set AN/CPN-3, is an air transportable radar beacon for ground...
AN/CPN-3Radio Set AN/CPN-3, is an air transportable
radar beacon for ground installation, designed to providerange. direction and identification for the homing of planesequipped with search radars. 10 cm band.
When attempting to home on this equipment, theaircraft equipped with airborne search equipment switchesfrom radar "search" to "beacon" position. The signalsfrom the aircraft, when received at the beacon, actuate thebeacon transmitter, causing a group of coded pulse signalsto be generated and transmitted to the aircraft where theyappear as echoes on the indicator of the radar equipment.The distinctive keying or pulse grouping of the beacon sig-nals identifies the beacon to the homing aircraft.
Performance, in general, has been good, andthese beacons are in operational field and training use. Inthe British Isles, the beacons are operated in pairs, oneautomatically being put into operation by the failure of theother. An over interrogation gate and local interference eli-minator have been incorporated in the system.
This equipment uses separate receiving and trans-mitting antennas; each a linear array of six elements of threehorizontal dipoles, curved and equally spaced about a point.
It is expected that Radio Set AN/CPN-3 will be re-placed by Radio Set AN/CPN-8.
Test equipment required in the maintenance andtuning of this equipment includes Voltmeter IS-189, TestSet TS-14/AP, Synchroscope TS-28/APN, Phantom Antennaand Attenuator TS-74/UPM, Voltage Divider TS-89/AP,Wavemeter TS-111/CP.
TUBE COMPLEMENT
NO. TYPE NO. TYPE2 417A 1 VR-150-303 5U4G 1 2APl2 5Y3GT 1 6X5GT8 6AC7 1 2J371 6H6 2 304TH3 6L6G 1 8294 6SJ7GT 2 1616
17 6SN7GT 2 80201 6Y6G 2 VR-90-301 VR-105-30 2 6AG7
BEACON HAS TO BE INTERROGATED BY PLANE,(CORRECT PULSE LENGTH SENT OUT; ALSOCORRECT WAVE,BY PLANE°S RADAR OPERATOR.)
ili'
Mast Head AS-9/CPN-S
POWER INPUT 1.7 KW @ 115 VOLTSPOWER OUTPUT 10 KW (PEAK)FREQUENCY TRANS. 3256 MC. REC.
3267 - 3333 MCTYPE OF SIGNAL CODED PULSETYPE OF PRESENTATION RANGE CODED DISPLAY
ON RADAR SCREENDATA SUPPLIED BEACON IDENTIFICATION,(TO AIRBORNE SET) RANGE AND AZIMUTH
FROM BEACONMAXIMUM RANGE LINE OF SIGHT TO 100 MI.PULSE LENGTH 0.5 MICROSECONDS
P~LANE LOCAT E ITS POSITION WHENBEACONS CODED SIGNALS ARE RE
1 ... , TURNED FROM PLANE'S INOJR+M- "'
,~
\,,..; \J1.-' #. T ,L <I- T
Radio Set AN/CPN-3 is an air transportable radar beacon designed to provide range, direction and identifi-cation for the homing of 10 cm band ASV radar puiper ci .rcft.f ' ,
July 1945 tion 4 - Graphic Survey
7i
--
AN! CPN-3,
Radio Set AN/CPN-3 in rear of truck.
Radio Set AN/CPN-3 front view, doors of housings open.
RADIO SET AN/CPN-3
Component
Radio ReceiverCoderMonitorRadio TransmitterPower SupplyMast HeadAntenna Support
Nomenclature
R-11/CPN-3KY-1l/CPN- 3ID-13/CPN-3T-8/CPN-3PP-8/CPN-3AS-9/CIPN-3AB-2/CPN-3 includes Mast Head 20' High
TOTAL WEIGHT 1400
Size
8" x 18"8" x 19''8" x 19"
x 13"x 13"x 13"
43" x 4" diam.
and includes plugs cable adapters etc.Section 4 - Grakhic Surv'eyJuy14
LBS .
Weight
53 Lbs.40 Lbs.27 Lbs.
127 Lbs.
anon
July 1945
