Cubic 156-PMD User manual

OMII 56 - PMD
OPERATION MANUAL
For
MINE DETECTING SET ;
METALLICAND NONMETALLIC
C U B I C C 0 R PORAT I 0 N
MODEL 156 - PMD
3 May 1983

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TABLE OF CONTENTS
Section
1. DESCRIPTION AND DATA
1-1. Description
1
- 2. Tabulated Data
Section
II. ASSEMBLY AND DISASSEMBLY
2-1. Assembling the Equipment
2
- 2. PreliminaryAdjustment and Initial Checkout
2
- 3. Disassemblyand Repacking
Section
111. OPERATION
3
- 1 Operationwith Morethan One Mine Detector
3
- 2 Operating Procedure to Search an Area
3 - 3 Investigation of InitialAlarms (Chirps)
3
- 4 Stopping
Section
IV. MAINTENANCE
4
- 1 Operator Maintenance
4
- 2 Repair
Page
1
- 1
1
- 1
1
- 5
2 - 1
2
- 1
2
- 4
2 - 7
3 - 1
3 - 1
3 - 2
3 - 4
3
- 6
4
- 1
4
- 1
4
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Section I. DESCRIPTIONAND DATA
1-1. Description.
a. General Information.The Mine DetectingSet, Model 156-PMD, shown in
figure 1
- 1 , consistsof a mine detector, carrying case, carrying strap, one battery pack
for use inthe minedetector, and one spare battery pack. These components are
described inthe following paragraphs.
b. Mine Detector. The mine detector, shown infigure 1
- 2, isa portable
dynamic system capableof detecting buried nonmetallicand metallic objects,
specifically,buried antitank and antipersonnelmines. It is battery poweredand stored
in a carryingcase when not in use. The presenceof a mine is indicatedaudibly
through a headset. The minedetectorcomprises the subassemblies described in
paragraphs (1) through (4) below.
(1) Search HeadAssembly. The search head assembly consistsof
two
transmitting antennas, a receivingantenna and transmissionlines mounted on a
laminatedglass cloth plate. Inaddition, a transmitterand a receiver are mounted in a
housing on the search head.
A rubberbumper is mountedaroundthe search head as a
protectivedevice. The search head assembly generatesand radiates multiplechopped
radiofrequency signals and receivesand detects these signals.
(2) HandleAssembly. The handleassembly consistsof a short handle,a
long handle, a transmitter
- receiver housing, and attaching hardware. The short handle
is
attached to the search head by means of the transmitter
- receiverhousingand can be
adjusted and held at the most convenientangle
for use by means of a friction clutch
arrangement.The long handle,consistingof five nestingtubular aluminum sections,
fastens to the short handle by means of a bayonetcoupling. Itcan beextendedto any
intermediate length betweenapproximately 19inches (0.48m) and
57 inches (1.45m)
and isclamped at the adjusted position by means of the knurledcollets on each
section. This handleis ordinarily used in the normalwalking search operation, allowing
the operator to hold the search head about 4 feet
( 1.2m) away from his body.
~ ~~~~ ~~
1 - 1

CARRYING CASE (TOP W)
CARWING SrzzAp
Figure 1-1. Mine Detecting Set, Model I56-PMD
1 - 2

S E A R C H nmD
1
SHORT HANDLE
/
SHORT HANDLE
EWER HOUSIN
CONTaOL Box
CARRYING STBAP
/ /
I
TRANSMITTER -
RECEIVER HOUSING
/ /
Figure 1-2. Mine Dete-aor (Assembled)

(3) Control BoxAssembly. The control box assembly containsthe
processor modulewith its associatedelectroniccomponents and the battery pack.The
control box housingis an aluminumwater
- tightenclosure.A gasketedsteel cover
secured by four latches sealsthe control box. The control box mounts the onloff switch,
the cableto the search head,and the headsetassembly.A test connector is provided
for test purposes.A hook onthe control box enables itto be attachedto the belt and
thus relieve strain on the operator's arms when operating inthe prone position.
Note: The shorting plug must be plugged intothe test connector at alltimes, as removal
disconnects the battery powerfrom the system.
(a) Processor Module.The processor convertsthe output
of the
search headto an audio signal
so that it may be heard inthe headset.
(4) HeadsetAssembly. The headsetprovides an audible indication of
the signals producedinthe search head and then processedin the control box. The
headsetassembly consistsof
two earphones,joined by an adjustablestainlesssteel
headband,and a headsetcable. Rubber ear cushions are fastened over the
two
earphones to cut out extraneous noiseand makethe headsetcomfortableto wear. A
clip is provided
so that a pull on the headsetcablewill not place a strain on the
operator's head.
c. Carryinn CaseAssembly. The carrying case assembly is usedto store the
mine detector,its battery packs, and the carrying strap. The case iswaterproof and is
fittedwith insertswith cutouts intowhich the various components
of the mine detecting
set are stored when not in use.An air valve is locatednearthe latchto the right of the
handle of the carryingcase. Opening the valve equalizes the air pressurewithin the
carryingcasewith the air pressureoutside the carrying casewhile the equipment is
beingtransportedby air.
d. Battery. Five replaceableC
- sizealkaline batteries ina removableholder,
providingplus
7.5 Volts (nominal), are normally usedto operatethe equipment.
(Optionally,a rechargeablelead
- acidbattery or a BA-58471U lithium batterywith a
connector adapter can be used in place of the alkaline battery pack.)
1 - 4

e. Carryina StrapAssembly. A carrying strap is providedto ease operation
inthe standing position by effectively reducingthe weight, and thus the strain
on the
arms. The carryingstrap assembly consistsof a long and a short strap to allow
it to be
used either in combinationwith a load bearing harness(suspenders),or without using
a load bearing harness.
1 - 2. Tabulated Data.
a. TechnicalCharacteristics.
RF Frequency Range
Audio Frequency; Search Mode
300 to 600 MHz
1 click every 2.5 seconds
3 to 150clicks per second
PointMode
Temperature Range(operating)
Temperature Range(storage)
- 30 " C to +50 " C ( - 25 " F to + 125OF)
- 55°C to +70"C ( - 65°Fto +155"F)
Battery Complement Battery pack, Cubic
P/N 171 01 3,
containingfive replaceablestandard
C
- sizealkaline batteries.
or: Rechargeablesealed lead
- acid
battery,Cubic
PIN B-l56A.
or: BA-5847/U, lithium primary
battery (plus adapter).
BatteryVoltage 5.5 to 7.5V
Battery Lifeat 20°C (70°F) 18 hourstyp. for alkaline battery pack.
10hours per chargefor lead - acid
20 hourstyp. for lithium battery.
battery.
b. Approximate Dimensionsand Weights.
Mine Detector (Assembled) Weight: 7 lbs
I I oz (3.5 kg)
Mine DetectingSet (Mine
Detector in Carrying Case) Weight: 22 Ibs (IO kg)
Dimensions: Length24.2 in (61.5 cm)
Width 16in.
(40.5 cm)
Height
7.3 in. (18.5 cm)
1 - 5

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Section II. ASSEMBLY AND DISASSEMBLY
2-1. Assembling the Equipment.
a. General.
(1) To a largeextent, the minedetector,as contained inthe carrying
case, is pre
- assembledas shown in figure 2-1. The short handle is attachedto the
search head,as is the control boxto the long handle.
(2) Removethe following itemsfrom the carrying case: The search head
with short handleattached, the long handlewith control box attached,and one
of the
two batteriesprovidedwith the equipment. If the carrying strap isto be used, remove it
also from the carryingcase. Proceedto set up the equipment as follows.
b. Battery Replacement.
(1) Battery Pack Insertion.Unfastenthe four latcheswhich securethe
cover to the control box. Insertthe battery pack intothe control boxwith the snap
terminals up. Note arrangement of the snaps on batteryplug and snap the plug onto
the
battery pack accordingly (Seefigure
2-2.). Replacecover on control box, check for
proper alignment, and secure with four latches.
(2) Battery Pack Removal. Battery pack replacementshould be
accomplishedwhen the voltage has droppedto below
5 Volts. The absenceof any
sound inthe headsetis a signal to the operatorthat the batteryvoltage has dropped to
5 Volts or lessand the system is no longeroperating. Removethe control box cover,
unsnapthe battery plug from the battery pack and removethe battery pack from the
control box.
(3) Battery Replacement. Remove the five C
- sizebatteriesfrom their
holder and insertfresh ones. Make sure the batteries are correctly installed by
observing the polarities indicatedon the holder.
NOTE:At temperatures belowabout0°C (32°F) the use of lithiumbattery BA-58471U is
recommendedfor betterservice life.
2 - 1

d
n
E
2 - 2

- TEST CONNECTOR
fWith Shorting Plug Installed)
'.
1
Figure 2-2. Control Box (Covet Removed)
2 - 3

c. Handleand Carrying Strap.
(1) Long handleAttachment. Attach the long handleto the short handle
by means of the quick
- disconnectbayonetcoupling. Engageand compress
spring
- loaded couplingand twist 114 turn clockwise.
(2) CarryingStrapAttachment. The carrying strap assembly is comprised
of a long strap and a short strap. Ifthe carryingstrap is used, snap the hook
of the long
strap around the handlejust belowthe coupling.Attach the short strap acrossthe chest
betweenthe right and left straps
of the suspenders. Attach the snap at the other end of
the longstrap to the ring inthe center of the short strap. (Seefigure 2 - 3.) If suspenders
are notworn, the short strap can be attachedto the end of the long strap and the
remainingend of the short strap can then be snapped to the attachment eye at the top
of the long handle.(Seefigure 1 - 2.)
d. Headset.
Puton the headsetwith the headbandforward. Adjust headband
so that the
rubber ear cushions press againstthe ears withjust enough pressureto create a partial
seal against outside noises. Fastenthe spring clip on the headsetcable to the
clothing
,
allowingenough slack between headsetand clip so that the head can beturnedwithout
adding pressureto the ear cushions.
2-2. Preliminary Adjustment and Initial Checkout.
a. PreliminaryAdjustment.
Preliminaryadjustmentcomprises adjustmentof the short handle to the
desired anglefor operationand extension
of the long handleto its full length.
(1) Extendthe long handle by looseningcollets approximately
I 12 turn inthe
opposite directionas indicatedby the arrow, adjusting sectionsto full length, and
tightening (directionindicatedby arrow) collets. Start at the top collet (largestdiameter)
and hold on to the handle section immediately above the collet being used.
2 - 4

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2-5

(2) With the search head resting on the ground, move the short handle
the angle desired,against the friction producedby the friction clutch.
(3) When usingthe carrying strap for operation inthe standing position,
adjust the lengthof the carryingstrap to a comfortablelength that will not restrictthe
requiredswinging motion.
b. Initial Checkout. To check the mine detectorfor proper operation,
proceed as follows:
(1) Holdthe search head approximately 5 feet (1.5m) abovethe ground,
then set the switch from OFF to the ON positionand listen forthe metronomeclicks in
the headset(1 click every
2.5 seconds). The mine detector is now operating inthe
SEARCH mode.
(2) Bringthe search head down near ground level and listen for switchover to
the POINT mode, indicatedby a suddenchange inclick rate (between
3 and 150 clicks
per second).
(3) Moving the search head away from the ground, the systemwill automatically
resetto the SEARCH modewithin 4 seconds after leavingthe vicinity of the ground, but
only ifthe minimumPOINT mode rate of
3 clicks per second can be heard in the
headset.
(4) Ifno clicks can be heardat all, the batteries may be lowor discharged.
Substitute battery pack with the spare one inthe carrying case.
(5) Set the switch to the OFF position.
NOTE: (For BA-5847/Uonly.) At temperatures below5°C (40°F) or after prolonged
usageat hightemperatures the starting voltage of the lithium battery may be belowthe
minimumvoltage requiredfor equipmentoperation,althoughthe battery is not dead or
defective.
To restorethe battery voltage, set the switch to ON andwait 1 to 2 minutes.
then set the switch to OFF and repeat initial checkout as described above.
2 - 6

2 - 3 Disassemblyand Repacking.
fo I I ows :
To disassemble the equipment for storage inthe carrying case proceed as
(1) Ifthe carrying strap is attached, unhookitat top and bottom.
(2) Collapsethe long handle, usingthe same procedureas for handle extension
but in reverse order, i.e. starting at the bottomcollet (smallestdiameter)
(3) Detachlong handlefrom the short handle by pushing down andtwisting
(4) Removethe battery pack from the control box. (See paragraph 2 - 1 .b.)
the coupling 1/4 turn counterclockwise.
(5) Placeeach item into the compartment allotted to it inthe carrying case
(figure
1-1).
(6) Closethe carrying case. The top section should fit on evenly and snugly
without forcing; if itdoes not, check for proper placement of the contents, fouled cables
etc.
(7) Securethe six latches.
(8) Closethe air pressurerelief valve.
2 - 7

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Section 111. OPERATION
WARNING
At alltimes during operationclicks should be heard inthe
headset,either at metronome rate or higher.
If clicks
disappear,stop operation immediately, as the mine detector
is no longer operatingdue to low battery
equipmentfailure. voltage
or possible
CAUTION
To maintainan acceptablelevel of operating proficiencyand
gain familiarity with the output sounds in point and search
mode,A mine detectoroperatorshould havea minimumof
two hoursperweek mtest bed operationwhen he is not
operating regularly in combat conditions.The test bed should
contain at least one dummy target, such as an empty wooden
or plasticcontainerwith minimumdimensionsof
6 " long x 4 "
wide x 4 " deep (1 5 x 10 x 1 Ocm), buriedwith its surface 2 "
(5cm) belowthe ground surface.
3-1. Operation with More than One Mine Detector.
Maintaina minimumdistance of 20 feet (em) betweenoperatorswhen morethan
one minedetector is being operated in the same area. This will prevent signals from
other minedetectors in the area from interferingwith returnsignals from mines.
3 - 1

3-2. Operating Procedureto Search an Area.
CAUTION
Immediatelyprior to each use of the mine detector,check its
operationby settingthe switch
to the ON positionwhile
allowingthe search head to rest on the groundwith no
movementfor aboutthirty seconds. After this time, any
slight movement of the search headshould cause a
switchover from search to point mode, as indicated by a
higherclick rate. Set the switch to the OFF position and
Proceedas described infollowing paragraphs.
a. While swingingthe search head at a height of approximately
3 inches
(7.5cm) above the ground over homogenoussoil (freefrom known anomalies such as
metal,tree roots; ruts, mounds,etc.) set the switch from OFF to ON. This action not
only
applies powerto the equipment, but also startsthe initiatizationperiod used by the
processorto form an estimateof the backgroundsignal level and background
variations
,
based on the signals returnedfrom the soil.
b. A click should be heard in the headsetat intervals of 2.5 seconds,
indicatingthe system isoperating inthe SEARCH mode. These clicks also function as
a
metronome and will make iteasy to sweep the search head at the optimumsweep rate
by synchronizing sweep direction reversalswith the clicks. (Seefigure 3
- 1 .)
c. While keepingthe search head approximately 3 inches (7.5cm) abovethe
ground, depending upon the surface condition
of the terrain, sweep the search head
from side to side at a sweep ratesuch as to make each change of sweep direction
(sweepend points)coincidewith a metronomeclick. (Sweep rate is approximately
7
feet (2.lm) in 2.5 seconds). With each sweep, advance a distance of no morethan 4
inches (IOcm) or about halfthewidth of the search head. (Seefigure 3
- 1 .) Ensurethat
the search head isparallel to the ground at all times as tilting the search headwill
producea signal similarto a mine signal. Operationinthe prone position is the same,
except the sweep rate
is approximately 3.5 to 4 feet (1to 1.2m) in2.5 seconds.
3
- 2