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Antene Antene de toate tipurile, pentru internet wireless, satelitare si nu numai...


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Old 27.03.2010, 16:38   #41
valentin_florin
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Default Re: Hack antena comerciala-2,4Ghz-30db

acu imi merge netul cu antena pe care am facuto, problema era reflectorul, am pus niste aluminiu peste reflectorul plasa si se pare ca retine mai bine semnalul
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Old 20.04.2010, 17:47   #42
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Default Re: Hack antena comerciala-2,4Ghz-30db

In legatura cu aceasta antena.

M-am uitat la toate imaginile de pe http://www.zero13wireless.net/wirele...cional_24dBis/ si la una din cele artizanale LNB-ul este cu doua deflectoare plane paralele, la alta cu doar unul tip U, http://www.zero13wireless.net/wirele...ca_SD27_V3.jpg, dar pcb-ul pare tratat in locul unde ar trebui sa fie ce-l de-al doilea deflector (nu reflector). Desi nu am cunostinte de electronica doresc sa construiesc o antena din aceasta cu ansamblul cositorit pe o bucate de pcb.
Referitor la aceasta imagine, ce vrea sa ne zica cel care a construit-o? http://www.zero13wireless.net/wirele...ca_SD27_V3.jpg
Ca nu e nevoie de ultima portiune din pcb+deflectorul aferent?

Voi avea vreun avantaj in realizarea LNB-ului pe un pcb sau nu?


Multumesc
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Old 20.04.2010, 21:15   #43
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Default Re: Hack antena comerciala-2,4Ghz-30db

Dupa parerea mea nu vei avea avantaje daca folosesti circuit imprimat,din contra,se comporta ca un condensator.Fa totul in aer sau lipit cu plastic.
Eu folosesc doar cele doua elemente in unghi de 90 de grade si merge super,fara nimic altceva.
Cele doua tablite care sint obiectul discutiei tale sint folosite ca sa reflecte undele venite dinspre parabolica,inapoi spre elementul activ,dar eu personal am observat ca nu influenteaza,insa da este mai bine cu tabla aia indoita in forma de ,,U" care avind o suprafata mai mare,si trei unghiuri diferite da un cistig bunicel antenei.
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Old 20.04.2010, 22:55   #44
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Default Re: Hack antena comerciala-2,4Ghz-30db

Si cu acest castig potential, de ce distanta se poate vorbi?

Vreau sa mentionez ca vreau sa conectez antena printr-un N-female conector panou->pigtail N-MALE->cablu->RP-SMA male la un Alfa AWUS036H, deoarece nu ma atrage ideea de a-mi gauri carcasa laptop-ului.

Cat este gainul fata de un biquad sau dublu biquad? La modul practic ma intereseaza. Merita efortul?

Multumesc.
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Old 20.04.2010, 22:58   #45
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Default Re: Hack antena comerciala-2,4Ghz-30db

Daca nu faci greseli in constructie,diferenta este ca intre DACIA si MERCEDES...
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Old 21.04.2010, 00:43   #46
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Default Re: Hack antena comerciala-2,4Ghz-30db

Ai avut gain de 30db???

Legat de antene, am vazut pe http://traiect.ro/APP_shop/prodView.asp?idproduct=3492# un tip de antena care din specificatii nu-mi dau seama ce este la baza. Pare interesant ansamblul, desi pretul pentru un gain de 8db este prohibitiv.

edit: este antena tip "panel". Nu am prea vazut pe net 'home-made'.

---------- Post added at 23:45 ---------- Previous post was at 23:11 ----------

Un pdf interesant. DIY antenna+teorie.

http://www.wifi-toys.com/mo-wifitoys-chapter01.pdf

---------- Post added 21.04.2010 at 00:43 ---------- Previous post was 20.04.2010 at 23:45 ----------

Dintre aceasta antena si o biquad+parabola care zici ca e mai buna?
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Last edited by kukubau; 20.04.2010 at 23:49.
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Old 21.04.2010, 07:38   #47
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Default Re: Hack antena comerciala-2,4Ghz-30db

Nu stiu ce numesti gain,dar banuiesc ca te referi la cistigul antenei.
Masurat cu Netstumbler am avut si am 32 dbm.
Materialele de care vorbesti sint foarte interesante,din pacate nu le pot studia decit poate la sfirsit de saptamina.
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Old 21.04.2010, 09:00   #48
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Default Re: Hack antena comerciala-2,4Ghz-30db

Nu se prea vede bine din imagini cum sunt conectate placutele in L de cablu. Ma refer acolo unde este colierul. Este cumva lipita camasa metalica a cablului de cele 2 placute, sau e doar colierul strans peste camasa de plastic? (nu stiu care sunt termenii corecti ).

Sunt compatibile parabolele de satelit cu spectrul 2,4 ghz sau trebuie sa caut altceva?
Mersi.
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Old 21.04.2010, 15:35   #49
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Default Re: Hack antena comerciala-2,4Ghz-30db

Ambele placute sint cositorite intre ele si in acelasi timp cu camasa metalica a cablului.
Orice antena parabolica,lighean,tabla metalica,carton cu polei,etc este foarte bun pentru o antena de 2,4 ghz.
Bineinteles recomand parabolica metalica,cea de TV.
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Old 21.04.2010, 19:17   #50
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Default Re: Hack antena comerciala-2,4Ghz-30db

salutare ! interesant topic despre antene ! as dori sa va intreb cam cat m-ar costa sa imi fac una ca lumea? sa zicem sa prind semnal de la maxim 10 km m-ar interesa.daca va pricepti voi mai bine si aveti timp sa imi ziceti cu cat imi faceti una ! va multumesc !
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Old 21.04.2010, 21:15   #51
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Default Re: Hack antena comerciala-2,4Ghz-30db

Pai ai in aceasta sectiune tot ce ai nevoie, toate detaliile ca sa iti faci singur o antena, in functie de necesitati. Ai scheme cu dimensiuni exacte, ai scule, echipamente, materiale, sfaturi, tot ce vrei... trebuie doar sa citesti 2-3 topicuri... cateva pagini si deja ai raspunsul la toate intrebarile.

Succes!
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Old 22.04.2010, 03:19   #52
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Default Re: Hack antena comerciala-2,4Ghz-30db

@kittmask

Pentru un LMR 240 de 2,5 m nu cred ca sunt asa mari pierderi, nu?
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Old 22.04.2010, 12:45   #53
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Default Re: Hack antena comerciala-2,4Ghz-30db

Doar 1.06dB.....



Cand castigi mai multi si ai de unde lasa rezonabil, e decent asa.
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Old 22.04.2010, 14:54   #54
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Default Re: Hack antena comerciala-2,4Ghz-30db

eu nu am gasit in oras cablu LMR , dar in schimb am gasit un H 155 , merge mult mai bine decat cel de televizor pe care il foloseam eu, e mai subtire si mai usor de manevrat ,si costa doar 2,3 roni metrul.....eu folosesc unul de 6 metri si merge mai bine ca niciodata
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Old 22.04.2010, 22:27   #55
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Default Re: Hack antena comerciala-2,4Ghz-30db

Quote:
Originally Posted by kukubau View Post
@kittmask

Pentru un LMR 240 de 2,5 m nu cred ca sunt asa mari pierderi, nu?
Teoretic nu,dar mai bine probeaza ca iti dai sema mai bine.LMR-ul tau nu este ca al meu de aici,si pot fi diferente foarte mari.
Lasa teoriile mai tirziu,si fa probe practice ca vei avea rezultate foarte bune.Noi de obicei vorbim despre ce cunoastem,adica despre chestii cu care am facute practica,si banuim ca restul este mai rau sau mai bun in functie de ce spune prospectul,dar realitatea poate fi asa de diferita,ca uneori ne lasa si pe noi in ridicul.
Si nu uitati.....,,pe afara'i vopsit gardul,inauntru leopardul"
..proba practica,experienta voastra personala este mai pretioasa ca teoria mea,sau a altuia.
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Old 23.04.2010, 18:06   #56
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Default Re: Hack antena comerciala-2,4Ghz-30db

Cand ma gandesc ca am de lipit si la cat de prost lipesc nu va merge, imi vine sa iau una gata facuta.
http://www.traiect.ro/APP_shop/prodV...?idProduct=130

---------- Post added at 18:06 ---------- Previous post was at 17:48 ----------

Quote:
Originally Posted by valentin_florin View Post
eu nu am gasit in oras cablu LMR , dar in schimb am gasit un H 155 , merge mult mai bine decat cel de televizor pe care il foloseam eu, e mai subtire si mai usor de manevrat ,si costa doar 2,3 roni metrul.....eu folosesc unul de 6 metri si merge mai bine ca niciodata
Coaxu de televizor e contraindicat din start pt transmisii wireless. Ma mir ca ti-a si mers.
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Old 23.04.2010, 18:24   #57
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Default Re: Hack antena comerciala-2,4Ghz-30db

nu mi-a mers foarte bine cu orice antena , belgrano a functionat la mine foarte bine cu un cablu tv de 5 metri si fara parabolica, incearca sa o faci si tu, e simpla, tabla de cupru nu am gasit dar se poate face si din teava de cupru o tai la vreo 7 cm si o despici cu bomfaerul, dupa acea o bati cu ciocanul pana e dreapta
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Old 23.04.2010, 19:04   #58
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Quote:
Originally Posted by valentin_florin View Post
nu mi-a mers foarte bine cu orice antena , belgrano a functionat la mine foarte bine cu un cablu tv de 5 metri si fara parabolica, incearca sa o faci si tu, e simpla, tabla de cupru nu am gasit dar se poate face si din teava de cupru o tai la vreo 7 cm si o despici cu bomfaerul, dupa acea o bati cu ciocanul pana e dreapta
Nu prea-mi place cum arata Mai degraba fac asta de 24 dbi ca am deja parabola si cablul sertizat profi. Sau fac un biquad.
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Old 23.04.2010, 20:15   #59
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Default Re: Hack antena comerciala-2,4Ghz-30db

mie mi se pare cea mai buna belgrano, si eu folosesc un biguad 9 dar mia mi se pare fragila, putin ) fara parabolica si merge super mai bine decat , antena hack comerciala, .....acum depinde probabil de cum ii iasa fiecaruia
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Old 25.04.2010, 20:12   #60
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Default Re: Hack antena comerciala-2,4Ghz-30db

Ce parere aveti de aceasta antena, pt un castig de 20.5 dbi?

http://www.traiect.ro/APP_shop/prodV...?idProduct=130
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