Generic selectors
Exact matches only
Search in title
Search in content
Search in posts
Search in pages

RBS900 with high 1800Mhz harmonics

Viewing 4 posts - 1 through 4 (of 4 total)
  • Author
    Posts
  • #63870 Reply
    Suzi
    Guest

    hi
    Anyone have similar issue in ericson RBS? Some sites 900Mhz have strong 1800/1900Mhz harmonics, causing interference to other 1800 cells. TRX were checked but it is not. maybe antenna?
    thanks for help

    #63871 Reply
    pix
    Guest

    hi suzi,

    you can precisely compute the 1800MHz harmonics. what are your ARFCN of the 900MHz sector?

    this happens when the DL frequencies of 2 TRX (or more) of the same sector are combined on the same antenna.

    f1(DL) + f2(DL) = 1800 MHz frequency (UL or DL)
    The most dangerous harmonic is one which falls within the UL band. Because even a weak signal will probably interfere strongly with the UL from the MS.

    to avoid intermodulation in the 900 site, you should avoid combining the Tx signal. in other words, bypass your combiner or find a way to avoid combining these 2 freq together.
    another solution : change your 900MHz frequencies so that the harmonics are far away from your 1800MHz band.

    regards
    pix

    #63872 Reply
    Suzi
    Guest

    Thanks a lot for the idea.
    I will check our configuration if it falls under the case you described.
    Thanks again.

    #63873 Reply
    kishore
    Guest

    Hi, What is the range of strong harmonics in 1800band. I’m getting the -40dBm exactly at 10Mhz away from radiating frequency. What might be the reason, plz help.

Viewing 4 posts - 1 through 4 (of 4 total)
Reply To: RBS900 with high 1800Mhz harmonics
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="">