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DTF and VSWR measurement

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

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.

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)

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,

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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