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VHF Broadband balun 4 to 1 ratio..(50 and 144 mhz)..maybe even up to 440? how to build one?
Id like to build a 4 to 1 balun..50 mhz through 2mtrs (and above if
possible). I have ferrite cores..type 61 and 37 material. Does anyone know how to build a low loss 4 to 1 VHF balun.? I was thinking of taking 2..nr 37 big sleeve beads and making a binocular type of core and winding a broadband xformer..and wind the coax into a choke ahead of it. Question..is nr 37 ferrite lossy at vhf? How about a homebrew plexiglass torroid..permeabilty approx 1 and using a bifilar winding. I have a Radio Shack VHF log periodic antenna..and an mfj hf and vhf antenna analyser. Id like to use it on six, 2 and for fm band listening. I realize I could use a commercial tv balun..but im sure..they are probably very low power ;and I suspect a bit lossy. Any tips before I start winding ..trial and error. 73 Earl VE3AB |
#2
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Earl
If you'd be satisfied with a bit of description from an old ARRL handbook, I'll scan the info for you. See page 16-8 1990 ARRL Handbook. Jerry wrote in message ... Id like to build a 4 to 1 balun..50 mhz through 2mtrs (and above if possible). I have ferrite cores..type 61 and 37 material. Does anyone know how to build a low loss 4 to 1 VHF balun.? I was thinking of taking 2..nr 37 big sleeve beads and making a binocular type of core and winding a broadband xformer..and wind the coax into a choke ahead of it. Question..is nr 37 ferrite lossy at vhf? How about a homebrew plexiglass torroid..permeabilty approx 1 and using a bifilar winding. I have a Radio Shack VHF log periodic antenna..and an mfj hf and vhf antenna analyser. Id like to use it on six, 2 and for fm band listening. I realize I could use a commercial tv balun..but im sure..they are probably very low power ;and I suspect a bit lossy. Any tips before I start winding ..trial and error. 73 Earl VE3AB |
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