- This topic has 3 replies, 1 voice, and was last updated 14 years, 10 months ago by
.
-
Posts
-
hello everyone i am working as a transmission engineer for a gsm company
recently we have a new link between 2 sites and the information are just like bellow
1-antenna size:2.4 m
2-radio type RAU2 7 GHz
3-indoor equipment are MMU 155 e/f by ericsson
protection mode 1+1
i have LTU 155 Mbps
and NPU unit
i have checked that there is no movement in the dish antenna on the two sites why should the Dbm is flactuating if there is no interference ????? plz help with the possible cases of signal unstabilityHi,
Apart from HW issues, you can check
1- are both rx sides getting fluctuations ?
2- the polarity of both antennas ? same ?
3- changing frequencies to see if you are not facing a kind of phase cancellation due to an obstacle around the path..i’m not an expert here, just sharing some thoughts
cheers
-pixthanx for your response pix , here i have to explain it more clearly
first i am sending 2 links by the same antenna I.E i have 2 polaritis V and H with different frequencies, the second thing is i am using XPIC option cuz i have 8 MMUs in the site and 1+1 protection plus XPIC
pos2,pos3 are V,,pos4,pos5 are H
on the other side of the equipment i have pos 14,15 H and 16,17 Hdavid,
sorry, this is too high level for me… let’s hope someone else can help you out !
pix
- The forum ‘Telecom Design’ is closed to new topics and replies.
