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Recent content by Ricky761

  1. R

    Building an Analog Delay (guitar effect)

    hi, you might be interested to browse and check each circuit on this site: tonepad -- a resource for d.i.y. music projects cheers.
  2. R

    What happens when two antennas are connected to a coupler?

    Depends, if the length of the coaxial on both antenna are the same then the signal will divide in both anteena provided both antenna are the same with respect to each wavelength.
  3. R

    Problem with chattering in a batery charger

    Re: Batery charger problem. Try to install electrolytic capacitor across relay ( D1 diode ) say with a value of 4.7 to 10 microfarad or try to use another relay as well. :o
  4. R

    Problem with chattering in a batery charger

    Re: Batery charger problem. Pls check your relay , did you use 12 volts relay ?
  5. R

    Looking for a NiMH battery charger schematics

    Re: NiMH Charger Try this one **broken link removed**
  6. R

    practical application of yagi antenna

    Can you pls elaborate more and how it will fare in the real world? I have much interest in a yagi design and would like to know more in its appliaction and the feed system to use with it.
  7. R

    Antenna Diversity for Mobile Phone

    I thought that antenna diversity is implemented in the BTS but not in the mobile phone in itself?
  8. R

    location updation in GSM network

    Location update were done by the BTS with regards to your mobile phone by periodically interrogating it and update the HLR or the VLR in the MSC With the RTS there is a signalling channel that is responsible for this and I thinks this is what they call LaPd .
  9. R

    Which mosfet will be best to design 100W power amplifier?

    pa mrf-150 MRF transistor were manufactured by Motorola.
  10. R

    Design for a J-POLE dual band antenna

    Re: JPOLE antenna design Flatulent, Imean with regards to the design as shown with the arrow product, any details as to how to implement the feed as it seems that the radiator is isulated from the base so could I use the so-239 but how to connect the radiator to it ? ( the quarter radiator as...
  11. R

    Design for a J-POLE dual band antenna

    Re: JPOLE antenna design You are right the quarter wave rod is insulated from the base metal so this is diffirent from the other Jpole design . But how about the radiation pattern? will it be omni direction ? And if I want to do it DIY how simple I could implement the feed section I mean by...
  12. R

    Which mosfet will be best to design 100W power amplifier?

    pa 23 100w mosfet For 860 to 890 mhz you can use the transistor MRF1150 with a max rating of 150 watts with input of 25 watts and needs 50 volts and also it has a gain of 7.8 Db.
  13. R

    Design for a J-POLE dual band antenna

    Re: JPOLE antenna design The design from the arrow looks simple and sturdy but I'm a bit comfused as to how it will be feed . I did not see connector or wire connector to connect the coaxial ? :(
  14. R

    Design for a J-POLE dual band antenna

    Can you guys help me with a design for a J-POLE dual band antenna ( vhf & uhf ) that at leaqst can handle 250 watts input power. :o
  15. R

    Does GSM allow capacitor coupling?

    The advantage of using a coupling capacitor between circuit stages is that you are not constrained with the dc voltage difference between them but of course it introduce also loses specially in the higher band of frequency.

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