RF transceiver - Page 1
Forum section: electronics / projects

author: mr.San
author_rank: Newbie
timestamp: April 19, 2011, 05:20:03 am
content: 'm working on a rf project.Could any one suggest me an RF transceiver (may even Point to Point or an multipoint) but should 've an area coverage of 5000 mts (5 kilometers).....RegardsSans

author: tnt
author_rank: Regular Contributor
timestamp: April 19, 2011, 10:13:29 am
content: 5km is quite a lot ... and your description is a bit short.* Is it on flat open terrain ? Or 5 km in a huge underground bunker ?* Any frequency band requirement (legal restrictions in your country) ?* What kind of data ? Voice / Digital / Analog stuff ? What bandwidth/bitrate ?* Power supply available ?* Size ? Antenna size ?...

author: mr.San
author_rank: Newbie
timestamp: April 19, 2011, 07:20:24 pm
content: Sorry dude 'm new to this kindda of forums ('d be appropriate to tell for the internet either).Comin to the point.It is in open terrain / Frequncy band similar to that of any gsm carriersType of data : Digitalbandwidth / bitrate : 'm not surepower supply : very min power supplySize : Yet to decide ()

author: bilko
author_rank: Frequent Contributor
timestamp: April 19, 2011, 07:38:35 pm
content: This is poor spec, but here's a start. Wifi with parabolic antenna.

author: mr.San
author_rank: Newbie
timestamp: April 22, 2011, 06:15:38 pm
content: Quote from: yachtronics on April 19, 2011, 07:38:35 pmdude thn can help wat are the things to be done for accurate specifications ?

author: bilko
author_rank: Frequent Contributor
timestamp: April 22, 2011, 06:49:03 pm
content: You've answered some already,Bitrate / bandwidth would be useful. Are you sending a few bytes or streaming video for example ?Do you have line of sight ?Point to point or network / mesh ?Fixed or mobile installation ?There are many bands available and 5km is easy achievable with the correct antenna

author: mr.San
author_rank: Newbie
timestamp: April 22, 2011, 06:58:04 pm
content: 'm wannin to send 48 kb encrypted datano i don 've line of sight hence 'm thinkin of RFFixed intallation with mesh n/w's

author: bilko
author_rank: Frequent Contributor
timestamp: April 22, 2011, 07:12:43 pm
content: Open terrain ? but not line of sight.What obstacles do you have in the way ?trees / buildings.Do you have a topography map, you can use google earth to get details of elevations and obstacles, bear in mind that the data may be a few years old so if new buildings have been constructed you will have to take this into account

author: mr.San
author_rank: Newbie
timestamp: April 22, 2011, 07:31:11 pm
content: Quote from: yachtronics on April 22, 2011, 07:12:43 pmYaaaa its not completey open terrain coz its a deep outskirts of city. 've obstacles like trees buildings even wind . .Also antenna height matters as i need a compact one - hence i belive that no Line Of Sight 'd be obtained

author: philbx1
author_rank: Regular Contributor
timestamp: April 24, 2011, 11:02:20 am
content: Maybe one of these?From memory I think they have a transceiver that does 4500 metres.Maybe with mini yagi antennas...http://en.51sunray.com/products_list/&pmcId=3ebbe63b-196a-43d2-88e5-45f82d637c8d&comp_stats=comp-FrontProductsCategory_show01-1276239712152.html

author: Psi
author_rank: Super Contributor
timestamp: April 24, 2011, 11:55:07 am
content: 1Watt at 900mhz, up to 40miles in open area with high gain antennahttp://www.sparkfun.com/products/9411They have some other lower power ones too that might be suitablehttp://www.sparkfun.com/products/9087downside is i'm pretty sure they're illegal in AUS/NZ due to their frequency band

author: mr.San
author_rank: Newbie
timestamp: May 10, 2011, 02:21:35 pm
content: @ above allthanks guys you 've really given me up a gr8 ways. . 'm workin on it ............ hope 'll achieve it in a short while..