requires a good ground or counterpoise (usually the car body), . So a 100 watt transmitter fed into a 34 ohm antenna will result in 1. I used this online calculator for exact theoretical lengthshttpsm0ukd. For instance you might be operating from a public place like I often do from local beaches. 20-30 ohms for hamsticks between 40 and 15m is normal. Qty ADD TO YOUR WISHLIST. 2 ohms. However, with 20 watts operating outside, I was able to make contacts. As I understand it, most mobile antennas dont have ground plane radials because the metal roof of the vehicle is the counterpoise. If you have two hamsticks on the same band to make a single band dipole you can add another pair of a different band to the same feedpoint and that will make a multiband dipole. The BB7 is Diamonds answer to the Comet CHA-250B, which is an end fed pipe with about a 61 balun at the end and no ground radials or counterpoise. If possible run the counterpoise above ground away from or perpendicular to the antenna wire and do not ground the counterpoise at the unun. The Super Antenna MP-1, Buddistick, PAC-12, Hamsticks, Hustler, . Diameter Terminals, 4 Tent Stakes, Each Part Number CHA-COUNTER-KIT. Your Hamstick is hand tuned to resonate on 7. itself requires a good ground or counterpoise (usually the. Jan 28, 2016. counterpoises as an all-band antenna fed by a "tuner". I read that the counterpoise should be shorter, and should also feature impedance. The bandwidth of the 40m HAMStick is limited due to its short length on 40m, so I tuned it to work best in the 40m DX window and the lower part of the US phone sub-band on 40m. The counterpoise wire is an important part of tuning the antenna. Using this, I obtained results no better than when using other, allegedly less efficient antennas, with the added problem that the best SWR achieved. Check out TheSmokinApe Merch Shop httpsshop. I also included a switch between the coils and the BNC connector to select either just the top coil (17 meters) or both coils (20 meters) using solder, hot glue, and tape. If the antenna is ground-mounted or has a base less than 18. The best counterpoise is 14-wavelength at the lowest frequency you intend to use. Again do not allow the whip to enter the close wound loading coil area of the Hamstick antenna in order to not shear the wire that passes through the fiberglass rod. This isn't even an approximation of a good ground. This winning combination stands head and shoulders above shorter backpack antennas. An Inverted-L antenna is basically a wire antenna, typically to wavelength long on the band it is designed for. The measurements below are for building a simple Dipole Antenna. A good ground (counterpoise) is also needed. Two 75-meter whips were almost three S-units (about 18 dB) below a half-wave 75-meter dipole (no wonder, since a 75-meter half wave dipole is 130 feet compared to the 16 feet of the two whips). Log in to Reply. For example, I was calling CQ this morning on CW in my car, 20 watts into a hamstick on 30 meters, and I was heard by skimmers at 1066, 1144, 1254, 1310, and 2618 kilometers. This is what you have been waiting for Ahigh power mobile hamstick that handles 600 Watts MFJ-1675T, the longest of the 600W hamsticks has a 53 inch long base and the whip with the ferrule is 40 inches, giving you almost 8feet of a real mobile antenna. On 80 through 40m its a dreadful performer and a tuned 7ft Hamstick on a small car will put out a bigger signal. 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. Longer is not necessary, but I think ok). I use an easy wire jig for sizing and tuning one set of 15 radials to work for 20, 40 (and 80. The counterpoise WRCM describes--a good suggestion--was the 5-band "thing" I used for years while in a house where no ground was possible. Type Helical wound HF mobile antenna; Frequency 29MHz; Length 245cm; VSWR 1. On 20 meters, we were surprised to see only about one S-unit (6-dB) difference from a G5RV dipole antenna. To compare the two antennas, a ham. The total length is about 7 feet and the base is a 38 inch 24 TPI (turns per inch) bolt with male threads. Each leg telescopes out two places and the mast also extends if needed. Apr 21, 2017 All mobile antennas have very low efficiency on the lower bands (40, 80, 160m). I got a 59 from Boston the day I. Antenna&39; but it did not come with a &39;random length counterpoise. Here is the configuration (thanks to PD7MAA). I carried my 20m Hamstick & counterpoise but I also packed a bunch of wire, cable, fittings and ferrites for making dipoles. The stainless steel whip is adjustable for lowest SWR. Counterpoise The conductors > in length > than wavelength of the frequency at the end of a single wire (or rod) antenna. On higher floors youll need a counterpoise. the counterpoise to an inverted L antenna which was operated against those. Say, you want to compare a Hamstick and a tall Tarheel (or similar) mobile antennas on the 40m band. Part 2 A 40 Meter EFHW with a Radiator wire and various length Coax-as-Counterpoise wires is analyzed We will see that the common-mode current is almost always LARGER on the coax shield some distance away from the feedpoint, which is why the counterpoise radiates and is called the other half of the antenna. If you set up your 1899T antenna, using the above supplied measurements, you should get a low SWR on each band. I am interested in adding a counterpoise to improve its. Onderwerp FT817 Length of Counterpoise wire for hamsticks Hi All, I have acquired 2 hamsticks (20M and 40M) to use with my 817ND. Make it anything from 0 to x units long and start experimenting. 27 . Optional items. counterpoises as an all-band antenna fed by a "tuner". Alternatively, I sometimes opt for the convenience of two 40-meter hamsticks, specifically MFJ-1640T HF Stick. I got a 20m hamstick to work nicely on 17m by using my 19-inch 2m quarter-wave antenna (with 38-24 threads) on. Use these inexpensive, lightweight, isolated mini-dipoles when space is limited for temporary or permanent installations. 2 ohms. I have had this antenna now about 6 days. While these lengths have been shown to work well on many bands, which is helpful if you're in a hurry to get on the air, read up on the topic and experiment. Pulled out the comet antenna analyzer, tuned up the antenna for 7. 71 before using an antenna tuner. If you will be running QRP only, you can use wire as small as 22 gauge. The MFJ-1899T seemed like the ideal antenna for sitting outside on a nice day making a few contacts or maybe even usable for field day. I built mine following an article by G3BDQ in Practical Wireless. With regards to a counterpoise orientation shaping the propagation direction, he stated that it is generally accepted that using only the coax as a counterpoise tends to have the antenna pattern slightly favor the direction in which. The performance isn&39;t bad on the antenna, and the build quality is fine. I have a "claw-type" mount that is attached to the patio railing. 02 meters). Description Operate 80, 40, 30, 20, 17, 15, 12, 10 HF mobile and 6 and 2 Meters VHF with just one amazing antenna. 2 ohms but at 28 MHz it has an AC (RF) resistance of 2. 5 m (98 in) counterpoise for 10 m band. Four 5 12 ft. Thats a lot of wire at, say, 3. Subject FT817 Maldol AH-C7 loading base with AH-R Whip. Just connecting a wire to your radio will not be effective. Alternatively, I sometimes opt for the convenience of two 40-meter hamsticks, specifically MFJ-1640T HF Stick. Jun 29, 2022 Quick impedance calculations indicate that a 58 ft "random wire" antenna could work for this. This allowed me to screw in the desired hamstick for the band I. (Yes, it&x27;s shorter than a quarter wave. de WK4DS. You can also use ham stick, wonder lead and BuddipoleTM antennas as a tuned counterpoise. I got a 59 from Boston the day I put it up. The length of Great Britains coastline is 7,700 miles. A counterpoise is installed at ground level, or as high as the switch can easily be reached, and a dipole is mounted. Consists of a 42&39; radiator and a 42&39; counterpoise. provide an RF current "return," a counterpoise wire attaches to the antenna ground. vertical antennas hamradio 0000 Intro 108 Cutting the Fence 250 Design for 3-element Array 328. It will work 'meh' on ssb. It works pretty well, much different though from the wire I had up, much more noisey. Many amateurs harbor the notion that DC grounding an antenna mount will magically act as, or replace, a ground Plane. Im often asked this question and after 5 years of development, I think I finally have the answer thanks to both real-worl experience and the work that Rudy Severns, N6LF did in a controlled scientifically based experiment. You want to make a SSB contact on 7. The Z of a whip of the length of a ham stick should be only a few ohms,. Two 75-meter whips were almost three S-units (about 18 dB) below a half-wave 75-meter dipole (no wonder, since a 75-meter half wave dipole is 130 feet compared to the 16. Inside the Chameleon 91 Unun. I use two 33ft counterpoise wires that I hook up to the mag mount. But I am unsure which counterpoise length to select. Counterpoise Definition "Counterpoise" has been used by radio amateurs since the very beginning of our hobby. SWR was too high, around 31. I have a "claw-type" mount that is attached to the patio railing. T he vertical is a popular antenna among hams who lack the space for a beam or long wire antennas. A ground plane or counterpoise system to ensure efficient operation of the . antennas are favored for their compact size, portability, and ease of use. the second section titled Recommended wire lengths and Configuration Notes for Unun models 4130, 4132, 4134, 4932, 4935, 9130, 9132 & 9135. 5 with about 30 feet of wire as a counterpoise, but I lost that configuration. The eight-foot whip disassembles to two. Fishing bag 150mm; Counterpoise (quarter wave length); Antenna tuner . 5 m (98 in) counterpoise for 10 m band. Also I&39;ve yet to see one of those hamstick dipoles work under 40 meters. The antenna wires are connected to the Center "T" using the supplied ring terminals. Most of the "no radial" antennas use the coax as a radial. 5 inch for VHF, 6. The coax shield acts like a 3rd counterpoise up to the point where its connected to the common mode choke. Please advise the lengths of the counterpoise wires for each of the hamsticks. antenna is mounted about 116 of a wave length above the earth and four wave radials are attached there, your radial system will perform about as well as 120 buried radials. Show More. 28 . I use them with a three magnet mag mount on the roof of my car with the 11 common mode choke from above and two 33ft radials (the same radials that I also use for the vertical above and the Wolf River Coil below). It&39;s about 50 bucks and yea you can use you truck as the counterpoise (aim truck at direction you want to work). Im often asked this question and after 5 years of development, I think I finally have the answer thanks to both real-worl experience and the work that Rudy Severns, N6LF did in a controlled scientifically based experiment. ) BAND LENGTH WIRE SEGMENTS 6 m. 6 feet 12 meters 9. If this is the case, then adding pieces to the antenna isn&39;t going to make it more effective it&39;s going to mess it up. Both brands cost about 24 per whip. - When operating on grass, pavement, or any. I own a 40m hamstick dipole kit, but added a custom antenna to one end and made it a vertical, using the other hamstick as a counterpoise. The feedline acts as a single random length radial. I have a "claw-type" mount that is attached to the patio railing. I&39;ve tried them for base and portable and performance was not so great. A 35 ft counterpoise would seem to fit the bill. stick dipole at 25 verses a full size dipole at 35. I just got a 20m MFJ hamstick-style antenna to experiment with for camping & portable operation with my FT-857D. 26 . If possible run the counterpoise above ground away from or perpendicular to the antenna wire and do not ground the counterpoise at the unun. I would probably have better luck putting a hamstick on a tripod and throwing out some counterpoise. It works pretty well, much different though from the wire I had up, much more noisey. Two 75-meter whips were almost three S-units (about 18 dB) below a half-wave 75-meter dipole (no wonder, since a 75-meter half wave dipole is 130 feet compared to the 16. Simply screws into any 38 x 24 female mount for quick. I don&39;t have a counterpoise connected to the unun, and my coax cable feeder length from shack to antenna is 20 meters long. The basic 17 meter modification to the original 4BTV requires no holes or any other modification that requires damaging the original mechanical structure of the antenna. It&39;s a multi-band 80-6 meter wire dipole. AJ1G 2003-03-19; Hamstick Option on 75 For More Bandwidth; Read this thread with great interest. Feb 15, 2020 I&39;m installing a vertical antenna in back yard. The cathedral ceiling peaks at about 15 feet. My advice is to not use them, at least below 20 meters, unless you have a good reason and there aren&39;t any other good options. In other words, the same counterpoise wire is equal to 0. Field strength of my 160-meter 14 verticals, at my present location,. There are also magnetic loop antennas. When used like that, the 16 foot wire is called a counterpoise. Even when they&39;re perfectly "resonant", they will be way, way below the 37 ohms that a full length 14 wave will be. On 3. 5 feet 15 meters 11. The antenna required some adjustment, particularly in the 20 meter segment, which was cut a bit short. The mount point for these is on a 4x4 inch metal. Each whip is designed to cover one amateur band and can be adjusted from the phone to the CW sub-bands by changing the stinger length. With GaussView, you can build or import the molecular structures that interest you, set up, launch, monitor and control Gaussian calculations, and view the predicted results graphically, all without ever leaving the application. supplyload circuits. length (since many factors influence this result), but rather to show what happens as the counterpoise length approaches zero. Each American made antenna covers a single HF band with a power rating of 250 watts P. Wire lengths for the 41 ratio in models 4932 and 4935. DX Engineering promptly shipped my piece of RG11 along with some solder type. It&39;s a multi-band 80-6 meter wire dipole. If this is the case, then adding pieces to the antenna isn&39;t going to make it more effective it&39;s going to mess it up. So, the counterpoise wire was cut to a length of 16. of the available metal as possible. The performance isn&39;t bad on the antenna, and the build quality is fine. 1 wl (wavelength) radials of lowest. I got a 59 from Boston the day I put it up. mrshine101 4 yr. I am interested in adding a counterpoise to improve its. I found the need for a counterpoise is mandatory and typically the length is going to be. I put a 20m hamstick on a backpack and trailed a counterpoise . On 3. Apr 21, 2017 All mobile antennas have very low efficiency on the lower bands (40, 80, 160m). 14 wave length, and you can set-up a pair for each band you have without needing to disconnect any of them between switching HamSticks, . of the system" I am referring to the counterpoise, usually a set of radials or whatever the hamstick is mounted to. I got a 59 from Boston the day I. - When operating on grass, pavement, or any. The Wire Size can range from 16 AWG to 12 AWG. Lightning Protection. I have a "claw-type" mount that is attached to the patio railing. Wire lengths for the 41 ratio in models 4932 and 4935. I have the small stand that has the ground stud attached and use copper wire for my counterpoise. 5 m (98 in) counterpoise for 10 m band. These MFJ monobanders are available for 6 Meters and each HF band. Recommended for the MFJ-2640T, HIGH POWER HAM STICK, 40M, 600W, 38-24. Say, you want to compare a Hamstick and a tall Tarheel (or similar) mobile antennas on the 40m band. I just got a 20m MFJ hamstick-style antenna to experiment with for camping & portable operation with my FT-857D. I&39;d suggest tuning each hamstick separately (just use a 17&39; piece of wire for counterpoise). Radials bent to fit small lots will work, but will. 10 dB -). 5 inch for VHF, 6. 200 MHz. used propane tanks for sale, findlay kia st george
mrshine101 4 yr. . Hamstick counterpoise length
Radials No discussion of vertical antennas including hamsticks would be complete without talking about a counterpoise or radial system. It has a better chance of working if they are the same though. the counterpoise to an inverted L antenna which was operated against those. on a side. 14-16 gauge stranded wire (minimum 50 feet or wavelength at the lowest frequency you will use), plus extra for a counterpoise. I just got a 20m MFJ hamstick-style antenna to experiment with for camping & portable operation with my FT-857D. by Dan Maloney. Longer is not necessary, but I think ok). 27 . From there,. You can use a capacitor or some inductance at the base to tune out the reactance and get to 50 ohms to make the transmitter happy. We make current as uniform as possible over the length of the antenna by using as. there are no free lunches in RF land. Im currently using a hamstick with mag mount for activating and either a 2040 fan dipole or the same hamstick with a ground spike and radials. 624 m) length of insulated antenna wire. ago Ok. I set up my 20m Hamstick on a tripod with 4 x 5m radials today and used a. The black dots represent exact harmonics of the 3. Antenna&39; but it did not come with a &39;random length counterpoise. The MFJ-1899T seemed like the ideal antenna for sitting outside on a nice day making a few contacts or maybe even usable for field day. Note that the point of this article is not to provide definitive values of impdances vs. 6 feet. Despite this, some them work pretty well. Hey guys, so until I can build or borrow a balun a friend loaned me a 20, 40 and 80M hamsticks. I suggested that we try connecting a wire counterpoise to it, . Near Vertical Incident Sky wave (NVIS) is accomplished using horizontal dipole configuration for communications at distances from 200 miles to 800 miles. ) BAND LENGTH WIRE SEGMENTS 6 m. 09MHz and the SWR and impedance were off the scale. stinger length. Well-done, easily understood tutorial. 26 . A 35 ft counterpoise would seem to fit the bill. Pedestrian dragging counterpoise length With broadly tunable whips (such as MP-1, mobile whips, etc) I've found empirically that a pedestrian dragging counterpoise wire can be about 10 to 25 shorter than the standard quarterwave formula predicts, and the whip will usually tune to a fairly good 50ohm match. Aug 31, 2017 The hamstick connects to a T connector. To compare the two antennas, a ham. On 20 meters, we were surprised to see only about one S-unit (6-dB) difference from a G5RV dipole antenna. The MP-1 is marketed as a portable antenna and comes with a "ground plane" consisting of a 10 foot length of ribbon cable split into four lengths. > better results with a hamstick on my car. Jul 30, 2018 - 4 m (13 ft) counterpoise for 20 m band - 2. Radial Systems for Elevated and Ground Mounted Antennas. Mar 9, 2023 Overview Shark Antennas 4-Pack 10-80M Hamsticks 10M, 20M, 40M, and 80M. Jan 28, 2016. The first thing to know is that there are three functions served by grounding in ham shacks 1. Verticals are commonly installed at ground level, although you can also place a vertical on the. Apr 13, 2021. Fast Setup and takedown. 5 for UHF and about 19. , 3 in. The SWR jumped up to 8. all i have heard was some cw on 40 meters and one qso on 20 meters. I am interested in adding a counterpoise to improve its. Each leg telescopes out two places and the mast also extends if needed. Using the supplied 91 Unun and a Z11 Pro auto atu at the base of the antenna. Don't kid yourself, this isn't as easy as it sounds. Thats roughly 4-meters. Pedestrian dragging counterpoise length With broadly tunable whips (such as MP-1, mobile whips, etc) I've found empirically that a pedestrian dragging counterpoise wire can be about 10 to 25 shorter than the standard quarterwave formula predicts, and the whip will usually tune to a fairly good 50ohm match. Radials No discussion of vertical antennas including hamsticks would be complete without talking about a counterpoise or radial system. The larger the wire, the wider the bandwidth. Length 6 meters. Last, I have reviewed a few websites on ground plane antennas and noticed they all cut the counterpoise the same length as the vertical. The first thing to know is that there are three functions served by grounding in ham shacks 1. Jan 19, 2015 The design uses 12" PVC outside the balcony for weight savings, and 34" PVC for strength and counterbalancing, inside the balcony. With a single 14 wave counterpoise wire I have easily been able to achieve less than 1. If you set up your 1899T antenna, using the above supplied measurements, you should get a low SWR on each band. Has anyone tried the Maldol monoband whip antennas, specifically the 40 meter AH-C7 with AH-R whip I bought one but am unsure of the total length to extend the whip, given that it uses a loading coil with an unknown number of winds. The other end has a shorted 14 wave length (corrected for cable VF) of coax as a counterpoise. Hamstick whips have two small set screws that must be loosened to remove the stinger portion. length (since many factors influence this result), but rather to show what happens as the counterpoise length approaches zero. A counterpoise is simply a long, insulated wire that attaches to the ground connection on your antenna tuner. If not, you can cut a 16 foot length of insulated wire, attach it to the shield side of your mount, and either let it drape over your balcony, or run it along the floor. Stray RF Suppression (or simply RF Grounding) 3. A good ground radial or counterpoise system is necessary for your vertical antenna to operate at maximum efficiency. I got a 59 from Boston the day I put it up. Since it was on a pole and needed a counterpoise I attached 16 feet of stranded wire to the ground side and immediately the resonance changed to just under 14Mhz and it was possible to tune the individual stick. A cheap Hamstick will usually put out a better signal but people still keep buying the ATAS. Hamstick whips have two small set screws that must be loosened to remove the stinger portion. Yes on the camper I am using a Watson triple mount from Nevada. This is the feed impedance and SWR of an end fed 80 meter half wave with an ideal 491 transformer and good stable counterpoise or ground. 44m) Portfolio Bag Size 9" tall by 14" wide. This is the feed impedance and SWR of an end fed 80 meter half wave with an ideal 491 transformer and good stable counterpoise or ground. I use an easy wire jig for sizing and tuning one set of 15 radials to work for 20, 40 (and 80. If you&39;re ambitious, you can use threaded fittings here and there so you can take it apart and keep your better half happy when you&39;re not using it. It covers the 3. 95 times that of a standard half-wave dipole, it offers good impedance matching to various feedlines. 5 lbs (1. 038 MHz and then switched it to 21. , 3 in. 22 . and were used together as. I recently purchased a Buddistick Pro Deluxe antenna system and have found tuning on 40 m mysterious. Most of the "no radial" antennas use the coax as a radial. Onderwerp FT817 Length of Counterpoise wire for hamsticks Hi All, I have acquired 2 hamsticks (20M and 40M) to use with my 817ND. Then tune your portable antenna to the lowest SWR you can achieve (depending on the antenna this is done by using different taps on the loading coil, sliding a sleeve, or adjusting the length of the antenna whip). Using a tape measure and wire cutters, cut pieces of your wire. I used this online calculator for exact theoretical lengthshttpsm0ukd. Thanks Frank N3NGU. . craigslist green valley az cars by owner