In Reply to: Well, you can forget about.... posted by rlw on September 17, 2015 at 09:21:52:
So, it doesn't matter about how 'level' they are, 1970's sprung wooden floor makes that a nonsense, anyway. ;-)I use angle measuring tool with a spirit level, plus a torch in the dark and a tape measure - to get close to equilateral distances, and then I listen for focus, small adjustments until it all clicks into place.
Vacuuming under them happens just once a year. One gets better and quicker with practice.
In any case there's a new 3-sphere point-source array / tower coming where all baffles will be kept vertical. ? WR driver middle (smaller sphere) and a woofer top and bottom in the sphere model pictured. Then, three distributed subs from 35 down.
Antennas? I am old enough to know a bit about the DEW line :-).
My knowledge of antennas and RF began with going down the senior NCO path for Australian Infantry. You were expected to have passed for signaler, as well as all the other specialist roles of an Infantry Bn, eg. mortars, MGs, Int. When equipment changed you became a student again for a few hrs or days.
Back-pack or pouch-pack radios. Or the same types in 4WDs. I found in the field that the best reception with the multi-segment whips or laminate bendy whips was always where there was the least cover from view / fire. Concentrates the mind.
So my platoon -> coy -> Bn began to get through lots of long-wires and vertical end-feds. It is surprising how quickly you can get a long antenna up with a corded weight! ;-). And how difficult it is to pull them down. ;-)
That antenna up the top of the mast is going to be replaced, soon. And the UHF will go as it is redundant. No UHF TV on the main tower.
It was bought in 1980/1 to do VHF band I, II and III (TV and FM) duty and didn't need a lot of gain, as signal levels were then quite high. But I needed multi-path / ghost help? Canberra is in the Great Dividing Range. And, we sit between two decent sized hills, Mt Taylor and Mt Arawang.
There will hence be two 6-element VHF yagi antennas, one for FM* and one for VHF-HD- TV up to our Ch12.
*I don't just need full limiting on my strongest station into my three SS FM front ends, but into the valve front-end in the main system. And on one of our weakest but good sounding stations, for whom I record live acoustic concerts in two-mike stereo.
On top of that we have several FM and TV wall-plate outlets in the house, the unused ones have load-plugs.
And, now that weak one has moved NE from the main tower that carries most of Canberra's TV and FM.
So, I/we will aim the new higher gain FM antenna between the two sites.
Another influence for audio and radio was John Dunlavy, when he was based here in Canberra, the wave-guide man. He liked / respected these Audiosphere 3s. He was a quite dour man and I was still young.
Warmest
Tim Bailey
Skeptical Measurer & Audio Scrounger
Edits: 09/17/15 09/17/15
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- because they have all freedom's of movement I can 'aim' them - Timbo in Oz 14:27:21 09/17/15 (0)