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Post subject: kolko dB ma "plechovkova" antena ?
 Posted: 15.05.2003 - 18:40 #1865
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Basic
Joined: Apr 28, 2003
Posts: 117
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| Zdravim, zaujima ma kolko dB ma plechovkova antena a este ako sa to vlastne preratava na dosiahnutelnu vzdialenost. Ked chcem na 2km plechovku tak na tduhej strane musi byt kolko dB ? |
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Post subject: RE: kolko dB ma "plechovkova" antena ?
Posted: 16.05.2003 - 00:24 #1870
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Majster
Joined: Jan 12, 2003
Posts: 4250
Location: /dev/null
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| Pri vyrobe plechovkovej anteny mas na vstupe tolko bulharskych konstat ze si to cislo mozes vycucnut z prsta alebo si ju mozes skusit nechat zmerat... |
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Post subject: RE: kolko dB ma "plechovkova" antena ?
Posted: 16.05.2003 - 10:16 #1877
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Basic
Joined: Apr 28, 2003
Posts: 117
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| Tak ale na aku vzdialenost sa to da s nimi dosiahnut ? To nikto neskusal ? |
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Post subject: RE: kolko dB ma "plechovkova" antena ?
Posted: 16.05.2003 - 15:43 #1880
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Majster
Joined: Jan 12, 2003
Posts: 4250
Location: /dev/null
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| Pozri, aj ked ty sam spravis 2 plechovky z rovnakych vstupnych surovin, urcite nebudu uplne rovnake.. ked to budu robit 2ja rozny ludia a budu mat este rozne vstupne suroviny (priemer plechovky, hlbka, ...) tak parametre vysledku budu asi dost odlisne... a vzdialenost... to ti tam vstupuju dalsie bulharske konstanty ako napriklad zarusenost prostredia, viditelnost/utlm a pod... vyroba plechovky vsak nejde velmi do penazi, tak to mozes skusit a ked ti to pojde blbo alebo nepojde, mozes si kupit uz hotovu antenu... |
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Post subject: RE: kolko dB ma "plechovkova" antena ?
Posted: 16.05.2003 - 21:09 #1882
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Basic
Joined: Máj 15, 2003
Posts: 161
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| pri pouziti slovenskych konstant dosieahnes s plechovkou okolo 10-13dB. ak chces dodrzat limity, tak na 2km ti uz treba 24dB anteny (idealne sito)... |
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Post subject: RE: kolko dB ma "plechovkova" antena ?
Posted: 16.05.2003 - 21:22 #1884
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Majster
Joined: Jan 12, 2003
Posts: 4250
Location: /dev/null
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| s parom 24 dBi anten v nezarusenom prostredi bezproblemov prekrocis aj hranicu 10 km, na 2 km ti musi zarucene stacit aj 17 al. 19 dBi... (zalezi vsak aj na sile radia a tom ako to mas spravene, ked mas medzi antenou a radiom mrte kabla tak potom ti mozno nebude stacit ani ta 24 dBi antena...) |
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Post subject: RE: kolko dB ma "plechovkova" antena ?
Posted: 11.06.2003 - 17:44 #2394
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Basic
Joined: Apr 28, 2003
Posts: 117
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Ja to chcem prevadzkovat na pripojenie na vsesmerovku v nezarusenom dedinskom prostredi. Tak sa spytam z 2 strany - aku vsesmerovku k plechovke na 2km na dedine ?
Sleyo |
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Post subject: RE: kolko dB ma "plechovkova" antena ?
Posted: 11.06.2003 - 17:49 #2396
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Guru
Joined: Feb 19, 2003
Posts: 1133
Location: blizko Trencina
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cim viac, tym lepsie .. hlavne nepresvyhnut povolenie  )
ja mam 10.5dB H ale neskusal som na viac ako 700m
ak das 15dB, tak nemas problem (rozdiel je len 6dB medzi 1 a 2km) |
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Post subject: RE: kolko dB ma "plechovkova" antena ?
Posted: 11.06.2003 - 19:48 #2400
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Guru
Joined: Dec 27, 2002
Posts: 1505
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urcite by som nepouzival plechovku. SQUAD antena ma mensie rozmery, je omnoho jednoduchssia na vyrobu a zisk je tiez okolo 10db. oproti dedinskej vsesmerovke v pohode.
Skfree 8.5 fakci max na 4 km, ale oproti uz je 24CSATka
Na interne antenky tak do 300-400m, na SQUADY tak 2km. |
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Post subject: RE: kolko dB ma "plechovkova" antena ?
Posted: 12.06.2003 - 10:15 #2413
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Basic
Joined: Apr 28, 2003
Posts: 117
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aka je to SQUAD antena ? - mate daky overeny navod ? Nech to da 11Mbit oproti tej SKOMNI85 na 2KM...
Dik vam.
Sleyo |
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Post subject: RE: kolko dB ma "plechovkova" antena ?
Posted: 12.06.2003 - 12:52 #2419
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Basic
Joined: Mar 18, 2003
Posts: 117
Location: Šamorín, BA
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Post subject: RE: kolko dB ma "plechovkova" antena ?
Posted: 24.06.2003 - 00:38 #2533
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Ucen
Joined: Jún 24, 2003
Posts: 598
Location: /dev/null
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Squad je v pohode je mala a ma pomaly lepsie parametry ako moja 19db sito. Inak za tie naklady asi lepšie nic nie je.
Nejake NFO najdeš aj na : www.czfree.net |
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Post subject: RE: kolko dB ma "plechovkova" antena ?
Posted: 30.10.2003 - 12:59 #4397
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Basic
Joined: Okt 24, 2003
Posts: 6
Location: Pezinok - Muškát
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na tejto stranke [url]http://www.nodomainname.co.uk/Antennas/antenna.htm#Can with conical horn[/url] je zaujimavy "upgrade" plechovky o lievik.. a vyzera ze aj dost zlepsujuci parametre  |
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Post subject: RE: kolko dB ma "plechovkova" antena ?
Posted: 30.10.2003 - 22:36 #4406
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Basic
Joined: Mar 08, 2003
Posts: 113
Location: Michalovce
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| To s tym lievikom je podla mna dost velka blbost. Niekde si to chvalia, inde zas zatracuju. Ja som to neskusal, ale nepozdava sa mi to aj z dovodu, ze sa to bude dost blbo pripevnovat aby medzi lievikom a plechovkou nezostala ziadna hrana. |
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Post subject: RE: kolko dB ma "plechovkova" antena ?
Posted: 18.11.2003 - 10:24 #4649
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Majster
Joined: Okt 22, 2003
Posts: 3322
Location: Banská Bystrica - Rudlová
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| Takze pripajam sa k chvalam anteny typu quad, myslim si ze je to lepsie riesenie ako plechovka, mne osobne tie plechovky nejako nechcu ist, ale kvady idu naozaj perfektne ci uz BIQUAD alebo SQUAD {dvojity biquad...cize stvority quad } |
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