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VSWR for 1800

Viewing 7 posts - 1 through 7 (of 7 total)
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  • #55105 Reply

    I am trying to measure the VSWR of a DCS 1800 cell, and all I get is unreasonable measurements. Please, guide me for this problem.


    #55106 Reply

    We always take 2 test in vswr machine one for distance to fault
    Another one for measure match ( frequency )
    If u are calibration the bird machine or any machine at 1800 .
    You suppose to do the this thing .
    First calibration must be full .
    Second test the frequency by press on auto if its gave u more them 1.5 for limit line means the feeder is dirty at contactor .
    Third distance to fault u must see the damage in connecter or feeder some time the contactor not preparing good and must be less them 1.05 for limit line

    #55107 Reply

    I remember, you should have a 1.4 VSWR limit on your SiteMAster and 1.5 for scaling. If you over the 1.5 and that is not acceptable. How does your DTF looks like? I hate DCS..

    #55108 Reply
    Furqan Mahmood

    what is a vswr..?
    wot we do wid it?wot we measure..?
    why vswr reading more dan 1.3 is nt good .?

    #55109 Reply

    The MTN want the limit line 1.6 for 1800mhz and 1.5 for 900mhz if u have diplexer for the (VSWR)
    And the better diplexer u will not face any problem when u used it is Kathrein .
    1.5 for 1800 mhz and 1.4 for the900mhz but most time i get between 1.3-1.4 and its good

    #55110 Reply

    sorry finn i write ur name up in the vswr for mtn

    #55111 Reply


    Definition of VSWR – Please refer some of your older books.(frankly i too dono.)

    Coming to the practical point. I hope you are having a VSWR meter. First check whether the frequency band is in 1800 Mhz. Mostly the range may be in 900 band n u may get false reading. Next, for DTF (Distace to fault)first give the app. distance of your comlpet cable length. most meters will have D1 and D2 points where in u can give the distance; the meter has to measure.

    Normal values has to be 1.4 for VSWR and 1.04 for DTF. If u get a value say 64.5 VSWR it means that the port is opened somewhere. u can also say that the signal which was sent by VSWR meter has not all returned back. Ultimately the job of a VSWR meter is to send a signal n check the value of signal returned and if not, the measure of signal loss, n also the distance where the signal is lost.

    if u get a a very high level VSWR, then disconnect the cable from vswr meter, n connect an omni/bulb type of antenna(2dBi) antenna n check the value, this i to know whether the value that u get once u connect to the cable is right.

    hope u r atleast a bit clear.

Viewing 7 posts - 1 through 7 (of 7 total)
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