bids are invited for communication engg sonp dc regulated low voltage variable power supply electronic multimeter with different voltage ranges electronic digital multimeter with hand held type standard signal generator radio receiver trainer kits / deconstruction models am / fm signal generator super heterodyne receiver radio demonstration model kit optical fibre trainer kit cro dual trace digital frequency meter dso cellular mobile kit pulse modulation and demodulation kit data formatting and carrier modulation transistor trainer model kit carrier demodulation of data reformatting receiver trainer kit am transmitter trainer model kit am receiver trainer model kit fm communication trainer model kit sampling reconstruction trainer kit pulse code modulation transmitter kit pulse code modulation receiver kit delta adaptive delta sigma modulation and demodulation trainer kit kit if amplifier transistor based kit amplitude modulation demodulation ( dsb ) kit double balanced modulator / demodulator kit frequency modulator demodulator ( transistorized ) kit computer and locking range of pll kit frequency demodulation ( ic based ) kit sample and hold ( s / h ) function for digital study if amplifer ( ic based ) frequency synthesizer kit kit to measure characteristic impedance of symmetrical t network kit to measure image impedance of asymmetrical t network. kit to plot the attenuation characteristic kit for lpf, hpf, bpf kit for measurement of swr of line kit for plotting attenuation characteristics of crystal filter total quantity : 283