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| Tweet Topic Started: Thursday, 24. December 2009, 19:01 (1,837 Views) | |
| Ganges Boy | Thursday, 24. December 2009, 19:01 Post #1 |
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hi all, first off merry christmas everyone, can anybody tell me the best twig to use for home base use, ill be useing a s/ star 3900 about 20 amps out of the back, also ,to keep it discreet, would it be ok to secure it to a cast iron fallpipe, and fix it about 2/3 feet above it, i live quite high up, so, dont want to fix it on the chimney stack, 73,s |
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| Offplanet | Thursday, 24. December 2009, 19:42 Post #2 |
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Quite a few choices available - but keeping is discreet narrows it down. The Sirio 827, Imax 2000, Sirio Vector 4000 (Avanti Sigma 4 copy), and the Sirio Starduster M-400 are some of the big performers, but are big., The good old Silver Rod works very well for less than £20 and is a good choice if you don't live in a windy area. If you do live in a windy area then, love 'em or hate 'em, the Antron (Solarcon) A99 is a good choice. If you go down the Antron 99 route, the "Thunderpole A99 Upgrade (Firestik FireUp 99)" is a good performance addition (available from www.kcb.co.uk ). The A99 is white, is of fibreglass construction and looks nice when it's up. Please don't be tempted to go for the compact antennae like the Bazooka as, in a word, they're pants. An honest evaluation of the A99 http://cbradiomagazine.com/Feb%202007/The%...st%20seller.htm A tidy performer - yes, a top end performer no. Not an antenna to put too much power through either, but 20w will be fine. Most antennae fit to a pole, usually 1.5 or 2 inch diameter, so you'd have to figure out a way to attach this to the fallpipe - if you keep the base of the antenna above the fallpipe then all should be ok (the pipe should actually help the groundplane effect). All the above are available from the usual sources www.thunderpole.co.uk - www.kcb.co.uk - www.truck-king.co.uk Hope this helps Gary |
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The CT eXtreme DX Team [imgw=50]http://b1.ifrm.com/2510/101/0/p5000422/mountain.png[/imgw] CTX Founder Member and CTX Team Admin Callsigns - 26-CTX-104, 26-CT-104, 163-CTX-104, 163-CT-104 CTX on Facebook ![]() CTX on Twitter ![]() UKCBTV on Youtube | |
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| Ganges Boy | Thursday, 24. December 2009, 20:23 Post #3 |
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thanks for your reply, will be looking to set it up after new year, i noticed you said i shoul keep the base above the top of the fall pipe, if i attatch the twig to the pipe and just have the top of it just above the top of the fall pipe , will this affect its performance, 73,s |
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| Offplanet | Thursday, 24. December 2009, 20:49 Post #4 |
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The base of the antenna must be above or away from any large objects (especially metal objects) otherwise the performance will be reduced and/or be highly directional and the SWR will be difficult, if not impossible, to tune down. Good luck with the new set-up. |
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The CT eXtreme DX Team [imgw=50]http://b1.ifrm.com/2510/101/0/p5000422/mountain.png[/imgw] CTX Founder Member and CTX Team Admin Callsigns - 26-CTX-104, 26-CT-104, 163-CTX-104, 163-CT-104 CTX on Facebook ![]() CTX on Twitter ![]() UKCBTV on Youtube | |
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| VoG | Thursday, 24. December 2009, 22:22 Post #5 |
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As Offplanet has said, running an antenna close-to any metal object is going to cause serious problems. Positioning a base-antenna parallel to a metal pipe is going to give you huge reflected "RF" and, probably, an impossible SWR. I appreciate you don’t want an obvious and blatant antenna on show but the Solarcon A99 that Gary has suggested is a very subtle aerial and is simply a very slim white glass-fibre “fishing rod”. If you forego the optional ground-plane add-on and the “Fire-up” optional top, they really don’t stand out at all. If you have a really nosey neighbour, an A99 can be explained as “something to improve radio reception” with the inference that it’s for DAB Radio etc. But, if you’re convinced a tall antenna is impossible… In the left of the picture is what I imagine you’re proposing. As shown there is a significant part of the radiating antenna very close to, and parallel to, that metal down-pipe. It is at the very least going to give you very poor performance, it could reflect significant RF back to the radio (by having impossible SWR) and as a result could damage the transmit hardware. The only option that occurs to me is to perhaps use a good mobile antenna located near the top of that Down-pipe (Right-hand side of the picture). In this situation, the whole of the radiating aerial is clear of the down-pipe and, as the Firestick or Tank-whip is fairly high on the side of the house, it would perform pretty well for a Mobile aerial. Obviously, no mobile antenna is going to do as well as a half-wave or five-eights wave “proper” home-base aerial. But it might be a working compromise. Mobile antennae were never designed to be fitted to guttering, down-pipes or whatever, so you’re probably going to have to come up with something to fit it. I’d suggest perhaps a TV antenna mount (something like a TV Cranked Mast from Screwfix - £3.99) fixed to the pipe, and then a modified mirror-mount to fix the Firestick to the Cranked-mast. |
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| Deleted User | Thursday, 24. December 2009, 22:34 Post #6 |
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Good luck with your antenna......never compromise with your antenna/coax......the bigger the better..........I run a Shakesphere Army Bigstick 5/8 wave with an 8 section radial kit...these work far better than Antrons ect.....but unless your lucky via E-bay or a kind mate......the're no longer available new which is very bad news
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| Mark in Essex | Friday, 25. December 2009, 14:57 Post #7 |
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As a plumber i must intervene......they are called soil stacks....4 inch pipe or a 110mm in new money
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[][img][/img][/url] https://www.youtube.com/user/26TANGOMIKE037/videos Nembutol numbs it all But I prefer alcohol | |
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| VoG | Saturday, 26. December 2009, 12:24 Post #8 |
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Thank you Mark... I couldn't remmeber what the damn thing was called, other than, "the big fat black downpipe out of the bathroom that comes from the back of the kharsi!" |
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| Firetrap | Tuesday, 29. December 2009, 16:05 Post #9 |
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Some good advice here!
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Charlie Tango DX www.cbradiouk.com | www.charlietango.co.uk Domain Names For Sale V5Bid.com | Ypsi1.com | 041183.com | Hiya.Mobi | Oddiz.com | DoddP.com Life is not a Conspiracy - Enjoy it, don't be consumed by The Conspiracy Effect | |
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| Mark in Essex | Tuesday, 29. December 2009, 21:19 Post #10 |
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or shit stack ...stink pipe..etc :lol: :lol: :lol: |
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[][img][/img][/url] https://www.youtube.com/user/26TANGOMIKE037/videos Nembutol numbs it all But I prefer alcohol | |
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| Beelzebub | Wednesday, 30. December 2009, 00:46 Post #11 |
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Yep, that'll be the A99 oops.. |
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