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Operating And Installation Manual

Barrett 950 HF SSB, Operating And Installation Manual

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Installation details - 950 transceiver and 914 series antenna

Antenna

Antenna mounting

must

Antenna feed cables

Voltage standing wave ratio (VSWR)

In any radio system an effective antenna installation is essential. Because of the need to
reduce the size of HF antennas so that they can be fitted to a vehicle, mobile antenna
bandwidth becomes quite narrow and hence tuning is critical. In most cases the only tuning
adjustment that can be effected is adjustment to position. Particular attention must be given
to the antenna position if satisfactory performance is to be obtained. Refer to the
instructions supplied with the antenna you have selected.

The antenna mounting must provide a strong secure anchorage for the base of the antenna.
To obtain maximum radiation, the antenna base

be well bonded electrically to the

vehicle chassis. Paint, dirt, rust, etc. should be removed from the respective fixing points.
The mounting point must provide a low resistance electrical path to the main vehicle metallic
structure.

Antenna feed cables should be run (as far as possible) away from other vehicle wiring and
especially away from ignition high tension wiring. Where passing through body panels or
internal bulkheads, grommets must be used to protect the cables. Water-proof connectors
must be used when they are outside the vehicle.

After installation it is recommended that the VSWR of the antenna should be measured for
each channel. The instructions supplied with the antenna selected will detail this operation.

BARRETT 950 HF TRANSCEIVER

PAGE 110

HEAVY DUTY FUSE

& HOLDER P/N BCA90018

+13.8V

6 METRE POWER CABLE

SUPPLIED WITH TRANSCEIVER

6 METRE COAXIAL CABLE

AND CONNECTORS

P/N BCA90013

GND BLACK

6 METRE REMOTE

CONTROL CABLE

WITH 930/950

REMOTE CONTROL HEAD

SUPPLIED STANDARD WITH

930/950 REMOTE CONTROL

(TRUNK MOUNT)

TRANSCEIVER OR AS AN OPTION

IF DUAL CONTROL IS REQUIRED

WITH A 930/950 LOCAL CONTROL

TRANSCEIVER

EXTENSION SPEAKER

AND MICROPHONE SUPPLIED

STANDARD WITH REMOTE HEAD

914

SERIES MANUAL

TAPPED WHIP

ANTENNA

HEAVY DUTY

BASE AND SPRING

P/N 91400

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Summary of Contents for 950 HF SSB

Page 1: ...543373 www barrettcommunications com au Barrett 950 HF SSB Transceiver Operating and Installation Manual Head office European office ON VOL ON VOL ON VOL ON VOL BARRETT BARRETT MODE 8 MODE 8 SCRAM 7 S...

Page 2: ...18 Telcall s direct dial telephone calls 19 Beacon call 19 Sending a Telcall 19 Preset dialling 19 Direct dialling 21 Last number redial 23 Hang up call 23 Scanning channels 25 Halting scan 25 Selcal...

Page 3: ...options 51 Battery level 52 Protected menu 53 RF pre amplifier 53 Set Scan Rate 54 Set Scan Dwell 54 Set Signal Strength threshold Level SSL 54 External control options 55 Transmit over beep 56 Trans...

Page 4: ...tion 95 Unpacking and inspection 95 Fixed station installations 96 Transceiver position 96 Operating convenience 96 Air circulation 96 Proximity of transceiver to antenna 96 Power supply 96 Voltage dr...

Page 5: ...910 automatic tuning mobile antenna 117 Marine Installations 121 General 121 Antenna selection 121 Antenna 121 Transceiver and tuner mounting 121 Ground earth system 121 Corrosion 122 Portable Operat...

Page 6: ...speed transmit to receive switching a high stability frequency standard option and an efficient inbuilt cooling system option The Barrett 950 transceiver is available in a local desktop configuration...

Page 7: ...the green Rx LED is illuminated when transmitting the red Tx LED is illuminated The operating mode of the transceiver is indicated by the remaining LED s i e USB LSB AM Power volume control Mic Socket...

Page 8: ...t status information of the transceiver including parameters unique to the channel in use parameters that affect all channels if scrambler option enabled channel normally shown Channel Number Channel...

Page 9: ...gram channel Tune mode General scroll key Numeric key 1 General scroll key Numeric key 4 General scroll key Numeric key 2 General scroll key Numeric key 5 General scroll key Numeric key 3 General scro...

Page 10: ...up down keys on the microphone have the same function as the channel up down keys on the keypad Channel up Channel down press the key enter the channel number required using the numeric keys channel r...

Page 11: ...ple Note If the channel selected has not been previously programmed then the following is displayed Empty channels can only be accessed by direct channel selection and are not displayed when scrolling...

Page 12: ...ic keys Note If you don t enter a new destination ID at this stage and proceed to the next step he default destination ID the last received selcall callers ID or the last selcall sent ID will be sent...

Page 13: ...call to station 4321 example Note Last selcall sent was to 1234 Note If no selcall has been programmed on the channel in use an error message will be generated as indicated below BARRETT 950 HF TRANSC...

Page 14: ...key If the alarm times out the message Call received will be displayed periodically on the bottom line of the display as follows To cancel the Call received message either press the clear key or send...

Page 15: ...PTT or any key Once timed out the Call received message will not be displayed If the first three digits of the incoming call s destination ID are the same as the first three digits of the unit s selca...

Page 16: ...is heard then continue press the key enter the desired selcall destination ID using the numeric keys xx99 for a 660 960 telephone interconnect where xx is the 660 960 I D press the key wait for the b...

Page 17: ...beacon call Note Last selcall sent was to 1234 When a transceiver receives a beacon request call it responds by transmitting the beacon call revertive tones The beacon request call is not saved in the...

Page 18: ...been programmed into the transceiver then the emergency call will be made on the current channel only but will continue to send emergency calls until the transceiver is switched off When a revertive...

Page 19: ...tation is indicative of the quality of communication that can be expected on the channel in use refer to Selcall selective call section Beacon call To access preset telephone numbers on the Barrett 66...

Page 20: ...Making a call to preset telephone number 58 via a 660 960 telephone interconnect whose ID is 6099 example Note Last selcall sent was to 1234 BARRETT 950 HF TRANSCEIVER PAGE 20...

Page 21: ...nter the 660 960 destination ID using the numeric keys press the key enter the telephone number to dial using the numeric keys press the key when the telcall has finished sending listen for revertive...

Page 22: ...Making a direct dial call to telephone number 61894341700 via a 660 960 telephone interconnect whose ID is 6099 example Note Last selcall sent was to 1234 BARRETT 950 HF TRANSCEIVER PAGE 22...

Page 23: ...e sent When a call has been completed the caller must by sending a hang up code to the Barrett 660 960 press the key enter the selcall ID of the 660 960 being called using the numeric keys press the k...

Page 24: ...Hanging up call to a 660 960 with ID of 6099 example BARRETT 950 HF TRANSCEIVER PAGE 24...

Page 25: ...then press the scan key again to select it to start scan The Barrett 950 will halt scanning for the following reasons The channel has selcall enabled and a selcall signal is received Signal strength...

Page 26: ...he transceiver will stop scanning and decode the selcall signal If the selcall was decoded for this transceiver the audio alarm will sound and the following will be displayed If the signal strength mu...

Page 27: ...electing the symbol corresponding to that scan table This symbol is displayed on the bottom line of the display in the 2nd character position Scan table 1 enabled for this channel Scan table 2 enabled...

Page 28: ...e of the following keys or Pressing either of the above keys once will display the clarifier as follows Release the key pressed then press it again to begin adjusting the clarifier Holding the key dow...

Page 29: ...is enabled the mute opens only when speech is detected When the selcall mute is enabled the mute opens after a selcall sent to the unit has been received and decoded successfully When the SSL mute is...

Page 30: ...AFSK The mode key will temporarily set the mode for a selected channel until the channel is changed or the transceiver is turned off to select the required mode Note If the 500Hz filter option is phys...

Page 31: ...n two seconds and the programmed alarm will be audible from the speaker for less than 2 seconds To transmit the alarm select a channel programmed for alarm operation hold in the alarm key for a period...

Page 32: ...d the transceiver will transmit full power carrier on the channel selected at the of that channel When the tune key is released the display will indicate the forward and reverse power being delivered...

Page 33: ...ambler option PCB is fitted and enabled in the programming section refer to protected programming menu Scrambler and also to the Barrett PC based programming software To turn the scrambler on example...

Page 34: ...o a different value dependant on customer requirements The lower power symbol will appear on the display Note If a channel was programmed for low power during channel programming the selection of high...

Page 35: ...ID using the numeric keys press the key wait for the selective call to be sent wait for the remote transceiver unit to send back its position data or error message If the unit times out before the pos...

Page 36: ...ver display on receipt of the reply from the remote transceiver If the transceiver being requested for GPS data is not fitted with a GPS receiver the following message will be displayed on the request...

Page 37: ...then continue press the key enter the desired destination ID using the numeric keys press the key wait for the selective call to be sent the remote transceiver unit will send revertive tones confirmi...

Page 38: ...its GPS data If the transceiver is fitted with a GPS receiver but cannot retrieve GPS data from it due to lack of satellite data etc a timeout occurs the following message will be displayed BARRETT 95...

Page 39: ...display shows the call as follows This display is held for 3 seconds then the message received is displayed The alarm will sound for thirty seconds and then time out To stop the alarm before the time...

Page 40: ...where a Barrett 950 has sent out a status request and the unit called has responded by sending back the status bytes When the Barrett 950 receives a status request the call is not acknowledged to the...

Page 41: ...ayed When the transceiver requested for status has completed it s return status selcall and it is received successfully the status information will be displayed as follows to step through the status d...

Page 42: ...eiver and the forward power transmitted by the remote transceiver when sending the status revert selcall Displays the reverse power of the antenna connected to the remote transceiver If the transceive...

Page 43: ...story If there is no selcall history then the following message will appear on the display To abort selcall history mode activate PTT or press the clear key If there is selcall history the top line of...

Page 44: ...Pagecalls are displayed as follows to display pagecall message Statcalls are displayed as follows to display statcall information Etc BARRETT 950 HF TRANSCEIVER PAGE 44...

Page 45: ...y increment required then use the frequency up or down key to tune the receiver at the increment selected Tune receiver from 10000 000 kHz to 10500 000 kHz example or to position cursor under digit to...

Page 46: ...the tuning receiver mode then hold down until the following is displayed Enter a new frequency using the numeric keys to set the first scan limit boundary example below shows Scan Limit 1 set to 12 M...

Page 47: ...ill select scan increments of 100 Hz the display will revert to the tuning receiver display will commence scanning using the parameters set above The transceiver will halt scanning for the following r...

Page 48: ...onally required by PC programming Use the following sequences to display or change parameters of items in the menu section or to select the menu item required to view or edit enters the menu item for...

Page 49: ...reduce repetitive impulse noise eg vehicle ignition noise selects noise blanker on selects noise blanker off selects display back light intensity level 1 selects display back light intensity level 2 s...

Page 50: ...back light time out time of 5 seconds from last key press selects a display back light time out time of 30 seconds from last key press selects display back light always on selects display back light a...

Page 51: ...ay of signal strength level in receive and the channel usage information in transmit selects the display of channel usage information in receive and the forward power level in transmit selects the dis...

Page 52: ...Battery level the transmit voltage is the voltage recorded during the last transmit cycle this giving a indication of the batteries capacity under load BARRETT 950 HF TRANSCEIVER PAGE 52...

Page 53: ...nges to more critical parameters during normal operation of the transceiver If no access to protected menus is to be allowed to operators the protected menus can be barred using the Barrett PC based p...

Page 54: ...d by signal strength level if signal strength level mute is set or voice activity if audio mute is set The dwell time can be set from 1 to 10 seconds example selects 5 seconds select the level at whic...

Page 55: ...use of a Barrett 511 911 Automatic Antenna Tuner enables the use of Barrett 975 series linear amplifiers this feature enables the use of the optional second antenna socket that can be fitted to the re...

Page 56: ...transmitting selects transmit over beep on selects transmit over beep off When this feature is enabled the 950 transceiver will disable the transmitter if the PTT push to talk button on the microphon...

Page 57: ...t programmed The second is used as the self ID on channels programmed for use with RDD Radphone Direct Dial an Australian telephone interconnected HF service enter the selcall self ID1 using the numer...

Page 58: ...ime set to 5 seconds selects which type of alarm signal is generated on the External Alarm pin 17 on the auxiliary connector selects latched alarm the alarm output will be continuously active for 30 s...

Page 59: ...r hardware when fitted selects scrambler hardware PCB option fitted selects scrambler hardware PCB option not fitted This option enables or disables any audible annunciation tones associated with fron...

Page 60: ...t are disabled and not available Note the external GPS receiver must be outputting the NMEA 0183 RMC sentence to be compatible with the Barrett 950 selects internal GPS receiver if the internal GPS re...

Page 61: ...d at a time after the last key press specified by the scan resume time selected The example below will cause the 950 transceiver to resume scanning 1 minute after the last key press The channel up dow...

Page 62: ...e programming information from the Barrett PC based 900 series transceiver programming system The following steps are necessary to copy the configuration of one 950 transceiver to another Fit the DB25...

Page 63: ...On the master transceiver transceiver containing the information to be cloned select the cloning menu Alternating with BARRETT 950 HF TRANSCEIVER PAGE 63...

Page 64: ...ard and CCIR 493 WA2 in Australia format selcall Enter selcall self ID2 using the numeric keys for use on channels programmed for Australian RDD format selcall Note the self ID must not be set to X000...

Page 65: ...lowing If this is the case the cable connection should be checked and the cloning procedure repeated Refer to the operating manual supplied with the Barrett PC based programming software Programming a...

Page 66: ...a remote receiver through the 600 ohm balanced audio input port on pin 11 and 24 of the accessory connector on the rear of the 950 transceiver selects local receive and remote transmit i e the transce...

Page 67: ...he mark and space frequencies of the selcall decoder The test checks that the selcall decoder output is correct with respect to the mark and space frequencies audio mute test an internally generated s...

Page 68: ...he auxiliary connector with pins 2 and 3 connected together This test checks that the RS 232 port is operational VCO lock test checks that the VCO remains in lock to a channel frequency of 30 5MHz If...

Page 69: ...until a PIN number is entered correctly within 10 attempts If the correct PIN number is not entered within 10 attempts the transceiver can only be re enabled for normal operation by using the Barrett...

Page 70: ...rett PC based programming software Note To save time entering codes ten times before unlocking Enter 0000 0000 the transceiver will immediately display contact dealer On the transceiver receiving the...

Page 71: ...nel to be programmed Operation section direct channel change press the programming key enter the receive frequency using the numeric keys press the programming key enter the transmit frequency using t...

Page 72: ...selcall is selected on the channel being programmed Use the scan key to select the scan table required Select the symbol corresponding to the scan table required This symbol is displayed on the bottom...

Page 73: ...n and can be programmed in the factory to customer requirements to any two tone alarm combination if the option is not programmed this alarm defaults to the RFDS alarm The tune key toggles between Ant...

Page 74: ...he channel into scan table one low power on transmit RFDS alarm and label BARRETT The example assumes that channel 101 was already selected by direct channel selection see Operation section direct cha...

Page 75: ...to enable scan table one until R is shown to select RFDS alarm to select low power or to select channel label until LSB is displayed BARRETT 950 HF TRANSCEIVER PAGE 75...

Page 76: ...channel to connect on when commanded by its operator to communicate with another station The Barrett ALE controller s powerful memory stores up to 10 000 sets of LQA information 100 channel configurat...

Page 77: ...s receive sounding s and transmit soundings if soundings are enabled on your transceiver Whilst ALE scanning the following messages may be displayed occurs when your station receives and ALE sounding...

Page 78: ...from the calling station the link is successful an audible alarm will sound after which you can start communication with the station that called you the link was unsuccessful you are linked to another...

Page 79: ...ious two steps only occur if the channel is also programmed for CCIR 493 based selective call use if not programmed for selective call the station list display below is selected by the first key press...

Page 80: ...elf ID the ALE call sequence has commenced you are waiting for a response the called station the called station has replied and you are acknowledging you now have a link established with the station y...

Page 81: ...nk attempt failed when selecting a self ID you selected a self ID that is not programmed a null ID no channels are programmed for the station you are attempting to call the station you called rejected...

Page 82: ...for CCIR 493 based selective call use if not programmed for selective call the station list display below is selected by the first key press above or to scroll through the station address list Making...

Page 83: ...or select a new self ID to this point if using the default self ID the ALE call sequence has commenced Either Or BARRETT 950 HF TRANSCEIVER PAGE 83...

Page 84: ...are calling The following error messages may be displayed the link attempt failed when selecting a self ID you selected a self ID that is not programmed a null ID no channels are programmed for the st...

Page 85: ...anning if you were in scanning before the ALE link If the station you are linked to closes the link the following will be displayed remote station closes link your station resumes ALE scanning if you...

Page 86: ...If the ALE option has not previously been enabled the following will be displayed Pressing the menu key will enable the ALE controller The next time you enter the ALE section the first display will be...

Page 87: ...te its in formation on network link analysis For correct ALE operation sounding should be left on all the time Note If ALE silent mode is selected on the sounding On Off option setting is ignored and...

Page 88: ...table within the ALE processor The decay can be disabled or set to between 1 and 8 hours Switching the sounding off and setting a decay time of two hours would result in the record of a perfect chann...

Page 89: ...ds these signals sequentially The total length of the sounding transmission is the product of the sounding signal length and the number of channels If the sounding signal length is set to 10 seconds a...

Page 90: ...ER value of a transmitted ALE word the greater the error A BER value of 0 indicates perfect reception of an ALE word The maximum BER value of 48 indicates that all bits of the ALE word were bad If a r...

Page 91: ...eturns to scan mode This option controls the number of times the ALE station tries to establish an ALE link using each channel in turn form the scan group The limit can be set between 0 and 98 If 99 i...

Page 92: ...different weighted averages of the old values and new readings Averaging reduces the effect that one bad reading might otherwise have on a perfect channel If a new reading is better than an old value...

Page 93: ...t mode the ALE controller does not respond to incoming ALE calls and does not send or receive sounding signals even if sounding is switched on Note You can still make ALE calls in this mode The ALE wi...

Page 94: ...enable the 950 transceiver to accept network data from the Barrett PC based ALE fill program Refer to the Barrett ALE fill software manual for details ALE disable This option will disable the ALE opti...

Page 95: ...technical adjustment is required for the equipment to operate correctly Note Some equipment has specific instructions supplied with it When this occurs those instructions over ride the general guidanc...

Page 96: ...plies and electrical equipment All Barrett transceivers require a supply voltage of 13 8 VDC In most vehicles or vessels this is available from the battery in the case of vehicles with a 24V system a...

Page 97: ...t for protection of the transceiver itself but to ensure that in the event of damage to the cable a fire risk does not exist The fuse used must be installed in the active wire as close as possible to...

Page 98: ...onfiguration the recommended mast height is 15 metres and at this height the 2 metre stub masts are each installed at a minimum of 19 metres from the mast base In locations with limited space the ante...

Page 99: ...ions ensure the antenna is as far from sources of electrical interference as possible and in a position that makes it impossible for the antenna to come in contact with high voltage overhead mains wir...

Page 100: ...metres and the recommended mast height is 15 metres In the inverted V configuration the recommended mast height is 15 metres and at this height the 2 metre stub masts are each installed at a minimum...

Page 101: ...s below the antenna As with all antenna installations ensure the antenna is as far from sources of electrical interference as possible and in a position that makes it impossible for the antenna to com...

Page 102: ...d for the antenna is as far from any source of electrical interference as possible and that under no circumstances it can come in contact with high tension power lines After mounting the helical dipol...

Page 103: ...at what frequency the best VSWR is obtained If this occurs at a frequency below the required frequency then the tips will have to be shortened on the pair of elements corresponding to that frequency...

Page 104: ...tors of a half wave wire dipole is 142 frequency of dipole in MHz metres To this an allowance should be made for extra insulators and halyards i e a 3 7MHz dipole length between the insulators 142 3 7...

Page 105: ...op the dipole and adjust both ends by an equal amount and repeat the above sequence until an optimum VSWR is obtained If a tunable transmitter is not available use a method of trial and error shorteni...

Page 106: ...possibility of accidental contact The transceiver should be mounted in a suitable position allowing easy operator access The antenna tuner should be mounted preferably out of the weather and as close...

Page 107: ...wires each radial being at least 5 metres in length When radials or mesh are used at ground level it is recommended that they be buried a few centimetres below the surface After mechanical installati...

Page 108: ...only the control head need be mounted convenient to the operator The transceiver may be mounted under a seat in the luggage compartment or any other out of the way place within the vehicle which allo...

Page 109: ...dy are run separately from the antenna coax cables and power cables By moving these cables apart you reduce the risk of RF feedback getting into the control cable which can cause problems with the tra...

Page 110: ...must provide a low resistance electrical path to the main vehicle metallic structure Antenna feed cables should be run as far as possible away from other vehicle wiring and especially away from igniti...

Page 111: ...urces of noise must be identified Ideally there should be no difference between background noise in the receiver with motor and accessories on and that with motor and accessories off If a detectable d...

Page 112: ...d well bonded to the coil body The charging system circuit consisting of either generator or alternator and a regulator may also be split into three parts A low pass filter such as that supplied in th...

Page 113: ...in identification Petrol engine ignition noise and contact breaker noise is a sharp staccato plop varying with engine speed It is only with this class of noise that the impulse noise limiter incorpora...

Page 114: ...onded to the chassis of the vehicle via a very low resistance path ie clean all joints to bare metal and use braid earth straps if any non metal joints are encountered Use only good quality coaxial ca...

Page 115: ...en too much capacity is already present this is frequently encountered when mounting the antenna too low on a vehicle bumper bar or when mounting close to bodywork as in cab over type vehicles In this...

Page 116: ...e following frequencies Channel 1 4030 kHz Channel 2 4760 kHz Channel 3 5190 kHz Channel 4 5254 kHz Channel 5 7180 kHz Channel 6 8199 kHz Channel 7 9134 kHz Channel 8 9145 kHz Channel 9 10567 kHz Chan...

Page 117: ...ng base a further 20 30 degrees clockwise while holding the top of the ABS antenna body with a free hand Failure to fit the whip assembly on the ABS antenna body correctly in accordance with the above...

Page 118: ...ied by a series of low pitched beeps at any point the 910 has failed tune Check all cables are correctly connected check the earth cable from the base of the 910 has a good connection to the vehicle b...

Page 119: ...l work as indicated in the diagrams FAILURE TO MAINTAIN THESE CLEARANCES WILL NOT ONLY REDUCE THE EFFICIENCY OF THE 910 ANTENNA BUT MAY ALSO LEAD TO INTERNAL RF ARCING AND FAILURE Select a position fr...

Page 120: ...ning Mobile Antenna is designed to with stand vibration to military type specifications on tyred vehicles some mounting positions on large prime movers particularly front mounted bull bars are subject...

Page 121: ...eater than 10 metres and less than 35 metres A whip antenna is generally used on small to medium sized power vessels There are different length whips to suit the vessel length Select a suitable positi...

Page 122: ...hould be as short as possible and use copper strap at least 50mm wide wider if available Consideration must always be given to the problem of electrolysis Severe structural damage may occur if electro...

Page 123: ...the PCB mounted tuned LED should be illuminated Now select the lowest desired frequency on the transceiver and repeat the above procedure The result should be the same except that the tune cycle may t...

Page 124: ...mporary base station Tactical rapid deploy tuned dipole TRANSCEIVER 12V BATTERY POWER SUPPLY 3 M ETERS 16 M ETERS COAXIAL FEEDER TO TRANSCEIVER EARTH STAKE WITH CROCODILE CLIP FROM ANTENNA CLIPPED TO...

Page 125: ...Sloping Configuration Inverted V Configuration BARRETT 950 HF TRANSCEIVER PAGE 125...

Page 126: ...from Linear Amp Ext 0 10V NMEA 9 Auxiliary PTT In Auxiliary PTT input Low to activate PTT 10 Scan Stop Scanstop input from external modem Low to stop scan 11 Bal Tx Audio In Balanced external Tx audi...

Page 127: ...xternal Tx audio input 600 Ohms 0dBm 25 Bal Rx Audio Out Balanced un muted Rx audio output 600 Ohms 0dBm Note 1 Pin 8 and Pin 20 External GPS input is selected using a menu function or set during prog...

Page 128: ...Because ground wave follows the contours of the earth it is affected by the type of terrain it passes over Ground wave is rapidly reduced in level when it passes over heavily forested areas or mounta...

Page 129: ...ossible optimum working frequency is 3 MHz A to C Possible optimum working frequency is between 5 7 MHz A to D Possible optimum working frequency is between 9 12 MHz EARTH IONOSPHERE 950 ON VOL ON VOL...

Page 130: ...ric conditions prevailing If he does not hear this revertive call or it is very weak he tries on another channel until a revertive call of a satisfactory signal strength is heard Refer to Selcall sele...

Page 131: ...stem will greatly affect the communications quality you will obtain Refer to the installation section of this manual for details Your local Barrett representative will be able to assist with your syst...

Page 132: ...S receiver whilst still giving access for the use of CW keys external speakers and external alarms The diagram below describes the pin functions of the connectors used on the accessory interface Headp...

Page 133: ...unt Barrett 900 series products in vehicles or vessels The cradle kit comprises the following parts 4 x M4 x 14 countersunk screws items marked 1 in diagram 4 x Nylon capstans items marked 2 in diagra...

Page 134: ...e slots provided in the heatsink and the left hand side plate Remove the screw on the PA transistor nearest to the pads used to solder the fan thermostatic switch to TH2 Replace this screw with the fa...

Page 135: ...ashers placed under each screw BCA90025 kit comprises 8 x M4 x 6 pan head screws Items marked 1 in diagram 8 x M4 nylon washers Items marked 2 in diagram 2 x 2 unit side plates Items marked 3 in diagr...

Page 136: ...from the rear making sure the front panel mates into the milled cut out in the rear of the 19 front panel Secure the transceiver in place with the remaining four M4 x 12 pan head screws items marked...

Page 137: ...eparated from any other wiring and should be placed as close to the metal block of the motor as practical to reduce radiation of any RF noise Ensure that the wire from the distributor points to the ig...

Page 138: ...ed to ensure they do not contribute RF noise They can be suppressed using MAR ACE filters or capacitors and the installation method given in the MAR ACE application note All metal objects on a vehicle...

Page 139: ...Note Specifications information and drawings in this manual are subject to change without notice BARRETT 950 HF TRANSCEIVER PAGE 139...

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