Presentation on theme: "LH Series L-PER (The older blue homer and the larger H-Antenna)"— Presentation transcript:
1 LH Series L-PER (The older blue homer and the larger H-Antenna) Module 8ofCASARA ELT Training Plan
2 Training Must contact JRCC before activating ELT training unit. Give details.Frequency.Location.Time period.Contact Number.Should contact JRCC and advise when finished.
3 FUNCTIONAL CHECKThe effectiveness of the electronic homer should be confirmed using a hand held radio on the appropriate frequency.PARK AIRCRAFT, VEHICLE IN THE OPEN,AWAY FROM METAL BUILDINGSWARNING! USE OF HIGH-POWER TRANSMITTERS CLOSE TO THE DF ANTENNAE CAN DAMAGE THE UNIT.ELT TESTER SHOULD BE KEPT AT LEAST 50 FEET AWAY FROM THE ANTENNAE WHEN USING TO TEST
4 Settings For Search When you are searching for a signal. The homer must be set on the proper frequency.121.5 for Tasking.123.1 for Training.VOLUME & SENSITIVITY towards the “Maximum” range.
5 ELT –Mode Switch REC MODE TO DETECT AND MEASURE SIGNAL STRENGTH ONLY DF MODE TO FIND DIRECTION OF ELT SIGNAL
7 Little L-Per How it works REC Modeonly used for HandheldLeft side arrows on antenna is usedfor reference point to find direction ofstrongest signalNeedle indicates signal strengthUseful for confirming multiple DF centreMake sure the wooden cross arm is attached with the printing and arrows facing toward you.
9 Little L-Per How it works REC mode WEAKSIGNALSTRONG SIGNALMETERREC MODE MEASURESSIGNAL STRENGTH ONLY
10 Little L-Per How it works REC mode WEAKSIGNALSTRONG SIGNALMETERREC MODE MEASURESSIGNAL STRENGTH ONLY
11 Little L-Per How it works REC mode WEAKSIGNALSTRONG SIGNALMETERREC MODE MEASURESSIGNAL STRENGTH ONLY
12 Little L-Per How it works REC mode WEAKSIGNALSTRONG SIGNALMETERREC MODE MEASURESSIGNAL STRENGTH ONLY
13 Little L-Per How it works REC mode WEAKSIGNALSTRONG SIGNALMETERREC MODE MEASURESSIGNAL STRENGTH ONLY
14 Little L-Per How it works REC mode WEAKSIGNALSTRONG SIGNALMETERREC MODE MEASURESSIGNAL STRENGTH ONLY
15 Little L-Per How it works REC mode WEAKSIGNALSTRONG SIGNALMETERREC MODE MEASURESSIGNAL STRENGTH ONLY
16 Little L-Per How it works REC mode WEAKSIGNALSTRONG SIGNALMETERREC MODE MEASURESSIGNAL STRENGTH ONLY
17 Little L-Per How it works REC mode WEAKSIGNALSTRONG SIGNALProbable target areaMark your coordinatesTake bearingAdjust for magnetic variationDraw line on map
18 Little L-Per How it works DF ModeNeedle points to side with strongest signal.Needle centres with target in front or behind.Functional with very weak signal (you may not hear it).Works well with moving vehicle or aircraft.REC mode is only usable with the handheld H antenna as it relies on the diRECtional effect of the antenna design, and the ability to point the antenna at the target signal.DF is the only effective mode for vehicle or aircraft mounted antennas as the antennas can’t be turned.A moving vehicle gives an averaging effect on the signals which can cancel out some of the errors from reflections, etc..18
19 ELT Homer-Meter-DF Mode DF MODE SHOWS DIRECTION OF ELT SIGNALLEFT CENTER RIGHT
20 Handheld DF Use L-Per on DF mode. Find centre (there should be two ) 180 DEGREES APART.More than two centres?Means getting REFLECTIONS.use REC mode.Or move to another location.Take multiple bearings to the target.Triangulate with bearings.Watch for sources of error.Use DF mode to take bearings, REC mode if multiple centres occur (strongest is probably the target)Separate bearings by good distanceUse 90 degree roads to box the target and aid triangulationNeed a compassTake account of signal strength, low strength may mean you are far away or you are picking up a reflection20
21 Resolving DF Ambiguity Turn left or right to tell.Rule of thumb;If needle moves opposite of turn, ELT is in front of you.If needle moves in direction of turn, ELT is behind you.Follow the needle.
30 Little L-Per How it works DF Mode Probable target areaCENTERMark your coordinatesTake bearingAdjust for magnetic variationDraw line on map
31 Little L-Per How it works DF Mode-Situation CENTER
32 Little L-Per How it works DF Mode-Situation CENTER2nd-Centre
33 Little L-Per How it works DF Mode-Reflection CENTER
34 Little L-Per™ Signal Detected 6 Steps: use the full procedure every time!Turn the unit to RECeive, check proper frequency and volume.Turn the Sensitivity knob to HALF SCALE.This will prevent oversense and is a good starting point..Turn the unit to DF.Turn at least one FULL circle.Check: Use Turn to Tell: the needle will point toward the target.Use your compass, to get a bearing to the ELT.
35 ELT search basics Look for obvious target areas near SARSAT hit airports, heliports, depots.Look for high ground.Be at least 20 ft away from vehicles, wires, or other large, conductive objects.Persons other than the operator should be at least 10 feet from the antenna.Take numerous bearings.Box the target or triangulate.Typical actual handled by CASARA Ottawa is false alarm from a/c maintenance, ELT in shipment or similar, therefore targets are usually found at airports. This doesn’t mean that we focus on them but they make good starting points.Given that ELT signals are line of sight the higher you are the more likely you are to get a fix. Obviously homing from the air is the most effective (in most cases).As we will see later, bearings can be confused by the environment so take many bearings and use an average of results. In the case of searching with a quad on a ground vehicle staying on the move should give the best results (the motion averages the results).Try to box the target, this is mainly a consideration for ground searches, but also works well in the air. Find the point at which you pass the target then turn towards it at 90 degrees, until you pass it again, thus giving a clear indication of target location.35
36 Radio Direction Finding Two methods of RDFTriangulation (signal strength, bearing)Homing (signal strength and direction)36
37 TriangulationBest method for ground personnel to get an accurate fix when search aircraft support is unavailable
38 Triangulation-Taking Bearings Make sure that nothing magnetic is affecting your compass…like the hood of a car where the chart has been laid out.You must be able to receive the signal.Center up DF unit on the signal.Take the magnetic bearing (shoot an azimuth).Correct for magnetic variation.Plot your bearing (draw a line) on map.Move to another location and repeat the above steps.The ELT should be where the bearing lines cross.
39 Triangulation - REC Mode Reference to point ofStrongest signalindication39
43 Here Are Your Six Steps Again: RECHALFDFCENTERTURNBEARING
44 Note re choice between LH and LL-16 When both LH Little Lper ( Blue 1973 analog model ) and LL-16 Little Lper ( Orange 2006 digital model ) are available and serviceable, LL16 should be used during SAR DF tasking.This is because the Orange LL-16 is an improved model and provides more information, such as a numbered signal strength and a 4 way indication to the signal source.