- This topic has 8 replies, 1 voice, and was last updated 13 years, 10 months ago by Ahmad.
6th November 2005 at 16:54 #42848khurramGuest
what are the parameters to design radio link.How we estimate the propagation path loss.what is shadow fading.7th November 2005 at 11:50 #42849paryGuest
1)Under the link budget formulla:
path loss= TX power + all gain in link – all loss in link – RX sensitivity.
2)the shadow fading yielded by the building or other obstacles in propagation environment & its distrubuted as log normal.
Thus if the path loss made global mean slope. the variation in this slope up & down called as local mean or log normal fading(shadow fading).
shadow fading differ from urban to suburban to rural as the obstacles cosentration changed.2nd July 2006 at 06:36 #42850Shamsul Haque RubelGuest
In pathloss program,why we use Geo clamatic factor?2nd July 2006 at 06:55 #42851Shamsul Haque RubelGuest
In planning we use vertical & horizontal polarization.please tell me when we’ll use vertical & horizontal polarization?8th July 2006 at 00:30 #42852PixGuest
geo climatic factor ? i know the rain can have a serious influence on the radio propagation (up to 3 to 6 dB), so it is smart to take in to account the “average amount of rain drop in the country” for your pathloss computation.
Vertical / Horizontal diversity :
horizontal is more efficient (less separation distance needed for the same amount of Rx Gain), but sometimes the antenna support cannot stand horizontal separation mounting. Therefore, in such cases, you have to use V-diversity.10th July 2006 at 06:46 #42853ArminGuest
Can you tell me more about X & V pole antenna?
also about manimum distance between high voltage power line and GSM antenna?
Also if possible please give me your mail.26th January 2007 at 09:11 #42854AccentGuest
I am working with operator which using majority GSM1800 Band. Lately we got GSM900 band but I have very limited knowledge about 900 band propagation characteristic.
I would like to ask what are the recommanded Penetration loss for 900 band for:
1) Dense Urban indoor
2) Urban indoor
3) Suburban indoor
4) Rural/In car
2ndly, can I assume that Fading Margin for 1800 band and 900 band are the same?
Thank you20th April 2007 at 09:48 #42855AshishGuest
Is any distance criteria in planning MW network with Horizontal polarisation in 15 Gc band. Practicallly what hop length we can use for SDH system?23rd April 2007 at 12:46 #42856AhmadGuest
Can anybody tell me how can i design mw link between two sites using path loss program, i mean the planning …