build a tuned antenna for one VHF Channel
I would like to pick up a Channel 8 (real) that is 40.6 miles from me with a signal NM of 17.5dB and power -73.3dBm.
As an amature I read this channel is 180-186 mHz. Would a simple dipole antenna roof mounted pick this up reliably? I also read the dipole needs to be 31" to tune to this frequency. I assume 31" each side and positioned as a "T" If this would work, what matching transformer would be needed 75 or 300 Ohm? Thanks. |
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I'm sure it would be a standard 300/75 balun. |
I have built successful antennas based on the design generated by this software... http://forum.tvfool.com/showthread.php?t=1106
I opted to use a folded dipole as the driven element, and used an off-the-shelf 75/300Ω transformer to couple to the down-lead. |
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Even if I construct my simple 31" dipole, I'm not sure of the distance between the two poles. I can build if I can work from a well thought out design like what I saw on a PDF file here for the 195Mhz, but instead for the 180-186 range. If I am reading correctly, this program VK5DJ is exactly for that. Just getting a bit over my head. |
Ignore the Youtube UHF antennas, your requirements are completely different since you're looking for VHF, not UHF. You'd have to rescale the coat hanger antennas by a factor of 2.5 to 4X for VHF.
Our simple VHF Retro Fit Kit may well do the job. It's a dipole that's tuned to 195 MHz (ch 10) and there's very, very little drop off in performance on channel 8. If not, you will need to step up to a more directional array of elements to get better reception of a single VHF channel. An additional resource for designing your own is at http://www.k7mem.com/Electronic_Note.../yagi_vhf.html Otherwise, there are commercially available high-VHF antennas such as our ClearStream 5 that would be expected to do the job. |
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