antenna delta match impedance
antenna delta match impedance
(OP)
Anyone know where to find the equations for dimensions of a delta-match for a desired impedance? I find dimensions for 600ohm delta match everywhere. A 300ohm should tap a little closer to the middle of a half-wave dipole. I can't seem to find equations for this anywhere online. I know that using the 600ohm delta with a 300ohm line is not to bad, but would prefer to use the correct dimensions.





RE: antenna delta match impedance
http://www.ycars.org/EFRA/Module%20C/AntMatch.htm
RE: antenna delta match impedance
RE: antenna delta match impedance
For VHF receiving antennas, matching is typically extremely (!) non-critical. For example, I designed (using freeware Yagi design software) and built a batch of TV channel 8 Yagi antennas (to address a local problem). The 'driven' element was folded, and thus nominally about 300 ohms. But the Z would have been lowered by the other elements to about 200 ohms. I just ignored that little detail and used a little TV balun to connect the driven element to the 75 ohm coax. The antennas worked perfectly and provided superb reception.
So just build your prototype and tweak it for best results.
PS: 300 ohm twinlead is kinda sorta almost arguably obsolete. Most would use coaxial cable.
RE: antenna delta match impedance
RE: antenna delta match impedance
I used electrical conduit for the boom and stiff ceiling tile hanging wire for the elements. The only difficult bit was the plastic insulation for the dipole.