KL-900C

The KL-900C "AM/FM/ASK/FSK Transmitter and Receiver" system is an elaborate and self-contained laboratory device designed for practical exercises in AM/ASK and FM/FSK transmission systems.

The complete exercise system includes two sets
KL-900C1 and KL-900C2, consisting of 8 independent exercise modules:

• AM transmitter and receiver modules,
• FM transmitter and receiver modules,
• ASK/AM transmitter and receiver modules,
• FSK/FM transmitter and receiver modules.

List of exercises

AM transmission exercises

1. modulator of sinusoidal signal with acoustic frequency

2. modulator measurements

3. reference sinusoidal signal DSBSC

4. modulation depth factor

5. model trapezoidal signal

6. voice/antenna tuning

7. first intermediate frequency amplifier

8. second intermediate frequency amplifier

9. transmitter/receiver and frequency modulator/demodulator

10. music transmitter and receiver

FM transmission exercises

1. capacitive diode (varactor) voltage measurements.

2. quartz oscillator measurements

3. tuning of the frequency multiplier (for the second harmonic).

4. adjustment of the tuning circuit of the high-frequency amplifier. (for the second harmonic)

5. frequency multiplier tuning (for the third harmonic)

6. adjustment of the tuning circuit of the high-frequency amplifier. (for the third harmonic)

7. measurements of the acoustic amplifier

8. measurements of the reference frequency oscillator

9. FM intermediate frequency amplifier

10. frequency counter

11. music transmitter and receiver

ASK/AM transmission exercises

1. tuning of the w.h. amplifier. (reference values are the indicated data)

2. encoding of digital data (CDMA and Manchester coding)

3. calibration of the transmitter and receiver

4. communication between transmitter and receiver

5. analog transmission of digital signals

6 Analog signal transmission

7. music signal transmission

FSK/FM transmission exercises

1. voltage measurements of capacitive diode (varactor).

2. quartz oscillator measurements

3. frequency multiplier (doubler) tuning.

4. tuning of a frequency multiplier (triplier)

5. adjustment of the tuning circuit of the high-frequency amplifier.

6. digital data transmission (direct sequence and Manchester coding).

7 Adjustment of the ac amplifier

8. calibration of the HF amplifier.

9. receiver frequency detector tuning

10. decoding sequence adjustment

11. transmission and reception of digital data (sequence
direct and Manchester coding)

12. example of transmitting and receiving digital data

13. analog transmission of digital signals

14. analog transmission of analog signals

15. music signal transmission