Thursday, June 19, 2008

EC 606 Communication Engg Lab-I


  • Design and set up a circuit to generate a DSB -SC signal using diodes.
  • Design and set up a circuit to generate a DSB sc signal using JFETs.
  • Design and set up an AM modulation system for a carrier frequency of 600 khz or

Modulating frequency of -----Hz.

  • Design and set up a circuit to Experimentally verify sampling theorem
  • Design and set up a circuit to generate a modulation scheme which uses LOS propagation.
  • Design and set up a modulation scheme for UHF and VHF range
  • Design and set up a circuit to generate a modulation scheme for modems.
  • Design and set up a circuit to experimentally prove the relationship

P+Q =C: A – B= C: where A,B,C,P,Q are RF

  • Design and set circuit to generate LSB signal.
  • Design and set up a circuit to generate a USB signal.
  • Design and set up a filter circuit whose impulse response is given below.(assume the necessary values)

  • Design and set up a circuit which has the following ideal frequency response. Make necessary assumptions.

  • Design and set up a circuit to block a frequency of ----- Khz.(make necessary assumptions)

  • Design and set up a frequency converter circuit which converts frequencies to a frequency of ---- Khz.

  • Design and set up a single tuned Rf amplifier with a centre frequency---- Khz and Band width -----.

  • Design and set up amodulation scheme used in sky wave propagation
  • Design and set up a modulation scheme which has the max. noise immunity.
  • Design and set up an FSK system which has a markfrequency----and space frequency----.

  • Design and set a circuit which has the following transfer function.

V2/V1=?

  • Design and set up a pulse modulation scheme whose position of Carrier depends on modulating signal.
  • design and set up a circuit to translate all radio frequencies from 560-1650 to 440 Khz.
  • Design and set up a circuit to obtain an RF sine wave of --- KHz, using min. no. of bulky components.
  • Design and set up a circuit which enables the receiver to adjust signals having varying signals strength to same signal strength with out adjusting volume control.
  • Design and set up a circuit which enables the receiver to adjust signals having varying signals strength to same signal strength with out adjusting volume control only if the signal strength exceeds certain signal strength.
  • A certain communication receiver passes only frequencies b/w --- to---KHz, with an approximate gain of 3.5 db. Design and set up a circuit to plot the frequency response . find q and Band width.

  • Generate a modulation scheme for transmitting a signal at a high band width for an area of about 100 sq.km.( not more than that – assume the surface is flat)

  • Design and set up a circuit to get o/p.

V(t)= 4 sin 628000+(cos ( 2Π 99 X 10 3 t) – Cos (2Π 101 X 10 3 t)

  • Design and set a pulse modulation scheme which works only when both rcr and transmitter are synchronization. Plot the waveform.
  • Implement the system with frequency response.

H(jω) =0 for 0 ≤ ω ≤ ωc

= 1 ω > ωc using reactive components only.

  • Design and set up a circuit which gives a waveform corresponding to the circled portion of spectrum


  • Design and set up a pulse modulation scheme which has varying power content
  • Design and set up high stable high Q AC generator circuit for a frequency of

------MHz

  • 33. A system requires 25KHz signal . Source available is 2.5KHz. Design and set up

a circuit to solve this problem

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