transmission This topic has 2 replies, 1 voice, and was last updated 16 years, 1 month ago by wali. Viewing 3 posts - 1 through 3 (of 3 total) Author Posts 1st August 2007 at 08:36 #48499 Aminul IslamGuest sir, what is the means of idu? why we use microwave & gsm antena? 1st August 2007 at 16:31 #48500 PixGuest Antennas are the only way (as far as i know) to convert an electric current into electromagnetic waves, that can go through air. 4th August 2007 at 11:42 #48501 waliGuest Amin idu is the basic systes units use in indoor cabinet. microwave is a cheap source of transmission media from one tower to another. gsm antenna we are using for gsm mobile coverage. Author Posts Viewing 3 posts - 1 through 3 (of 3 total) The forum ‘Telecom Design’ is closed to new topics and replies.