Post-Assembly Review of the Tram 1411 Discone Broad Band Base Antenna (25-1300 MHz). I get great reception on 11 meter (CB) and VHF (marine) bands. I use three radio systems with this one antenna. These are the President McKinley AM/SSB CB (11 meter), an iCOM IC M422 VHF marine band, and a Software Defined Radio (SDR) with an in-line FM radio band reject filter, I have an antenna switch with the single port on the antenna side and the selector ports to each radio. All these radios are operating at factory settings without any amplifiers. The base of the antenna is about 20' high and the area is thick with 80' pine trees. I'm also sitting right next to a new power sub-station.
800 MHz 2.5db Gain Base BNC Scanner Antenna (back of set) A 2.5db gain antenna with BNC male connector which will significantly improve reception on 700/800 MHz, perfect for trunking systems. The antenna can be positioned at a right-angle for base scanners or vertically for portable scanners. (Reception on other bands will suffer.). Jan 25, 2013 - The stock antennas that come with your handheld and base scanners are. Stores sell TV antenna mounting kits that work great for this purpose. Other locations that work would be a mast of 10 or 20 feet planted in the ground.
I have a 15' LMR 400 lead attached between the antenna and the lightning arrestor which is mounted on the leg of the tripod which is mounted on my porch roof. The tripod is holding up a 10' piece of chain link fence top rail for the mast.
There's another 100' of LMR 400 running from the lightning arrestor to the antenna switch located next to the radios. The SSB CB locals are very impressed with the quality of signal this antenna is putting out. Many of these are about 30 or so miles away. I also get fantastic reception on the VHF radio, which is what I primarily monitor. I have no idea how well this works transmitting VHF because I'm not licensed to transmit on the marine bands from land, so I won't even test it. My VHF radio has a bad microphone which doesn't affect my ability to monitor the airwaves.
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The SDR works very well but I was getting a lot of interference from my local FM radio stations so I put the FM reject filter in which really does a great job eliminating the interference.The post install video is at.
::Antenna Tutorial PageWelcome to our Antenna Tutorial. I'll try to make this as quick and 'no brainer' as possible.Page Outline:.:An antenna is an electrical device which converts electric power into radiowaves, and vice versa. It is usually used with a radio transmitter or radioreceiver.
In transmission, a radio transmitter supplies an oscillating radiofrequency electric current to the antenna's terminals, and the antenna radiatesthe energy from the current as electromagnetic waves (radio waves). Inreception, an antenna intercepts some of the power of an electromagnetic wave inorder to produce a tiny voltage at its terminals, that is applied to a receiverto be amplified.Antennas are essential components of all equipment that uses radio. They areused in systems such as radio broadcasting, broadcast television, two-way radio,communications receivers, radar, cell phones, and satellite communications, aswell as other devices such as garage door openers, wireless microphones,bluetooth enabled devices, wireless computer networks, baby monitors, and RFIDtags on merchandise.Ok now that we have the boring technical jargon out of the way, let's get tothe meat of the matter - 'which antenna do I need'?
I'm glad you asked.let'sexamine the fundamentals and then take a look at some examples of two way radioantenna connections so you can easily determine what type connector you currentlyhave on your radio or what connector you need for your new purchase.(vehicular mounted antennas):Before we get started please remember one important thing: 99.9% of two wayradio failure is due to either the antenna being improper (meaning it's not madefor the frequency used) or the antenna has not been tuned properly toaccommodate the transmitting frequency. Your antenna is the most important partof your two way radio system however it is often the most overlooked component.Getting the antenna right is 100% critical to not only achieving goodperformance but also maintaining the life of your equipment. If you are acomplete novice when it comes to two way radios and antennas you would be wiseto take a few minutes and read the material provided here. A few minutes ofreading may save you a big headache in the future; not to mention money.With regard to antennas the basic rule of thumb is, the taller (or larger)the antenna is, the more db gain it produces.
We won't go into antenna theory atthis juncture, but if you are interested in learning what db gain is pleasevisit our antenna theory page. However for right now let's just keep thingssimple.again, the taller the antenna, the more db gain it will produce. Themore db gain, the better the performance. Now there are exceptions to this rule, but only insome unique circumstances (which is explained ). So, ifyou want to 'reach out and touch somebody' (meaning you want to reach out as faras possible with your two way radio) than you want the tallest antenna with themost db gain you can afford or tolerate (as far as antenna height goes). You mayhowever want totake into consideration your garage at home that you plan on parking yourvehicle inside for antenna height; not to mention the McDonalds drive thruwindow. So basically it's a give and take: taller antenna works better (in mostcases), however it could possibly interfere with your busy lunch schedule whentrying to navigate the fast food drive thru window.Second rule of thumb when it comes to vehicular mounted antennas isfundamental; mounting location of the antenna.
The best place on any vehicle tomount your antenna is on the very center of the roof of the vehicle. For optimumperformance one would mount the antenna on the center of a metal roof. If youhave a metal roof than great! If not, what do I do then?
Good question.In thecase you don't have a metal roof (such as fiberglass or plastic) than you wouldwant to use a 'no ground plane' antenna. No ground plane antennas are speciallyconstructed to work in situations where there is not a suitable 'ground plane'available. A ground plane being a metal surface positioned around the base ofthe antenna that the radiating signal reacts with.
If you have a metal roof it'salways best to stick with a traditional antenna. The website here is categorizedby the different types of antennas available so if looking for a no ground planeantenna one would look in the 'no ground plane antenna' section of the website. This rule of thumb for 'no ground plane' antennasapplies equally to non-metallic roofs as it does to antennas mounted 'out in thebreeze'; such as mounting your antenna on aor in any mounting location where a proper ground plane cannotbe achieved.
Now don't get confused between 'no ground plane' and grounding;such as grounding an electrical component. No ground plane when it comes toantennas is: a metal surface surrounding the base of the antenna in which theradiating signal reacts with. Example of asituation. Example of asituation.
There are also ground plane 'available that will add a suitable ground plane to a non metallic surface in thecase where one desires a standard antenna. For more information on what a groundplane is please visit our antenna theory page.Next thing one needs to consider is the frequency or frequencies that oneneeds to transmit on. Now that you know what your center frequencyis, you would look for an antenna that is made to operate at 154.000 MHz. Ourexample antenna above would be a suitable antenna because it has an operatingrange of 144-174 MHz.The above example works for picking out virtually any antenna available nomatter the frequency.However, there is also another very important factor to consider: how wide of arange of frequencies do you use? In other words, does the difference between thehighest frequency you transmit on and the lowest frequency you transmit onexceed the antennas operating bandwidth? Let me explain.The example we gave above;, has a useable bandwidth of 6 MHz. Meaning it can be usedin a situation where the highest and lowest transmitting frequency does notexceed 6 MHz of separation.
Example would be; 152.000 and 158.000 MHz. In otherwords your lowest transmitting frequency is not below 152.0000 MHz nor does it exceed 158.0000MHz. Another example would be: lowest frequency is 153.2750 and highestfrequency is 157.950. In this case an antenna with a useable bandwidth of 6 MHzwill work in this scenario. However let's say your lowest transmit frequency is151.2750 MHz and your highest transmit frequency is 159.6250 MHz.
In this case ourexample antenna with only 6 MHz of useable bandwidth will NOT work. Now you might say 'Ok, nowwhat do I do'? Good question. There's an answer to that problem as well.
It'scalled '. Same center frequency calculating method applies as above butwhen our bandwidth exceeds 6 MHz we need to look for a wideband antenna. Somemodel antennas we carry may have a useable bandwidth of up to 20 MHz (meaning you couldsafely operate from 150-170 MHz forexample), while some are as wide as 38 MHz (meaning you could operate from136-174 MHz). There are also wideband - no ground plane antennas available aswell.
A combination no ground plane antenna that has a wide bandwidth. Neat huh?Ok, so a person might say at this point; 'Why do I have to go thru all thismess just to pick out a stupid antenna'? 'Why can't I just use any old antenna?' Remember what we explained earlier?
Diy Scanner Antenna Booster
That 99.9% of two way radio failure is dueto a poorly mismatched antenna? This is because of another rule concerning twoway radio - SWR (Standing Wave Ratio). Havinga high SWR as a result of a poorly matched antenna will be the death of yourradio. So just remember to use the material provided here when choosing anantenna and you'll be just fine.