Broadband almost as Rural as it gets.... (UK)

dieselfreak

http://www.adslguide.org/newsarchive.asp?item=1994

Well this is more of whats required in Ireland.

Enterprise, local Government and the Regulator actually working together to get fantastic results in the most rural places in the UK

Upto 12Mbits/Sec tested, and the regulator allowing 5.8Ghz power to be Doubled !!

:cool:

bminish

dieselfreak wrote:

http://www.adslguide.org/newsarchive.asp?item=1994
... and the regulator allowing 5.8Ghz power to be Doubled !!
:cool:

Not sure what the UK limit on 5.8 is but here it is a reasonable 2w EIRP. You can actually do a lot on 5.8 Ghz with 2 W EIRP.

A doubling of power is a 3 dB increase so it's actually not all that useful in most cases but it's good to see a regulator being flexible..

.Brendan

Mr_Man

Any ideas what kind of range you'll get from 2w at 5.8Ghz ? Is it true that Comreg are limiting the range on this spectrum to 5 miles ?

Thanks

M.

Urban Weigl

Mr_Man wrote:

Any ideas what kind of range you'll get from 2w at 5.8Ghz ? Is it true that Comreg are limiting the range on this spectrum to 5 miles?

There is no such limit in place. Perhaps you were thinking about the 3.5 GHz licenses?

Regarding distance, it all depends on the kind of equipment used, the terrain, the kind of speeds you want to get along with other factors. That being said, with good line of sight and a free freznel zone, you should be able to set up a point to point link over a distance of 20+ miles staying within the limits. The key at 5.8 GHz really is line of sight. Once you have that, and assuming there aren't any other issues in the deployment, it should work.

Mr_Man

Urban

thanks for the reply, you mentioned 20+ miles for point to point, what would be an effective range for a BB transmitter operating at this frequency ?

Thanks
M.

bminish

Mr_Man wrote:

Urban

thanks for the reply, you mentioned 20+ miles for point to point, what would be an effective range for a BB transmitter operating at this frequency ?

Thanks
M.

Hmm, How long is a piece of string!
2W EIRP is a very useful power level on 5.8 Ghz (thanks Comreg! )

Some back of envelope calculations
'ISP' using 15.5 dBi Sectorials and putting the transmitter close to the antenna
Users using 23 dBi mesh grid antenna( 510 mm by 510mm so not too big), CPE located at antenna with POE
Cable & connector loss (both ends) 1 dB per end

We will call a signal better than -70dBm very useable (need some fade margin & weaker signals mean lower thoughput

Works out at about 8Km

If we use a bigger antenna at the user end (27.5dBi) (760mm by 760mm ) we can go to 13 Km for -70dBm and at 35 Km we would be down to -79 dBm (weaker but still usable, although the fade margin is a bit tight for such a long link )

My own link outta here (I am finally rid of the VSAT setup) has one hop on 5.8 Ghz (802.11a) and one on 2.4 Ghz (802.11b ) The 802.11a link isn't a very clear shot (stuff in the the Fresnel zone and the tops of some trees ) with 2x 23 dBi antennas and CM9 radios I have a link over about 8Km that is holding a steady -81 dB and mostly running at 24 Mbs (probably more like 12Mbs tcp/ip throughput ) At the Moment the antenna on the hill is clamped on the end of a shovel stuck in the ground, when it goes up the mast on monday I expect things will improve slightly

.Brendan

Mr_Man

Bredan,

thanks for the info, very useful

Cheers
M.