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Recent content by Fadi Mkhayel

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    multiple transmitters

    you take another approach. You may implement this algorithm. whenever you receive a certain message from transeiver '1' to transeiver '2',transeiver '1' is prevented from sending for the following 20ms and transeiver '2' is allowed to send only in this interval. whenever the timer '20ms' is...
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    multiple transmitters

    1st of all, there would be no interference if the two transmitters are not coherent , having the same frequency, so even if spatially they are close to each other it doesn't matter what does matter is the operating frequency. Yes they would if you make a tdm plan that is no module can transmit...
  3. F

    video operational amplifier

    hi all i need to use opamps in a circuit for analogue video. i need to know if there is certain opamps that i need or any one
  4. F

    sms based device control...need all tne details

    excuse me, the objective of my reply is to guide you but not to do your own homework.
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    sms based device control...need all tne details

    it's the same, the gsm module used will give directly these data at the rx pin.which would be connected to your interface circuit.
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    Problem in interfacing Xbee with at89s51 microcontroller

    i suggest that you should use a comparator of reference 0 and threshold 5v so if signal is -7 it will give 0v and if signal is 7v it will give 5v. regards. - - - Updated - - - i suggest that you should use a comparator of reference 0 and threshold 5v so if signal is -7 it will give 0v and if...
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    sms based device control...need all tne details

    This is so easy, what you need is a cell phone. Nokia for example provide at its development website a pdf containing all "at" commands available. what you would do is to connect the cell phone to the computer and install the driver for its modem. once you do so a serial com port is assigned to...
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    Oscillator frequency and Modulator Frequency?

    no for sure it isn't the same. the oscillator at the encoder is used as a digital clock and consequently determines the speed of operation of the encoder. modulator and encoader's frequencies aren't really related. The encoder give the baseband data which is modulated by the modulator on a...
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    Problem in interfacing Xbee with at89s51 microcontroller

    yes of course bro, the levels given by the serial xbee pins are ttl with -7 and 7 volts. so what you need to do is to make these levels 0 and 5 volts inorder for the microcontroller to understand that these are uart data.
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    AC Frequency conversion in SMPS

    what are you talking about, that is a total insane. In ups, a50hz modified sine wave signal is generated which is a square wave alternating between -220v and 220v and having one additional voltage level which is zero. The role of the torroid is to shape filter some of the modified sine wave...
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    Determining no of cycles for delay in PIC

    they are instruction cycles since the delay functions are made using various instructions and not using timer module, if you need an accurate delay with certain timing you can use the timer module of the pic.
  12. F

    inerfacing bluetooth module with PIC18f series

    any bluetoth module with spi interface or uart interface would be benifitial
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    data formats mismatch in serial communication between atmega128 and matlab

    it would be useful if you state what type of interface you are using to transmit between controller and matlab, if it's a standard serial interface, then make sure that the baud rate used by the controller is the same as that you specified in matlab
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    matlab programming code of pdf model for genration of cyclostionary signal

    first of all, you should understand what cyclostationarity stand for. a good reference is the book: Wireless Communication Systems: From RF Subsystems to 4G Enabling Technologies-ISBN-10: 0521114039, in chapter 18. Then you would know that some modulations and schemes are cyclostationary in...
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    What is the best way to learn the basics of Digital Signal Processing fast?

    you may search on youtube for the lectures taught by oppenheim, he's the father of dsp.

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