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Thread: RF Modules Range Optimisation

  1. 26th December 2007 11:48 AM #1
    X4ce
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    Default RF Modules Range Optimisation

    hello,

    I'm using RF Solution's Modules for wireless data transmission. Ther are separate TX/RX units modulating at 433.92MHz.

    I'm using MATRIX Board, 2" wire as antenna and some 2/3" jumpers.

    I can get a maximum range of 25 feet, max is 250m.

    Do i need to extend my antenna lenght to 17.3cm?
    Is my MATRIX Board doing fine?
    how long could be the jumper wires?

    Please suggest, pictures are attached.

    THX

    Attachment 16192

    Attachment 16193

    Attachment 16194

    Attachment 16195
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  2. 26th December 2007 02:00 PM #2
    X4ce
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    Attachments, previous dont work

    RF Modules Range Optimisation-sp_a0351.jpg

    RF Modules Range Optimisation-sp_a0353.jpg

    RF Modules Range Optimisation-sp_a0355.jpg

    RF Modules Range Optimisation-sp_a0357.jpg
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  3. 26th December 2007 02:13 PM #3
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    If I understood you properly, you are to use these jumpers only for data and DC lines and not for RF signal jumping to a point where from you could connect it to an antenna. such cases the signal is picked from the TX pin and by a shielded cable (like RG174 like), you may call it feeder cable, and extend to the point where you want to transmit. there on you connect it to the Antenna whose dimension is decided at 1/4 wave length.

    then the signal transfer would be optimal, even though the so called feeder may add little loss.

    Hope this can be of some use to you.
    Regards,
    Sarma.
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  4. 26th December 2007 02:13 PM #4
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    hi
    >>> RF Solution's Modules documentation recommends a 17.3cm antenna.
    Attached Images
    Last edited by ericgibbs; 7th July 2008 at 11:23 AM.
    Eric " Good enough is Perfect "
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  5. 26th December 2007 02:18 PM #5
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    @mvs_sarma

    Im using jumper wires for only TX,RX,DC not for ANTENNA, im connecting antenna pin to antenna using on board soldering, is this fine?

    BTW, is this MATRIX BOARD gonna effect somehow?

    @ericgibbs

    Should i use this length antenna on both TX/RX units?
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  6. 26th December 2007 02:46 PM #6
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    Nice info from Eric, and it should sort out your issue, provided the boards are optimally located in the cabinet you are using, thanks to Ericgibbs.
    Regards,
    Sarma.
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  7. 26th December 2007 04:09 PM #7
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    thx Ericgibbs & mvs_sarma
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  8. 26th December 2007 06:35 PM #8
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    Quote Originally Posted by X4ce
    @mvs_sarma

    Im using jumper wires for only TX,RX,DC not for ANTENNA, im connecting antenna pin to antenna using on board soldering, is this fine?

    BTW, is this MATRIX BOARD gonna effect somehow?

    @ericgibbs

    Should i use this length antenna on both TX/RX units?
    hi x4ce,
    The datasheet says both TX and RX , see the clip I posted earlier.
    Eric " Good enough is Perfect "
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  9. 27th December 2007 03:26 AM #9
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    Quote Originally Posted by X4ce
    @mvs_sarma

    Im using jumper wires for only TX,RX,DC not for ANTENNA, im connecting antenna pin to antenna using on board soldering, is this fine?

    BTW, is this MATRIX BOARD gonna effect somehow?

    @ericgibbs

    Should i use this length antenna on both TX/RX units?
    a photo of PCB implementation of Rx is attached for your appreciation. perhpas you may plan for a small pcb.
    Last edited by mvs sarma; 7th July 2008 at 12:14 PM.
    Regards,
    Sarma.
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  10. 27th December 2007 01:21 PM #10
    X4ce
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    thx sarma, ive implemented n gonna test my unit range :-)
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