Tip & How-To about Radio Communications

Cb ranges in mileage.

I have experimented for many years with various antennas and gain in the frequencies 26.965 to 27.405mhz. I have found that best performances on the Citizens Band is upper channels 37 or 39. This is where the band gets quieter and more close to Fm type communicating. Performance in antenna and hearing is best here. The Antron A99 sitting just 15 feet will get you 50 miles with decent results on a cheap Cobra 19plus or Cobra 21LTD. I can tell you by fact that a Cobra 21Ltd is equal to Cobra 25Ltd's(don't let noone tell you different) Its the same board, same calibration, same wattage plus its about $15 or so dollars cheaper than. Antennas have to be set for your frequency. I have found that the 8.5 ft(102 inch) steel whip performs best at approximate Channel #37 to 40. Homemade antennas built with a 8.25 ft element and 2 8foot rods down the side(ground) with a rod crossing the bottom at 1.5 feet. In the shape of a womans skirt.( Do not let the ground "skirt" touch the pole,seperate it by plastic PVC or milk jug with trash bag ties) I got 50 to 60 miles with this homemade job I would say had a DB gain of 10dbi. I have built home antennas that outperform Antrons. To be safe though and quick to setup is Antron A99 for about $65. Antrons have already set the frequency and low SWR. !!!DO NOT TUNE ANTRON A99 - IT BREAKS INTERNALLY!!! The average range one can get is say 10 to 50 miles average(best at night 10pm to 3 am) Don't expect any better with a Superior radio and tower or linear. A linear may kick hard within 25 miles but after that it fades into low in the distance. Unless you use 10 kilowatt or 25 Kilowatts(Electric bill will increase by $300 more--who needs it) A good power Mic on a straight radio Cobra 21LTD or 25 Ltd will be better than any mid-size linear say up to 250 watts. Your radio itself has potential with antenna gain of equal 25 to 45 watts alone. Mathematically your best with a Super Antenna and Height above 35 feet, plus heavy grounding(chain link fence buried into earth 20 X 20 feet about 8 feet down(a rod 8ft also will work) or if possible a Junk car buried into earth 8-10 feet under your Antenna. Use heavy gauge thick LOWLOSS 50 ohm coax 95% shield less than 100 feet to achieve max power out. Lengths in coax are great at 9,18,27,36 up to 72 feet(No higher than needed) The old timers swear by 72 feet. Antenna Height say: 45 feet tower with 72 feet of Coax is the usual Base setup. FCC restricts antenna towers to 60 feet above ground. No more than 20 feet above your house somewhat(when attached to house roof). No need to put $10,000 dollars in a setup with no more range than others. A mobile radio(Tuned) with Antron A99 will about outdo all Base station radios. Hope this helps you. 73's to you all.

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This wireless router is in our study where we have a PC and there are not any problems with the signal in here but if we use a laptop in another part of the house, at best we only get a weak signal which we lose and most of the time we can not get a signal. Is there anything you can suggest to boost the signal?


It would be good to know the model and make of your router. This would indicate which of the 802.11 standards it is capable of. These standards are indicative of the routers range. Range can be impeded by environmental issues like walls, appliances and wireless phones that are on the same frequency. Wireless phones can operate on the same 2.4Ghz frequency as a wireless router hurting its range.

Now, as for a fix. Depending on the router, it may be possible to replace the antennae with a higher gain antennae. If the router has a standard connection, a replacement can be purchased. If the router is one of the earlier standards (A, B, or G) you may want to considered a newer router for example a Wireless-N with MIMO router. Often these have multiple antennas to help improve performance.

Please respond back with your routers information if you would life more input.

Jan 18, 2011 | Computers & Internet

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Hi, I am thinking of buying a dx-95t. I am a novice but I do not want to start with some rubbis and upgrade later. It would be used in a house in Budapest Hungary to communicate with friends locally or around the world. What antenna(s) and others woud you suggest to go with it for local and/or long distance. Obviously the manufacturer suggests the most expesive product to sell. That is why I ask you. I would appreciate your help. Best regards. Michael.


To be able to get the same distance in all directions for local use the best type of antenna is a vertical with as much gain as possible. Most makers quote gain in db and this means how much better the antenna is than a plain wire antenna. This antenna will also work for dx on sidebands but the signal goes out in all directions the same distance.

If you want to get a longer range in one direction you have to sacrafice the distance in other directions. To do this you need a directional beam antenna. There are several brands with very little between any of them. What you need to be looking at, if you decide to use a beam type antenna is either "yagi" or "log periodic array" antennas. These are types of antenna rather than brand names. The log periodic array will give the longest range and the yagi will give the next best. Log periodics are very expensive but give the best results. Yagis come with different amount of elements. The more elements it has the better it works but even yagis with 3 to 4 elements give significant improvements over vertical antennas. Because both these type antennas concentrate the signal in one direction you need to be able to rotate it to the direction you want to send, and receive, the signal unless you only want to send it one direction. This means that you might need a mast and rotator which allows you to turn the antenna from a control beside the radio. These make the hobby even more expensive so it depends on how much you can afford to spend. Also make sure that the antenna you buy is resonant on the frequency you'll be operating on i.e. 27Mhz. Otherwise you'll burn out your radio. If you google the different types of antennas you'll find places selling them. You can also buy an antenna tuner that matches antennas to your radio if the frequency is not exactly matched to the radio. It reduces your power out a little but makes very little difference to the range of your signal. Also get the antenna as high as possible to a maximum of 30 feet. After that the gain is offset by the loss of signal through the co-ax cable. Use low loss co-ax cable to reduce the amount of signal you lose between the radio and the antenna.

Having said that I've contacted America from the west of Europe several times using a vertical antenna so you might not want to go for the best.

You need to be aware that there's an eleven year sunspot cycle which affects the long range radio communications. At the height of the sunspot activity you'll get long ranges without any difficulty and at the low you'll rarely get long range. At the moment we're just coming out of the low so it will be another few years before we reach a high. Just don't judge your dx activity on how well you do at the moment.

Good luck with the radio and if you enjoy it consider becoming an amateur radio operator. It gives you more frequency bands to use so the sunspot activity doesn't limit you so much as other frequencies improve with low sunspots. I started off with CB and am now an amateur radio operator for over 30 years.

Jan 15, 2011 | Galaxy Radios DX-95T Base CB Radio

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what frequency do i need to have my speakers on??


Different speakers perform better under different frequencies.
The sound you receive also depends on the box you use, and the type of car its in. In my opinion the best sound is what "I like" not what others set.
There is two ways of finding your optimum settings.
But my favorite way is to do the following.
1) Set every frequency on radio, preamp, cross over to amp and 0.
2) Turn the volume to about 50% - 75% using a song with different types of base.
3)Adjust your base gain, sonic, boost, punch or what ever settings until it sounds it's deepest. Don't over do the gain or base boost.
4)Adjust the other setting to fine tune clear sound.
5)Add the highs to see if they match up.
6)Now fine tune the amps but remember you should only need to bring the gain up or down because you had already found your deepest base. This should be the last amp adjustment unless u realize u want it lower or higher.
7)Adjusting the equalizer or EQ on the sterio will depend on the song your playing.
Note: It's best to max out at about 80%-90% sterio volume.
"I max out at 60%, but that's because I don't like twisting and twisting to get my sound up or down." One twist and im setting off car alarms.

Mar 16, 2010 | Car Audio & Video

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using an older motorola two-way mobile radio with


Rule of thumb: Height and placement of the antenna determines the range. If your FCC license allows, raise the antenna.

As for types of antennas, there are a variety depending on the situation. (Too many to list.) Common would be Unity Gain (aka quarterwave), 3db gain and 5 db gain. Each has their own advantages according to placement and terrian. Talke to your local radio professional or call one of the experienced online companies to get some advice according to your particular situation.

Lastly, be certain your antenna is tuned to the frequency you are using. This alone can add range to your radio.

Oct 16, 2009 | Motorola Radio Communications

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When auto tuning my LG LST-5403P dvr I can not get the ABC channels. It worked correctly until my wife decided to go thru the auto tuning process!!! The missing channels can be picked up at the TV but not selected by auto tuning so it is not an antenna problem.


Hello,

The ABC channels arrive on a different Harmonic than Analog signals; specifically the third Harmonic. When you auto tuned, the auto tune chip looks for stron analog channels on the first harmonic and any other strong signals. However the LG model is notably poor at capturing 3rd Harmonic signals.

Harmonics are different frequencies where the same signal can be captured. Making this overly simplified: a frequency multiplied by 2 is a harmonic and that multiplied by 2 is also of the same harmonic; inversely dividing by 2 and 2 gain and so on finds harmonics down in light wave frequencies.

You may be able to manually tune these ABC frequency channels manually (I do not know, as I live in the US and have no direct experience with this) and then add them in one by one. But, using the Auto Tune feature again will wipe those out. The same thing happens to other weak signals, which harmonic is actually (its on an offset carrier wave).

I just read of a man who built an improved antenna and put this in his attic and received ABC channels quit well. A decent understanding of Antenna physics is required, but it only took up 1.5m wide by .8m (sic) long. In a nutshell he improved his basic antenna by building his own more sophisticated antenna.

Shopping around and asking in the shops should get you an antenna add on that will work for you.

As I stated before I live in the US, and we don't have this, but I and others here at fixya have various experience in amateur radio.

I will ask a friend of mine who lives in Australia to confer with me on this problem of yours so he can add some value to our response to you.

Regards,
Worldvet

Oct 23, 2008 | Televison & Video

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