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DTF and VSWR measurement

jamil - 1st March 2017  (18:58 GMT)

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

Juzaillan Mohamed - 26th February 2017  (13:57 GMT)

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?

bluep - 22nd April 2015  (01:50 GMT)

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

huzaifa naveed - 20th April 2015  (07:29 GMT)

what is DTF?

finn - 14th September 2008  (08:13 GMT)

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


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.

Santosh Kumar - 13th September 2008  (07:49 GMT)

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

emreigrek - 27th January 2008  (17:11 GMT)

what is the acceptable peak value in dtf mode?

RF - 27th January 2008  (13:28 GMT)

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

Ibrahim - 27th January 2008  (05:30 GMT)


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.


Habib - 12th December 2007  (05:50 GMT)

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.

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Last modified: 17 May 2017

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