Olson Technology OTPT-300A User manual

025-373426REVX1 2/19/03
OTPT-300A
LOW COST INDOOR
RETURNLASERTRANSMITTER
INSTRUCTIONMANUAL

025-373426REVX1 Page 2 of 8
TABLEOFCONTENTS
SPECIFICATIONS Page 3
SAFETYWARNINGS Page 4
INTRODUCTION Page 5
INSTALLATION Page 5
EnvironmentalConsiderations Page 5
OpticalConnectors andCleaning Page 5
Installation Page 6
InternalControls Page 7
ExternalControlsandTest Points Page 7
ACCESSORIES Page 8

025-373426REVX1 Page 3 of 8
ReverseFrequencyRange.................................................
ReverseFrequencyResponse...........................................
Ext.Aux.RFInputResponse.............................................
InputReturnLoss................................................................
ReturnLaserOutputPower................................................
ReturnPathNPR..................................................................
NPR41dBThreshold...........................................................
TestPoints............................................................................
OpticalConnector................................................................
Weight...................................................................................
Dimensions...........................................................................
5MHzto42MHz,or5MHz to 65MHz
±1.0dB5MHz to 42MHz or 5MHzto65MHz
5-300MHz+/-1.0dB
>16dB@5MHzto42MHz or 5MHz to 65MHz
+3.0mW+0.5mW
>15dBover 41dB NPR measured with 10dBfiber and Olson High
Sensitivity Return Band Receiver
-57dBmV/Hz
LaserPower1V/mW
LaserCurrent1V/50mA
SC/APCorFC/APC
0.5lbs.
27/16”Hx 11/16” W x71/16”D - 6.25cmH x 1.8cm Wx18cmD
OTPT-300 -Specifications ForUseWithDFBLaser
ReverseFrequencyRange.................................................
ReverseFrequencyResponse...........................................
Ext.Aux.RFInputResponse..............................................
InputReturnLoss................................................................
ReturnLaserOutputPower................................................
ReturnPathNPR..................................................................
NPR41dBThreshold...........................................................
TestPoints............................................................................
OpticalConnector................................................................
Weight...................................................................................
Dimensions...........................................................................
5MHzto42MHz,or5MHz to 65MHz
±1.0dB5MHz to 42MHz or 5MHzto65MHz
5-300MHz+/-1.0dB
>16dB@5MHzto42MHz or 5MHz to 65MHz
+1.6mW+0.5mW
>15dBover 37dB NPR measured with 10dBfiber and Olson High
Sensitivity Return Band Receiver
-57dBmV/Hz
LaserPower1V/mW
LaserCurrent1V/50mA
SC/APCorFC/APC
0.5lbs.
27/16”Hx 11/16” W x71/16”D - 6.25cmH x 1.8cm Wx18cmD
OTPT-300 -Specifications ForUseWithFPLaser

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SAFETY WARNINGS
LASER RADIATION
025-373426REVX1
turned-offorpreferably, disconnected whenever the opticalconnectorcoverisopenedandthereisnoinstalledfiber
(aswhenthe fiberconnectorisbeinginstalledor removed fromthetransmitterconnector).
TheOTPT-300Alasertransmitteremitsinvisibleradiationthat cancause
permanent eye damage. AVOID DIRECT EXPOSURE TO BEAM.
Operatethe transmitter onlywiththeproper optical fiberinstalledinthe
transmitteropticalconnector. Power totheOTPT-300Ashouldbe
NEVERUSEANYOPTICALINSTRUMENTTOVIEWTHEOUTPUTOFTHE LASER
TRANSMITTER. “OPTICALINSTRUMENT”INCLUDES MAGNIFYINGGLASSES, etc.
NEVERLOOK INTOTHE OUTPUT OFTHE LASERTRANSMITTER.
NEVERLOOK INTOTHE OUTPUTOFAFIBERCONNECTEDTOALASER
TRANSMITTER.
NEVERLOOK INTOORUSEANYOPTICALINSTRUMENTTOVIEWTHE DISTANT
ENDOFAFIBERTHATMAYBE CONNECTEDDIRECTLYORVIAANOPTICALSPLIT,
TOATRANSMITTERTHATMAYBE OPERATING. THISSPECIFICALLYAPPLIESTO
FIBERSTHATARETOBE CONNECTEDTORECEIVERS(SUCHASTHEOTOR-300)OR
OTHERDEVICESATANYDISTANCE FROMTHELASERTRANSMITTER.
HIGHVOLTAGE
Thepowersupply section (bottom section) of theOTPN-1000contains no user serviceable parts. There is
exposedhigh voltageinsidethissection.Only factoryservicetechniciansshould openthepowersupplysection.
FIREHAZARD
TheAClineinputfuse is contained in the OTPN-1000 IEC powerinputconnector. This fuse isa3AG,
0.5A,slowblowfuse. To avoid a risk of fire, this fuse should be replaced only with an identically rated fuse.
SHOCKHAZARD
TheOTPT-300Ais designed for indoor useonly. Directexposureto moisture must be avoided.

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INTRODUCTION
TheOlsonTechnology OTPT-300Aisacosteffectivefieldinstallable return lasertransmitterwithan RF
passbandof 5 to 70 MHz. The unit has a DFB laserwith 3mW output(+4.8dBm) or aFP laser with 1.6mW
output(2.0dBm). This transmitter isintendedonlyforindoor applications. Thistransmittermustbemounted to an
OTPN-1000Piconode. Itwillnotfunction as a stand-alone device. Thediplexfilter,test point, return OMI pad,
andACpower supply are part oftheOTPN-1000. The actual return passband isdeterminedby the diplex filter in
theOTPN-1000.The OTPT-300Aisequippedwithanauxiliaryexternal RF input for 5-300MHz operation that
canbeusedinupstreamvideoorblockconverterapplications.
ENVIRONMENTALCONSIDERATIONS
TheOTPT-300Aisspecifiedto operate from-10°C to +55°C. Itwill probably notrequire an air-
conditionedenvironment. Itshould be mountedinanadequatelyventilated area. Like anyotherelectronic
equipment,itwill probably havealongerlifespanif it isnotoperatedattheupper limit ofthetemperaturerange.
Installationin wet areasorareasofextremely highhumidityshouldbeavoided. Extremely dirtyordustyareas
shouldbe avoided if possible. Objects ordebris should not beallowed to block theopenings in the OTPN-1000
housingorfan. The unit should not beinstalledinareasthatareaccessible to children.
OPTICALCONNECTORSANDCLEANING
Thestandard optical connector is an SC/APC. In order to use FC/APC connectors, you mustorder a
conversionkit,OTLL-SCFCKIT. Thestandardopticalconnectorlocation is on the opposite sidefromthe RF
connector. Theconnectorcan be moved to theother side by swapping itwith a cover plate. Only ascrewdriveris
requiredforeither operation.
Eitherof these operationsmust be done beforethe OTPT-300Aismounted to the OTPN-1000. Failure
toreplace all of theOTPT-300Acoverscrewscancause RF ingress problems.
Thefiberendscanbedamagedbytheinsertionofcontaminatedconnectors. Sometypesof customer
damagetoconnectorsare not covered underwarranty. Fiberconnectorsshouldneverbe left uncovered.
Prepackagedalcoholwipes are the mostconvenientmeansofcleaningoptical connectors. Clean alcohol andlint
freewipes or swabsmay also beused.

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INSTALLATION
1. Ifthe OTPN-1000 is operational, REMOVE power from theOTPN-1000 before proceeding.
2. Removethe cover plate on the side of the OTPN-1000. Save the plateand screws in order to eliminate RF
ingressiftheOTPT-300Ashouldeverbe removed.
3. Carefullypush the OTPT-300Aontothe side ofthe OTPN-1000. Clean the side of the OTPN-1000with
alcoholif required. No heat sink gasket or compoundis required between the OTPT-300AandtheOTPN-
1000.
4. Firmlyscrewin the four mounting screwsprovided.Iftheoriginalscrewsare missing, use 4-40x7/8”or
4-40x1”screwswithlockwashers.
5. Apply power to the OTPN-1000.
6. Measurethe OTPT-300Aoutputpower with an optical power meter and record the result.
7. Remove power from the OTPN-1000.
8. Cleanthereturnfiberperyoursystemstandardsandinsert into the optical output connector.
9. Apply power to the OTPN-1000.
10. Measure theOTPT-300Alaser powerand laser current testpoints and record theresults.
12. Remove thetop cover fromthe OTPN-1000.

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12.ThespecificationforthereturnbandtransmitterRFinput level is -57dBmV/Hz (measured at the OTPN-1000
R.F. port). Thisvalue operates the system atthe NPR threshold. The OTPN-1000 hasaplug-in attenuator in
thereverse path. Also included is a -20dB testpoint in thereturn path. Note thatthe -20dB test point is before
theplug-inattenuator.Thesinglecarrierequivalent of -57dBmV/Hz is +9dBmV. Thepadmustbeselectedto
setthereturncarrier level to +9dBmVactual,afterthe attenuator.Witha test carrier present at theport,
measureitslevel at the reverse -20dBtestpoint. Use the actual level (test point+20dB)measured, to
determinewhatvalueofattenuatormustbeusedtoprovide+9dBmVaftertheattenuator.
EXAMPLE: TestPointreadingof+5dBmVplus -20dB test point equals +25dBmVminus +9dBmVequals
16dBpad required.
13.Firmly replace all OTPN-1000 topcover screws. Failure to doso can result incooling, RF radiation, orRF
ingressproblems.
AUXILIARYRFINPUT
Whenusing the OTPT-300AintheexternalauxiliaryRF inputmode(5-300MHz)thelevel will be
+6.0dBmVperchannelandhasnoinputattenuator or test point.
INTERNALCONTROLS
Switchingfrominternal diplex(5-42MHz)operationtoexternalRF input(5-300MHz)isachievedbyan
internaljumperJ1ontheOTPT-300Aprintedcircutboard.
Thereisno user adjustable internal laserpoweradjustment. Anychangetothelaserpower will result in
poorermodulation characteristics andreducedlinkperformance.
Thereturn pad and return test point arelocated inside the OTPN-1000 as shown above.
EXTERNALCONTROLSANDTESTPOINTS
TheOTPT-300 has 2 external DC test points. One reads laser current at1Vper 50mA. Atypicallaser
currentof25mAwould read.5Vat this testpoint. The laser power test pointis1Vper mW. This is for historical
tracking. Theopticalpowermeterisamuchmore accurate means of measuring power. Both of these test points
shouldbe measuredwitha highimpedancevoltmeter.

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