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#12
July 25th 16, 05:28 PM
posted to rec.radio.amateur.antenna
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6:1 balun
On Monday, July 25, 2016 at 6:55:50 AM UTC-4, J.B. Wood wrote:
On 07/22/2016 12:44 PM, Ralph Mowery wrote: Does anyone have a good link or design for a 6:1 balun ? Hello, and are you sure of the required impedance ratio? What operating frequency range (bandwidth) is required? The 6:1 ratio seems oddball since in most practical applications integer-squared values suffice. A 6:1 broadband balun using tapered transmission lines (no ferrites required) is realizable but I think the fabrication required is not something most hams would want to tackle. Having said all that a quick Google results in a number of hits including how-to U-toob videos. Sincerely, and 73s from N4GGO, -- J. B. Wood e-mail: 300 Ohms is the typical impedance of a folded dipole at it's resonant frequency. I converted a used Terminated Folded Dipole to a simple folded dipole by removing the termination resister and the 12 to 1 balun. I used an SGC antenna coupler with it with great success. I wanted to use the build in antenna tuner in my Yaesu FT-1000 with it but that was futile until I bought a 6 to 1 balun and connected it to the antenna with 300 Ohm window line. Now the built in tuner has no trouble obtaining a match from 160 to 6 Meters. I was told by many on an antenna usenet group that I could use a 4-1 balun and 450 ohm ladder line rather than bothering with the 300 ohm stuff and the 6 to 1 balun. In each case using the 450 LL and the 4-1 balun both separately and together the internal tuner would fail to match the load on many frequencies. Once I changed to a complete match at resonance the internal tuner could manage the rest. -- Tom |
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