- Replacement cabel tapedeck bazooka license#
- Replacement cabel tapedeck bazooka tv#
- Replacement cabel tapedeck bazooka free#
Replacement cabel tapedeck bazooka license#
I for one first obtained my license as a college student. If you know something bad about them please… elaborate!Ģ) $57 could very well be prohibitive. Some clever engineering that I wasn’t familiar with.ġ) What type of balun are you talking about? A 1:1 toroid? These things are all over both the internet and amateur radio books.
Baluns have very low loss.ĥ) It’s not obvious but one of the two wingdings is inside a tube which means it’s winding radius is greater than the other.
Replacement cabel tapedeck bazooka tv#
In fact VHF and UHF TV antennas had a 75 to 300 ohm balun. In any case this works to very high frequencies. Ferrite cores can be purchased according to grade. One cancels the other so to speak.ģ) There is no capacitor at this end – just the transformer.Ĥ) The frequency and bandwidth is dependent on the grade of ferrite in the core. I had this argument in HAD once before about twisted wire being used for power and my argument was that the twisted wire electrically evaluates to a bifilar wound transformer (which is what this is) that rejects common mode current while others argued that twisted wire electrically evaluates to two independent inductors.ġ) One side of the wire is signal/ground and the other is balanced signal.Ģ) It is not very inductive as it’s bilifar wound and the currents are magnetically locked together. Posted in Radio Hacks Tagged 1:1, amateur, antenna, balanced, balun, bifilar, dipole, Guanella, ham, unbalanced Post navigation We’ve talked a bit about the Yagi-Uda antenna, and we’ve showcased a cool magnetic loop antenna, but there’s precious little about the humble dipole. With as much effort as hams put into antenna design, there’s a surprising dearth of Hackaday articles on the subject. We appreciate the careful winding of the choke and the care taken to make this both mechanically and electrically sound, and not letting that RG-11 go to waste is a plus. To tweak the characteristic impedance to the 75 Ω needed for his antenna and feedline, added short lengths of Teflon insulation to one of the conductors, which is as fussy a bit of work as we’ve seen in a while. The balun built is a bifilar 1:1 design, with two parallel wires wound onto a ferrite core. For hams, baluns are particularly useful to connect a dipole antenna, which is naturally balanced, to an unbalanced coax feedline.
Replacement cabel tapedeck bazooka free#
Not willing to waste a bounty of free coax, one ham built a custom 1:1 current balun for a 75 Ω dipole.Ĭonverting between balanced and unbalanced signals is the job of a balun, and it’s where the device derives its name. It can be tempting to use it in antenna projects, but the characteristic impedance of RG-11 is 75 Ω, whereas the ham world is geared to 50 Ω. It’s a dilemma many hams face: it’s easy to find yourself with a big spool of RG-11 coax cable, usually after a big cable TV wiring project.
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