Question about Kenwood TK-3102 4 Watt UHF Professional Two-way Radio 2 Way Radios

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Is there much of a difference in performance between a 25 watt and 50 watt two way uhf radio with a 5 db antenna?

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Doubling Tx power, as you might suspect, doesn't double the transmit range.

As a rule of thumb. you should see about 1/3rd increase in range.

In practical terms, this doesn't usually give you something you didn't have before. it generally just "cleans up" the noisy signals at the fringe coverage areas.

Hope this helps,

Posted on Jul 19, 2012


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Posted on Jan 02, 2017


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Bought a new galaxy dx98vhp had peked and tuned

Well it sounds to me like you may have a ground plane problem, or whomever "peaked" your radio may have messed with something they shouldn\'t have causing your poor reception. You can try trimming your antenna to get a better SWR, but you also might want to look at your antenna mounting. It may be in the wrong area of your vehicle. Where the antenna is mounted is very important, more so for recieving than transmitting. Is it a magnet mount or is it installed permanently? Where you position the antenna will affect it\'s performance as will the ground plane. If it\'s a magnet mount, it will work best on top of the vehicle roof in the middle of the roof, or in the middle of the trunk. The nearer to the edge of the vehicle, the more ground plane you lose. Where it\'s mounted and how it\'s grounded could even make it directional. Does the antenna have a coil? Is the coil right next to your back window? If so, you need to move it. Try different areas of the vehicle for performance. If your antenna is permanently mounted, it will not work well if it\'s mounted on a corner, or on the edge of a truck bed etc. Ground it with heavy wire to the frame of the vehicle and make sure that the area you make the ground has been cleaned of paint, rust, dirt etc. You want to see shiney bare metal, and when you find the right place to mount it, seal your ground with rubber undercoat spray to prevent rust from messing up your contact with the frame. Your antenna will always work best if mounted in the middle of the roof or trunk where it can use the sheet metal as a ground plane. As far as how far you can get out, that depends on how much power the radio puts out, and how clean your audio signal is. 1.4 swr is OK but it can be much better. If the power was "peaked" too high, your audio is going to suffer in clarity and overall quality. You\'re best off leaving the radio alone and getting an amplifier. Ten watts of ugly power is not going to sound anywhere near as good as 5 watts of clean power, and the extra 5 watts gets you very little extra distance if any at all. To increase an audio signal by 2db, the power of the transmitter needs to triple. For instance, if you are recieving a signal at 2db from a 100 watt radio, the power would have to increase to 300 watts to give you a 4db signal, and you know that a 4db signal isn\'t going to be a whole lot better than a 2db signal as far as being able to hear what is being said. So the difference between having 100 watts and 300 watts is only 2db. And heres where the cleaner audio is going to really pay off. A 6db signal with crappy audio will sound worse than a 4db signal with clean audio. So the radio with the clean audio will sound much better than the radio with twice or 3X the power with crappy audio. So you\'re really not getting much if anything by having your radio "peaked". You may have even ruined your radios audio if the guy doing it is a power freak and doesn\'t understand how good radio signals work, and he pushed your radio to it\'s limits. Get an amp and leave the radio alone. Have it put back to stock and get an amplifier (and don\'t have your amp "peaked")! You\'re better off with 5 watts of clean than 10 watts of dirty. Get your antenna situation fixed and try to get the SWR better and you should be good to go.

Sep 02, 2014 | 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.

on May 04, 2011 | Radio Communications

1 Answer

What is the difference between GM338 and PRO7100

GM338 is an Asia/Pacific model. Available Lowband, VHF, UHF, in 1-25 or 25-45 watts.

PRO7100 is a Latin American model. Can program in English, Spanish, French and Portuguese. Available in 200 MHz, VHF, UHF, 700 MHz.

These are very similar to the CDM1250 mobile for use in the United States. The PRO7100 and GM338 are not type accepted for use in the United States.

Feb 10, 2014 | Radio Communications

1 Answer

I pulled u uhf out of my vehicle and replaced it with a pro 520 xl uniden uhf but it won't work.

Check your electrical connections and your antenna set up first. Then if you still have a problem, check your mic/mic plug. Lastly, check your programming. If you have ignition sense programmed into the radio you will need to wire it accordingly, so it will sense the ignition of the vehicle.

Best regards.

Sep 13, 2013 | Motorola UHF 1-Watt, 1-channel Radio

1 Answer

How many watts in a Kenwood kac-9104D

Kenwood KAC-9104D

Product Features
  • Mono subwoofer amplifier
  • 500 watts RMS x 1 at 4 ohms (900 watts x 1 at 2 ohms)
  • Variable low-pass filter (50-200 Hz at 24 dB per octave)
  • Bass boost (0-18 dB at 40 Hz )
  • Subsonic filter (15/25 Hz, 18 dB/octave )

Jun 29, 2011 | Kenwood Car Audio & Video

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Doesnt transmit very good

First make sure your SWR is nice and low 1-1:5 is recommended and no higher than 2. You can loose up to 50% of transmission with a high SWR. Your set up is as only as good as your antenna. I like the Wilson model antennas myself but there are many good antennas out there. The radio you have may have never been peaked or tuned. Even new they are far from the legal limit or 4watts swing 12 watts PEP. Also, don't be discouraged by those saying you are not getting out. Most these days have a far more watts coming out of the back. So their standard may be different. You can take your radio to a licensed tech and have it peaked and tuned. With the radio you have, it may be more (in value) than the radio itself is worth. But you will get more power out of it. Good luck.

Jan 22, 2011 | Cobra 19 DX IV CB Radio

2 Answers

How to get a Talkabout T5720 to communicate with a

The frequency range and operatngmode of the two radios are compatible. To get the Radius operating on a GMRS channel you'll need a Motorola programming cable and software, OR a trip to a Motorola dealer for frequency programming. Considering the cost involved, the 2-watt output of the Radius, and the 1-watt output of the Talkabout, you would be better off performance and cost wise buying a pair of 5-watt GMRS portables.

Jan 11, 2010 | Motorola Talkabout T5720 (7 Channels)...

1 Answer


Any programmable UHF 450-470MHz mobile radio could be programmed to the frequencies of the Spirit MU series radios.

Your radios are 2 watts, so you would probably want to stay with a 1-10 watt, or 10-25 watt mobile radio, to have the best success. The current compatible model for Motorola is the CM200 UHF radio. If you are looking at a used radio, just simply watch for it to be UHF 450-470 MHz.

Then when you are ready to have the mobile radio programmed, the dealer (or programmer) will need to know the settings of your MU radios. These are easily read out over the phone, or in person by an experienced programmer.

Dec 13, 2008 | Motorola MU21CV (1 Channel) 2-Way Radio

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