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DTF and VSWR measurement

Viewing 12 posts - 1 through 12 (of 12 total)
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  • 12th December 2007 at 05:50 #50034
    Habib
    Guest

    In a site, In DTF mode I am getting two peak 1.113 at 30.85(peak at antenna) meter and 1.072 at 28.60 meter(I think this is the antenna port).antenna length is 2.7 meter.

    In VSWR mode I am getting 1.217 in 943.82 mhz.

    To me it seems okay. But someone is saying that since the DTF value is high, it can not be accepted eventhough the VSWR value is less.

    Is that right?

    Can anyone tell me whether I can accept the value and explain the deatils in this regard.

    Please answer and it will be a great help if I get the answer quickly.

    27th January 2008 at 05:30 #50035
    Ibrahim
    Guest

    Habib,

    That’s right. Because u have an acceptable SWR reading for 943.82 MHZ and not all frequencies, whereas the DTF value may not at the same frequency u mentioned.

    Regards,

    27th January 2008 at 13:28 #50036
    RF
    Guest

    DTF it’s distance fo fault , it’s indicate the hurted point , your value I think just check the connector

    27th January 2008 at 17:11 #50037
    emreigrek
    Guest

    what is the acceptable peak value in dtf mode?

    13th September 2008 at 07:49 #50038
    Santosh Kumar
    Guest

    What Is DTF pls give explaion.How can we remove it?? Give so possibility

    14th September 2008 at 08:13 #50039
    finn
    Guest

    DTF? remove it? what do you mean? its part of the test.

    Habib,

    have you got a DTF with dummy load at the end of the feeder? try also DTF with the load at the end of the last tail. if its alright, then there is the problem with the antenna.. but you are in the range of 900MHz, so acceptable VSWR is limit is 1.4 = 15.6dB on Return-Loss. on the DTF acceptable limit is 1.05 along your cable from the origin to the end.

    20th April 2015 at 07:29 #50040
    huzaifa naveed
    Guest

    what is DTF?

    22nd April 2015 at 01:50 #50041
    bluep
    Guest

    DTF : Distance To Fault
    Using this mode to find the faulty point in feeder ( most of them comes from connector )

    @Habib: Your SWR results are ok. I think there is no problem

    26th February 2017 at 13:57 #50042
    Juzaillan Mohamed
    Guest

    what correct way to test antenna feeder system using anritsu site master for system 1710mhz to 2690Mhz? and how about gsm 800mhz until lte 2600mhz?

    1st March 2017 at 18:58 #50043
    jamil
    Guest

    hi Juzaillan all the GSM when you want to test it should be 100 different means if you have GSM 800 you should put the machine from 760 to 860

    7th May 2021 at 16:44 #81751
    Leonardo
    Guest

    Hi! What does DTF or VSWR stands for

    17th June 2022 at 09:56 #101151
    Wijerathna
    Guest

    Guys, when measuring with site master, is it the physical distance of the cable or an electrical distance? e.g. when I have a peak at 2m, does it mean 2m physical length or do I need to do a conversion
    Thanks

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