Balun
Balunid on teatud tüüpi elektrilised trahvod, mis konverdivad elektrilisi signaale, mis on tasakaalus maaga signaalideks mis on tasakaalustamata ja vastupidi. Sageli kasutatakse neid ka mitme kaabli ühenduseks mille takistus on erinev. Sõna balun on ise tuletatud sõnadest: bal(ance) + un(balance).
http://www.njqrp.org/balun/Picture%206%20-%20Completed%202-core%20Balun-%28640%29.jpg
Info
Up to 300 watts use an Amidon T130-6 at higher power up to 1KW an Amidon T200-6. rusika reegel: 1 ruutsentimeeter - kestab ca 1kW - ES4RC
Balun 9:1
The 9:1 transformer provides: 1. a much flatter broadband impedance response, 2. a static elctricity-free antenna system (no buildup), 3. common mode noise immunity (if space wound as shown).
Toroid T200-6 - Yellow - 1-50MHz - 8.50 €
Mõõdud: Välimine: Outside Diameter (OD) 2.0" (50.8mm) Sisemine: Inside Diameter (ID) 1.25" (31.8mm) Kõrgus : Height (Ht) 0.55" (14.0mm) Kaal : Weight (Wt) 125g
Ferrite toroid FT50-43 1-50MHz. type 43 - as used in many QRP circuits, interference suppression, etc.
Välimine : ø 12.7 mm Sisemine : ø 7.1 mm Kõrgus : 4.8 mm
Erinevad lahendused
- http://www.m0ukd.com/Magnetic_Long_Wire_UnUn/index.php - Balun 9:1 - 250 KHz-10 MHz - Torroid T130-2 - 450 ohm to 50 ohm.
- http://www.hard-core-dx.com/nordicdx/antenna/feed/9_1balun.html - Balun 9:1 - FT50-43 1-50MHz. type 43
- http://www.scanningtasmania.org/9-1balun.html
- http://www.ea4frb.eu/antenna_projects.html#UNUN91 - Balun 9:1 - FT-240-61 ferrite toroid (an iron powder T200-2 is ok too - Magnetic Longwire Balun
- http://www.i1wqrlinkradio.com/category/proj/Short_beverage/balun%209a1.html
- http://www.df7rg.de/produkte/unun/index.htm
- http://dl3cq.de/bulo/index.php?option=com_content&view=article&id=81&Itemid=76 - CB antenn lühilaine antenniks.
- http://www.qslnet.de/member/dc3rj/cb+magnetic_unun/CB%20zu%20AFU.pdf
- http://www.qslnet.de/member/dc3rj/cb+magnetic_unun/index.htm - - CB antenn lühilaineantenniks.
- http://www.pcsystems-ss.co.uk/g7lrrweb/index.php?module=pagemaster&PAGE_user_op=view_page&PAGE_id=52&MMN_position=77:37 - 4:1 balun - Toroid T 200-2 ( 0-30 MHz ) or T 200-6 ( up to 50 MHz )