On January 27, 2013 at 02:13, BIGCROW said...
Whereas having thicker elements would make the antenna more receptive to various frequencies, it is important to note that the majority of the signal moves along the periphery of the metal, so no coatings and no corrosion will be best.
Why? A coating will simply be a (likely) non-conductive cover over the actual outer diameter of the element. It should not interfere with the signal at all. On the other hand, corrosion will indeed interfere with the operation of the antenna as a)it could well be non-conductive variety of the metal, such as rust, which might actually act as a shield (just guessing) and corrosion will reduce the diameter of the conductive part of the antenna, sharpening its tuning, i.e. making it less broadband.
Also, the vee shape of the elements accommodates broadband reception because of the 3 inch gap at the ends, the current 'seeing' a broader periphery than the actual thickness of the element wire.
Makes sense.
Old analog tv had 6 MHz bandwidth to facilitate analog broadcasting of three or more separate signals,
Sorry, wrong; the analog signal occupied 6 mHz of bandwidth, including a dead band on each side to reduce co-channel interference.
and i haven't studied digital, but maybe digital stations wouldn't require as much bandwidth, as a whole big analog wave for each television function, ie: audio, colour, actual picture, etc., would now me reduced to digital pulses instead. Hopefully someone here knows about these intricacies...
The channel frequencies have not changed, leaving 6 mHz betweeen carriers, so even if that's true, it has no effect on the situation. And digital signals need to be "condensed" because they have so many more individual signals than analog signals.
Another reason, probably, for this 4 tiered arrangement would be it's space saving property. A big, long yagi log periodic might make the neighbors jump...
Nope. This is four individual antennas, their signals adding up for more output, their vertical arrangement making them more vertically directional, that is, more sensitive to pointing up or down than a single element would be.
I'm surprised that there's no reflector on the back of this antenna. The screen you usually see on the back side of a commercial antenna of this sort increases the signal at least a couple of dB as well as increasing directionality.
