|
11 meter beam
Hello I hope I'm not intruding by asking for advice on a CB antenna but I
figured this would be the group to ask about such things for the straight scoop. At any rate I'm considering a store bought beam with both vertical and horizontal polarization and my choices are limited to these two below. (not many being manufactured anymore) The Maco has a 16 foot boom and an advertised gain of 12.5 db, while the JO GUNN has an 8 foot boom and an advertised gain of 14.5 db. I know there is a lot of smoke and mirrors involved with advertised gains and so my question is...is it possible for the JO GUNN to perform as well as the Maco antenna? The GUNN is of much stronger construction and a smaller windload so I'd rather put it up, but the short boom makes me wonder if the gain and rejection numbers are suspect. Any help would be greatly appreciated, antenna choices, price tags and urls below. 73 Stan MACO-Shooting Star $279.95 http://www.mpaudio1.com/Macobeamantennas2.html JO GUNN 3 + 3 STAR $382.00 http://tinyurl.com/6hzteu Oh btw, I'll be tower mounting it about 40' from the ground and turning it with a hamIV rotator. Thanks again. |
11 meter beam
On Thu, 17 Jul 2008 18:37:40 -0400, "Stan Cooper"
wrote: MACO-Shooting Star $279.95 http://www.mpaudio1.com/Macobeamantennas2.html JO GUNN 3 + 3 STAR $382.00 http://tinyurl.com/6hzteu Choose MACO for three reasons: 1. They understand the dB relationship to power gain; b. their dB isn't relative to TRUE (whatever that means); iii. it's cheaper. On the negative side, neither seem to be acquainted with the dBi or dBd basis of comparison (giving them the appearance of being yokels selling out the trunk of their car). Imagine, having more "audio gain" than rf gain from an antenna (do they inluded phased speakers?). A claim of "2kw power handling capability!" is to suggest this is part of the gain package? Don't exceed 2kw/28 input power? Howabout "quad reflector to obtain the best combination of gain and front-to-back ratio." Why not fully quad design to obtain the best combination of ALL gains? What's the difference between FRONT TO BACK RATIO and BACK REJECTION? 73's Richard Clark, KB7QHC |
11 meter beam
"Stan Cooper" wrote in message ... Hello I hope I'm not intruding by asking for advice on a CB antenna but I figured this would be the group to ask about such things for the straight scoop. At any rate I'm considering a store bought beam with both vertical and horizontal polarization and my choices are limited to these two below. (not many being manufactured anymore) The Maco has a 16 foot boom and an advertised gain of 12.5 db, while the JO GUNN has an 8 foot boom and an advertised gain of 14.5 db. I know there is a lot of smoke and mirrors involved with advertised gains and so my question is...is it possible for the JO GUNN to perform as well as the Maco antenna? well, there are a couple possibilities... first the Maco could be poorly designed so it doesn't perform as well as the JO GUNN, or the Maco advertisers could be more honest than the JO GUNN ones are... or the JO GUNN is extremely well designed, or their advertisers aren't as honest as the Maco ones are. OR, they could just be comparing to completely different references, thats the basic problem with antenna gains, they usually don't tell you what they are compared to if the JO GUNN was compared to an isotropic radiator where the Maco was compared to a dipole that buys them a couple db right there. confused yet? there's even more... Maybe the JO GUNN is measured over real ground at the best height and elevation angle they could find... and the Maco was measured in free space. Measuring an antenna over real ground and finding the max gain lobe could give the JO GUNN a whole bunch more gain than the free space Maco... enough to make up for half the boom length and a worse design put together. So there you have it... my suggestion, put up a ground plane to talk to your local buddies and get a ham license so you can legally and openly talk around the world. |
11 meter beam
Stan Cooper wrote:
Hello I hope I'm not intruding by asking for advice on a CB antenna but I figured this would be the group to ask about such things for the straight scoop. At any rate I'm considering a store bought beam with both vertical and horizontal polarization and my choices are limited to these two below. (not many being manufactured anymore) The Maco has a 16 foot boom and an advertised gain of 12.5 db, while the JO GUNN has an 8 foot boom and an advertised gain of 14.5 db. I know there is a lot of smoke and mirrors involved with advertised gains and so my question is...is it possible for the JO GUNN to perform as well as the Maco antenna? The GUNN is of much stronger construction and a smaller windload so I'd rather put it up, but the short boom makes me wonder if the gain and rejection numbers are suspect. Any help would be greatly appreciated, antenna choices, price tags and urls below. 73 Stan MACO-Shooting Star $279.95 http://www.mpaudio1.com/Macobeamantennas2.html JO GUNN 3 + 3 STAR $382.00 http://tinyurl.com/6hzteu Oh btw, I'll be tower mounting it about 40' from the ground and turning it with a hamIV rotator. Thanks again. Stan; I don't know if you have considered it but I would like to suggest that you look into ham radio. It is a more adventurous hobby,one that offers greater opportunity to exercise your operating skills. By and large the licensed ham radio operators offer a courteous, friendly and extremely helpful environment. I have to assume that since you are here looking for assistance you already have a feeling for all this. Getting a ham license has never been easier. There are only three classes of license now, Technician, General and Extra. The code test has been eliminated so that shouldn't be a problem. The tests are multiple choice and have a minimum passing level of 80%. That works out to be 28 correct answers for tech and general out of 35, the extra test has 15 more questions and so requires 40 correct answers. All questions are published and if you go to http://www.qrz.com you can take sample tests. Take enough samples and you should be able to pass the exam. Go to http://www.arrl.org for locations and times for exams. There is a cost for the exam but it isn't much. Now as to your question. There isn't much to recommend either antenna. They are based on designs used in the ham radio field. You might look for these antennas and compare the numbers there. A source of ham radio equipment is www.aesham.com. This is one of the premier ham radio houses. Good luck Dave WD9BDZ |
11 meter beam
The Maco has a 16 foot boom and an advertised gain of 12.5 db, while the JO
GUNN has an 8 foot boom and an advertised gain of 14.5 db. I know there is a lot of smoke and mirrors involved with advertised gains and so my question is...is it possible for the JO GUNN to perform as well as the Maco antenna? I would be sceptical. The fact that both manufacturers are quoting gain in dB, without saying what it's in reference to (dBi for isotropic, dBd for dipole) is a bit of a warning sign. Assume it's dBi - the numbers come out bigger, and that's attractive in ads. I'd be sceptical of the numbers offered for both of these antennas, but I'd be quite a bit more sceptical concerning the JO GUNN. It's probably useful to compare the design, and the numbers, with what's known and published about various reference Yagi designs and the results that can be achieved. I looked at some of the documentation that Cebik (SK) published on his excellent web site. The Maco is advertised as a "6-element" antenna, but the drawing doesn't show a full set of six elements on either vertical or horizontal polarization. I can't tell whether they omitted showing some elements to leave the drawing less cluttered, or whether it's supposed to be a "three elements vertical plus three elements horizontal, equals six elements" design. It looks to me as if it's essentially a Quagi antenna - a quad element in back (reflector?) plus one or more set of linear elements in a Yagi-style arrangement. At 11.5 feet, it's about a third of a wavelength long... and for any antenna of this general type, the boom length is likely to be the parameter which dominates the maximum gain figure you can achieve. Cebik's figures indicate that well-designed quarter-wavelength-boom Yagis typically deliver somewher around 8 dBi of gain, and one-half- wavelength-boom Yagis are up somewhere around 10 dBi. Front-to-back figures in the 25 - 35 dB range seem to be achievable. There's usually a tradeoff in the optimization process... for any given boom length, optimizing for maximum gain will usually cost you F/B ratio, and vice versa. I'd guess that it's *possible* that the Maco actually achieves 12.5 dBi of gain (at least on paper) at some frequency with its one-third-lambda boom length, but that's more than I'd expect. This assumes that the Maco has separate feeds for horizontal and vertical polarization, and that it feeds only one at a time (e.g. via a switch) and that there are no losses involved. If it's actually feeding power to both polarizations at once (either linear or circular), subtract 3 dB from the effective gain to a linearly-polarized vertical or horizontal antenna at the other end. The JO GUNN... well, I'm not sure just what sort of antenna it thinks it is, other than "tries to be snazzy looking". It seems to be a three-element short-beam antenna (at 8 feet it's less than 1/4 wavelength long), and yet it's claiming a 14.5 dB gain. This is around 6 dB more gain than Cebik indicates is delivered by Yagis in this boom-length class. The F/B ratio, "side rejection" and "back rejection" are all extremely high (40 dB)... such high numbers suggest that these are the best-looking numbers, taken from the deepest rejection lobes of a mathematical model of the antenna in free space. The GUNN is of much stronger construction and a smaller windload so I'd rather put it up, but the short boom makes me wonder if the gain and rejection numbers are suspect. Well, before I trusted these numbers at all, I'd want to get a NEC2 or similar model of the antenna from the manufacturer, and run the model myself. My guess is that the Maco folks *might* give you a model deck if you ask nicely, and that the JO GUNN folks with either refuse or say "What are you talking about?" or claim that their antenna incorporates principles that cannot be accurately modeled. -- Dave Platt AE6EO Friends of Jade Warrior home page: http://www.radagast.org/jade-warrior I do _not_ wish to receive unsolicited commercial email, and I will boycott any company which has the gall to send me such ads! |
11 meter beam
Stan, just go with what you like. I too am suspicious of claimed gain by
manufacturers. I will also throw in a plug for getting your ham license. It costs very little to get your license, and it opens many new adventures far and above 11 meters. You can work the world on 100 watts and a wire strung between a couple of trees. Try the practice tests on QRZ.com. 73. Russ W6OHM "Stan Cooper" wrote in message ... Hello I hope I'm not intruding by asking for advice on a CB antenna but I figured this would be the group to ask about such things for the straight scoop. At any rate I'm considering a store bought beam with both vertical and horizontal polarization and my choices are limited to these two below. (not many being manufactured anymore) The Maco has a 16 foot boom and an advertised gain of 12.5 db, while the JO GUNN has an 8 foot boom and an advertised gain of 14.5 db. I know there is a lot of smoke and mirrors involved with advertised gains and so my question is...is it possible for the JO GUNN to perform as well as the Maco antenna? The GUNN is of much stronger construction and a smaller windload so I'd rather put it up, but the short boom makes me wonder if the gain and rejection numbers are suspect. Any help would be greatly appreciated, antenna choices, price tags and urls below. 73 Stan MACO-Shooting Star $279.95 http://www.mpaudio1.com/Macobeamantennas2.html JO GUNN 3 + 3 STAR $382.00 http://tinyurl.com/6hzteu Oh btw, I'll be tower mounting it about 40' from the ground and turning it with a hamIV rotator. Thanks again. |
11 meter beam
Hi Richard
Isnt there a difference there? (I'll admit I dont think in these terms. I use the actual pattern instead) Isn't F/B a comparison of "forward" vs "backward" at the optimum/best case "single angle" and Back Rejection (or some other name) the comparison of all radiated power forward vs backwards? Many parasitic designs end up with very good F/B but as soon as you go off a few degrees a rearward lobe comes into play. Cheers Bob VK2YQA Richard Clark wrote: What's the difference between FRONT TO BACK RATIO and BACK REJECTION? |
11 meter beam
Stan Cooper wrote:
Hello I hope I'm not intruding by asking for advice on a CB antenna but I figured this would be the group to ask about such things for the straight scoop. At any rate I'm considering a store bought beam with both vertical and horizontal polarization and my choices are limited to these two below. (not many being manufactured anymore) The Maco has a 16 foot boom and an advertised gain of 12.5 db, while the JO GUNN has an 8 foot boom and an advertised gain of 14.5 db. I know there is a lot of smoke and mirrors involved with advertised gains and so my question is...is it possible for the JO GUNN to perform as well as the Maco antenna? The GUNN is of much stronger construction and a smaller windload so I'd rather put it up, but the short boom makes me wonder if the gain and rejection numbers are suspect. Any help would be greatly appreciated, antenna choices, price tags and urls below. 73 Stan MACO-Shooting Star $279.95 http://www.mpaudio1.com/Macobeamantennas2.html JO GUNN 3 + 3 STAR $382.00 http://tinyurl.com/6hzteu Oh btw, I'll be tower mounting it about 40' from the ground and turning it with a hamIV rotator. Thanks again. Hi Stan, The Maco Shooting star "data" says it has a gain of 14dB (the Comet is the one rated at 12.5dB). Both manufacturers claim decibels of gain as well as power gain. The relationship is logarithmic, where dB = 10 log(base10) P1/P2. The Maco Shooting star claims 28X power gain. This would be 14.47dB... close to what they claim. The JO GUNN 3+3 Star claims 40X power gain. This would be 16.02dB... 2dB more than what they claim. The Maco item doesn't make any claim about Front/Back or Front/Side rejection, while the JO GUNN item makes some very wild claims of over 40dB. Based on this information, I'd probably go with the Maco. The late William I. Orr said it best in the preface to his book, 'The Truth About CB Antennas', "PT Barnum is alive and well, and writing CB antenna ads." Bryan WA7PRC |
11 meter beam
Stan Cooper wrote:
... MACO-Shooting Star $279.95 http://www.mpaudio1.com/Macobeamantennas2.html JO GUNN 3 + 3 STAR $382.00 http://tinyurl.com/6hzteu Oh btw, I'll be tower mounting it about 40' from the ground and turning it with a hamIV rotator. Thanks again. I have never ran either one. However, I would go with the MACO also--if forced to choose on the data which has been presented, alone ... It is a four element antenna, the JO GUNN is three and in an unconventional configuration. The MACO, on the other hand, appears to be completely switchable from vertical mode to horizontal mode. Regards, JS |
11 meter beam
On Thu, 17 Jul 2008 20:30:48 -0500, Bob Bob
wrote: Hi Richard Isnt there a difference there? (I'll admit I dont think in these terms. I use the actual pattern instead) Isn't F/B a comparison of "forward" vs "backward" at the optimum/best case "single angle" and Back Rejection (or some other name) the comparison of all radiated power forward vs backwards? Many parasitic designs end up with very good F/B but as soon as you go off a few degrees a rearward lobe comes into play. Cheers Bob VK2YQA Richard Clark wrote: What's the difference between FRONT TO BACK RATIO and BACK REJECTION? Hi Bobē, If you examine the specifications for both, they reveal exactly the same value. It follows they measure the same thing but use different terms (one can only imagine they have ad writers who find their inspiration for straining terms in claims for Gussian antennas). There are very few antennas with a null located at 180° (Cardioid comes to mind); and, as you infer, it quickly disappears off boresight. Further, your suggestion of average forward compared to average backward is, perhaps, a useful indicator. However, neither supplier appears to interested in averages. 73's Richard Clark, KB7QHC |
11 meter beam
When you are measuring gain, if dBi isn't specified it is normal to assume
dBd. I cannot get that JoGunn page to load and display, but based on what you have said, the better, or should I say, more believable one is the Maco. Those gain numbers seem high by a bit for a four element antenna, but there may be some advantage from the dual polarity, but I doubt it, as the power is split between Hand V as well going in. And 4 elements/16 foot boom, 27 MHz sounds much closer to right than 8' boom 3 elements and 14 db. Those are just plain wrong, or at least lack reference. The ARRL handbook years ago had a construction article on a ten meter beam, that I scaled very successfully to 15 meters. 12 foot boom three eleemnts, made from basic aluminum tubing, probably cost well under $100 to build today. But you'd need to be handy with a 'grid dip meter" to get it right. Just another thought. My $0.02 getting ham license and operating ten meters, I'd guess you're actually interested in talking to someone, so 11 meters is probably better for that. I frequently listen on 27.185 as an indicator of weather or not ten meters is open. Lots of activity from about 26.8 thru 27.6 or higher, nothing above 28 except some lonely beacons...true shame. But if you go beyond the ten meter deal, and get with the other HF bands or 2 meters, 440, etc, you'll have a blast, and the code no longer stands in the way... Good luck with the Maco. GeorgeC W2DB Awstin, TX |
11 meter beam
root wrote in
: When you are measuring gain, if dBi isn't specified it is normal to assume dBd. I cannot get that JoGunn page to load and display, but George, Fundamental relationships depend on dBi, it is dBd that is the fudge. dBd seems to have its popularity from the mistaken view by some that because it is not possible to construct a real isotropic radiator, that dBi doesn't have a real meaning. Owen |
11 meter beam
"Stan Cooper" wrote The Maco has a 16 foot boom and an advertised gain of 12.5 db, while the JO GUNN has an 8 foot boom and an advertised gain of 14.5 db. I know there is a lot of smoke and mirrors involved with advertised gains and so my question is...is it possible for the JO GUNN to perform as well as the Maco antenna? The GUNN is of much stronger construction and a smaller windload so I'd rather put it up, but the short boom makes me wonder if the gain and rejection numbers are suspect. Any help would be greatly appreciated, antenna choices, price tags and urls below. snip Stan The Maco antennas are built here in Memphis, and are not of a high quality. If I had to use one of their products, it would be a pair of horizontal-stacked V-quads. Small, light, works well and can be easily re-tuned to 10 meters later on. The Jo Gunn model is a copy of the Charles "Gizmotchi" antenna ( still being made, by the way). Construction is better, tubing fit and finish are quite good, but the gain figures are really about 7 dbi for both of the antennas. Gain figures are inflated to catch a sale, so I'd consider quality, price, and strength of materials/design as more important factors. I've got enough tubing in my antenna junk to build a 3 element Gizmotchi for 10 meters, and I might just do that, for the sake of having something different in the neighborhood. Mike W5CHR Memphis |
11 meter beam
Stan Cooper wrote:
... You might as well check out this page, you can find the prices on a link on the page ... http://www.gizmotchy.com/ Regards, JS |
11 meter beam
David G. Nagel wrote:
I don't know if you have considered it but I would like to suggest that you look into ham radio. It is a more adventurous hobby,one that offers greater opportunity to exercise your operating skills. By and large the licensed ham radio operators offer a courteous, friendly and extremely helpful environment. I have to assume that since you are here looking for assistance you already have a feeling for all this. Getting a ham license has never been easier. There are only three classes of license now, Technician, General and Extra. The code test has been eliminated so that shouldn't be a problem. Since he did not say where he is, your answer may be wrong. While I agree with it in principal, not everyone has it so easy. Here in Israel there still is a code requirement, testing is twice a year, and ANY permanent antenna requires a permit which no one seems to know how to get. Technicaly any operation over 20 watts EIRP requires radiation level certification. But then CB is just as bad. Except for a few off-roaders who have not gone to 446 mHz it's even deader than ham radio. Geoff. -- Geoffrey S. Mendelson, Jerusalem, Israel N3OWJ/4X1GM |
11 meter beam
Owen Duffy wrote:
George, Fundamental relationships depend on dBi, it is dBd that is the fudge. dBd seems to have its popularity from the mistaken view by some that because it is not possible to construct a real isotropic radiator, that dBi doesn't have a real meaning. Owen At least one manufacturer has taken advantage of the fact that, unlike dBi, dBd has no universal definition. Some think it's dB relative to a dipole in free space; others think it's relative to a dipole mounted over ground. And few seem to realize that the difference between the two is typically 4 - 6 dB. Creative marketeers are able to capitalize on this confusion, and have. Roy Lewallen, W7EL |
11 meter beam
Geoffrey S. Mendelson wrote:
David G. Nagel wrote: I don't know if you have considered it but I would like to suggest that you look into ham radio. It is a more adventurous hobby,one that offers greater opportunity to exercise your operating skills. By and large the licensed ham radio operators offer a courteous, friendly and extremely helpful environment. I have to assume that since you are here looking for assistance you already have a feeling for all this. Getting a ham license has never been easier. There are only three classes of license now, Technician, General and Extra. The code test has been eliminated so that shouldn't be a problem. Since he did not say where he is, your answer may be wrong. While I agree with it in principal, not everyone has it so easy. Here in Israel there still is a code requirement, testing is twice a year, and ANY permanent antenna requires a permit which no one seems to know how to get. Technicaly any operation over 20 watts EIRP requires radiation level certification. But then CB is just as bad. Except for a few off-roaders who have not gone to 446 mHz it's even deader than ham radio. Geoff. Geoff; Your are right in one sense, however the antenna's in question are, I believe, USA products so it is fairly save to assume that the writer is a USA resident. From your comments I assume (that word again) that you are a resident of Israel. Given the situation there I can see why the government would try to make it hard for someone to install and operate a radio station. I look forward to the day when everyone in the Mideast can live together in peace and harmony. Until that time thank you for your comments. Dave WD9BDZ |
11 meter beam
Roy Lewallen wrote:
Owen Duffy wrote: George, Fundamental relationships depend on dBi, it is dBd that is the fudge. dBd seems to have its popularity from the mistaken view by some that because it is not possible to construct a real isotropic radiator, that dBi doesn't have a real meaning. Owen At least one manufacturer has taken advantage of the fact that, unlike dBi, dBd has no universal definition. Some think it's dB relative to a dipole in free space; others think it's relative to a dipole mounted over ground. And few seem to realize that the difference between the two is typically 4 - 6 dB. Creative marketeers are able to capitalize on this confusion, and have. Roy Lewallen, W7EL Roy; I think that this a subject custom made for the phrase: Your Mileage May Vary. Dave WD9BDZ |
11 meter beam
David G. Nagel wrote:
Your are right in one sense, however the antenna's in question are, I believe, USA products so it is fairly save to assume that the writer is a USA resident. I thought so, but sometimes the people asking are not. They only have access to U.S. manufacturer's products and catalogs via web sites, with no local dealers. From your comments I assume (that word again) that you are a resident of Israel. Given the situation there I can see why the government would try to make it hard for someone to install and operate a radio station. Well, actually it's not. The antenna restriction is because the "cellphone towers will kill you" people have forced laws through to prevent anyone setting up a radio transmitter in their neighborhood. The morse code requirment is because the people who run the Israel equivalent of the ARRL pushed the Minstry of Communications to keep it. It keeps out new hams from foreign countries. I have no idea how they handle visiting operators now. I look forward to the day when everyone in the Mideast can live together in peace and harmony. Thanks, Geoff. -- Geoffrey S. Mendelson, Jerusalem, Israel N3OWJ/4X1GM |
11 meter beam
Hello Stan:
Try to find a Hy-Gain 3 element yagi beam that uses the Hairpin Matching system. And use the Hy-Gain Balun. That way you won't have the significant loss of the Gamma Match. Jay in the Mojave Stan Cooper wrote: Hello I hope I'm not intruding by asking for advice on a CB antenna but I figured this would be the group to ask about such things for the straight scoop. At any rate I'm considering a store bought beam with both vertical and horizontal polarization and my choices are limited to these two below. (not many being manufactured anymore) The Maco has a 16 foot boom and an advertised gain of 12.5 db, while the JO GUNN has an 8 foot boom and an advertised gain of 14.5 db. I know there is a lot of smoke and mirrors involved with advertised gains and so my question is...is it possible for the JO GUNN to perform as well as the Maco antenna? The GUNN is of much stronger construction and a smaller windload so I'd rather put it up, but the short boom makes me wonder if the gain and rejection numbers are suspect. Any help would be greatly appreciated, antenna choices, price tags and urls below. 73 Stan MACO-Shooting Star $279.95 http://www.mpaudio1.com/Macobeamantennas2.html JO GUNN 3 + 3 STAR $382.00 http://tinyurl.com/6hzteu Oh btw, I'll be tower mounting it about 40' from the ground and turning it with a hamIV rotator. Thanks again. |
11 meter beam
On Jul 17, 6:37*pm, "Stan Cooper" wrote:
Hello I hope I'm not intruding by asking for advice on a CB antenna but I figured this would be the group to ask about such things for the straight scoop. At any rate I'm considering a store bought beam with both vertical and horizontal polarization and my choices are limited to these two below.. (not many being manufactured anymore) The Maco has a 16 foot boom and an advertised gain of 12.5 db, while the JO GUNN has an 8 foot boom and an advertised gain of 14.5 db. I know there is a lot of smoke and mirrors involved with advertised gains and so my question is...is it possible for the JO GUNN to perform as well as the Maco antenna? The GUNN is of much stronger construction and a smaller windload so I'd rather put it up, but the short boom makes me wonder if the gain and rejection numbers are suspect. Any help would be greatly appreciated, antenna choices, price tags and urls below. 73 Stan MACO-Shooting Star $279.95http://www.mpaudio1.com/Macobeamantennas2.html JO GUNN 3 + 3 STAR $382.00http://tinyurl.com/6hzteu Oh btw, I'll be tower mounting it about 40' from the ground and turning it with a hamIV rotator. Thanks again. Why buy either. There are plenty of plans for beams around. It is my opinion that building one from scratch is not much more difficult that putting one togetther from the box. In the process you will learn how boom length, element spacing, numer of elements all come together to give you a good antenna, If you can download the assembly manual you will probably have enough detail for building your own. Back in the 70s I belonged to a CB club. A group of us started building antennas for ourselves and other club members. We purchased our aluminum at an extrusion plant. By going through there reject pile were were able to get the tubing for pennies on the pound. We placed the tubing in a jig and was able to cut nearly all the pieces(even for large booms) to length with one pass of a radial arm saw. Nearly all that was left was to put the parts in a cardboard box with instructions and a hardware list. This was a great club with over a thousand members. We did not tolerate illegal or obnoxous operation. The penalty was expulsion from the club and you would be placed on the list where other members just wouldnt talk to you. On the other hand benifits of belonging to the club were considerable. Education Inexpensive antennas and equipment lots of help and fellowship and numerous family oriented events throughout the year. The group as a whole was a huge pool of talent for just about anything you could think of and we helped each in a lot more ways than just CB. A model for even the best ham clubs I have seen. Jimmie . |
11 meter beam
On Thu, 17 Jul 2008 18:11:58 -0700, "998cc"
wrote: Stan, just go with what you like. I too am suspicious of claimed gain by manufacturers. I will also throw in a plug for getting your ham license. It costs very little to get your license, and it opens many new adventures far and above 11 meters. You can work the world on 100 watts and a wire strung between a couple of trees. Try the practice tests on QRZ.com. 73. Russ W6OHM "Stan Cooper" wrote in message ... Hello I hope I'm not intruding by asking for advice on a CB antenna but I figured this would be the group to ask about such things for the straight scoop. At any rate I'm considering a store bought beam with both vertical and horizontal polarization and my choices are limited to these two below. (not many being manufactured anymore) The Maco has a 16 foot boom and an advertised gain of 12.5 db, while the JO GUNN has an 8 foot boom and an advertised gain of 14.5 db. I know there is a lot of smoke and mirrors involved with advertised gains and so my question is...is it possible for the JO GUNN to perform as well as the Maco antenna? The GUNN is of much stronger construction and a smaller windload so I'd rather put it up, but the short boom makes me wonder if the gain and rejection numbers are suspect. Any help would be greatly appreciated, antenna choices, price tags and urls below. 73 Stan MACO-Shooting Star $279.95 http://www.mpaudio1.com/Macobeamantennas2.html JO GUNN 3 + 3 STAR $382.00 http://tinyurl.com/6hzteu Oh btw, I'll be tower mounting it about 40' from the ground and turning it with a hamIV rotator. Thanks again. |
11 meter beam
On Thu, 17 Jul 2008 18:11:58 -0700, "998cc"
wrote: Stan, just go with what you like. I too am suspicious of claimed gain by manufacturers. I will also throw in a plug for getting your ham license. It costs very little to get your license, and it opens many new adventures far and above 11 meters. You can work the world on 100 watts and a wire strung between a couple of trees. Try the practice tests on QRZ.com. 73. Russ W6OHM "Stan Cooper" wrote in message ... Hello I hope I'm not intruding by asking for advice on a CB antenna but I figured this would be the group to ask about such things for the straight scoop. At any rate I'm considering a store bought beam with both vertical and horizontal polarization and my choices are limited to these two below. (not many being manufactured anymore) The Maco has a 16 foot boom and an advertised gain of 12.5 db, while the JO GUNN has an 8 foot boom and an advertised gain of 14.5 db. I know there is a lot of smoke and mirrors involved with advertised gains and so my question is...is it possible for the JO GUNN to perform as well as the Maco antenna? The GUNN is of much stronger construction and a smaller windload so I'd rather put it up, but the short boom makes me wonder if the gain and rejection numbers are suspect. Any help would be greatly appreciated, antenna choices, price tags and urls below. 73 Stan MACO-Shooting Star $279.95 http://www.mpaudio1.com/Macobeamantennas2.html JO GUNN 3 + 3 STAR $382.00 http://tinyurl.com/6hzteu Oh btw, I'll be tower mounting it about 40' from the ground and turning it with a hamIV rotator. Thanks again. Sorry 'bout the blank. I knew if i just kept reading i would find something like QRZ.com |
| All times are GMT +1. The time now is 08:50 PM. |
Powered by vBulletin® Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
RadioBanter.com