Question about Radio Communications

2 Answers

Does anyone know why a Bearfoot 3 cb amplifier is not working ?

This amplifier has tubes in it that light up but it doesn't send the cb signal out far enough, it only sends it a couple of miles when it should go farther than that. I know that there is a possibility that the tubes could be weak.

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  • John L radiodude365 Apr 05, 2019

    RG8x coax is very good. The other should be fine. I may not have been specific enough about the roof and antenna: the tip and body of the antenna should not be near the roof. The bottom of the antenna could be on the roof. In fact, the bottom would benefit from the metal roof in reflecting the signal out. The radio transmits and the signal goes out the antenna. Having a metal roof for it to "bounce" off of would increase the range. If the antenna is under the roof at all, it would bounce back inside. Let me know about the antennas.

  • sherman north Apr 05, 2019

    I told you we have tried it on two different antenna's , here is the antenna that has a set screw in it near the top portion of the antenna that will allow anyone to adjust it up or down so much . Here is the type of antenna we have, Sirio GPE 27 5/8 26.4-29 Mhz Tunable Base Antenna with 100Ft RG8x Mini Coax.
    You can find this antenna on Ebay, that is where we ordered it.
    We have it set to the maximum height , do you think if we move it down it might work better ?
    Should it be moved down in small mllimeters or how much if we adjust it ?



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It obviously works, so it is NOT a fuse. The most likely cause is a poor antenna connection. This happens often. Unscrew the antenna. Use a continuity meter to check check each connector. Such as the one that screws into the radio, if the continuity meter "beeps" the connector is "grounded" and was installed improperly. Do not use that antenna until you fix it, you could blow the transmitter by using a "grounded" connector. Test it exactly the same way without the antenna attached. If you are not used to installing connectors, you could easily go through 2-6 before you get the hang of them.

Posted on Mar 28, 2019

  • 14 more comments 
  • sherman north Mar 30, 2019

    I bought a Watt Meter & this Bearfoot lll is putting out about 80-85 watts, it would not get a signal to go 15 miles.
    Do you have any idea what the problem might be ?

  • John L radiodude365 Mar 30, 2019

    Having a watt meter, well how many places did you test? Are you connected at the back of the radio? There is that point, the antenna and every single connector is still suspect. Reflected power using the watt meter will tell you what is wrong. I do not advocate breaking the law, ignoring the FCC Rules and Regs and the interference you may be causing (80-85 watts) means I will not be providing you any more advice. (Really am a two-way tech) I do wish you luck and hope it all works out.

  • sherman north Mar 30, 2019

    I am doing this friend, it couldn't be putting out 80-85 watts, something wrong.

  • John L radiodude365 Mar 31, 2019

    Did I misunderstand? I thought you said the wattmeter said 80-85 watts. So, flip the switch, and tell me the reflected number. If the needle moves, you have an antenna or connector or ground issue. It could also be all of them. Wattmeters are wonderful tools! A radio can transmit 100 or more watts and not talk 50 feet. I have had it happen. Especially in the lower frequency bands, such as CB, you need a larger ground plane. The more power, the more critical this becomes. Just a thought to keep looking.

  • sherman north Apr 01, 2019

    Do you mean the SWR switch, flip the SWR switch to on ? Is this correct ? thanks for your answers

  • sherman north Apr 01, 2019

    This is the Watt meter Nissei RS-27 CB/10M 1KW SWR & Power Meter 26-30 MHz for Mobile/Base Radio

  • sherman north Apr 01, 2019

    I checked the SWR on channel 1 & checked it in channel 40.
    The SWR on channnel one was 2
    The SWR on channel 40 was 3
    Is this good SWR readings ? Thanks for your answers

  • John L radiodude365 Apr 01, 2019

    darn, I was hoping for a little higher reading. 4-5 or more means a definite problem. 2-3 may mean there is a problem or nothing is wrong. Ok, looked at the watt meter. 3 on that one means there likely is an issue. To check the connector, do you have a continuity meter such as on a multimeter? If so, unscrew the connector to the amp and unscrew the antenna. Touch the probes to the center and outside of the connector. If it beeps, cut it off and install a new one. Test using the multimeter again. If all that works, then we look at the antenna and ground plane. A bad antenna could also cause ALL of these problems, but I see bad ones so infrequently, I did not start with that. Do you have another antenna you could install to see if it transmits further? If not, can you install the watt meter inline? That means amp to wattmeter, to the antenna. If so, get me the SWR again.

  • sherman north Apr 01, 2019

    Everything checked out alright, I did check the continuity, nothing is open or shorted.
    The resistance through the antenna wire & the antenna is .9 ohms , I've tried to different antennas and getting the same results. Thanks for your answers

    Someone told me that the SWR should be 2 or less on channels 1 & 40 .
    Is that true ? Thank you

  • John L radiodude365 Apr 02, 2019

    SWR should always be low, I tried for lower than 2 always. No idea why channels 1 & 40 would be different, they are so close in frequency, yet CBs can be different than FM radios. Well, I am stumped! If the radio transmits, the antenna and coax cable is fine, then I want to look to the outside world. Get the antenna outside as high as you can, coax length can be an issue over 30 feet, so you may need to go to a thicker coax. Speaking of coax, what are you using and how long is the run from radio to antenna?

  • sherman north Apr 02, 2019

    One of the Coax cables is 100 ft. long on 1 antenna I sent you info. on but the other one is less than 30 ft. on the other Antenna.
    Can the SWR be lowered by lowering the antenna tip, sliding it down a couple millimeters ? Thanks for your answers

  • sherman north Apr 03, 2019

    When I mentioned the antenna tip, I mean the top part of the antenna that has a screw in it to make adjustments up or down on the length.

  • sherman north Apr 03, 2019

    Would a metal roof near antenna cause any problems ? I know that TV antennas do not work good around or in trailers because of the aluminum.

  • John L radiodude365 Apr 04, 2019

    Yes, familiar with the screw tip antennas. I always use the manual to adjust. Dual antenna setup can be tricky to balance the antennas and I have not done high power CB with duals for many years. Coax length could be an issue, but how big or thick is the 100 foot run? RG 58 or RG 8 or?? About the size of a pencil or bigger than a pencil. The long length will lose power in the cable if it is small. Metal sheds, roofs, dish or directTV antennas, etc. can cause issues. Somehow the RF (signal you transmit) can jump to metal, much like an arc but you cannot see it. The antenna would need to be close to the metal. It could mess up your transmit but not your receive signal. Again, with duals, I cannot remember how to adjust them. I know you are on the right track. It is going to be something simple, like the coax or the metal roof.

  • sherman north Apr 04, 2019

    The antenna is right against to eave of the house near the metal roof on both antennas.
    Here is the info. on one of the antenna's and the coax that came with it, it's small coax.
    Here is the info. on both of them, Sirio GPE 27 5/8 26.4-29 Mhz Tunable Base Antenna with 100Ft RG8x Mini Coax

  • sherman north Apr 04, 2019

    You can find this antenna & coax on ebay. That's where I purchased it.


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It cud be because a fuse is not working properly, you can find the same model or new model here>>>

Posted on Mar 28, 2019

Testimonial: "It couldn't be the fuse or it would not at all, I've already been to ebay looking."

  • sherman north Mar 28, 2019

    It couldn't be the fuse or it would not work at all, I've already been to ebay looking.



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