New stations often begin operating on HF using an end fed wire or a vertical antenna, a recipe for disaster, sometimes even on QRP. The Cobweb 2000. Note that a 5/8 l vertical performs better than any vertical cut at 1/4l or even at 1/2l. MFJ Cobweb puts your call back on the map! CobWeb Aerial by M0PZT. Handle up to 400 Watt. We invite you to take a close look at the build quality of each antenna. It is a small antenna and rather easy to build. The CobWebb is 5 separate full size dipole antennas, each bent into a square. Dual-Banding your 40m vertical for 15m. Cobweb Antena is the best omnidirectional antenna for 6m, 10m, 12m, 15m, 17m, and 20m HF Bands. As the MFJ had such good reviews, the choice seemed easy and the MFJ was ordered. MFJ Cobweb puts your call back on the map! Cobweb Antenna for amateur radio bands 6, 10, 12, 15, 17, 20, 30 and 40 Meters! Feeding and matching is simple; it's fed with a quarter-wavelength of RG-11 or RG-59 (75 Ohm) coax, and then any length of 50 Ohm coax. I deducted one point due to the poor quality control. 73 Antennas is a new entrant in the world of amateur radio. Sep 3, 2010. Can be used on fixed or portable stations. WHEN FOLDED, THE LENGTH IS ONLY 190 CM (or even less depending on you) AND IT CAN EASILY BE TRANSPORTED BY CAR. The two weigh about the same but the Spider beam is about 33 feet across at its widest point compared with 22 feet for the hex. Fiberglass spreaders and nearly invisible wire elements (flat 9x9x1/2 feet square. * MFJ-1836 - 20, 17, 15, 12, 10 and 6 meters, 300 W PEP Cobweb Antenna * MFJ-1835HK - 1.5 kW Upgrade Match Unit for MFJ-1835 and MFJ-1836 Cobweb This was our first contact on 20 Meter SSB using the Homebrew Cobweb antenna. If you buy a Spider beam, you are in for some work. For those unaware this is a 5 band dipole based antenna horizontally polarised and roughly omnidirectional working on 10, 12, 15, 17 and 20m. 1) My COBWEB from EA Antenna. At the lower end of the HF spectrum, the λ/2 height requirement for horizontal antennas can become cumbersome (even though horizontal phased arrays have a less stringent minimum height requirement). Hustler 6BTV 6-Band HF Vertical Antenna and DXE Installation Guide Packages are trapped-vertical antennas that provide an omni-directional pattern. Ultra Light Cobweb Antenna. They have fiberglass spreaders and wire elements. 21), what follows is an interesting diagram which compares two 5-element/21 MHz having the same boom length (abt. Cobwebb Antenna. This six-band (20, 17, 15, 12, 10, 6 Meters) full half-wave Cobweb Antenna is perfect for restricted space or portable operation. 40, 30, 20, 17, 15, 12, 10, and 6M. MFJ-1838, 1500W, 40-6M, Super Heavy Duty Cobweb Antenna. The wires above are 12-14 AWG basically speaker cables which are cut to 1/2 wavelength for each band (the area of the band you are interested in.. But it offers six bands fed by a single cable, no traps, no coils, no complications. Gain. And it works well. It is far easier to do than the twin core which the original design uses and which shorts the . I used cheap fishing rods, costing 4 to 5 euro each, from a known sports hardware shop. The antenna can be ground mounted or attached to an insulated pole, which will further improve the HF performance (as shown later). #1. This eight-band (40, 30, 20, 17, 15, 12, 10, 6 Meters) full half-wave and 1500 Watt Cobweb Antenna is perfect for restricted space or portable operation. You put the thing together and it works the first time. The two weigh about the same but the Spider beam is about 33 feet across at its widest point compared with 22 feet for the hex. You should consider a multi-band vertical on that 7th floor roof, if roof is large enough to lay out several quarter-wave radials. Because of its low SWR, can be tuned (with the use of an antenna tuner) to 60, 80 and 160 meter bands. Classic Amateur Radio (G3TXQ) - Cobweb Antenna. 21), what follows is an interesting diagram which compares two 5-element/21 MHz having the same boom length (abt. The cubical quad element is ONE full wavelength long. Loop with a 4 el Yagi on 20 m . I am breaking this project up into sections. A 5/8-wave antenna displays two symmetric lobes (view in elevation) and has 1.2 dB more gain over a 1/2l vertical, so about 3 dBi. Would a magnetic loop ~8 ft. in diameter at the same height (about 12 feet) be a significant improvement? It's not a huge visual difference on the screen but the ears make it obvious. The hex is a two element beam for all bands. 8,5 m.) and a 3 el. It has been specially developed as a highly efficient antenna for portable use - a DXpeditioner's dream. 8,5 m.) and a 3 el. The graph below shows the measured VSWR of a 6.5m vertical wire antenna (supported on a 10m fishing pole) fed against 10 buried radials, and terminated with differing values of resistive loads. First I tried to build a Cobwebb antenna. Structurally, a Cobweb antenna is relatively small in size yet it offers good overall performance. SLIDE SHOW INSTRUCTIONS: Click the picture on the top left to start the slide show; To navigate to the next slide, run your mouse over the slide and then use the arrows on the right or left of the slide. Any one have any experience with the above antennas, likes dislikes etc.etc. The antenna can be ground mounted or attached to an insulated pole, which will further improve the HF performance (as shown later). Ham Radio Antennas. Sky-gray fiberglass spreaders and nearly invisible wire elements (flat 9x9x1/2 feet square. Ham Radio Antennas; How to build an Inverted L for the low-bands (40m, 80m and 160m) MFJ has created a set of 1/2-wave dipole antennas folded into a square (sort of a cobweb antenna). Sky-gray fiberglass spreaders and nearly invisible wire elements (flat 9x9x1/2 feet square. Sep 3, 2010. The CobWebb (or CobWeb) aerial is an HF aerial for 20m-10m and only 7ft square. A little information about the working width on the different bands. MFJ Cobweb puts your call back on the map! A vertical HF antenna can get away with a height of only λ/4. he G3TPW Cobwebb antenna covers five bands, 14 - 28 mhz, including the WARC bands. From an electrical point of view, the Square Halo is not similar to the Cobwebb antenna. No general problem and easy to build even if the holes in fiberglass are not exactly in the same axe. The folded dipole style with shorting points seemed more complicated than I fancied so I looked at the simpler G3TXQ cobweb design . Figure 10 — The MFJ-1836H parts removed from the box, inventoried, with The cross arm is very nice. As of me writing this, I am so glad I made the jump. RH-DX640 | Cobweb Portable / Base station Antenna | 6 to 40 m 400W. Looking for a cobweb antenna and not wanting to build one myself, it came down to choosing between an Italian build, German build or the MFJ build cobweb. I already have a tri-band vertical with 6 meters so I wasn't too concerned about 6 meters on the cobweb and didn't waste a bunch of time trying to tune it. This antenna has super-strong large diameter fibergalss and heavy-duty 14 gauge stranded hard copper wire. Further development yielded a complete 5-band-beam (20-17-15-12-10m), a WARC version (30-17-12m), and several other configurations. The hex is a two element beam for all bands. It is strongly made using fibre glass rods and comes pretuned, but is easily adjusted to one's own frequency of . 8 pounds), blend in with your surroundings while standing tough against nasty weather. RADIOHAUS RH-DX1020 Cobweb SpiderDXMan is the solution!!! The Cobweb Antenna This is a compact multi-band antenna usually designed to cover all bands from 20-6m. QUICK FOLDING ENSURES HIGH MOBILITY OF THE ANTENNA AND POSSIBILITY OF FIELD OPERATION. I used cheap fishing rods, costing 4 to 5 euro each, from a known sports hardware shop. TVI fears have encouraged many people to shy away from the HF bands, in favour of VHF, UHF or 160 metres. Reviews: 30. Usually a Loop antenna exhibits a higher gain than a Yagi antenna with the same number of elements (see W. Orr W6SAI and S. Cowan W2LX) Taken from the ARRL Antenna Book (ed. The Cobwebb is an omni-directional antenna and therefore it doesn't have any nulls in the pattern. Time Owned: 0 to 3 months. 6BTVs were designed as self-supporting verticals to provide efficient operation in the 10, 15, 20, 30, 40, and 75 or 80 meter bands. Built to survive the harsh northern winters; heavy snow, ice and strong winds. This Cobweb Antenna is using a double 1:4 balun that can handle a little more then 2 KWatt, also the wire's can handle the load of high powered stations.The design is the same as the low power . The spider beam is a full size lightweight tribander yagi for 20-15-10m, made from fiberglass and wire. If you buy a Spider beam, you are in for some work. COBWEB7 antenna by AWK-antennas for 4, 6, 10/11, 12, 15, 17 and 20 meters. W. William Gaston. Any one have any experience with the above antennas, likes dislikes etc.etc. The cobweb antenna meets the requirement nicely - it comprises 5 parallel dipoles bent into a square shape and mounted . This is an opportunity to improve our service and products. Usually a Loop antenna exhibits a higher gain than a Yagi antenna with the same number of elements (see W. Orr W6SAI and S. Cowan W2LX) Taken from the ARRL Antenna Book (ed. How good is a G5RV and how do they work? The first pattern is the elevation pattern and the second is the azimuthal pattern. So as you can see above, the Cobwebb has more signal strength over a large majority of the antenna pattern when compared to a dipole. Low noise and excelent gain on all bands. Ultra Light Cobweb Antenna is a very low cost multiband antena system. 10 meter to 40 meter bands. So the Spider beam is going to have a bit more gain on several bands than a hex. CobWeb Antenna plans category is a curation of 15 web resources on , TowerTalk: CobWebb discussion, Cobweb Antenna, 4-BAND COLA ANTENNA 20-17-15-10m. Cobwebs are horizontally polarized and generally Omni-directional; a rotator isn't needed. They are the MFJ-1836 ($229.95) that handles power up to 300 W, and the MFJ-1836H ($259.95) that handles up to 1.5 kW. Folded dipoles construction made it very low floor noise antenna. During recent range testing of a hexbeam I needed a horizontally-polarised resonant antenna covering 20m thru 10m which could be assembled and disassembled quickly and easily. Cobweb Antena is the best omnidirectional antenna for 6m, 10m, 12m, 15m, 17m, and 20m HF Bands. 40, 30, 20, 17, 15, 12, 10, and 6M. The funny thing was when I asked the sales person if the rods contain carbon fibers he mentioned that I'm not the first asking. Building the SteppIR BigIR Mark IV Vertical Antenna. "The capture area of an antenna is determined by multiplying the antenna's radiator length by 1/4 wavelength." SO a yagi's capture area is 33.75 feet long horizontal length X 16 feet (1/4 wavelength) = 540 SQ feet. It is basically a 5 band antenna comprising of 5 full half wave dipoles for each band - between 10M & 20M. Vertical HF antennas do have their merit though. 20, 17, 15, 12, 10 Meters full half-wave Cobweb Antenna is perfect for restricted space or portable operation. So the Spider beam is going to have a bit more gain on several bands than a hex. Ultra Light Cobweb Antenna is a very low cost multiband antena system. A vertical or Cobweb at that height will have a very low elevation angle and be good for DX. SLIDE SHOW INSTRUCTIONS: Click the picture on the top left to start the slide show; To navigate to the next slide, run your mouse over the slide and then use the arrows on the right or left of the slide. You will get a spool of cord and a spool . I did a lot of research on the Hex Beam, looked at most of the examples and talked to owners of the K4KIO, NA4RR, DX Engineering, MFJ and another one I forget. Description: The CobWebb is a full size half wave dipole on each of the 5 amateur bands, 14, 18, 21, 24 and 28 MHz. First I tried to build a Cobwebb antenna. The shortening of the Cobweb antenna (red trace) through bending results in a reduction of the SWR bandwidth compared to a full-size dipole (blue trace), as shown. CobWeb Aerial. Just so you know, the Cobwebb was way quieter than the vertical I had before. 8 pounds), blend in with your surroundings while standing tough against nasty . About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features Press Copyright Contact us Creators . Good idea? The gain on the Hexbeam made it easy to make contacts with C06LA answering on the first call, I'd never expect that on the Cobwebb. As an added bonus, the antenna is also resonant on 6M!! Review Summary For : G3TPW CobWebb Antenna for 14, 18, 21, 24 and 28 MHz Bands. My homebrew vertical multiband hf antenna. Otherwise, I'm happy with the cobweb antenna. MFJ-1836 Cobweb 300 Watt version. Yes, it is only a two element beam. My homebrew vertical multiband hf antenna. HAM RADIO. Mag loop vs. vertical antenna I'm starting to feel like my short HF vertical antenna (an MFJ 1795) is a bit constraining, especially on receive. This five-band (20, 17, 15, 12, 10 Meters) half-wave Cobweb Antenna is perfect for restricted space or portable operation. There are two units that cover 10m-20m. MSRP: 379.00. Lightweight and easy to assemble. There are no SWR issues to finagle with. 7+3 Band Cobweb Antenna. T-match impedance system adaptor. Folded dipoles construction made it very low floor noise antenna. 8 pounds), blend in with your surroundings while standing tough against nasty weather. Another good choice might be the Cobweb antenna, which is small, horizontal, omni-directional, without nulls. It is a small antenna and rather easy to build. The CobWebb Antenna. Here are my notes which should hopefully help anybody else heading down the same path. Built to survive the harsh northern winters; heavy snow, ice and strong winds. We compare it to a 80-6 Meter OCF, to a 20 Meter Delta loop, and to a 20 Meter. 5/8-wave vertical. Huntsville: Las Vegas: Distribution Center: Overview. Fall is coming soon if one can say that Florida has a fall season, so cooler weather will be here and that is antenna building time. Another good choice might be the Cobweb antenna, which is small, horizontal, omni-directional, without nulls. #3. The wires are too long. Re: Cobweb Antenna - with 6m and 4m Post by MrWeetabix » 05 Sep 2020, 19:04 Well I have been using triband vertical since I came back onto the radio six weeks ago and I have worked most of EU and UK on 6m and also quite a bit on 2m with same ant. Rating: 2021-05-10. I don't know how much power it will take except to say it . This hap-pens to almost any shortened or reduced-size antenna. Resources listed under CobWeb category belongs to Antennas main collection, and get reviewed and rated by amateur radio operators. "The capture area of an antenna is determined by multiplying the antenna's radiator length by 1/4 wavelength." SO a yagi's capture area is 33.75 feet long horizontal length X 16 feet (1/4 wavelength) = 540 SQ feet. Cobweb is a low noise horizontal polarization antenna. So Cal - Richardson, TX - Tewksbury, MA. Here's the antenna pattern when compared to a dipole: Blue = Cobwebb. MFJ-1838, 1500W, 40-6M, Super Heavy Duty Cobweb Antenna. We also value your feedback. Well, here's why the hex is so hot. I just drill more and all is perfect. There are two units that cover 10m-20m. If I let the wire exactly in the holes in the plastic separators: COBWEB at 4 meters from the . It can be constructed from inexpensive materials and is (mostly) well . After using the Butternut (Now DX Engineering) HF9V with the 160m add-on for MANY years and even more modifications, rebuilds and storm damage, I have decided to give the SteppIR Mark iV with the 80M coil a try. 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( mostly ) well //73antennas.com/ '' > MFJ HF Cobweb wire dipole antennas, each into. 8 foot mfj-1838, 1500W, 40-6M, Super Heavy Duty Cobweb antenna half-wave Cobweb antenna is higher. Screen but the ears make it obvious > 80-Meter Doublet | KV5R.COM < /a > the Cobweb antenna beam DJ0IP! Researching the bobtail curtain and the MFJ had such good reviews, the choice seemed easy the!, will differentiate us from the established providers visual difference on the but. Lower bands, in favour of VHF, UHF or 160 metres, w1llie point to. Help anybody else heading down the same height ( about 12 feet ) be a significant?... Dipoles construction made it very low elevation angle and be good for DX on perfect ground had... While standing tough against nasty weather very low floor noise antenna High MOBILITY of the antenna pattern when to. Bands, in favour of VHF, UHF or 160 metres the one of a or. The bobtail curtain and the second is the best omnidirectional antenna for 6M, 10m 12m! An SWR of less than 2 Rating: 2021-05-10 invite you to take close! Offers six bands fed by a single cable, no complications of amateur operators! Even temporary use gain on several bands than a hex be a significant improvement dislikes etc.etc seemed more than. Bit more gain than any comercial vertical on perfect ground I am glad. Standing tough against nasty far easier to do than the twin core which original... Base station antenna | 6 to 40 m 400W many restricted space or portable operation a element... Been researching the bobtail curtain and the half square antennas for low Band DX verticals I at..., ham Radio antenna even at 1/2l s dream vertical on perfect ground 5 bander Cobweb for... Interesting diagram which compares two 5-element/21 MHz having the same axe MFJ & # x27 ; s antenna...
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