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Radio Road Which tuner to get and getting the most from it. Thank God, for the radio! |
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Radio Road Which tuner to get and getting the most from it. Thank God, for the radio! |
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In Reply to: Antennas ... posted by SamA on November 9, 2006 at 14:26:05:
You know my views anyway, a directional antenna is better but perhaps you don't have a lot of room in your loft.I am guessing that you don't need a rotator, you are trying to - 'pick OUT' - just one station? right?!
So you might fit in a small 3 to 4 element YAGI cut for that frequency only - instead of all of band II - OR * put three quads again cut for that frequency alone - a front bit -1 - a bit smaller and 3 a bit larger and you still only connect to the central one- 2. similar spacings in depth along the boom/mounting which can be wood same lengths of elements/sides | |_| iytmmeaning. such a 3 element quad - if for a loft each square could be built on squares of 3ply - thin allum. sheets or strip say 6 inch flashing and aluminium pop rivets
and you cut slots in a piece of two by 4 that will sit on its 2 inch side - hold in place with a couple of nails where it crosses a ceiling beam!
Room to put up a big exterior wire rhombic <>--------- > ?????
each side should be set to be an exact wavelength OR 2 long you divide the propagation % for your ribbon into the lambda number to get the length of ribbon !!!! Ribbon is quicker IIRC so use .9 as an estimate for seeing if it could fit.
I think the article gives the arithmetic for the total length of the two combined V antennas (triangles) along the pick-up axis - which depends on what you do with the included smaller angle - is swings and roundabouts there, too.
But you need to be able to align it right at the translator, email me for the copy of the famous 'Audio' article to get your head round the what 'if' issues - IF would one fit!? that is.
especially - how many of the 4 masts you can do with out. Via trees, febce post extensions etc, don't forget we can use longish ropes too - even two per corner - with egg insulators, and I'd work you through all that - frigging in the rigging! by keeping it simple and safe!
one lambda segments maye be all we can fit into your block an out of sight, but IF you make it from 300ohm exterior UV stable TV ribbon you've almost doubled the antenna anyway!
the assembly should be almost invisible if you use a cream plastic ribbon or run some exterior UV paint - In which case use eggshell blue, like a WWII fighterplanes underside!? and yr neighbours will forget its there!!!
It must be well above head-height for you and guests, say ~ 'a tennis- racquet on a 6+footer's extended arm' high! ~ but does not need to be above ALL trees or shrubs - and we'll have to protect the system with arrestors, a DC blocker cap and some VDR's. Some buried ground resonant ie lambda x 1 again! radials from the RF earth rod you would be banging in - along with a ligntning ground rod or two!!
You cut a slot with a spade and press them in - depends on where lawns and paths are, but it does offer even less noise and less RFI at night.
A bit of work but it may well be way the best.
It will work perfectly well on all of band-II mind - but that's only a maybe - the way FM is going in your neck of the woods.
NB for seeing if one could fit your block keep these factors in mind.
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I have just re-realised (? ;-)!) that you DO have other stations on either side ~ frequency-wise ~ of the desired returnee station! Correct?
I apologise that I did not fully get this,
I can help you a lot more I hope.
but you will need to think this through, too-
So, are these two problem stations also to either side or where on the compass? because we may be able to fix yr problem several ways - and this may well mean one or more antenna / solutions.
EG. installing a specialist DIY'd ant. cut to this station and prefiltered at the masthead - or specific narrow IF switching in the tuner/s?
on a plan view of your block home drive ways paths and out buildings and trees and fences. showing the directions as an arrowheaded line - with an estimated bearing (that you can stick to) for - each - station desired or that are a PROBLEM even if NOT desired! ;-)! and distances from you - and if you know it their power output in kw's!
You may just get lucky, a truly directional antenna CAN pick stuff OUT
place bearings, distances, freq., and power in consistent places around each arrow.
scan it in to your pc and send it to me. hints!? The bearings at this last 'sketch-point' can be drawn with a child's half circle compass once you've got magnetic compass bearings onto a local map for each station and see how they cross your block and street.
the cubical quad if you still have it can help with checking the bearings
WarmestTimbo in Oz
The Skyptical Mensurer and Audio Scrounger'Still not saluting.'
Read about and view system at:
http://www.theanalogdept.com/tim_bailey.htm
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Follow Ups
- when you say cubical quad are we talking just one square outline of foil or strip*? RHOMBICs? - Timbo in Oz 15:58:00 11/09/06 (0)
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