Generic selectors
Exact matches only
Search in title
Search in content

jammer issue

  • This topic is empty.
Viewing 15 posts - 1 through 15 (of 16 total)
  • Author
    Posts
  • #67921 Reply
    pritam chatterjee
    Guest

    hi pix,bijoy

    how to counter jammer issue(jammer installed at jail).bts is generating alarm like mean holding time,excessive tch interfence .their is call muting,call craking,droping also.

    warm regards//
    pchatterjee

    #67922 Reply
    pix
    Guest

    the jammer is designed to destroy your gsm signal, you can’t do anything. if you want to improve your kpi, focus your cell coverage to other areas than the jail. In other words, re-azimuth your antenna to other directions.

    if you think the jamming device is creating problems outside the jail, then contact the jail IT and ask them to reduce the jammer power.

    #67923 Reply
    paraHO
    Guest

    pchatterjee

    Send an email to me for a discussion on how to handle your problem of jammer.

    paraho2003@yahoo.com

    #67924 Reply
    pix
    Guest

    hi paraho,

    why not here ?

    #67925 Reply
    Rex
    Guest

    Yes, why not here. I’m interested to know how to handle that problem.
    Regards,
    Rex

    #67926 Reply
    pritam
    Guest

    hi paraho,

    dropped the mail
    please check

    #67927 Reply
    paraHO
    Guest

    Hi pix, Rex

    Wanted more detail from pchatterjee before postng any reply. It is not clear country where jammer being used. Maybe only interference (may not mean jammer involved). If local government using jammer in jail what legal issues involved.

    How many Erlang forum members have problems with jammers?

    #67928 Reply
    Rex
    Guest

    Hi,
    We have jammer issue in a specific area. UL interference increased, we have a lot of samples in interference band 5. And what is interesting in this case, channels from 1 to 71 are interfered and from 72 and up are Ok (competitors frequencies). I didn’t hear about a jammer that can be tuned for specific range of frequencies. In that area there are some foreign offices, is it possible that metal detectors and various appliances can cause interference in UpLink for a specific range?
    Best regards,
    Rex

    #67929 Reply
    pix
    Guest

    hi rex,

    i looked at how gsm jammer works (and jammers in general) : they pollute the DL signal, not the UL.

    So if you see UL noise in your qos, it means it is probably another device. The best step now is to go around the area with your frequency scanner, measuring the UL band power. You will quickly localize the interferer.

    Why is it localised in your band only ? I don’t know. How did you measure that ?

    Regards
    pix

    #67930 Reply
    dinendran
    Guest

    hi pix

    i do have an issue with excessive tch interference with nsn bts near the secretariat.
    I have suspected jammer in that area. But i too have heard that jammer has influence in ul quality so that person near the jammer cant transmit without interference. More over jammer is easly designable for low freq ul than high freq dl signal
    expect ur response on this as im novice in this

    thanks
    dinendran

    #67931 Reply
    Rex
    Guest

    Hi Pix,
    we’ve tested channel by channel and from 72 to 124 there was no interference. Another indication that tells that interference is in UL is when we make a call we can hear the other party but they can’t hear us.
    Regards,
    Rex

    #67932 Reply
    paraHO
    Guest

    pchatterjee sent email back early March. You going to send email showing google maps reference for your masts and where the jail located where jammer sited. You never reply.

    #67933 Reply
    Lex
    Guest

    Hi Rex,
    Kindly check is there any repeater used in that area is malfunctioning.
    Let us know which make BTS you are using.

    #67934 Reply
    pix
    Guest

    hi,
    i was saying that jammers seem to be designed to transmit extra-noise in the DL band.
    A jammer would be seen in DL only, no in UL.

    (as far as i have seen !!!)

    UL interference can be seen by looking at indicators named “idle ts interference band” (approx.)

    DL quality can be quickly seen by doing a drivetest.

    Radio measurements collected by your optim tool shows the rx quality of your cell in each direction.

    Pix

    #67935 Reply
    paraHO
    Guest

    pix

    I agree with your identification re: DL interference. I set out a test for pchatterjee in my email and not seen any test results come back.

    If the email I sent of previously used and successful solutions work for pchatterjee then I will post them for everyone, but I had no response.

    br
    paraHO

Viewing 15 posts - 1 through 15 (of 16 total)
Reply To: Reply #67934 in jammer issue
Your information:




<a href="" title="" rel="" target=""> <blockquote cite=""> <code> <pre class=""> <em> <strong> <del datetime="" cite=""> <ins datetime="" cite=""> <ul> <ol start=""> <li> <img src="" border="" alt="" height="" width="">