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RX_LEV & RX_QUAL

Viewing 11 posts - 1 through 11 (of 11 total)
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  • #43219 Reply
    swiftsu
    Guest

    hi,
    there are questions about GSM O&M.

    why did my nokia mobile phone say the RX_QUAL is bad(5 or 6) while the RX_LEV is OK(-50dbm) when i am calling?

    what’s the problem?and how can i deal with it?

    cheers,

    swift

    #43220 Reply
    swiftsu
    Guest

    BTW,i’m a novice in the Repeater field.

    #43221 Reply
    alexander
    Guest

    swiftsu, RX_QUAL is RX quality, RX_LEV is RX level, so I guess you know that quality and level are two different words, two different things, you may have signal with high level but it may have low quality (high amount of errors because of interference, HW problems)
    Alex
    http://www.dx200.biz

    #43222 Reply
    RSV
    Guest

    Do you have any sound transmitted duiring this test in DL? If no and BTS have a DTX mode on than the mobile trying to measure “nothing” and quality is obviously bad. But may be it is a interference.

    #43223 Reply
    Boko
    Guest

    If you use DTX you must go for Sub values.

    Regards,
    Boko

    #43224 Reply
    RSV
    Guest

    Than the question should be this way : What you are measure? RX_QUAL_FULL or RX_QUAL_SUB.

    BR,
    RSV

    #43225 Reply
    MMR
    Guest

    You might want to check the freq planning in that area.

    #43226 Reply
    MihaiZ
    Guest

    Swiftsu,

    If the signal is provided by a GSM repeater, the problem described by you can be due to repeater auto-oscillation (part of the signal comming out is “feeding” the input of the repeater) !!!
    The problem can be corrected if the following condition is satisfied:

    Antennas separation > Repeater’s Gain

    So, either you increase the separation between the pick-up and donor antennas or reduce the repeater gain.
    Most of the modern repeaters may have a AGC circuit (Automatic Gain Control).
    Good Luck!

    #43227 Reply
    sa
    Guest

    hi

    why do we need isolation between donor and serving antennae in repeater solutions?

    #43228 Reply
    Jason
    Guest

    I compair needing isolation between a donar and a serving antennas in a repeater, with when you hold a microphone too close to a speaker that it is broadcasting to. The mic picks up its own brodcast then it aplifies it and broadcasts it even louder, and again and again and again, until you remove the mic or shut down the amp.

    #43229 Reply
    sa
    Guest

    Thanks.It’s clear now.

Viewing 11 posts - 1 through 11 (of 11 total)
Reply To: RX_LEV & RX_QUAL
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