Outline · [ Standard ] · Linear+ ajutor cu un televizor, e vreun electronist pe aici...?

Apropo de puterea semnalului uaifii, pentru spartfoanele cu androizi exista o aplicatie foarte haioasa, Wifi Analyzer. Detecteaza toate uifiurile din zona si îti afiseaza puterea fiecaruia, plus alte chestii. Te plimbi cu spartfonu' prin casa/pe balcon/prin curte/prin vecini si vezi exact cum sta treaba sin pacate transmisiunile satelit si Wireless-ul lucreaza la frecvente asemanatoare in jur de 2Ghz Si nu numai, mai sunt si alte gadgeturi gen telefoane cordless. De-aia exista si posibilitatea de alegere manuala a channel-ului (de fapt, a frecventei) la rutarele cu uaifii. Am un amic care era disperat ca-i pica conexiunea wifi din casa, într-un mod absolut aleator. Netul de la provider era ok, în sensul ca pe cablu nu pica nimic. Dupa ce a frecat rutaru' de l-a încins, ma suna disperat pentru un sfat, o idee. Il întreb daca se întampla si altceva prin casa, atunci cand ramanea fara wifi? Zice ca nu, ca nu-si da seama. Dupa vreo saptamana a descoperit ca-i pica uairlesu' atunci cand nevasta vorbea la cordless L-a trecut manual pe un anumit canal (implicit astea vin setate pe Auto) si si-a rezolvat problema. This post has been edited by Markos: 23 Aug 2011, 19:19

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Apropo de puterea semnalului uaifii, pentru spartfoanele cu androizi exista o aplicatie foarte haioasa, Wifi Analyzer. Detecteaza toate uifiurile din zona si îti afiseaza puterea fiecaruia, plus alte chestii.

Te plimbi cu spartfonu' prin casa/pe balcon/prin curte/prin vecini si vezi exact cum sta treaba

sin pacate transmisiunile satelit si Wireless-ul lucreaza la frecvente asemanatoare in jur de 2Ghz

Si nu numai, mai sunt si alte gadgeturi gen telefoane cordless. De-aia exista si posibilitatea de alegere manuala a channel-ului (de fapt, a frecventei) la rutarele cu uaifii.

Am un amic care era disperat ca-i pica conexiunea wifi din casa, într-un mod absolut aleator. Netul de la provider era ok, în sensul ca pe cablu nu pica nimic. Dupa ce a frecat rutaru' de l-a încins, ma suna disperat pentru un sfat, o idee. Il întreb daca se întampla si altceva prin casa, atunci cand ramanea fara wifi? Zice ca nu, ca nu-si da seama. Dupa vreo saptamana a descoperit ca-i pica uairlesu' atunci cand nevasta vorbea la cordless L-a trecut manual pe un anumit canal (implicit astea vin setate pe Auto) si si-a rezolvat problema.

This post has been edited by Markos: 23 Aug 2011, 19:19

Uiti brie un moldovian deshtept.

Unde? Unde?

In Europe the frequencies used by DBS services are 10.7–12.75 GHz on two polarisations H (Horizontal) and V (Vertical). This range is divided into a "low band" with 10.7–11.7 GHz, and a "high band" with 11.7–12.75 GHz. This results in two frequency bands, each with a bandwidth of about 1 GHz, each with two possible polarizations. In the LNB they become down converted to 950–2150 MHz, which is the frequency range allocated for the satellite service on the coaxial cable between LNBF and receiver. Lower frequencies are allocated to cable and terrestrial TV, FM radio, etc. Only one of these frequency bands fits on the coaxial cable, so each of these bands needs a separate cable from the LNBF to a switching matrix or the receiver needs to select one of the 4 possibilities at a time

Interference
For more details on this topic, see Electromagnetic interference at 2.4 GHz.

Wi-Fi connections can be disrupted or the internet speed lowered by having other devices in the same area. Many 2.4 GHz 802.11b and 802.11g access-points default to the same channel on initial startup, contributing to congestion on certain channels. Wi-Fi pollution, or an excessive number of access points in the area, especially on the neighboring channel, can prevent access and interfere with other devices' use of other access points, caused by overlapping channels in the 802.11g/b spectrum, as well as with decreased signal-to-noise ratio (SNR) between access points. This can become a problem in high-density areas, such as large apartment complexes or office buildings with many Wi-Fi access points.

Additionally, other devices use the 2.4 GHz band: microwave ovens, ISM band devices, security cameras, ZigBee devices, Bluetooth devices and (in some countries) Amateur radio, video senders, cordless phones and baby monitors, all of which can cause significant additional interference. It is also an issue when municipalities[35] or other large entities (such as universities) seek to provide large area coverage.

http://en.wikipedia.org/wiki/Wi-Fi

http://en.wikipedia.org/wiki/Satellite_dish

Si despre telefoane, se pare ca doar alea de State merg in 2.4:

Some DECT properties:[citation needed]

Audio codec: G.726, G.711, G.722 (wideband), G.729.1 (wideband) and MPEG-4 ER LD AAC (wideband and super-wideband)
Net bit rate: 32 kbit/s
Frequency: 1880 MHz–1900 MHz in Europe, 1900 MHz-1920 MHz in China,　1893 MHz–1906 MHz in Japan, 1910 MHz-1930 MHz in Latin America and 1920 MHz–1930 MHz in the US and Canada, US DECT and DECT 6 products may NOT be used in the UK as they cause and suffer from interference with the UK 3G cellular networks with unlicensed use of such products being prohibited by UK agencies. As DECT and DECT 6.0 do not operate in the 2.4 GHz ISM band, they are not subject to the interference arising in this band from its use by 802.11b and 802.11g WiFi, and 2.4 GHz cordless phones.
Carriers: 10 (1,728 kHz spacing) in Europe, 5 (1,728 kHz spacing) in the US
Time slots: 2 x 12 (up and down stream)
Channel allocation: dynamic
Average transmission power: 10 mW (250 mW peak) in Europe, 4 mW (100 mW peak) in the US

http://en.wikipedia.org/wiki/Digital_Enhan...ecommunications


Imbunatatirea semnalului wireless:

http://www.microsoft.com/athome/setup/wirelesstips.aspx




This post has been edited by fnp: 25 Aug 2011, 10:30

Apropo de puterea semnalului uaifii, pentru spartfoanele cu androizi exista o aplicatie foarte haioasa, Wifi Analyzer. Detecteaza toate uifiurile din zona si îti afiseaza puterea fiecaruia, plus alte chestii.

Te plimbi cu spartfonu' prin casa/pe balcon/prin curte/prin vecini si vezi exact cum sta treaba 

Io am numai N79 fara androizi ,steroizi si are din fabrica bozgoreasca aiasta fonctie de a afisa lista uaifi , puterea semnalului ,daca e free sau nu, care e mama lui,etc.
Asa ma conectez la scarbici pe ruteru din vecini.

Stiu, bade, ca am avut si eu N78.

Il am si acum, la cutie, cumpara careva?


(vreau sa strang bani pentru echipa)

This post has been edited by Markos: 25 Aug 2011, 19:10

Daca in cutie e un N701 il iau io

This post has been edited by bion: 25 Aug 2011, 19:20