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RF Receiver transmission question — Parallax Forums

RF Receiver transmission question

HENHEN Posts: 8
edited 2009-03-20 22:55 in BASIC Stamp
Hi,

I have an RF Receiver with a basic stamp 2, i want know if i can modify the Receiver transmission from 500ft to less. Is it possible? how can i reduce it? I need to adapt to environment...

Comments

  • Craig EidCraig Eid Posts: 106
    edited 2009-03-16 07:32
    Hen,

    You can reduce the reception range by reducing the·transmitter output power using a couple of different techniques. The antenna that is supplied with the Parallax module is not a 1/4 wavelength antenna and·thereby reduces the overall range - you can further reduce the range by using a shorter antenna.

    A second method, if you are willing to modify your transmitter board, is to add a current limiting resistor between the LADJ pin (level adjust) and VCC. I have attached a copy of the Linx data sheet that describes this method - refer to pages 2 and 6.

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    ························ Craig Eid


    ··········· Triad Research and Development
    Electical Engineering Design and Consulting Services

    ··················· www.TriadRD.com
    pdf
    pdf
    TXM-xxx-LR_Data_Guide.pdf
    374K
  • HENHEN Posts: 8
    edited 2009-03-20 02:15
    Ok, thanks Craig
  • NR1XNR1X Posts: 111
    edited 2009-03-20 12:24
    another approach could be to attenuate the signal... try covering the antenna with different objects....
  • HENHEN Posts: 8
    edited 2009-03-20 22:55
    that's right too...i'll try it or changing the antenna
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