Short 80 Meter Antenna

3:1) on 80m and 40m, and below 3:1 on 20, 15 and 10m. On 80 meters the inductance in the traps allows each antenna leg to be only 50 feet overall length to be electrically resonant on 80 meters. So I am using a “picnic table portable” application of the W3EDP antenna for this study. 80/40 Meter Attic Antena I live in a tightly packed urban neighborhood without much room for antennas. I must say that I am impressed, and here are some numbers. The orig­i­nal Jet­stream Multiband 80 - 10 Dipole nev­er had cov­er­age of th­ese bands. 5 meters comes out to about 16 feet. If you live on a farm and have lots of time and money to spend on your low band antennas, congratulations… For everyone else, an antenna on the 80 meter band will be a major compromise compared to what we might have for other bands like 10 meters. Although Beverages are typically at least one wavelength long on the lowest band, even a half-wave (or even shorter) Beverage antenna can very often out-hear any vertical, dipole, or loop. And now we have an antenna that tunes from 3. MODEL 807-xx In addition to being erected in its full length, all 807-xx antennas can easily be shortened to half-size and erected as a 40m OCFD, still covering 7 bands. Question, thoughts on a 33 foot vertical with a loading coil for 80 meters. As anticipated this antenna has a limited 2:1 SWR bandwidth on the 80 meter band (about 90KHz). This 80 Meter Short antenna with a 1:1 balun, is the simplest single band short antenna. That is a lot shorter than a standard 1/4 λ vertical. Anything less than 75% of full-size is actually a real compromise. Although the radial system is far from ideal, the inverted "L" has been able to gather both local and DX contacts on 80, 40, 20, 15, and 10 meters. deemed mandatory. 95 (1 new offer). Anything shorter becomes a challenge to match on the upper bands and increases the chances of the feedline becoming the radiator and a source of RFI. SWR is also somewhat dependent on the height above ground. Some are expensive tunable screwdriver arrangements. Dipoles need to be half a wavelength long, locating these long antennas can be an issue, especially when we are aiming for the 80 metre band or lower. The antenna has a full 300kHz bandwidth on 80m between 3:1 SWR points. This one is really a loading coil to make up for the physcilally short antenna length. If you want 75 Meter operation make it 57 ft long. The large diameter yields broadbanded coverage of the 80 Meter Band. This antenna configuration produces a high angle of radiation, consists of a loading coil in each leg resulting in n. 80/160m Shortened Dipole Trap Questions. PICTURES from the GARDEN. This projects was developed as a result of experiments to become QRV on 80 meters, again, using the little balcony. Pedestrian mobile magnetic loop antenna for 40 to 10 meters. Mismatched operation will generally be accompanied by considerable loss, with most of the stress concentrated in the matching transformer. I don't know how well it is working but i made 4 contacts on 80 meters last night. Probably a better idea to think out side the square fit up a minesite bar with the hi mount brake indicators etc -wire them up so they work, and use this as a antenna mount instead. The plan for this antenna was to build a lightweight 80/40 meter antenna for field use (as part of my Go Kit) that wouldn’t overload my 21 foot telescoping fiberglass mast. Obviously, the antenna was a little long on both 40M and 80M. While this antenna is technically a little short for use on the 80 meter band, it will tune on that band along with all of the remaining HF ham bands (except 160 meters). 3:1) on 80m and 40m, and below 3:1 on 20, 15 and 10m. On 40m it is a 2x wave length open loop or Bi-Square. Assemble the DXE-UWA8X-KIT - Universal Wire Antenna Kit for RG-8X per the instructions supplied. Kuhn Rikon SoftEdge Slotted 12-Inch Spatula, Red, Set of 2 705475276027,Monkey Made MM9 CB Radio Antenna, Short Shaft, 18FT BELDEN COAX, BRACKET & STUD 655222916655,3D Trees Grassland 04 Tablecloth Table Cover Cloth Birthday Party Event AJ Jenny. KN5L Field Day Vertical Antenna. Well, almost all, people forget that when the G5RV was designed the ONLY bands it was meant to be used on was 80, 40, 20, and 10. However, you may find that your mono band delta loop may tune up on it's second harmonic at a higher frequency eg. In one of my recent posts, I described an inverted "L" antenna I built for 80 meters--a band I find difficult to use because of my restricted space. A signal level meter can be easily made from a DC microameter and a germanium diode. This multiband vertical designs provide 9 band coverage encompassing the 6, 10, 12, 15, 17, 20, 30, 40 and 80 meter bands. The GM3VLB "Special" - a short multi-band vertical antenna: See also the GM3VLB Multi-Band Inverted-Vee Dipole the GM3VLB Mini-Delta the SCOTIA Bandhopper Multi-Band Mobile the SCOTIA Poor Man's Antenna Analyser and the GM3VLB Expedition Equipment List. My Account. short 17 meter dipole antenna. Using the popular trap-type antenna on 75-80 meters, the overall length usually exceeds 100 feet with an extremely narrow operating frequency range. dipole antenna author stream. 8 15 & 17 meters swr 2. With a short 6ft counterpoise I have had great sucess with South Africa wide QSO's using 5 watts transmit power. Government. Tune two hamsticks with an antenna analyzer. Low Band Antennas at W3LPL 80 Meter Transmitting Antenna Arrays of short active verticals All receiving antenna dimensions in this presentation are for. This antenna is up at 140'. An inverted vee with a 40-foot (12 m) apex elevation requires only 115 feet (35 m). This page was my first 80 meter inverted vee page, created several years ( September 2002) before I added the remaining pages. The Horizontal Loop, also known as the Loop Skywire Antenna, is an old but very effective design. A dipole fed with 300 ohm feeder can be used on all short wave bands. 8 into 468 gives 123. The antenna was never very well tuned on any specific band, but it managed pretty well on 30 and 40 meters with either built-in or external tuners in the shack. For details, please visit our Products section. 80m Shorty Double Bazooka Antenna- A DOUBLE BAZOOKA antenna is an extremely broad-banded Half Wave Antenna that can operate efficiently across an entire Ham band with little change to the SWR. A physically short broad-bandwidth multiband vertical antenna with 50 ohm input impedance and 25 foot square footprint for 160, 80, 40 and 17 meter radio bands. For many ham radio operators, it is not feasible to put up a a full length dipole on HF. The Ultimate Solution for Hams with Antenna Restrictions. A short dipole for 80 meters A short dipole for 80 meter The antenna above has been described by Nadisha, 4S7NR and may be of interest to anyone wishing to get on 80M (3. Antena para 80/40 metros, bobinada e de alta performance Antenna for 80/40 meters, traps and high performance: Duoband antenna for 80 en 20 meter, ON9CVD the antenna has been modeled at 10 m. 160 Meter Dipole Antenna at W5JGV. Yes, I’ve had lightning hit an antenna and yes I had to repair some damage. The antenna shown covers 80, 40, 20 and 10 meters with 15 meters and WARC bands only available with an antenna. K5WZ Antennas are a product of RFLABS. It is a half wavelength long (10 meter) I put up the antenna between the rain showers and it looks like I had no antenna for 20 meter before. Time will tell how this effects local Tx/Rx on 80/75 meters however DX should improve some. 8 MHz, dividing 3. 80/40 Meter Attic Antena I live in a tightly packed urban neighborhood without much room for antennas. Read his comment here. 15 Stainless Conductor Wires. For a compromised antenna system, it performed as well as my 80 meter inverted vee. I like to use a home made current choke to keep RF from coming back on the feedline. EZNEC reports the SWR on 80 meters at about 50:1 (using 450 ohm line). While this antenna is technically a little short for use on the 80 meter band, it will tune on that band along with all of the remaining HF ham bands (except 160 meters). Overall length is 40 ft. A Stealthy HF Coat Hanger Antenna. At the lower frequency the trap acts as a loading coil and efficiency drops off as a result. Unfollow 80 meter antenna to stop getting updates on your eBay Feed. Fig 1—Broadbanding an 80-meter dipole. The 9:1 transformer provides: 1. meters and an 80 meter center-fed Zepp on 80, 60, 40, 17, and 12 meters. Guy wires 1mm and 2mm Kevlar ropes. To calculate the needed connecting cables required for sending the signals from each antenna to the center controller one can use the following formula. I think many hams that do their own antenna work will get a bang out of these photos. I needed to take about 2 feet off the horizontal section to get mine resonant at 1830. The ANC-4 has a “noise antenna gain” adjustment but it does not have enough gain on 160 and 80 meters to boost the noise from my noise antenna sufficiently (my noise antenna is short for 80 and 160 meters) to be equal to the noise. Forum discussion: Is it me or is 80 meters just the most unfriendly place on the bands. I could transmit with it by using an antennatuner. This antenna is an excellent performer, and ruggedly built. Improving Your 160 and 80 Meter Antennas for the Declining Solar Cycle to a very high 80 meter horizontal antenna. how high for a inverted v dipole for 10 meter. MFJ-2982 Feather Lite HF Vertical Wire Antennas are 31 ft. to 80 miles or more with 6 meters • Line of sight communications are fairly allowing 160 and 80 meter signals broadcast, etc. Today we will feature one product of interest. Dipoles need to be half a wavelength long, locating these long antennas can be an issue, especially when we are aiming for the 80 metre band or lower. Our 80-meter off center fed antenna is a very efficient and effective multi-band antenna. HF Automatic Link Establishment. An 80 meter dipole (3. I added 9 meter of wire to each end, and cut to resonance. Modeling this 160 meter inverted-L in EZNEC shows surprisingly useful patterns and gain on most HF bands above 160. So that means that the I-MAX 2000 is a 5/8 wave antenna on 11 meters, (27MHz CB band) as advertised. The AS-2259/GR may be used with tactical hf radios that tune a 15-foot whip antenna, such as the AN/PRC-47. Short dipole for 60 meter Tropical Band By Enrique A. I have used several different short Beverages and can testify to their usefulness. It gave me 40, 20 and 15 with a push because although a 40 meter dipole should give you a resonant 15 meter antenna, in this case - with the coils for 40 - it mucked the maths up and caused the ATU some trouble. With this antenna (mounted vertically) I easily work transatlantic on 80m. For both 160- and 80-meters, the unun secondary taps into the inductor at the 200 ohm point giving a proper match to the unun on these bands. I needed a second antenna for experiments and dual monitoring. duoband antenna for 80 en 20 meter (published in Electron #7-1999, Radcom #10-1999 and Antenne Compendium #8) Introduction. That is a lot shorter than a standard 1/4 λ vertical. Also, a decreased noise level of that antenna was noted in the reception mode, probably due to a short-circuited matching transformer. 3 I use the auto tuner Same for 10 meters swr 2. for the 160 Meter Band. For the last 35 years or so I have been a 40 meter CW specialist for Field Day. I have been using the EFHW10-80 for approximately 18 months, and all I can say is that it is the best wire antenna around. The parallel circuit used here was chosen because the antenna is so very small, its radiation resistance so very low on 160m. An Attic Coaxial-Cable Trap Dipole for 10, 15, 20, 30, 40, and 80 Meters John DeGood, NU3E [email protected] Placement: Hang as freely as possible. A Portable NVIS Antenna. If you want 75 Meter operation make it 57 ft long. Super-strong injection-molded center insulator with built-in SO-239 connector and hang hole. As anticipated this antenna has a limited 2:1 SWR bandwidth on the 80 meter band (about 90KHz). With "short" I mean between 3 and 10% of λ. Antenna gain is measured in either dBi or dBd. This multiband vertical designs provide 9 band coverage encompassing the 6, 10, 12, 15, 17, 20, 30, 40 and 80 meter bands. After mounting the TRAP's to 160 meter, the 80 meter band had a little change. HORIZONTAL LOOP ANTENNA CONSTRUCTION. The length of a loop best suited for operation on 160 meters is too short for use on the higher bands. I chose 58' for Mid 80 Meter Operation. 80 Meter Off Center Fed Dipole sometimes known as a Windom, if DX is your goal then RADIO WAVZ brings you new technology at an affordable price. Short antennas for 160 meter radio pdf Wavelength makes antennas more difficult. The plan for this antenna was to build a lightweight 80/40 meter antenna for field use (as part of my Go Kit) that wouldn't overload my 21 foot telescoping fiberglass mast. Sign up for our monthly newsletter to receive promotional coupons and stay up to date on sales! Submit. (Tip – if you cut it a bit short you can solder extra wire on). Using a tuner near the transceiver with a coax fed too short antenna is not the solution. Enjoyed the article. 5/5click here to see their performance reports. With "short" I mean between 3 and 10% of λ. 66 in total. With a little adjusting of the ends I have better results than I expected. Since I now have a resonate antenna for 40 20 and 10 meters I shortened up the lenght of the inverted L until i found a resonate spot in the lower portion of 80/75 meters that would allow me to bypass the tuner when operating within that window of the band. Minimizing the Dreaded Drift of MF or LF October, 2016 by Rick W7RNB / WI2XJQ. I like to use a home made current choke to keep RF from coming back on the feedline. Also, a decreased noise level of that antenna was noted in the reception mode, probably due to a short-circuited matching transformer. 12 meters is like 1. AB0X Roof Loop 2. If you can double the length of the antenna, it will be more efficient, but you will probably have better results switching to a series resonant circuit as used in the MB-80. After mounting the TRAP's to 160 meter, the 80 meter band had a little change. The quality workmanship is far superior than others. On 80 meters I first used and inverted V G5RV, then an inverted V Alpha-Delta DX-LB ( 80 and 160 ) and finally a Hustler 6BTV for 80 meters. They will provide trouble-free operation for many, many years Find MFJ 1779B 80 or 40M Single Band Dipole Antenna Kits MFJ-1779B and get Free Standard Shipping on orders over $99 at DX Engineering!. 6 m) works quite well and still allows operation in the upper end of the 75 meter band. The result is the same as having the relay contacts in the 40 meter position, as shown in Figure 1. I have also worked close to 500 digitals contacts also on 40/80 meters. The two reasons: 1) the radiation pattern is optimal. The 40 Meter Isotron Antenna. 6 Element Yagi 6-20 Meters DX. Fig 1—Broadbanding an 80-meter dipole. It is basically an 80-meter dipole fed by a length of 450 ohm ladder line into a balanced antenna tuner. A short dipole for 80 meters A short dipole for 80 meter The antenna above has been described by Nadisha, 4S7NR and may be of interest to anyone wishing to get on 80M (3. Cushcraft achieved a major breakthrough in the development of an HF multiband vertical antenna that has been specifically de. 8 15 & 17 meters swr 2. A conventional coax-fed, half-wave dipole doesn't provide a low SWR over the entire 80-meter band - an inconvenience for those of us who like to operate phone and CW on that band. A variable or switched inductor in a separate tuner, rather than a fixed coil at the base or part-way up the antenna, also assists multi-band operation. Short dipole for 60 meter Tropical Band By Enrique A. 7-strand, #14 gauge hard copper antenna wire. First, note that I will use the 160-meter band for all the antennas in this article. Although the radial system is far from ideal, the inverted "L" has been able to gather both local and DX contacts on 80, 40, 20, 15, and 10 meters. How to build a mono band 80 meter 1/2 wave wire antenna. higher R loss. This 80 Meter Short antenna with a 1:1 balun, is the simplest single band short antenna. I have used several different short Beverages and can testify to their usefulness. Find great deals on eBay for 80 meter dipole and 160 meter dipole. Using the popular trap-type antenna on 75-80 meters, the overall length usually exceeds 100 feet with an extremely narrow operating frequency range. Placement: Hang as freely as possible. This feature is not available right now. Sign up for our monthly newsletter to receive promotional coupons and stay up to date on sales! Submit. I needed a second antenna for experiments and dual monitoring. Stub Tuning a CB Big Stick Antenna for 10 Meters - Ham Radio: Many long years ago, when I was just a pup, I purchased a Shakespeare 'Big Stick' CB antenna. But on 10 meters, it works out to a sweet. Short of simply pressing “TUNE” on my rig’s internal antenna tuning system and living with the high SWRs, I really wanted to try something a bit more… shall I say… clever. Shop with confidence. The unique design characteristics of this 10-160 Meter HF JPole antenna enables it to approach resonance on the major HF bands (10/12/15/17/20/40/80 Meters), all of which presents an SWR that is low enough for external tuners to achieve a near perfect match, including 160 meters. Using a 160 meter full wave loop in that fashion is likely to be counterproductive. 80 3 DXE-ECL-040 Element Clamp for 5/8 in. For many ham radio operators, it is not feasible to put up a a full length dipole on HF. This calculator was adapted from the Coil-Shortened Dipole Antenna Calculator. Her is all 3 antennas in one sweep. As for 160 meters, consider it lost. A shortened multi-band End-Fed Half Wave (EFHW) antenna for 80-10m The 80-10m EFHW This is a shortened multiband antenna, about 23m long, for 80m-10m that offers low SWR (1. Modeling this 160 meter inverted-L in EZNEC shows surprisingly useful patterns and gain on most HF bands above 160. Since I now have a resonate antenna for 40 20 and 10 meters I shortened up the lenght of the inverted L until i found a resonate spot in the lower portion of 80/75 meters that would allow me to bypass the tuner when operating within that window of the band. Five Band Vertical Antenna 10, 15, 20, 40, 80 Meter. It is good for medium range contacts. I have less tha 1. I wanted high efficiency 40 Meter antenna with low-angle radiation. In the drawing above, it is shown for just four bands, 80 thru 10. 80 Meter Antenna? So, what about 80 meters? This question presented quite a dilemma. So far received 3 votes for a total score of 4. 80m Shorty Double Bazooka Antenna- A DOUBLE BAZOOKA antenna is an extremely broad-banded Half Wave Antenna that can operate efficiently across an entire Ham band with little change to the SWR. 160 Meters: 1. It is an end fed dipole but this one can be used up to 300 watt. On 20 meters the SWR is considerably less - about 13:1. Full Size Quad Loop 2. Designed as a high-angle radiator for 80 meters, and a medium-angle radiator for 40 meters, the antenna correlates predictions quite well. The DOUBLE BAZOOKA SHORTENED INVERTED-L antenna will handle full legal limit power with no effect to performance. I wound this on to the fishing pole which gave me 6. This 80 Meter Short antenna with a 1:1 balun, is the simplest single band short antenna. 0 out of 5 stars 1. This matchbox is good for this type of antenna. But fear not! In the article below, we'll recommend what we consider to be the best CB antennas on the market today as well as explain the fundamental principles you need to understand to pick the right antenna. Short antenna so it looks longer to. Cart is Empty. That weekend was the CQ WW DX test on CW. Antennae for the Low Bands. They are not just for amateur radio operators. Read his comment here. I choose the Titan DX mainly based on the reviews on eHam. 49 + 6 = 55. Since it is a shortened HI-Q antenna on 80 meters, it has a narrow SWR bandwidth of about 65-70 kHz. 80 Meter Off Center Fed Dipole sometimes known as a Windom, if DX is your goal then RADIO WAVZ brings you new technology at an affordable price. The length of a loop best suited for operation on 160 meters is too short for use on the higher bands. So that means that the I-MAX 2000 is a 5/8 wave antenna on 11 meters, (27MHz CB band) as advertised. My back fence is 50 ft from the rear of the house and not enough room on the property for 80 meter wire antenna must less a 160 meter one, and this to work great with the sloper wire attached to a fence, I also use monofilament (non-conductive) line like fishing or Weed Eater line as support for the PVC tubing on the top of my house. They will provide trouble-free operation for many, many years Find MFJ 1779B 80 or 40M Single Band Dipole Antenna Kits MFJ-1779B and get Free Standard Shipping on orders over $99 at DX Engineering!. 8 MHz, dividing 3. Considering the limitations of my property in terms of the size and height (around 30 feet) of the antenna, I couldn't be happier with it so far. This antenna height is very low, compared to the 80 mtrs wavelength. Modeling this 160 meter inverted-L in EZNEC shows surprisingly useful patterns and gain on most HF bands above 160. 25" OD pvc pipe with 17 wraps total length of the antenna is 78' 6". Buy your Usa L2 on the internet. Need a really simple antenna for better indoor 2 meter operation? Try this vhf delta loop you can hang in any window. 95 (1 new offer). This 40 and 80 meter inverted V antenna is made with loading coils. Each American made antenna covers a single HF band with a power rating of 250 watts P. 7 meters (tip of antenna). Free Worldwide Shipping. The Jackite vs Ebay pole comparison showed you how you can spend a few bucks and get a good single or dual band HF antenna. Short Dipole Antenna for 40m - 80m - 160m. Whatis(aWindom(• Itis(an(offAcenter(fed(dipole(and(can(be(constructed(as(a(mulFband(antenna. My last vertical antenna experience relevant to the Hex Array came from the MFJ-1792 antenna. But fear not! In the article below, we'll recommend what we consider to be the best CB antennas on the market today as well as explain the fundamental principles you need to understand to pick the right antenna. Handles 1500 Watts. The plan for this antenna was to build a lightweight 80/40 meter antenna for field use (as part of my Go Kit) that wouldn’t overload my 21 foot telescoping fiberglass mast. Others are single band such as the Hamsticks. 80/40 Meter Attic Antena I live in a tightly packed urban neighborhood without much room for antennas. 00! Wow! These guys are making some good markup! Features of the K0WA 40 meter verticle. The antenna shown covers 80, 40, 20 and 10 meters with 15 meters and WARC bands only available with an antenna. This 80 Meter Short antenna with a 1:1 balun, is the simplest single band short antenna. • Just make the antenna short and feed it with a tuner! -This is a simple and direct approach but you have to accept the losses in the feedline and the tuner, i. Results on 80. My K9AY RX Antenna. For the entire 15 meter band will need a tuner. The Matching, Resonance and VSWR. The AS-2259/GR may be used with tactical hf radios that tune a 15-foot whip antenna, such as the AN/PRC-47. With that said, go look up the cost of one that is being sold in the magazines and on the web. even higher - within the range of 80 meters. Small Coaxial Loop 4. I calculated that I would need a coil with about 18 uh of inductance to cancel the capacitive reactance of the antenna which was of course too short for 80 meters. An excellent receive antenna for the lower bands is the Beverage antenna. The ULTIMAX-8040 broadband dual band double bazooka for 40 & 80 meters is a fantastic antenna using a newly designed "HY-Q" coax coils that gives outstanding broadband performance on both bands requiring only 103' feet of space. By John Portune W6NBC. AB0X Roof Loop 2. Turn your existing 80-meter dipole into a broadband antenna by simply modifying the feed line. On the 80 meter band, the same antenna has just a small amount less gain than a full size 1/2 wave length dipole at the same height. 3 swr at either end of the band 80 meters at 3. Improving Your 160 and 80 Meter Antennas for the Declining Solar Cycle to a very high 80 meter horizontal antenna. At just 67 ft you can hang it any where. With "short" I mean between 3 and 10% of λ. Made out of aluminum tubing Uses PVC as an insulator Is 32 feet high. 0 out of 5 stars 1. The physical length of any HF antenna is critical to achieving resonance and good performance on a particular band. With this antenna (mounted vertically) I easily work transatlantic on 80m. Top of article. 6 meter coaxial dipole. This keeps the unun. This is the price paid for multiband coverage and physical short- ening. If you want 75 Meter operation make it 57 ft long. Interesting details of the construction followed in building a variable wavelength antenna are illustrated above. 648 Mhz 3rd Harmonic Halfwave in space is: 136. Antenna For Low-Band DXing By Rudy Severns, N6LF 32857 Fox Lane PO Box 589 Cottage Grove, OR 97424 This article was orinally published in the ARRL Antenna Compendium Vol. The antenna was never very well tuned on any specific band, but it managed pretty well on 30 and 40 meters with either built-in or external tuners in the shack. My 40 meter vertical cost me $13. The counterpoise is off the ground only about 5 feet so the antenna is still ground mounted. 05 Mhz with a very large bandwidth, certainly better than the loading coil version. A dipole fed with 300 ohm feeder can be used on all short wave bands. Here's two new projects from the NØLX workbench. With proper feedline tuning, this antenna should have relatively good useful radiation for all bands (10 thru 160 meters). 25λ high, then a lot of the transmitted energy goes straight up. It reduces the overall length of the antenna by 40%. Just want to share my 80 meter antenna i just made. Frank's N4SPP Ham Radio home-built 80 40 20 meters short dipole antenna KGD kurz geratener dipol More information Find this Pin and more on Ham Radio - Antennas by Jim Shields. It's a dipole fed off center with a 4:1 current balun at the offset feedpoint. communication on 75 Meters was started with a dipole at approximately 30 feet. First, we should note the difference between antennas, masts and towers. TWO ELEMENT PHASED VERTICAL SYSTEM "Christman Phasing" by W4NFR 5-22-2011 I have always been curious about vertical antennas and how to make them efficient. As anticipated this antenna has a limited 2:1 SWR bandwidth on the 80 meter band (about 90KHz). * Works on 7 bands (6, 10, 12, 17, 20, 40, and 80 meters) * Great Short Wave Listening antenna. This antenna is 58 ft tall and is mounted on a hinged base. No further length adjustment will be needed. For many ham radio operators, it is not feasible to put up a a full length dipole on HF. Short 85 foot long dual band 80/40 Meter dipole antenna is full-size on 40 Meters and has ultra-efficient end-loading on 80 Meters. When -12V is applied, the short across the inductor is removed which resonates the antenna on 160 meters. To optimize the antenna for a frequency RANGE, do the calculations twice, once for the low end of the range and once for the high end; then average the two and plan to adjust the VSWR on both ends of the range. Describe your experience with the MFJ-17758 80/40 Meter Dipole Antenna and tell us why you give it the rating you did (required). and for vertical angles above 20-30 degrees. 160-meter Operation 80-meter Operation 43 ft Vertical. Short of simply pressing "TUNE" on my rig's internal antenna tuning system and living with the high SWRs, I really wanted to try something a bit more… shall I say… clever. Some people insist that [1005/freq in Mhz] is way too short and the factor should be closer to 1030. 160: The antenna could work on 160 meters with a suitable L network. The shunt capacitor (C1) reactance on 40 meters is roughly ten times that of the antenna’s base (feed-point) impedance and therefore has a negligible effect on match-ing. This link is listed in our web site directory since Friday Aug 24 2012, and till today "Short vertical antenna for 80 Meters" has been followed for a total of 1325 times. The original antenna was designed as a moderately short antenna for the 10 meter band. Here's a picture of the antenna. Time will tell how this effects local Tx/Rx on 80/75 meters however DX should improve some. I love the ability to. Small Coaxial Loop 4. Steve Nichols G0KYA Contents 1. It is probably more convenient to remove a small number of turns and add a very short straight rod or wire which can be more easily pruned. Any reuse or redistribution of the contents of this website are strictly forbidden without authorization from MFJ Enterprises, Inc. The small mast through the roof on the left supports the top wire to the house. The main category is Homemade projects for 80 meter Antennas that is about Antenna projects for 80 meters band. The AS-2259/GR may be used with tactical hf radios that tune a 15-foot whip antenna, such as the AN/PRC-47. This was done and now there are also two antennas--KDKA's long antenna which is 105 feet high and 200 feet long, used for broadcasting on 360 meters, and the short-wave antenna which is 35 feet high and 40 feet long, used, of course, for sending the 100-meter signals. This is particularly true at our fairly low 40 foot test height. During the PACC 2013 I used this antenna for 160 meters. On 80 it seems like it's filled. I have logged over 800 40/80 meter SSB phone contacts. The antenna well proved itself in operation. So what I've tried doing is using my 20 meter loop antenna as a receiving antenna for 75 meters. We are going to use an 80 meter ½ wave dipole for this discussion.