community aerial system cas 3500 installation and service manual

Community Aerial System CAS 3500Installation and service manual

6500

For configurationsee inside.

-8 dB

-8 dB

-8 dB

-8 dB

OUTPUTS

IN

OF3581

RF out

0-20dB

Audio

x1MHz

x10MHz

Audiolevel

Audio in

Videolevel

Video in

BM450

x100MHz

LP in

LP out

In

S in

Out

0-20dB

170-230470-890 MHz

244-446MHz

0-20dB

0-20dB

A3540

In

Out

0.1-26.540-7088-110MHz

0-20dB

0-20dB

0-20dB

AM

BI

FM

A3560

CAS 3500, Installation and Service Manual /7 06-05-18

CAS 3500 Installation and service manual Please keep this manual in the amplifier cabinet or by the Radio Officer. CAS no:

Frequency range MHz

Checked by:

Date:

Installed and tested by:

Date:

For service contact:

(Or Naval Electronics)

Amplifier configuration:

6500-1


6500-2


General about radio and TV reception at sea The part of the frequency spectrum used for terrestrial broadcasting spans from approximately 100 kHz to 890 MHz. Naval Electronics AB is specialised on marine reception and distribution of these radio- and TV-signals. The terrestrial antennas are directional or omni-directional for marine use and the amplifiers are adapted to demands existing onboard a vessel. The performance of the Radio/TV connected to each single outlet is to a great deal depending on the calculation of the distribution system. For optimum design of the distribution system please refer to our Naval Handbook which describes this more in detail. Recommended signal levels for good reception: Band Frequencies Lowest signal (dBµV) Highest signal (dBµV) I 40-68MHz 60 84 II 87-108 MHz 60 84 III 174-230 MHz 60 84 IV-V 470-860 MHz 66 84 AM 0,15-25 MHz 40 80 FM 68-108 MHz 56 80 The signal level must not be over 117 dBµV in any place of the system. General remarks In some cases the gain level of the amplifiers is not sufficient for compensating the system losses, due to long cables. The problem can be solved either by an alternation of the cable path or by an installation of one or more line amplifiers. In some ports severe reflections from buildings, cranes etc. can cause distortion to the TV-picture due to the characteristics of the omni-directional receiving antenna. There is no remedy for such a problem.

6500-3


Installation 1.The Naval active antenna 1.1 Check that the antenna is equipped with a correct type of amplifier (red

colour for TV-FM, yellow for TV-FM-AM). When inserted into the antenna housing, the amplifier must be locked and sealed in accordance with the description on the data sheet for the antenna.

1.2 Mount the antenna as high and clear away as possible from other objects

(funnels, transmitter antennas, radar etc.), The best location is in the masthead with free paths in all directions. Make sure that the antenna is not mounted in the beam of a radar.

1.3 Connect the antenna to the coaxial downlead. This connection must be

carefully sealed and made waterproof (see antenna data sheet). 1.4 Unload the antenna connection from mechanical tension. Secure the

downlead by means of cable clamps. Avoid excessive bending of the coaxial cable.

2.The amplifier unit 2.1 Mount the cabinet on the bulkhead by means of four screws or bolts. It is

important that the ambient humidity and temperature is not to high. 2.2 Pass the input/output coaxial cables as well as the supply voltage cable (and

if used relay cable) through the cable inlets in the bottom of the cabinet. Strip the coax carefully. Be sure not to nick the inner-conductor and check for short-circuiting braid filaments.

Stripping of coaxial cable for supplied twist on connectors.

2.3 Mount the coaxial connectors by twisting on the supplied connectors. Do not

bend the coaxial cable over sharp edges and secure it by means of clamps. 6500-4


2.4 Connect all cables to the amplifiers and power supply except from the

antenna downlead. 3.Adjustments The cassette amplifiers are supplied with 24V DC from the internal power supply, and the antenna with 15V DC, providing that the mains supply voltage is switched on and the cut-out circuit is not activated (0 VDC at the relay connections). 3.1 Adjustment procedure if no measuring equipment is available: 3.1.1 Connect the antenna downlead to the power supply. 3.1.2 Check the TV-pictures and radio reception along the branch lines. 3.1.3 Decrease, if necessary, the gain of the amplifier(s) by means of the manual

attenuator (turn anti-clock-wise, max. 3 turns) until a clear and steady picture, (clean sound on radio) is obtained.

3.2 Adjustment procedure using signal generator and measuring receiver. 3.2.1 Connect the signal generator to the antenna connection on the power box. Attention The generator output must be DC-blocked 3.2.2 Feed a signal with a calibrated amplitude (e.g. 60 dBµV) and with a

frequency within the passband of the cassette amplifier, which is to be adjusted.

3.2.3 Measure the signal at the outlet with the lowest calculated level in each

branch line. The signal level should be equal to the generator output. Adjustment is possible by means of the manual attenuator at the cassette.

3.2.4 Repeat step 3.2.2 and 3.2.3 for the other amplifier units. 3.2.5 Connect the antenna downlead to the power supply and check the picture.

6500-5

DC connectors upper gable on amplifier


All specifications stated are subject to change without notice

Naval Electronics AB Höjdrodergatan 18, SE-212 39 Malmö, Sweden Tel. +46(0)40-29 20 45 Fax +46(0)40-18 74 13

Check currentconsumption ofTV-amplifier(s)and the manual

attenuator setting(see data sheet)

mA =________

Check currentconsumption of

Radio amplifier(s)and the manual

attenuator(see data sheet)

mA =__________

Check supply voltageto PS3522

(117 or 230 VAC)Check mainfuse

CheckRadio & Tvreception

Check mains voltageto the amplifier(s)

(24 VDC)

VDC =___________

Check supply voltageto antenna (15 VDC)

VDC =__________

Feed a signal froma TV-generatorinto the antennaconnection at the

powerbox.(ATTENTION. thegenerator must be

DC-blocked)Measure the

signal level directat the amplifier(s)

output(see data sheet)

Check connectors/cables at theinput/outputconnectors

Exchange theamplifier

Check outputfilter,outlets and

branch-line cables

Exchange fuse T800 mA L

Check antennacurrent

consumption(see data sheet)

mA =_________

Check fuse onPS3522

ExchangepowerboxPS3522

Check remote cut-outvoltage to relay

(0 VDC)

VDC =_________

Disconnectantenna downlead

cable.Check voltage atantennaconnector

on PS3522(15 VDC)

VDC =_________

Check antennaconnector and

downlead cablefor RF-interruption

Check antennadownlead/exchange

antenna amplifier

Connect a 100R/2.5% W resistorinstead of the

antennadownlead.

Measure voltageacross resistor

(15 VDC)

VDC =_________

Feed a radiosignal from a

generator into theantenna

connection at thepowerbox.

(ATTENTION. thegenerator must be

DC-blocked)Measure the

signal level directat the amplifier(s)

output(see data sheet)

Check connectors/cables at theinput/outputconnectors

Exchange theamplifier

Check outputfilter,outlets and

branch-line cables

Check OK

Check false

Radio reception OK but no TV TV reception OK but no radio

Trouble Shooting chart

6200-6

community aerial system cas 3500 installation and service manual

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