A PRESENTATION ONSTUDENTS’ WORK EXPERIENCE SCHEME

(SIWES)BY

AKINYOMI OLUWAFEMI JOSEPHEEE/08/3372

UNDERTAKEN AT ONDO STATE RADIOVISION

CORPORATION, OSRCP.M.B 739, ORITA – OBELE

AKURE, ONDO STATE.

BRIEF HISTORY OF OSRC OSRC was established during the Civilian Government of

Late Pa Michael Adekunle Ajasin in June 1982. Upon inception, a 1kW Ultra High Frequency (UHF) 23 Transmitter was installed at the former State Secretariat, Oke-Eda, Akure, Ondo State.

In November 1983, the TV station was transferred to Orita-Obele where it presently houses two transmitters (Townsend and Harris Transmitter) with an output power of 40kW each and operating at channel 23 on the UHF band. Both transmitters operate at a frequency of 487.25MHz, while the FM radio broadcast operates at a carrier frequency of 96.5MHz.

Apart from these, there are booster stations at Oka-Akoko and Okitipupa operating at channel 25 (503.25MHz) and 27 (519.25MHz) UHF respectively.

OSRC ENGINEERING PROFILE

WORK UNDERTAKEN DURING MY INDUSTRIAL

ATTACHMENT AT OSRC

• Studio operations, repairs and maintenance of studio equipment

1

• Mode of signal transfer from studio to transmitter {FM and TV}

2

• Opening formalities at the transmitter, taking of transmitter readings and signal transmission to the antenna

3

(SIWES) WORK CARRIED OUT

There are three TV studios and one FM studio at OSRC . signal generation starts from the various studios. Each studio is divided into two sub- sections both in the FM and TV sections; CONTINUITY STUDIO CONTROL ROOM in the continuity studio, I engaged in carrying out continuity

tests on the microphone (the neck and table micro phones), adjusting TV studio lightings in other to eliminate object shadows using a lighting console.

In the control room I engaged in graphics and animation making for news and other programs and signal sharing between the two studios (with the help of a televiser and a master controller)

I was appointed the sound engineer. I fixed the adjustment knobs (channel faders and audio equaliser) of the TV studios’ audio console

STUDIO OPERATIONS AND MAINTENANCE

Mode of signal generation and transfer The microphones receives voice signals and converts it to

electrical (electronic) signal; the TV studio cameras capture graphic positions and converts it to electronic signals.

The output of the microphones and cameras are fed as inputs into the audio and video console (mixer) respectively by means of coaxial cables.

Also, video and audio signals from DVD players, CD players and VHS are also fed respectively into the consoles.

The output of the audio and video console is fed into various monitoring devices, distribution amplifiers and circuitry conversions on the P.I.E (Program Input Equipment)

VIDEO MIXER

PROGRAMMED INPUT EQUIPMENT

SOME WAVE MONITORING DEVICES

VIDEO DISTRIBUTION AMPLIFIER

VIDEO DISTRIBUTION CIRCUIT

SOME WAVE MONITORING

DEVICES

AUDIO DISTRIBUTION AMPLIFIER

AUDIO DISTRIBUTION CIRCUIT

OPTIC FIBRE SYSTEM

AUDIO CONSOLE

Playback devices

TV CONTROL ROOM (simplified block)

microphones

camera

In-house speakers

Monitors (TV sets)

To transmitter

• Observing the switching on and shutting down process of the Harris transmitter

1

• Fault detection through meter readings and colour change2

• Signal flow from the transmitter to the antenna3

WORK CARRIED OUT IN TRANSMITTER SECTION

Opening formalities of the TV transmitter as part of work done (sigma HD 3050P1 Harris Transmitter)• Putting on the Harris transmitter occurs at about 6:30 am. The

Townsend transmitter on the other hand is operated from 10 pm to 12midnight. The switching on/off of the Harris transmitter is similar to that of the Townsend.

• Immediately the 810kva generator is powered on, all the lightings of the transmitter room is first switched on to aid illumination.

• The 3.5 tons and 7.5 tons air condition is powered on. This provides the air cooling of the transmitter components.

• The dehydrator is then switched on to suck out any residual liquid or moisture from the base of the antenna to prevent reflected power when the transmitter goes on beam.

• The TV main power supply is powered on which triggers on the surge suppressor.

• The AVR is energised (a terminology for switching on )

• A knob at the back of the transmitter (power knob) is turned from 0 to 1 (as indicated) and the earth switch is removed.

• The standby button located at the front of the transmitter is pressed down. This places the transmitter on filament voltage (this voltage heats up/warms the cathode plate of the IOT)

• We then wait for about five minutes before the transmitter goes on beam voltage (33kV dc).

• The PIE control button switches on all equipment on the rack.• At this point, we await signals from the studio. While we

await signal reception, a tone and colour bar can be generated right there in the transmitter using the tone and colour bar generator. This overrides any signal from the studio. When the audio/visual signal arrives, the tone and colour bar is disconnected and the incoming signal is beamed to the wider audience.

Fault detection and prevention on the transmitter

FM Harris HT 35/30CD Transmitter

SIGNAL TRANSMISSION FROM TRANSMITTER TO ANTENNA

CONCLUSION

The SIWES program has afforded me the opportunity to broaden my

understanding of communication regarding my profession. It opened me up to solve problems, Interact

and share practical knowledge with students from other institutions of

higher learning.

RECOMMENDATIONSThe university should be involved in the direct

placement of students (if not all but for some students) as this will reduce student loitering about looking for SIWES placement

A single visit/inspection by the supervisors from the university is not enough. A regular visit will install seriousness in the student and the company where he/she has been posted to.

Students on the other hand should endeavour to get experience instead of looking for places of higher pay. (knowledge is what generates wealth).

THANK YOU FOR LISTENING