Technical Information Setup SYSTEM COMPONENTS Avalanche Beac

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Technical Information Setup SYSTEM COMPONENTS Avalanche Beac

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Avalanche Victim Search Helicopter Using Barryvox 2000
Technical Information Setup
SYSTEM COMPONENTS
Avalanche Beacon Receiver Barryvox 2000
External Helicopter Antenna
Antenna Cable Length Nylon Sheet
INTERCOM Cable Length
Transport (optional)
Mettlenstrasse CH-8193 Eglisau/Switzerland Phone: Fax: E-Mail: info@girsberger-elektronik.ch Internet: www.girsberger-elektronik.ch
Page HEA_ADE, 31.08.2006
Intercom Connector
SETUP
Intercom Cable Length 3-dimensional Active Antenna
Barryvox
2000
swiss made
Antenna Cable Length Avalanche Beacon Receiver Barryvox 2000
Ring Hook Suspending
INTERCOM CONNECTOR TYPE
Helicopter INTERCOM Systems have following connector types
7.10.7.20
NATO Connector Type TP-120 (U-93A/U) Nexus Type TP-101 (U-174/U) Nexus (U-174/U miniature body version U-93A/U)
7.45.7.55
MIC+
PLUG (Astralux, ASTL ARINC Connector
MIC-
MIC+
MIC-
MIC-
Type PJ-055B 2-pol 6.35
MIC+ MIC-
Type PJ-068
MIC+
standard version Barryvox 2000 comes with type U-174/U ('NATO connector'). Other connector types available upon request.
INTERCOM ADAPTATION
Electromagnetic interference from helicopter on-board electronics reduce receiver sensitivity thus range kind avalanche beacon search helicopter. Barryvox 2000 provides following features mitigating problem:
External Antenna
external 3d-antenna suspended about below helicopter. therefore away from source interference.
Galvanic Separation between Beacon Receiver On-Board Electronics
electrical signal path between beacon receiver on-board electronics separated galvanically. These circuits built into 2000 EXT.
Level Adjustment
signal from beacon into intercom system input. must connected using proper impedance signal levels. signal level adjusted over wide range means dial built into Barryvox 2000 EXT. Please Note: input used beacon, voice control (VOX) must disabled. other sources (helmet microphones crew etc.) should have switching enabled. This will minimize background noise that coupled into intercom system helmet microphones, thus maximizing range. This applies particular person operating antenna beacon open door (see picture page
Page HEA_ADE, 31.03.2005
disable switching input from 2000 EXT: Adjust threshold this input lowest possible value, relatively signals from beacon received continuously. this also affects setting helmet micorphone beacon operator, muffle this microphone means some rubber foam avoid picking environment noise which override signal from beacon. make sense additionally cover microphone with operator's hand while doing coarse search order allow weak signal from beacon dominate. enabled, helpful increase 2000 level means dial reduce threshold same time. well worth making these adjustments carefully, because they have major influence performance (range) beacon search system. best setting will always compromise. Also hints practical use.
CHECKING PROCEDURES
Helicopter
INTERCOM
Barryvox
2000
Avalanche Beacon Transmit Mode
Barryvox
2000
Antenna
Test setup figure:
Helicopter grounded, on-board systems off. Place avalanche beacon transmit mode about from helicopter (use batteries!) Connect 2000 intercom cable intercom input helicopter. Make sure switch intercom input disabled. disabling possible there other restrictions, section (intercom adaptation) more hints. Connect antenna 2000 place shown figure (about from helicopter, major axis line with remote transmitter, distance about Turn 2000 maximum sensitivity (new batteries!). beeps from transmitting beacon must audible distinct from background noise. Turn helicopter intercom system (but keep other on-board systems off). Adjust dial 2000 means small screwdriver, that beeps will volume, clearly distinct headsets crew members (see picture).
Page HEA_ADE, 31.03.2005
Connections Level Adjustment
PHONE INTERCOM
Note:
Carefully adjust PHONE-INTERCOM level means small screwdriver. When done, close dial opening with piece tape small sticker, order keep humidity beacon.
INTERCOM connector
External antenna connector
turns dial level adjustment output PHONE-INTERCOM mVeff mVeff into Ohms Min. left position (ccw) Max. right position (cw) Both ends with slip clutch, without hard limit
connections system must used other ways than described. particular, feed electrical signal into system.
Metallic objects within area about around antenna have some influence antenna performance. same reason, metal coated tape antenna. This also goes reflecting material, such Scotch-Lite etc.
successively turn on-board electronic systems including turbine. necessary, adjust signal level means 2000 dial. signal from transmitting beacon must remain audible despite additional acoustical electromagnetic interference. Please Note: environment should free from interference. some meadow place where sure there underground cables other metallic ducts. intercom disabled, signal level dial 2000 have maximum order signal above threshold. This will have adverse effect range.
HINTS PRACTICAL
makes sense divide tasks between pilot operator: operator installs antenna operates beacon receiver (sensitivity setting). pilot does search, i.e. flying direction increasing signal volume. instructs operator adjust sensitivity setting. soon helicopter airborne, operator suspends antenna about below helicopter. antenna attached helicopter means Nylon sheet descended through open door (also picture page Make sure there stress cable either end. necessary remove protective cover (option) from antenna search. During primary search, sensitivity dial maximum longest dash), altitude above ground about 20.30 soon audible signal picked pilot flies direction increasing volume. Since receive characteristic antenna three-dimensional, current orientation suspended antenna does matter. Also, possible pendulum movements affect receiver performance. volume does increase more, pilot instructs operator reduce receiver sensitivity. search considered terminated maximum volume attained with sensitivity setting helicopter will about above buried person. dropping marker (e.g. clolored cloth with attached weight), spot designated. Further procedures depend available resources: Either some available terrestrial personell takes over complete search means beacon probe, operator leaves helicopter completes task. assignment various tasks different among different organizations. case, advise perform thorough search practice.
Page HEA_ADE, 31.03.2005

Technical Information Setup SYSTEM COMPONENTS Avalanche Beac

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