- This topic has 7 replies, 1 voice, and was last updated 5 years, 3 months ago by ASHUTOSH CHANDA.
29th September 2006 at 08:47 #45875dayanidhiGuest
i have one problem i am using Nokia double cabinet in ultrasite bts now i am getting one alarm rx level is in between main and diversity
A.S.ayanidhi29th September 2006 at 17:52 #45876SachinGuest
Try undertaking power checks of the sector. Many a times the reverse power in one of the TRX path causes the alarm, carry out checks at BTS top and antenna entry end.30th September 2006 at 08:30 #45877daynidhiGuest
dear sachin thank you sir3rd October 2006 at 15:37 #45878patrickGuest
when you make a commissioning of ultrasite there is a check of antenna.
When alarm “rx level is between main and div” there is a problem on the main or div.
In begin, find RSSI COMPARAISON VALUE menu in ULTRASITE manager.
In colonne DIFFERENCE, if you have more than 4 or 5, you have a ross problem. => reason why alarm “rx difference…” coming.
You can also test TRX => TRX test, you have test of main and div.6th October 2006 at 01:52 #45879Josh T-MGuest
All that this alarm is saying is that you have a difference between you main and diversity anttena lines. I have 5 years experience with Ultrasites and Talkfamily before that. The alarm parameter is set in your BSC so make sure that the parameter is not set to low usually less than 10dB of difference is acceptable.
Next if this parameter is set correctly go to your BTS and complete a return loss system sweep and make sure that your two lines that you are recieving on are passing to your spec on the uplink path. If they and you are using a tower mounted amplifier(TMA/LNA) make sure that it has the correct amp draw. One of these should more than likely be your problem. If not you may also check that all of the cableing inside your cabinet is correct and tight.28th February 2012 at 19:11 #45880Zahid KhanGuest
Halo every1, multicopler performs signal splitting for both main and diversity signal. I dont get it, how this task is handled by multicpler????1st March 2012 at 18:17 #45881NAGuest
Multicoupler is just a simple passive component. and just working as frequency splitter or think it is a filter, thats it.
thanks27th January 2016 at 05:33 #45882ASHUTOSH CHANDAGuest
ALARM COMING THAT IS RX LEVEL DIFFERENCE BETWEEN MAIN AND DIVERSITY ANTENNA, ACTUALLY VSWR IS 1.26 IN MAIN AND IN DIVERSITY 1.32 BUT STILL ALARM IS COMING I SWAPPED THE TRX DUPLEXER AND ALL THE EQUIPMENT IN THE SECTOR EXCEPT GSM ANTENNA BUT STILL ALARM IS COMING I WANT TO KNOW WHY THE ALARM IS COMING