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  1. lkm

    Z80 Microprocessor w/ Floppy drive

    Hi, I suggest you reference very old IBM PCXT's technical manual. Inside the manual, you can find the detail circuit of the floppy disk interface. You can reference it to build it for your own system. Also, the bios source list also can help you to program your own interface.
  2. lkm

    Analog Multiplexing (Multiple Duplexing)

    Hi wstorts, I donot suggest you to build 1024 channels switches. it need multi-stage of switches and it will cause a big distortion of the signal. The distortion will accumulate to the last stage and make the output signal very noisy. 1024 coaxial cables will bring you big problem in the cable...
  3. lkm

    RF AMPLIFIER LINEARITY

    Hi, I have this book which may satisfy your need. I have read it and I feel it is very good on both theorically and engineering. Feedforward Linear Power Amplifiers ISBN 1-58053-022-2 Nick Pothecary Artech house Publishers LKM
  4. lkm

    hex code problem

    Hi Lewish, Yes, it is a very easy, so it is common, trick. If I face your situration, I'll write a simple program to re-arrange the data and not going to hardware. All the computer can make it very soon to verifly the result. This is my style for your reference. LKM
  5. lkm

    phase error measurement

    Hi Paul51, The phase margin is not very meaningful in the real world. The problem we found about the phase margin is the phase linearity or phase margin Vs frequency. If you want to measure the phase error or insertion phase, a vector network analyzer will help. The other terms named...
  6. lkm

    hex code problem

    Hi Paul51, I don't think it is guilty to study on other people's work. We can learn from other people under the respect of the original. The similar case happened on the IBM PC bios. Finally, the reverse engineering is legal. Regarding to your question, the program you need is the...
  7. lkm

    IP65 standard

    Hi Carl, Thaks for your information. regards, LKM
  8. lkm

    IP65 standard

    Hi, I just read a document and memtioned there is a waterproof standard called IP65. Does anyone can provide some web pages which descript it. Thanks and Regards, LKM
  9. lkm

    power for GSM towers / antennas

    Jbartos is talking about the directly damage from lighting. We need to consider this issue as basic consideration. After you have protect from the direct damage from lighting, you need to consider the sensitivity of the front-end amplifier. It may be damaged because of the induction of the...
  10. lkm

    My 433MHz oscillator did not work!

    Hi, The SAW doesnot contain any RLC component inside. SAW stand for surface acoustic wave. Inside the SAW their is a Glass or ceramic with 2 forks to transmite and recieive the ultra sound wave through the media. The Q-value of SAW is very high. You can't implement it by RLC as the small size...
  11. lkm

    Directional Finder(DF)

    You are right, it can seem as special radar and it just detect the direction only not the distance and range. The operation theory is also not different than Radar. Most of the Radar transmits a narrow beam of energy to space and record the time when it bounces back. The direction information...
  12. lkm

    power for GSM towers / antennas

    Hi, The lighning rods is a must for all outdoor electronic equipment. It can avoid the direcct damage from lighning. In Radio system, you will have another issue on the low noise amplifier protection. The antenna is receiving the E&M signal from air. When the lighning happen, the antenna will...
  13. lkm

    data transmission

    You can buy a fiber modem to transmit your signal by fiber optics. It is expensive for both fiber modem and optical fiber. I never tested before but it sounds you can use the RS-485 interface with twist cable to transmite low baud rate to 4KM. You may need some repeaters. I hope it help
  14. lkm

    How can I eliminate the voltage sinking?

    It sounds you are building a hot swap PCB and found the PCB will reset. Also, you PCB has a micro processor inside. I suggest you check the peak current of your PCB. It seem when you put the board to the slot, the capacitor draw a lot of current make the voltage drop. The way you can do is...
  15. lkm

    need high frequency power source

    Hi, What is the application? By your spec, it sound you need a TWT. The 2.4G TWT are usually used in the industrial heater or microwave oven. You may check the www.rell.com they supply the TWT for industrial heater. I hope it help.
  16. lkm

    gain amplifiers

    If a device has a gain less than 1, we may call it attenuator. In low power and fix attenuation value, we use something like a resistors network to form it. In the case, we need a high power or using in an Auto Gain Control circuit, sometime we need a variable attenuator. This type of...
  17. lkm

    Calculating Phase shifts of componets (capacitors & inductors)

    This is we call the frequency domain analysis. It calculate similar to the resistor network but the capacitor and inductor are consider as a complex resistance or call it impedence. If you just talking about idea capactior or inductor, the phase angle will be 90degree different on sine wave. The...
  18. lkm

    multivibrator, A-STABILE

    There is an very old book named IC Timer Cookbook. Sam This book explain the basic theory of electronic timer by IC. I learn this topic from it.
  19. lkm

    Wilkinson Splitter Combiners

    You can find the introduction to Wilkinson splitter and combiners in the follwing web-page . http://www.uksmg.org/split.htm In the microwave application, the insertsion lost is higher. Also, the phase balance between 2 input/output will increase the insertsion lost. K M
  20. lkm

    Using an LED to trigger an audible alert

    Hi,<br><br>If I face your problem, I'll try to detect the blinking signal first. You can use differential circuit, build by a cap and an operation amplifier with some basic resistors network, to detect it. The output of the detector circuit will be triangle or square wave. You can build the...

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