LH Series L-PER
(The older blue homer and the larger H-Antenna)
Module 8
of
CASARA ELT Training Plan
Training
• Must contact JRCC
before activating ELT
training unit.
• Give details.
• Frequency.
• Location.
• Time period.
• Contact Number.
• Should contact JRCC and
advise when finished.
FUNCTIONAL CHECK
The 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 BUILDINGS
WARNING! 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
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.
ELT –Mode Switch
REC MODE
TO DETECT AND
MEASURE SIGNAL
STRENGTH ONLY
DF MODE
TO FIND DIRECTION
OF ELT SIGNAL
Little L-Per
How it works
Little L-Per
How it works
• REC Mode
–only used for Handheld
–Left side arrows on antenna is used
for reference point to find direction of
strongest signal
–Needle indicates signal strength
–Useful for confirming multiple DF
centre
ELT Homer-Meter-REC Mode
METER
REC MODE MEASURES
SIGNAL STRENGTH
LEFT-WEAK / RIGHT- STRONG
Little L-Per How it works
REC mode
WEAK
SIGNAL
STRONG
SIGNAL
METER
REC MODE MEASURES
SIGNAL STRENGTH ONLY
Little L-Per How it works
REC mode
WEAK
SIGNAL
STRONG
SIGNAL
METER
REC MODE MEASURES
SIGNAL STRENGTH ONLY
Little L-Per How it works
REC mode
WEAK
SIGNAL
STRONG
SIGNAL
METER
REC MODE MEASURES
SIGNAL STRENGTH ONLY
Little L-Per How it works
REC mode
WEAK
SIGNAL
STRONG
SIGNAL
METER
REC MODE MEASURES
SIGNAL STRENGTH ONLY
Little L-Per How it works
REC mode
WEAK
SIGNAL
STRONG
SIGNAL
METER
REC MODE MEASURES
SIGNAL STRENGTH ONLY
Little L-Per How it works
REC mode
WEAK
SIGNAL
STRONG
SIGNAL
METER
REC MODE MEASURES
SIGNAL STRENGTH ONLY
Little L-Per How it works
REC mode
WEAK
SIGNAL
STRONG
SIGNAL
METER
REC MODE MEASURES
SIGNAL STRENGTH ONLY
Little L-Per How it works
REC mode
WEAK
SIGNAL
STRONG
SIGNAL
METER
REC MODE MEASURES
SIGNAL STRENGTH ONLY
Little L-Per How it works
REC mode
WEAK
SIGNAL
STRONG
SIGNAL
Probable target area
Mark your coordinates
Take bearing
Adjust for magnetic variation
Draw line on map
Little L-Per
How it works
• DF Mode
–
–
–
–
Needle 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.
ELT Homer-Meter-DF Mode
METER
DF MODE
SHOWS DIRECTION OF ELT
SIGNAL
LEFT CENTER
RIGHT
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.
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.
Little L-Per How it works
DF Mode
CENTER
Little L-Per How it works
DF Mode
LEFT
Little L-Per How it works
DF Mode
LEFT
Little L-Per How it works
DF Mode
LEFT
Little L-Per How it works
DF Mode
CENTER
Little L-Per How it works
DF Mode
RIGHT
Little L-Per How it works
DF Mode
RIGHT
Little L-Per How it works
DF Mode
RIGHT
Little L-Per How it works
DF Mode
Probable target area
CENTER
Mark your coordinates
Take bearing
Adjust for magnetic variation
Draw line on map
Little L-Per How it works
DF Mode-Situation
CENTER
Little L-Per How it works
DF Mode-Situation
CENTER
nd
2 -Centre
Little L-Per How it works
DF Mode-Reflection
CENTER
Little L-Per™
Signal Detected
•
6 Steps: use the full procedure every time!
1. Turn the unit to RECeive, check proper frequency and
volume.
2. Turn the Sensitivity knob to HALF SCALE.
•
This will prevent oversense and is a good starting point..
3. Turn the unit to DF.
4. Turn at least one FULL circle.
5. Check: Use Turn to Tell: the needle will point toward
the target.
6. Use your compass, to get a bearing to the ELT.
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.
Radio Direction Finding
• Two methods of RDF
– Triangulation (signal strength, bearing)
– Homing (signal strength and direction)
Triangulation
• Best method for
ground personnel to
get an accurate fix
when search aircraft
support is
unavailable
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.
Triangulation - REC Mode
Reference to point of
Strongest signal
indication
Triangulation - DF Mode
Reference
To direction
of signal
Needle centered
Triangulation - DF Mode
ELT
Triangulation-DF Mode
Here Are Your Six Steps Again:
• REC
• HALF
• DF
• CENTER
• TURN
• BEARING
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.
Are there any questions?
CASARA
“THAT OTHERS MAY LIVE”
THANK YOU