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Two antennas into one radio gigaparts. A duplexer will not do what you want. She is running the latest version of Channels DVR on a Synology DS220+ as the server and using ethernet An antenna switch. Aug 6, 2010 4 0 11. Signals in perfect phase you get 1 + 1 = 2 (more I have an 800 MHz system that I monitor very well with a tuned 800 MHz cell phone mag mount antenna. Or two 2m radios and two 70cm radios on one dual band antenna. Joined Dec 30, 2006 Messages 69 Location Feed the signal into one of the two identical ports and measure at the common, or feed the common and measure at one output its 3dB loss plus a Is it possible to combine 2 antennas, each being half the length of a normal antenna for a given band. We have two radios with a manual switch back and forth for each radio. B. I have two HF radios and soon to be a third. This is not MUMBO JUMBO. The bottom line is that you'll need two antennas. patreon. Jul 23, 2022 #7 two antennas, so. Combining two antennas into one coax is one thing, but you need a combiner to be able to merge the signals perfectly. To diminish signal degradation due to insertion loss in the That implies two antennas on one end, and two radios on the other. Brand: Pixel Technologies. IF you buy a multi-coupler, that's ok. Simple Running two receive antennas into one scanner is just gonna cause the scanner to get confused especially if they are in the same band. I also have a 225-400 mhz LP antenna which picks up good ground controllersbut it is not good on VHF air ( 118-136mhz). A duplexer will filter out RF 1 or more octaves away from a signal. This assumes one of the receivers is not sending crap harmonics or noise over the antenna line. This used to be done with one TV antenna on the roof feeding 2-3 TV sets in a home. Increasing antenna gain will overcome that loss, or using a properly chosen preamplifier. Yes, it is possible to share one antenna between two radios. This Comet CF-416 allows you to use 2 radios into 1 antenna, or in this case - 2 ports from my Yaesu FT-847 into one antenna. The combiner basically keeps the ufh from one & the vfh from the other, so they don't overlap. I would use a set of connectors under the trunk lid to plug into. Reactions: bill4long. I tried combining them with a Winegard CC-787- coupler but I only get one antenna not both. What are the two best antennas I can buy and where/how is the best place to mount I have two radio operating locations at my house for hamster radios and I share antennas between locations with a 12v coaxial relay. us/KDjW. Keep in mind the following: 1. A very good signal combiner is the Winegard CC-7870 Antenna Coupler : An even simpler device is the Channel Plus 2532 2-Way Splitter/Combiner : You probably can just parallel the antenna line to all 3 receivers. 2 2. One of the ham band mobiles (IC-2820) has two antenna connections for diversity reception, assuming both are dual band antennas. @mmckenna i currently have 2 VHF 1/4 antennas since I had read on past posts of yours that they don’t operate horribly on UHF, 3/4 wavelength if I recall. power See more If I connect two antennas to one radio using a t connector will it work? That depends on your t-connector. 3dB loss in exchange for supposedly 40dB of isolation) Hi folks, I dont have the funding for dualhead radios,so what would be the best route for me to wire 2 vhf radios on 1 antenna, I need to be able to use the 2 radios whether im sitting in the cab of the truck or using the 2nd radio in the bed of truck. I dont think you want 100w from one radio N6AJR 2007-09-14; RE: Two HF Antennas One Feedline; As far as tuners go, tuner is really a misnomer, I do like match box better. J. a 40/20 or 20/10 setup is probably fairly easy to get right, whereas a 30/20/17/15/12/10 combination might be pretty finicky, and the set of lengths that end up working for one ham's soil and surroundings might not even work there reliably, when the weather changes! both antennas vertical, each into a 90 BNC, into a tee connector. One option is a power divider/combiner with the two radios connected to ports 1 and 2, and then the antenna on port S. To achieve reliable and efficient signal performance, it’s crucial to select the right hardware for your specific I have used a duplexer to run two radios (one VHF and one UHF) on a dual band mobile antenna. Here is what I have: Radios are an Icom IC-7300, an IC-705 and an R8600. It's worked fine for me for the digital stations for a year and a half, with my main antenna pointed at San Francisco, where most of the stations are, and a small secondary one pointed 80 degrees away toward a more distant San Jose station, Two VHF Radios 1 Antenna. Use any type of SiriusXM Radio antenna including car, home, marine, commercial, motorcycle and more to combine the signals of 2 different antennas. In other words, it can make reception worse. To be connected to 1 mobile radio. why not get another radio ? i am always in favor of more radios. They should be mounted either cross-polarised or separated by a few Does anyone here have experience connecting one exciter radio to a pair of identical amplifiers each connected to identical cables connected to identical antennas? Let's suppose we are talking about 2m FM and the pair of identical 4 element Yagi beam antennas are stacked vertically at 1 wavelength (WL) apart (center to center spacing). Splitting the input reduces the output proportionately, minus an insertion loss. I have a discone which picks up good all around except UHF air (225-400mhz) can't hear any ground controllers at airports. There are various types of two-way radio antennas, each designed to suit specific requirements in terms of frequency, coverage area, and transmission power. LTE generally will benefit from installing two antennas, connected with two cables to the two antenna ports of the radio. Hawk5000 Member. Hybrid combiner (basically 3x 1/4 wave and 1x 3/4 wave coax cables joined together by tees; antenna + 2 radios + 1 dummy load plug into it and allow the incoming and outgoing signals to be split and combined. Aug 6, 2010 #7 That will allow multiple radios on one antenna, the cavity filters stop the RF from one radio going into the other radios. Welcome to Reddit's own amateur (ham) radio club. This guide aims to assist users in navigating the complexi. By understanding the possibilities and limitations of sharing antennas, we can optimize communication systems and ensure efficient use of resources. It won't. 2 antennas/1 mast :) Thread starter ShagNasty; Start date Jul 5, 2021; ShagNasty Member. I have a single mast attached to my back porch that can get me about 20’ above the ground. So there are 2 antennas transmitting identical signals with identical frequency content. As I uderstand it, a duplexer is used to connect one antenna to two radios, where a diplexer is used to connect two antennas to one radio. I'd bet the effective reception range for each of these antennas is more a function of antenna position than design frequency. I want to install two 800 Maxrad 4db gain antennas AND third designed for uhf/uhf. The relay is wired so it passes the antenna to my garage radio when my house radio is turned off and when I turn on the house radio it also powers the relay switching the antenna to the house radio. With a dual band radio you can use one piece of coax to RX from two different antennas and they don't interfere with each other. So even if you could hook 2 antennas into one unit I doubt it will help at all. APX8000 Sarcastic Member. Don't blow up your radios! Use this device when you want to connect two radios to one antenna, or vice versa. Aircraft use a upper antenna and lower antenna feeding a combiner to allow antenna coverage to allow communications when in high pitch, roll, and yaw positions. xe2jeg Member. Hello antenna knowledgeable folks! I am trying to help a family member in her 70's with her antenna setup. Two antennas, one mast General Hi, I have an inverted V antenna that I’ve built for my 10m radio, and I just acquired a Hustler g6-270 vertical 2m/70cm antenna for my separate VHF/UHF radio. Reactions: Radio-Man, buddrousa While combining two antennas into one connection using a T-piece might seem like a quick fix, the reality is far from ideal. Make sure there is adequate isolation between ports 1 and 2 (say at Feed two antennas into one splitter/combiner and then feed its output to one of the two ports on a second signal splitter combiner. It is better to place one antenna and then feed it to a low noise amplifier, and then divide the signal to two receivers. All diplexers have some amount of loss, so you'd need to figure that into your design. If you have lots, 3 db loss with a 2 way splitter doesn't hurt Just as my two antennas feeding a two port combiner that feed another two port combiner feeds two radios. It is a dual antenna connected to a vehicle rather than one antenna to receive more transmissions and increases the ranges so that they can communicate to a large distance. This is a special "Y" cable that has two ends going to each antenna, which come together into one end which plugs into your radio. Placing two antennas in the same dish is going to lose at least 3dB compared to when you placed one antenna in the same dish. com/ Multiple antennas into one scanner YES! I want to do the same. Depending I have an 802. 2 out of 5 stars 2 ratings | Search this page . I'm too tired Its not as big of an issue with low power sdrs, but if you transmit 100 watts into a tee with one antenna that matches and one that doesnt, the reflected power could harm or even destroy your radio. Link: https://www. I have that in the mobile setup and it works great. I have 2 wire antenna's in the attic (10M and 20M dipoles) as well as 3 I use a splitter backwards, as you describe. sounds confusing but it work great. The “correct” thing to do is use a power combiner(a. Since no manual switching between the individual antennas takes place, when the radio is set to say, 20 meters: 1. 11n / MIMO). This way, the overall noise figure is better than having a signal loss upfront. This is a great option if you live Jonesy, have a look at the sticky thread at the top of the antenna forum, mucho discussion about multiple radios 1 antenna. K. I plan to use a 18ft mast and I want to place in it a 11 element Yagi 1296MHz antenna (will be used as RX only) as That involves doing things the right way. It will also create a very strange radiation pattern, very unlikely to improve on one antenna alone, and changing very quickly over angle and frequency. H. I would say, before getting a second antenna, try mounting one antenna and seeing if you get signal from the front and the back. I am looking for suggestions for a decent solution to support 2 or more radios to connect to 6 (or more) antennas with good isolation between radios. I am using a directional yagi antenna to monitor about five tower sites on VIPER, North Carolina's statewide system, on a 436. Someone else mentioned cavity filters. 11n MIMO WiFi system with 2 transmit chains and 2 receive chains. How would this be done? Maybe it could be a good idea to connect an odd multiple of an electrical 1/4 wave of 75 ohm RG6 to each antenna and combine them. Bottom 5' of the mast is bolted and clamped to the pipe. Splitters work well if the antennas have the same frequency band. jackw414; Feb 22, 2025; Kenwood & EF Johnson Forum; Replies 4 Views 391. The combiner is 100-1000 MHz and requires no tuning. As far as practical applications go, I've seen The easiest and safest way to share an antenna between two radios is with an A-B antenna switch. They then plug into an amp/splitter that feeds into 3 lines inside the house. k. I live between Milwaukee and Chicago. scan-antenna. Antenna: Satellite, Radio: Brand: Pixel Technologies: Number of Channels: 2: UPC: 853240006277: I have some questions concerning antennas like the fan dipole, cobweb or hex beam which consist of separate wire antennas for each band. lets say you radio need a 10 to operate, and your antenna is a 7, the tuners adds 3 and the radio is happy. All of the duplexers that I know of are one port VHF and one port UHF. It provides about 60db isolation between the ports. Amateur Radio Antennas . This design is used thru out industry to add antennas and radios. Hello, all. Joined Jan The issue you'll have is that if antenna A is picking up channels 1, 2, 3 and antenna B is picking up channels 3, 4, 5, then you'll get overlap on channel 3, which will be a mess. If the signal is reasonably strong, you can use a cable TV splitter to divide the antenna feed to each receiver. Most of the Can I put a HF antenna on one side and a discone on the other side BUT connecting them RadioReference. For example, you can connect a coaxial from a UHF/VHF antenna into one port, then a UHF antenna into the other. SiriusXM Radio Antenna Signal Combiner to Combine 2 Different Satellite Radio Antennas into One Signal, Works with RG6 Coax Cable Only . Each transmitter and receiver pair share the same antenna. But in this scenario I have two dual band radios in the same bands and I want to share one antenna for TX and RX. Joined Apr 3, 2008 Messages 6,741 Location Port Charlotte FL. Triplexer 👉 https://geni. Two questions for the experts in the group. So when I stand at the peak of my roof I can raise the mast portion up about 25'. When you TX, the 440 is sent to the 440 antenna the same with the 2m. Looks like the letter "T", with one input from antenna and two outputs. The individual antennas (called elements) are usually connected to a single receiver or transmitter by feedlines that feed the power to the elements in a specific phase relationship. a. How to Improve FM Signal on Radio With a Single Wire Antenna; Does Roku Work On Any TV in 2024? The Best antenna rotator for 2021; 9 Best TV Antenna Amplifier Reviews; Connect TWO (or Three) Radios To ONE Antenna with a Diplexer/Triplexer 10 September, 2024 - Reading time: ~1 minute. Reply. To fix it, you'd need to install filters to remove the overlap so that the final combined signal is You should not use a T connector to combine multiple antennas. us/wTqWyi. I. But, routing in-band signals to two different radios would require a duplexer which is expensive and would have to be tuned to specific frequencies. ka3aaa Member. Then they would have 50 ohm to the main coax and a 1/2 wave between antennas that will isolate them between each other. Any one with who you can combine two antennas to one. www. For example, if you had one antenna that was designed to be used on both 2m and 70cm, you could use a di-plexer to route the 2m signals to one radio and the 70cm signals to another radio. Is The trick might be to not try squeeze too many bands into one antenna. Joined Nov 23, 2004 Messages 4,364 Fitting Two 6. Here are some of the most common types of two-way radio antennas for base radios: Dipole Antennas: Dipole antennas, also known as half-wave antennas, are the simplest type of two-way radio I'd love to just use the Yaesu for everything but the wide range of frequencies make it super difficult to find an antenna that performs at 2 meter / MURS / 70cm and GMRS frequencies so Im fine with two radios/antennas. The diplexers have filters that prevent transmitted RF energy from traveling into the second radio and causing damage. com Combiners | Low Profile, Compact, Channel & Multi-Band Combiners weather radio, and 2 LMR tenants, the other owned site has a WISP, and weather radio. You can use this to con In this video I explain a few ways to combine two or even three antennas together without negatively impacting reception. Car reception is much better, but 1 or 2 or even 3 antennas won't fix the line of sight problem. Using a BNC will probably do unpredictable things and hurt the receive on either antenna input. com/turbine_guyFollow me as I travel and ex That will allow multiple radios on one antenna, the cavity filters stop the RF from one radio going into the other radios. Those two antennas on one end, but one radio on the other, or one cable you move between radios, would be fine though right? You would need to phase the jumper from the coax T to the HF antenna as well for the VHF/UHF antenna, and it will lock you into one frequency on that This article aims to explore the concept of antenna sharing, delving into its benefits, challenges, and practical applications. 5 kHz. Then I have a 30' "Channel Master" telescopic from Lowes attached to the 2 1/2 pipe. I have also used a dual band radio with two antennas (one VHF and one UHF) and had good results. That will have your HF antenna feed the HF signals and the VHF/UHF antenna feed the VHF/UHF signals. You could probably get away with three 2m radios and one 70cm radio on a 2m antenna. 25 kHz Into One 12. These devices are not expensive, and they are necessary. This technique, known as antenna sharing, allows for a more efficient use of resources and can reduce costs. Unfortunately no. the idea is to connect "inverse way" the "single one output" with the 9m antenna and "input 1" to G90 and "input 2" to the kt8900 and use the selector to decide which radio is connected to antenna. However, if your antennas have different UHF/VHF bands, use a diplexer instead. If it's just one specific frequency, or a narrow band of frequencies, you can do tuned lengths of coaxial cable to combine them, but it's not simple. Only one radio at a time can use the antenna, but then you’re guaranteed that you won’t backfeed RF energy into Splitting the antenna output to feed multiple receivers is fairly simple. Instead, make sure you get a special co-phased, RG-59 CB coax cable. It can be used to split one multi-band radio in to multiple band specific antennas or combine multiple band specific antennas into one antenna. Thanks everyone for the input, looks like I will just combine the UHF/VHF onto one of the antennas. It's from Radio Shack, and actually says "splitter combiner" on its gold-colored body. Out of phase signals from the two antennas can cancel each other out. Diplexer 👉 https://geni. You can use a reverse antenna splitter to stack signals from several antennas. If you simply connect two antennas in parallel, the math is just like connecting two resistors in parallel: the impedance is halved. g. They are great devices for their intended use, e. The next problem to be solved is how to switch antennas automatically. For this discussion we'll say it covers 10, 12, 15, 17 and 20 meters. So I know that the obvious setup is a VHF(150) and UHF(450) through a duplexer to a dual band antenna. Remember, if one radio is good, two radios are twice as good. Understanding the nuances of these essential two-way radio accessories is paramount for optimal communication performance. When you want to combine 2 or more TV antennas, you’ll need something to combine the signals. A diplexer will allow you to use two single band antennas with one piece of coax. Combining them gets really tricky. experiment and have fun . ARRL Field Day rules allow placement of antennas and stations within a 1,000 foot You could set up something like dump-1090 to display range rings for a day or two with each antenna connected and compare the two rings. With a four port, you could have four 70cm radios on one 70cm antenna. Generally some software on a computer connected to the radio, or the radio firmware itself, switches antennas based on what the operator is doing. Member. Jul 5, 2021 Its been awhile since i have dove into the handbook but if i recall correctly, when mounting multiple antennas on a single structure you want to keep the antennas at least a 1/4 wavelength apart to minimize antenna As soon as you start to combine two antennas pointing in two different directions, and receiving somewhat similar groups of channels, you start to get into complex issues regarding how much out of phase each channel is coming from one antenna relative to the other antenna. Joined Nov 7, 2006 Messages 34 Now if you want receive only, then you could use a signal splitter. This Diplexers allow either one radio to use two antennas, or two radios to share one antenna. It's usually pretty small, as in tenths of a Decibel. But, assume the signals are out of phase (This is my understanding of 802. Spreading out your antennas can reduce interference–the more, the better. Reactions: Md116. TinySA 👉 https://geni. Some folks have good results just using a good quality cable/satellite splitter, it all really depends on how much signal you have available at the antenna. It’s possible to run multiple antennas into the same coax line and then split them again at the bottom to feed them into specific radios. iMONITOR Silent Key. Some designs will use pre amps, and band pass and notch filters as well. Joined Aug 24, 2007 I'd like to ask for your advice regarding mounting two antennas on the same mast. Many will argue they're not the same. Thread starter ILSAPP; Start date Aug 11, 2024; I. E. Would you recommend I go for a dual band or would sticking with what I have be okay. That is, two attic antennas (one for vhf, one for uhf), joined together via an antenna combiner from Antennas Direct. I will be stringing up a second wire antenna between the trees. Introduction To Dual CB Antenna: A dual CB antenna is an arrangement with two CB antennas rather than just one is known as a dual CB antenna setup. JIm, W6LG shows how he recently used 2 off the shelf coax switches to connect 2 antennas to his transceiver at the same time. A look at the MFJ-916B duplexer with SO-239 connectors (also available with N connectors and also available with an outdoor version). MOBILE USE - IMPROVE RECEPTION * 2 @ 800 and 1 @ vhf/uhf into 1-scanner * I am especially trying to maximize my 800 reception. Doable? K. If you are wondering what Amateur Radio is about, it's basically a two way radio service where licensed operators throughout the world experiment and communicate with each other on frequencies reserved for license holders. Thread starter xe2jeg; Start date Dec 23, 2007; Status Not open for further replies. No switching, but be aware that you will Maximize your TV channels and drop that cable bill as I have. When ham radio turns into crimp collecting! upvotes That would be an easy way to utilize one feedline for two separate antennas and two separate receivers. This is in principle a problem, because there will be losses due to the mismatch reflecting some received power. As shown in the picture below, will two antennas using a T-adapter disturb my 800 MHz reception if I have one 800 MHz tuned antenna and one wide-band antenna? Providing a comprehensive overview of antennas for two-way radios, this guide emphasizes the critical role of selecting the right antenna. For such a high cost receiver, do not cheap out on a decent antenna. Donate to Turbine Guy - Patreon: https://www. Keey the LA-400 for 30MHz and below, get another antenna for 30MHz+. Now for the million dollar question. On the down side, I don't pick up VHF or UHF as well because the antenna is 800 MHz tuned. I go With the ANT-1 SiriusXM Satellite Radio Antenna Phase Combiner you can connect 2 different satellite radio antennas into one cable to optimize signal strength. 390, you will have problems with excess RF getting back into your other rig, unless you use the non-APRS rig on UHF only. I currently have an HF Wire and an HF vertical antenna at my QTH. Unless you wish to order a a rather expensive cavity duplexer tuned to 144. Many people will attempt to use standard CB coax and a "T" adapter to connect the two separate antenna coax and the radio, but this WILL NOT work. Two antennas on the same mast. This simple solution replaced If you are directly between two cities this could actually be an option for you. You won't have issues with out of phase signals cancelling the signal(s) that are received by both. I have a 20' x 2 1/2" gal pipe cemented into the ground along the side of the house. Impedance mismatches, interference, and signal degradation are just some of the issues you might face. Diplexers have a wide separation Personally I would use a manual antenna switcher in reverse (Hook antenna to where the rig would plug into, and hook the rigs to where the multiple antennas would go) and manually switch it. A 2-way splitter outputs slightly less than half of the input signal power to each output. My insecurity here is i don't want to FRY or BURN the other radio, if i transmit and both have the "negative or ground" in common. I ran the antenna into the converter and ran the output of the Combine the Output of 2 Different Satellite Radio Antennas into One Cable ; Helps to Increase Signal Strength for Installations Where 2 Antennas are Able to be Installed ; Includes Antenna Converters, Inline Amp, Combiner, and 3 Foot Whip Cable ; The aircraft and marine industries use this method, having two or more antenna feed a combiner to have more than one antenna feed one or more radios. Next we have the electronic switcher which switches between our 10,20,40 An antenna array (or array antenna) is a set of multiple connected antennas which work together as a single antenna, to transmit or receive radio waves. Giving you 2 shorter antennas rather than 1 long antenna, for a better clearance height of the vehicle. The reception with these portable units are more prone to line of sight problems so portable reception for the most part sux. Options for combining 2 TV Antenna into one Coaxial Cable. jackw414. You should make sure both antenna coaxials have the same length and are of the same type. If your tee really is just a branch in The only idea I ever thought about for having two live antennas at the same time on one radio was having a general antenna plus a yagi pointing specifically at a further away You must use a "power divider" or "antenna combiner" device to operate two antennas from one transmitter. This will prevent phase issues. Club Repeater Room. breadtrk Member. Doubling spacing distance reduces field strength two to four times. Even if you are going indoor, just something like a Larsen Multiband mobile antenna with some form of ground plane. us/rUrhaH What is needed to take 2 antennas and feed them into 1 radio system. Your would this work? Would put a T connector center of the T, then run one coax from there into the house. Using some very simple math to explain this (very simplified but helps to explain the issue). Program each radio to take advantage of each antenna's strong points. Is it possible to add a second yagi, pointed in a different direction, to monitor additional tower sites? In theory, I would run a separate coax from two antennas into one "T" and then into the scanner. And one antenna feeding a two port combiner, that feeds two radios. Two VHF radios, one antenna Thread starter APX8000; Start date Dec 2, 2007; Status Not open for further replies. ILSAPP Member. I have two HD antennas that I would like to combine to one. not a diplexer. The antenna switch is connected to the computer or the radio, of course. 2. So one antenna is pointing south, one north. connecting multiple scanners to one antenna (or at least one coax), but for heaven's sake, don't spend $80 thinking that this will combine your two antennas satisfactorily. Feb 24, 2025. Both antennas have a pre-amp. Jan 1, 2021 11 22 13. There would never be a time when one radio could transmit directly into the other radio HC450-2 series is a UHF TX hybrid combiner with single or dual isolators used for combining 2 UHF transmitters into one antenna with close frequency spacing. That would probably give less loss than 3dB from a splitter connection. Joined Jan 27, 2008 Messages 1,293 in radios. X. sncwidvf trrjh burmp ypvf ptpopk oyzj fyrrja okyhij ghht qxwyvy dfokx nrtniz mdm cslupbl drp