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Recent content by crazyboy

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    Equivalent Noise Figure of parallel devices in chain

    vfone: Both antennas are identical and looking at same portion of sky. So I can assume the input noise and signal powers are almost same in both antennas. As I combining the powers in almost same phase (using delay lines), can I follow this thumb rule of "3dB better" for Noise Figure as well ...
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    Equivalent Noise Figure of parallel devices in chain

    How to calculate the equivalent Noise Figure of receiver system with parallel inputs ? Suppose my system have 2 receiving antennas. Each antenna having a LNA with 3dB Noise Figure and Gain 10dB. I'm going to combine the power from 2 antennas and amplify over an amplifier having a Noise Figure of...
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    [SOLVED] Receiver Noise power Calculation

    Thanks a lot for replies :) My final goal is to specify the receiver noise power (Watts/Hz or Volts^2/Hz) of my complete system (including analyzer). Since I don't know the exact Noise figure of my analyzer I did a small test on my analyzer. I adjusted my Analyzer settings as follows ...
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    [SOLVED] Receiver Noise power Calculation

    Hello everyone, I doing a simple receiver noise power calculation. The system consists of an antenna with Low noise amplifier and subsequent attenuation and gain stages.There are no mixing stages. I managed to find out the equivalent Noise Figure(NF) of entire system using Friss-Noise figure...
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    Wide band Analog time delay Circuit Schematic

    @jiripolivka. I read you article on Active Isolators... very well explained. The idea of using a wideband MMIC amplifier cascaded with attenuators is promising. I'm having a doubt. My source signal is an Antenna's output which is delayed by this circuit and added with other antenna's power by...
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    Wide band Analog time delay Circuit Schematic

    Hi sunny...your'e quite funny:-D. Actually my aim is to delay the signal in one of antenna's path before power combining them. This can reduce the coherence loss of signal. Now I replaced the diode, with BA482 a low resistance 1.2 Ohm and low diode Capacitance 1.2pF VHF band switching diode...
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    Wide band Analog time delay Circuit Schematic

    Hi I don't know how to do VSWR simulation in LTSPice. I Googled it and found nothing helpful. If you know how to do it can know explain briefly? Thanks in advance...
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    Wide band Analog time delay Circuit Schematic

    Hi dear, I did this simulation in LTSpice. Obviously there will be attenuation depends upon the cable length and diode parameters. But in parallel I also measured its reflection loss in Vector Network Analyzer by terminating the other end with 50 Ohms and connecting the delay path with low...
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    Wide band Analog time delay Circuit Schematic

    Thanks for your valuable suggestions jiripolivka. I used a schematic attached in the image file. I delayed the signal by passing through a coaxial cable of required length. I simulated its frequency response in LTspice(image also attached). My headache is that the impedance is not matching...
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    Wide band Analog time delay Circuit Schematic

    Hi friends can any one suggest a schematic of a wide band (30-500MHz) analog time delay circuit? I need a maximum time delay of 5ns with steps of few pico seconds. I will be very much thankful:-D.
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    [SOLVED] Impedance matching of a wideband-antenna beam steering circuit

    Dear Friends, I'm new to this Forum. I find this very interesting and helpful. Now I want your valuable suggestions for my small project. Here I attached the circuit schematic of an analog wide-band beam steering circuit. I want to steer my antenna primary beam(8 degrees) by certain angle by...
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    Can anyone explain to me the concept of DFT and FFT please

    Hi friends, I'm a newbie to this form. I read this form on many questions and find it very important. I have a basic question on FFT. As we know that FFT of a sine wave will be a double delta functions one at +ve frequency and the other at -ve frequency over imaginary axis (based on theoretical...
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