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6M stacked loops - best height above ground?
Currently the top loop is at only 20ft but I am making many contacts. Soon
however they will be placed off a sidearm on the tower. The top loop could then be as high as 80 ft. I have read and read about this topic. Does anyone have any first hand knowledge of 6M height above ground comparisons especially for stacked loops? Thanks.... -- Charlie-AD5TH |
6M stacked loops - best height above ground?
On Tue, 27 Dec 2005 10:52:54 -0600, "Charlie"
wrote: Currently the top loop is at only 20ft but I am making many contacts. Soon however they will be placed off a sidearm on the tower. The top loop could then be as high as 80 ft. I have read and read about this topic. Does anyone have any first hand knowledge of 6M height above ground comparisons especially for stacked loops? Thanks.... You really want the lower of the two higher than 20ft. It's really simple, higher is better. We are talking VHF and if there is nothing going on propagation wise then height above average terrain determines what your radio horizon will be. For that higher wins. Simply put, 80ft will be much better than 20 and only slightly better than 40. Allison |
6M stacked loops - best height above ground?
ORIGINAL MESSAGE: On Tue, 27 Dec 2005 10:52:54 -0600, "Charlie" wrote: Currently the top loop is at only 20ft but I am making many contacts. Soon however they will be placed off a sidearm on the tower. The top loop could then be as high as 80 ft. I have read and read about this topic. Does anyone have any first hand knowledge of 6M height above ground comparisons especially for stacked loops? Thanks.... ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ I'm not that sure about loops, but for yagis working DX, the optimum height seems to be about 35 feet. Higher is better for ground wave, but for DX, 35 is best, believe it or not. This has been proven with crank up towers many times. It may well be the same for loops. 73, Bill W6WRT |
6M stacked loops - best height above ground?
"Charlie" wrote in message ... Currently the top loop is at only 20ft but I am making many contacts. Soon however they will be placed off a sidearm on the tower. The top loop could then be as high as 80 ft. I have read and read about this topic. Does anyone have any first hand knowledge of 6M height above ground comparisons especially for stacked loops? Thanks.... 6m is line-of-sight, so higher is better than lower. If you have the opportunity to put it 80 ft high - do it. why are you stacking loops? why not make a quad ? |
6M stacked loops - best height above ground?
Thank you Allison.....
-- Charlie wrote in message ... On Tue, 27 Dec 2005 10:52:54 -0600, "Charlie" wrote: Currently the top loop is at only 20ft but I am making many contacts. Soon however they will be placed off a sidearm on the tower. The top loop could then be as high as 80 ft. I have read and read about this topic. Does anyone have any first hand knowledge of 6M height above ground comparisons especially for stacked loops? Thanks.... You really want the lower of the two higher than 20ft. It's really simple, higher is better. We are talking VHF and if there is nothing going on propagation wise then height above average terrain determines what your radio horizon will be. For that higher wins. Simply put, 80ft will be much better than 20 and only slightly better than 40. Allison |
6M stacked loops - best height above ground?
Hi Bill...this is also what I have found to be the crux of my dilemma. If I
should strive to optimize height for DX or terrestrial contacts. I have need for both so I am going to need to compromise a bit. TY again for your input. -- Charlie "Bill Turner" wrote in message ... ORIGINAL MESSAGE: On Tue, 27 Dec 2005 10:52:54 -0600, "Charlie" wrote: Currently the top loop is at only 20ft but I am making many contacts. Soon however they will be placed off a sidearm on the tower. The top loop could then be as high as 80 ft. I have read and read about this topic. Does anyone have any first hand knowledge of 6M height above ground comparisons especially for stacked loops? Thanks.... ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ I'm not that sure about loops, but for yagis working DX, the optimum height seems to be about 35 feet. Higher is better for ground wave, but for DX, 35 is best, believe it or not. This has been proven with crank up towers many times. It may well be the same for loops. 73, Bill W6WRT |
6M stacked loops - best height above ground?
Currently the top loop is at only 20ft but I am making many contacts. Soon however they will be placed off a sidearm on the tower. The top loop could then be as high as 80 ft. I have read and read about this topic. Does anyone have any first hand knowledge of 6M height above ground comparisons especially for stacked loops? Thanks.... Charlie, Try asking these guys. WWW.uksmg.org 73's De Dave M1BTI -- Amateur Radio Call Sign M1BTI, Located in Manchester England. Locator square IO83TK Chairman Of Trafford Radio Club. Club Call Signs G0TRG & M1BBP Located at Umist, University Of Manchester Institute For Science And Technology Share What You Know, Learn What You Dont. |
6M stacked loops - best height above ground?
On Wed, 28 Dec 2005 02:33:45 -0500, "Hal Rosser"
wrote: "Charlie" wrote in message ... Currently the top loop is at only 20ft but I am making many contacts. Soon however they will be placed off a sidearm on the tower. The top loop could then be as high as 80 ft. I have read and read about this topic. Does anyone have any first hand knowledge of 6M height above ground comparisons especially for stacked loops? Thanks.... 6m is line-of-sight, so higher is better than lower. If you have the opportunity to put it 80 ft high - do it. why are you stacking loops? why not make a quad ? I can answer for him. Stacked loops offer some amount of gain but are omnidirectional. A 2 element quad, offers slightly more gain but is directional. If both are on the SIDE of a tower, one has to be turned and is expensive to do that. Actually a single loop has better high angle when mounted high up than a stacked pair. After trying a lot of 6m antennas. Quads with wires thinner than 1/4" are only ok but doo poorly with ice and high wind. I'd do a yagi of 4 or more elements for gain and F/B and a loop up high for local nets(omni). Allison |
6M stacked loops - best height above ground?
Hi Charlie
I have read some of the responses you have received already. As you asked for first hand experience I hadnt commented initially. I wonder if you have tried modelling your configuration with height variables and applying the resultant radiation pattern to propagation modes? I'd suggest ground conditions for your area also need to be entered. I seem to remember from my dim dark past that ground reflections (and hence undesirable skyward radiation - often not usually an issue on VHF) are more of a problem when using a lower gain antenna. Maybe the loop in that respect might be worse than a quad/yagi? You'd be able to see the dB per foot height changes that occur and make a judgement from that. I have never used horiz loops on 6m. Cheers Bob W5/VK2YQA East Texas Charlie wrote: I have read and read about this topic. Does anyone have any first hand knowledge of 6M height above ground comparisons especially for stacked loops? Thanks.... |
6M stacked loops - best height above ground?
On Wed, 28 Dec 2005 02:33:45 -0500, Hal Rosser wrote:
"Charlie" wrote in message ... Currently the top loop is at only 20ft but I am making many contacts. Soon however they will be placed off a sidearm on the tower. The top loop could then be as high as 80 ft. I have read and read about this topic. Does anyone have any first hand knowledge of 6M height above ground comparisons especially for stacked loops? Thanks.... 6m is line-of-sight, so higher is better than lower. IT IS??? !!! Then, I guess my confirmed QSO's with Japan, Australia, Greenland, Chile, and others -- plus all states except R.I. (sigh...) from western Colorado (while running just 9.5 watts) simply never happened. Jonesy -- Marvin L Jones | jonz | W3DHJ | linux Pueblo, Colorado | @ | Jonesy | OS/2 __ 38.24N 104.55W | config.com | DM78rf | SK |
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