How To Lower Swr On Antenna

Adjust your antenna: If your SWR reading is higher on channel 40 than it is on channel 1, lower something on your antenna. Channel 20 is in the center of the CB-radio range, so it will always have a lower SWR than. In general, a low SWR means that the antenna is matched well to the radio, and that everything is working properly. The antenna lead from the tuner "longwire" terminal to the antenna should parallel and be reasonably close to the outside ground lead, if possible. You are actually tuning the antenna for best SWR. If its a fiberglass antenna, under the rubber cap at the top is how you raise or lower the antenna. this is bad and it can damage a radio. See how the SWR. So tuning your antenna and what channels to use 1, 19 and 40. A collection of information on PowerSDR and Flex Radio Flex-5000 HF tranceiver. This will be shown by the SWR increasing as you move up in frequency across the band. 7:1 sounds like a reasonably good match for a mobile antenna. You can judge the proper trim for your dipole by measuring the SWR as you adjust the antenna length. The SWR meter helps you match the impedance of the radio to the antenna. SWR is the ratio of the impedance of your coax to the impedance of the antenna. However, I have done a lot of research. For a given antenna of particular length, adding inductive or capacitive reactance changes the magnitude of the reactance. After completing the basic assembly of the collinear antenna, apply a small amount of RF with the antenna on the floor or ground. Find many great new & used options and get the best deals for Mcbazel Surecom SW-102 Digital VHF UHF 125-525Mhz Antenna Power & SWR Meter w at the best online prices at eBay!. His basic design starting point was the half size G5RV, to which he added inductors on each leg. frame/SWR-0609E. Although both current and voltage standing waves are set up, it is often the voltage standing wave ratio that is more widely discussed, as a result of the fact it is easier to detect and measure. But if you use one specific channel most of the time, and wish to tune the antenna to that frequency, you can raise or lower the tuning rings for the lowest SWR on the channel of your choice. This means that for a 50 Ohm radio, an antenna impedance of 75 Ohms will give a SWR reading of 1. I bought a Cobra 25 LTD Classic CB Radio and a Little Wil Wilson Antenna. The SWR is 72 / 50 = 1. The great thing about J-Pole antennas is their simple design and excellent performance. I am amazed - from the time I opened the box. 000+ links organized into 600+ categories and. Conclusions. SWR stands for "standing wave ratio". Parking The TurboTuner-2 is equipped with and “Park” function which will lower the antenna to its minimum height. 6 :1 in the example above, our percentage of reflected power would be 5 % with 95 % of transmitter power usable or 95 watts to the antenna assuming no other loses in your feed line or antenna. 4 Ohm when checked against chassis ground. The modeled antenna elements are made of #15 AWG bare aluminum fence wire. There is no comparison. So the actual height of the antenna will be the height above the roof. I'm a little confused about how antenna tuners function in terms of reducing antenna system SWR. The SWR meter helps you match the impedance of the radio to the antenna. By carefully adjusting the open wire feeder length it is possible to optimise the SWR readings for all the bands 80m through to 10m, but not necessarily with an SWR that is lower than 2:1 NOTE:-. Saturday, June 23, 2018 How a simple counterpoise system can lower your SWR. The EU band is lower in frequency than the UK band - the lower the frequency, the longer its wavelength (which translates to length of aerial). SWR (measured with an SWR meter) shows you how well your coax, antenna mount, ground plane and antenna match the output capability of your CB radio. I won't go into technical details, but the SWR is a measure of how well your antenna is matched to the radio. WHY IS SWR IMPORTANT? SWR readings typically have a range of about 1 through10. In fact before my purchase I had read reviews claiming such out of the box 1:1 SWR but I had a hard time believing it. To understand what is VSWR, we need to talk a little bit about signal propagation in radio frequency systems. If poor CB reception or transmission is detected, perform the SWR adjustment. Decoding CW with iPad receiving with iCom ic 7300. A bowtie antenna is a type of antenna that reputedly provides higher gain at lower radiation angles than a center-fed dipole antenna at heights considerably less than 1/2 wavelength above ground. SWR should be checked to ensure the transmit power when installation of a Business Brand, Ham or Marin radio, CB Radio or installing a new antenna. Dropping the frequency further, the SWR just starts to become marginally unacceptable for 15m band. MAKE ALL LENGTH ADJUSTMENTS IN THE HORIZONTAL LEG OF THE ANTENNA. An external meter after the amp will help you keep the amp safe and I keep one inline at all times. 5 or less is considered decent as this is the range where major portion of signal transferes to the receiver. Therefore, the frequency range within which the SWR in 52 -Ω line is less than 2:1 is often used for antenna bandwidth. Then, the indicator indicates swr of the antenna. Dropping the frequency further, the SWR just starts to become marginally unacceptable for 15m band. When checking the SWR or the "Standing Wave Ratio", you will be hooking up a simple form of a directional watt meter between your antenna and the CB radio. Signal from the antenna can strike some other object such as an exhaust stack, and reflect or (bounce back) striking the antenna and raising the SWR and degrading overall performance. With the antenna bandwidth being so narrow, tuning for maximum receiver noise yields almost optimum SWR. Mount it to the rooftop,natural wind drag will get you under overpasses,but it's a bummer in the woods or at burger king hence the spring and clip. But if you use one specific channel most of the time, and wish to tune the antenna to that frequency, you can raise or lower the tuning rings for the lowest SWR on the channel of your choice. SWR was down to 1,1 : 1 at 18. 5:1 over the entire 40- meter band, or with SWR < 2:1 over the entire 75/80-meter band. I would not even think of buying an antenna that does not state the SWR. Antenna matching Trim the length of the dipole for best SWR across the band of interest. If the antenna is not the right length, then you will get signal reflecting back into the radio. The SWR will be high on certain bands depending on the wire length you choose. means that almost twice as much power would reach the antenna for a 100 foot run using the 450-ohm ladder line then you would get with 100 feet of RG-213. The Western HF-10 multiband dipole was born out of Fred Western M0BZI's attempts at working 80m from a small garden. SWR (Standing Wave Ratio) is a measure of the antenna efficiency. Skip to primary content. I have a Firestik 3' ngp antenna connected to a Midland 75-822. QFH Antenna (The Quadrifilar Helical antenna) provides circular polarization and complete hemispherical reception, which is precisely what is needed to receive the polar orbiting weather satellites, and as a 2 meter antenna it will receive horizontal, vertical and clockwise circular polarization’s from all directions. SWR will be high. " Therefore SWR is concerned with matching the antenna to the signal being transmitted through it. Since this antenna has no exposed metal wire static charges cannot build up thus reducing noise by 6 dB over antennas constructed of exposed wired. This forms a two-wire transmission line, which helps to reduce external fields. If SWR on channel 40 comes out to be higher than that of circuit 1, your CB antenna is too long. I only make measurements at the matching unit/antenna as the SWR readings will be lower at the other end of the coax feedline due to losses. biconical antenna since it has a high VSWR at some frequencies. IC 7300 CW sound tube. You need a lot of information to understand a Vertical Antenna. We have confidence in the quality of our designs and in the performance of our components. A low flat SWR enables maximum power transfer from the transmission line. TX antenna - 4SQ-8DIR NEW 8 directions 4SQ antenna This is TX-RX antenna mainly for lower bands. His basic design starting point was the half size G5RV, to which he added inductors on each leg. The 80/40 DUAL BAND BAZOOKA antenna will handle 3 KW continuous power with no effect to performance. #6 - Test for a Proper Antenna Ground To function properly, your antenna mount needs to be grounded to your vehicle's metallic chassis. In this case, it is the amplifier. Setting your antennas SWR will reduce the restriction of radiated power. With such design, this antenna has a big radiation level of vertical polarized wave, with small radiation angle, equal 25-35°. Tighten mast set screw and again read SWR. My main shack location has a commercial J-Pole Dual band mounted on a short mast. If transmitting RF power is less than 20W then read L position, and the power is more than 20W then read H position. But greater loading (higher Q) also allows physically shorter antennas for a given frequency. Seems kinda cheap. 4 Ohm when checked against chassis ground. This helps reduce the standing wave ratio (SWR) to proper levels. all of the energy is transferred to the antenna system to be radiated. 80 Meter Inverted-L 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. No doubt you might be convinced that I've lost my marbles and that I'm going well outside the Foundations of Amateur Radio, but I have to confess, this is what radio is today, and I'm thrilled to be here learning more about how this all works. An external meter after the amp will help you keep the amp safe and I keep one inline at all times. The 29 has a built in SWR meter. The great thing about J-Pole antennas is their simple design and excellent performance. OMNIDIRECTIONAL C. The Predator antenna is one of the finest center load antennas on the market. A section of 75 ohm cable cut for 20 meters 10. I specialize in a certain type of antenna called a J-Pole. I ran a set of SWR graphs for each band to use as a reference. See here for details about Gulf Alpha and Arrow Antenna. I have edited the model on the 10mm closed-stub antenna. This makes sure the radio is safe but the SWR between the amp and antenna is important too. How to make or where to buy low power FM broadcast antennas Site analytics indicate many are searching for FM antenna information. 4 Ohm when checked against chassis ground. And found that all this did was make the SWR even lower around 1. In the MFJ949E tuner, the PCB has provision for a single transistor. A SWR meter is often used along with a short coax cable to perform a test between the antenna system and the radio. On the other end, or the bell end, secure the PVC electrical box with glue. Troubleshooting High SWR on 3-element SteppIR Yagi Antenna. This is also indicated in the ARRL Antenna Book in Figures 3 through 5 on pages 2-3 and 2-4 (it's the bulging on the right side of each of the curves). SWR stands for "standing wave ratio". *Percentage of OUTPUT Power with perfect antenna load and no other losses in the antenna system! *SWR 2. With such design, this antenna has a big radiation level of vertical polarized wave, with small radiation angle, equal 25-35°. SWR will be high. Is it true that an antenna tuner does not really 'tune' the antenna? And if an antenna is cut to resonance already, what good is a tuner? Yes, it's true-an antenna tuner doesn't really tune your antenna. In laymans terms, the coax length fools your SWR meter into thinking that your SWR is different to what it actually is !. All SWR readings must be taken with the antenna, dowel assembly inside the PVC tubing or the antenna will appear electrically shorter than necessary. A low SWR indicates little power reflection and efficient power transfer to the antenna, while higher SWR values indicate greater reflection and less efficient power transfer. Here's a simple way to lower the SWR and increase the performance of any HF/VHF/UHF vertical antenna. Below is one example of how to build an 80 metre band long wire antenna for a house with a small garden. However it is found that if the coax feeder can withstand the higher voltages and current as a result of the poor antenna match, and the feeder loss is not too high, then the system will work well. Don't get overly obsessed with SWR if your antenna is fairly well matched. This means that a better reading on the EU band means the aerial is too long. If my antenna is 65 feet away from my radio, I need a 14. To “park” your antenna, press the TUNER/CALL button as if. 5 is desirable. It's very easy to do. Require test equipment and technical know-how to tune to designed frequency, and to reduce SWR to 1. A dummy load has a perfect 1:1 SWR but is a terrible antenna. SWR stands for "standing wave ratio". A value less than 1. You can make a very short antenna almost like a coil, that radiates badly but does not reflect power either, and you will get great SWR, but terrible performance. If the reflection coefficient is given by , then the VSWR is defined by the following formula:. A low flat SWR enables maximum power transfer from the transmission line. 9 or lower, please see this article on interpreting SWR between 1. In general, a low SWR means that the antenna is matched well to the radio, and that everything is working properly. If the SWR is higher on ch 40 slide the whip down, If the SWR is higher on ch 1 raise the whip. My last antenna was a random wire up 60′ which I loved until it came down, and my yard is such that I really can't put up a new one until February (when the leaves are gone). At the radio, SWR would measure significantly lower because the lossy feedline absorbs reflected power. The Horizontal Loop, also known as the Loop Skywire Antenna, is an old but very effective design. 50 MHz SWR is 2:1 (I did not attempt to adjust for a lower SWR). I ran a set of SWR graphs for each band to use as a reference. If the standing wave ratio is equal to 1, it means that the radio waves transmitted by the transmitter to the antenna do not have any reflection and are all emitted, which is the best case. Mount relay on flat piece of plexiglass or equivalent and waterproof. An antenna that operates well across only a very narrow range of frequencies is going to generate a relatively high Q value. Hi folks, Newbie HF Dave here again with an end fed antenna design question. #6 - Test for a Proper Antenna Ground To function properly, your antenna mount needs to be grounded to your vehicle's metallic chassis. Although both current and voltage standing waves are set up, it is often the voltage standing wave ratio that is more widely discussed, as a result of the fact it is easier to detect and measure. SWR can only be accurately determined at the antenna 9. On Sunday morning November 1, 2015, I noticed higher-than-normal VSWR while using my 3-element SteppIR on 15 meter JT65. However, always trim your antenna for the lowest SWR first! A SWR higher than 2, directly connected to most radios will cause the radios protective circuit to reduce power. RadioWavz Sentinel HEX BEAM Antenna Based on the original design by G3TXQ Features: Single Band Low SWR No tuning required, just plug and play Improved broad band response over original hex beam design Performs well at lower heights Handles full. Always measure the antenna VSWR at the antenna feedpoint. A perfect antenna would have an SWR reading of 1:1 - meaning that all the power transmitted up the. It is far from overcrowded, a welcome feature when compared with lower HF bands! 4. To alleviate this, keep at least the top 12 inches of the antenna above the roof line, and position the antenna as high as possible on the vehicle. By mounting the antenna on a 2M quarter wave counterpoise made from 2 speaker wires, he was able to drop his SWR below 1:3:1 for the frequency range of 50-54 MHz. The antenna needs to be tuned for best SWR. As real old timers will tell you forget resonance forget SWR you need to tune for maximum antenna current. Parking The TurboTuner-2 is equipped with and “Park” function which will lower the antenna to its minimum height. 1 swr plus it allowed the antenna to lay nearly horizontal at 55. I would not even think of buying an antenna that does not state the SWR. Then, the indicator indicates swr of the antenna. A 1:1 or 1. If the SWR is greater on the lower channels, then try gradually lengthening the antenna by moving it in. Note that the umbrella antenna has lower gain, since it has lower impedance 22. The power standing wave ratio (PSWR) is defined as the square of the VSWR, however, this deprecated terminology has no physical relation to actual powers involved in transmission. Your whip is capacitively coupled to the cab. But if you use one specific channel most of the time, and wish to tune the antenna to that frequency, you can raise or lower the tuning rings for the lowest SWR on the channel of your choice. There was a direct short in it the whole time, this is junk, I should have read the reviews. In simple terms, your radio would like to radiate all of its power, but can only do so if the other components cooperate. Grounding is key to good reception to the antenna input of my R8, I hear lots of junk, indicating that there is an RF voltage difference between the coax shield. BASE ANTENNA **BANDIT II MEETS U. If you can get the swr to around 2 to 1 or lower for each banddon't worry too much about it. If it is vice versa, then your CB antenna is shorter than required. Congratulations! If you're reading this, you've probably already installed your CB radio and antenna. In the meantime, I thought I’d go back to a vertical. The Standing Wave Ratio is equal to the ratio of radio and antenna impedances. The antenna pictured at the top of my FAQ page is the 2 meter Slim Jim antenna. A standing wave ratio of 1. swr tuning with the little wil - I am new to the CB Radio world. This will greatly change the feedpoint impedances. Classic Hexbeam - Tuning 1. Since the SWR is a function of the antenna system, changing radios will not affect the SWR. off too much of the antenna, you might need to replace the antenna's top section to receive some lower frequency. elevation angle. RadioWavz Sentinel HEX BEAM Antenna Based on the original design by G3TXQ Features: Single Band Low SWR No tuning required, just plug and play Improved broad band response over original hex beam design Performs well at lower heights Handles full. Antenna is outperforming any 6 meter vertical, I believe, on the market. Using an SWR meter, check the SWR at the top and bot-. The measurements were taken with the beam baseplate about 20ft above ground level and with half the beam overhanging a 14ft garage roof. A section of 75 ohm cable cut for 20 meters 10. Even antennas that show a perfect 1:1 SWR in mid-band will typically have some larger SWR at the band edges, often due to the reactance of the antenna changing with frequency. ZS6BKW antenna is derived by the popular G5RV dipole antenna, but offer more bands a lower SWR on most bands and radiation angle making suitable for DX About The DXZone The DXZone is the largest human created and maintained library of web sites dedicated to Amateur Radio, currently lists 20. The broad frequency response of the Skew-Planar antenna with low SWR is a big plus. 219 foot jumper from the radio to the SWR meter, and a 71. The condition where SWR is okay at the lower channels, but increases at the higher end. The same is true if the SWR is better on the UK band than on the EU band - the aerial is too short. Ultimately all results were the same, this antenna is a great buy. Why do we need to tune the Classic Hexbeam ? We saw from the Classic Hexbeam - In depth page that the antenna is relatively narrow-band; for example our 20m benchmark antenna delivers >10dB F/B performance over a bandwidth of about 200KHz - that's 1. A common measure of how well matched the antenna is to the transmission line or receiver is known as the Voltage Standing Wave Ratio (VSWR). 5m feeder has a maximum SWR of 12. If the SWR is greater on the lower channels then your antenna is too short and needs to be lengthened using the antennas height adjustment. Dual Band VHF/UHF Slim Jim Antenna. For example, for an antenna working on 14 MHz and showing an SWR 1. I won't go into technical details, but the SWR is a measure of how well your antenna is matched to the radio. But greater loading (higher Q) also allows physically shorter antennas for a given frequency. If the standing wave ratio is equal to 1, it means that the radio waves transmitted by the transmitter to the antenna do not have any reflection and are all emitted, which is the best case. Lower SWR on low channels compared to high channels means the antenna needs some shortening, higher SWR on low channels compared to high channels means you need to lengthen the antenna generally. Here is a compendium of how to make or where to buy FM transmitting antennas for low power radio. The SWR is adjuatable via the tuning rings at the base. Measuring SWR and adjusting an antenna. The optimal dimensions of this wire antenna shown on the figure below. Depending on the height of the antenna and the distance between the supports, it may be necessary to lower the antenna at two or more points, just to get to one support rope. 9 for more guidance on what it means and how to address any problems. Skip to primary content. If the SWR is lower than 1. Pacific Antenna Warranty Policy. A good SWR/Power meter will probably work fine for your purposes, but there is much more than just a good SWR when making home brew antennas, or checking used commercially made antennas. The antenna is not symmetrical and there is no advantage to trying to shorten or lengthen both diagonal legs. If the lowest SWR reading occurs on channel 1, the antenna whip is to long and must be shortened. 10mhz, other bands would also be fine with the use of an antenna tuner. The antenna feed point is the center of wire 4. Insert the antenna whip 1'' into chrome antenna adjustment mast at the top of the coil. This configuration proved stable and was easy to raise and lower to make length adjustments on the elements to tune the antenna. 5:1, you're in good shape. I know that my rig's ATU won't work above about 3:1 SWR, and this is consistent with the results shown on my analyser. 0:1* Most transceivers start to reduce power at this SWR level Using an swr reading of 1. Mobile antennas with the lowest unmatched SWR perform best 11. Today we'll try to see a very simple way what is VSWR. Arrival of the high speed stream at Earth also coincides with a small (˜1%) but rapid decrease in galactic cosmic ray flux, a moderate (˜6%) increase in lower energy. The broad frequency response of the Skew-Planar antenna with low SWR is a big plus. Notice: Undefined index: HTTP_REFERER in /var/sentora/hostdata/zadmin/public_html/e-imza_emomerkez_net/s739tp/9wc. Keep checking the SWR on channel 40 as you go up , as you raise the whip the SWR on Ch. Check SWR on both the top and bottom edge of the band. 80 Meter Inverted-L 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. DIPOLE HEIGHT The height of a horizontal dipole above. The table below gives the measured SWR and bandwidth for each band. The reason the SWR will show a lower value, and the bandwidth will show to be wider, is the added loss in the coax. all of the energy is transferred to the antenna system to be radiated. Here in Arizona, we use channel 4 all of the time for trail runs, so I have adjusted my antenna to favor the lower channels. As real old timers will tell you forget resonance forget SWR you need to tune for maximum antenna current. 061 MHz is the upper frequency limit of the sweep. It's perfect for antenna experimenters that don't want to tie a bunch of money up in the higher priced analyzers. org We’ve looked at antenna analyzers, along with other antenna measurement equipment, many times in the past, and we will continue to as new gear becomes available. From 102 Inch Whip. Here, see the article How to install CB Radio Antenna. until dipole has an SWR of 1. Figuring out if your antenna is too long, or too short Here is how to know weather or not you have to lengthen or shorten your antenna. If the SWR is greater than 2 to 1 across the entire band, a connection may separated or a short. The antenna is not quite 1/4 wavelength off the ground (probably 25 feet at the center, where I have a 1:1 balun connected to 50 ft of Belden 9913, and ever so slightly higher at the ends). SWR can only be accurately determined at the antenna 9. It's tuning can make you or break you. A remote antenna tuner installed at the base of the vertical provides the best match to the coaxial cable and will reduce SWR and power losses in the cable. Use the TZ-900 to measure the antenna impedance at the feed point at the antenna base as you add radials. So the SWR is a measurement of how much signal is going out the antenna, versus how much signal is reflected back into the transceiver. The same is true if the SWR is better on the UK band than on the EU band - the aerial is too short. HORIZONTAL LOOP ANTENNA CONSTRUCTION. Even though the VSWR is relatively high on 75 and 80 meters, lower coax loss on that band at least lets us operate there using just one multiband antenna. There are different types of CB antennas, but they follow these basic principles. What I learned back in November 2015 was that SWR at 3:1 or lower on each band meant that the driven element was working but one of the other elements was not. ZS6BKW antenna is derived by the popular G5RV dipole antenna, but offer more bands a lower SWR on most bands and radiation angle making suitable for DX About The DXZone The DXZone is the largest human created and maintained library of web sites dedicated to Amateur Radio, currently lists 20. I won't go into technical details, but the SWR is a measure of how well your antenna is matched to the radio. Was in the air in another 10 minutes. For instance a SWR too high (over 3:1) all over the band can be an indication of a bad part or junction, poor ground or poor location. The antenna could be scaled for other bands. An SWR level of a 3. antenna with negligible amount being reflected back. 3 (by extending the upper element and upper cone equally) to decrease the resonant frequen- cy and decrease 1-3 for increasing the resonant frequency. 6 feet for one leg, and only 27. Conclusion #4 : Always use an antenna tuner when operating. The Western HF-10 multiband dipole was born out of Fred Western M0BZI's attempts at working 80m from a small garden. To observe changes in SWR and line loss vary antenna feedpoint input resistance or reactance. I choose the Titan DX mainly based on the reviews on eHam. CB Radio Tuning An Antenna For Good SWR. Antenna is excellent in the VHF High Band, where I can now monitor Forest Service Fire Crews located up to 70 miles distant. Here, see the article How to install CB Radio Antenna. Repeat until lowest SWR is obtained. I'm going to enjoy this when I get back on the air. In simple terms, your radio would like to radiate all of its power, but can only do so if the other components cooperate. Hopefully you are just as thrilled. No doubt you might be convinced that I've lost my marbles and that I'm going well outside the Foundations of Amateur Radio, but I have to confess, this is what radio is today, and I'm thrilled to be here learning more about how this all works. Remember tuning can be accomplished with the toroids. 7:1 sounds like a reasonably good match for a mobile antenna. Cheap radios without protection may be damaged. Many excellent examples are highlighted in Chapter 9 of the 21st Edition of the ARRL Antenna Book[1]. *Percentage of OUTPUT Power with perfect antenna load and no other losses in the antenna system! *SWR 2. IC 7300 CW sound tube. at the lowest SWR point. The antenna subsystem is the most important part of your CB system. I'm a little confused about how antenna tuners function in terms of reducing antenna system SWR. How to make or where to buy low power FM broadcast antennas Site analytics indicate many are searching for FM antenna information. This ensures that the impedances of the feedline and the antenna match perfectly, so that all available power is being radiated. When checking the SWR or the "Standing Wave Ratio", you will be hooking up a simple form of a directional watt meter between your antenna and the CB radio. Seems kinda cheap. These are consistent with the high speed stream’s source being co-located with an active region appearing on the Eastern solar limb and rotating at the 27 d period of the Sun. If the SWR does go above 1. 0) but still recommend inserting the matching components to be able to tune the antenna furthermore if so required due to surroundings may affect the resonance. The antenna could be scaled for other bands. End fed antenna - length and SWR. The pattern and SWR plots are shown below. 6 ft) using radials and a commercial "no-radial" vertical will display the same performances, but the SWR of the second antenna at the feed point can reach 20:1 or more without losing any energy but without neither emitting the least watt !. swr tuning with the little wil - I am new to the CB Radio world. A 2:1 SWR can be handled by most radios. Occasionally, due to installations or vehicle variables, it's impossible to get SWR lower than than this. The counterpoise is off the ground only about 5 feet so the antenna is still ground mounted. When you purchase the Trunk Lip Mount version of the K40, the antenna body comes in a box and the 58" steel whip will come packaged separately due to its length. the SWR is not 1:1 because of the reactance. This may result in poor SWR, and/or poor signal reports. When you adjust the SWR, you are not changing anything on the radio. (See your antenna directions for more complete information). Is it true that an antenna tuner does not really 'tune' the antenna? And if an antenna is cut to resonance already, what good is a tuner? Yes, it's true-an antenna tuner doesn't really tune your antenna. So goes antenna systems. And found that all this did was make the SWR even lower around 1. The Horizontal Loop, also known as the Loop Skywire Antenna, is an old but very effective design. When checking the SWR or the "Standing Wave Ratio", you will be hooking up a simple form of a directional watt meter between your antenna and the CB radio. Changing the length of coaxial cable does not change the characteristics of your antenna. the FUNCTION switch to the SWR position. However it is found that if the coax feeder can withstand the higher voltages and current as a result of the poor antenna match, and the feeder loss is not too high, then the system will work well. By mounting the antenna on a 2M quarter wave counterpoise made from 2 speaker wires, he was able to drop his SWR below 1:3:1 for the frequency range of 50-54 MHz. The reason the SWR will show a lower value, and the bandwidth will show to be wider, is the added loss in the coax. Mount relay on flat piece of plexiglass or equivalent and waterproof. So I decided to use a "brute-force" approach and analyze a T-network by stepping through all of the possible component values (within a range that I'd select) while searching for those combinations that generated results that met a criteria I've selected, such as lowest loss with an SWR equal-to or better-than a target SWR (e. I also bought an swr meter so that I could properly tune the antenna for best performance. Fortunately, a given SWR behaves the same on a transmission line whether it's reactive or resistive. In fact before my purchase I had read reviews claiming such out of the box 1:1 SWR but I had a hard time believing it. What I learned back in November 2015 was that SWR at 3:1 or lower on each band meant that the driven element was working but one of the other elements was not. As a starting point, it's best to put the tuning screw either all the way in or out, so each antenna is the same length. Those are actually the only two hard requirements in the feature set: Easily interfaced to a PC; Reliably, quickly, and continuously read antenna SWR. 1 3 Calibrate for SWR (Standing. SWR (standing wave ratio), is a measurement of how efficiently your antenna system will radiate the power available from your radio. 5:1, then watch the meter on different frequencies to see the trend develop: The SWR will be greater either on the higher channels or the lower. This reading will decide whether your whip is placed optimally. 2 Switchto the CAL position. The power standing wave ratio (PSWR) is defined as the square of the VSWR, however, this deprecated terminology has no physical relation to actual powers involved in transmission.