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Posted on Nov 06, 2008
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Sideband carrier?? when i go to either lower or upper sideband i have like a 5lbs carrier,,can someone please tell me why,, and can i tune that out or what,,:??? thanks,. paul..

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  • Posted on Jan 10, 2009
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Im not sure carriers are measured in pounds, but SSB is a supressed carrier mode, in SSB only one sideband is transmitted and the carrier is inserted at the other end in the receiver. In AM mode the carried and both sidebands are transmitted. with regular am there is a carried and when modulation (your voice) is added a signal appears both above and below the carrier frequency at a distance relative to the frequency of your voice. so if you have a carrier at 1000 khz and modulated it with a tone of 100 hertz the signal will contain frequencies of 900,1000, and 1100 hertz, then its changed to SSB by supressing the carrier (1000) and one sideband (1100) if you are on lower sideband and (900) if you one upper sideband, and transmits the remaining frequency.

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Why does my galaxy 949 seem to be off frequency when I am using lower Sideband

Each channel is a AM carrier frequency which is the center frequency of the channel. Each AM frequency has two sidebands, a lower sideband which is the below the center frequency (AM) and a upper sideband which is above the center frequency.
See the following for some explanation of sidebands:
https://en.wikipedia.org/wiki/Sideband
Hope this helps and 73
Jim
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you will be better off taking this to a tech considering it is a ham radio also. he can set the freq and put it on a distortion meter also to find out the problem.
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Uniden washington cb

Is it off on both upper and lower sideband? how about AM? Did someone mod it so that the clarifier works on transmit too? Hope not.
If it is off on LSB adjust CT2 next to C104 and for upper side band CT1 next to C105. You will be tweeking on a capacitor in series with a crystal. caution as it could stop it from transmitting (oscillating) if it isn't set right. best if you use a frequency counter to see if the stage is working right on frequency. Here is a diagram hope you know how to read one. If you dont and you attempt to tweek on this and that, you have a great chance that you could foul it up to the point it wont work at all or sound really bad. The main thing is to narrow it down where the problem is: Is it just LSB or USB or both? If both do not tweek on C1 or C2. I would say it is the 11Mhz crystal area. meaning the problem could be a bad varactor diode, even a resistor or capacitor failure in that portion couldmake it off frequency as the varactor is voltage controlled. By varying the voltage to it, the capacitance changes and therefore changing frequency.
If both uper and lower sideband are off then I suppose AM is off too. the reason you are not being heard as well. Adjust CT3 to bring it back on frequency. You got it CT3 if upper and lower and AM is off or if only lower is off CT1, if only upper is off CT2.
Good luck. I am not responsible for your actions. I am only giving my opinion and logic on this. here is the diagram, dont hurt yourself.....
http://www.cbtricks.com/radios/uniden/washington_mb8719/graphics/uniden_washington_mb8719_sch.pdf
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SWR overload on sideband

Try a different antenna, my thinking on this is that the antenna has an issue where it can deal with the 4 watts of CW power and not the extra PEP on SSB mode.
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Is it best to use in am mode in normal trasmitions on a cb radio dx 959 galaxy?

  • This Galaxy was built as a CB to run on AM (11 Meter). The majority of people on the CB run AM stations. Sideband (upper and lower) is where the carrier is removed and the wave being transmitted on is cut in half. You can do this just fine but mainly if you want to talk to someone and you both know your going to be on Sideband for a little privacy. 38 LSB is a great channel to catch some DX side band on world wide. But yea, AM is the best to find people to chat with.


  • If you have any comments please feel free to leave them here.
  • Hope this helps and thank you for using FixYa.
Regards, Tony
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How to use ssb usb am cb radio

  • Well, AM is Amplitude Modulation and Sideband suppresses the carrier and uses only the top half (upper sideband) or lower half (lower sideband) of the wave.

  • Whether using AM, USB or LSB you are on the same frequency although if someone is on USB and you are on LSB you will not be able to understand what the other person is saying because you are using different parts of the wave. So 27.185 (channel 19) on AM, USB or LSB is still 27.185.

  • If you have further questions please let me know.

  • If you have any comments please feel free to leave them here.
  • Hope this helps and thank you for using FixYa.
Regards,
Tony
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1answer

Looking to find the frequenecies of the upper and lower channels


  • Hi I can help.
  • For the Grant 40 channel CB there are 40 frequencies I will list below.
  • When you refer to the upper and lower channels for this raidio you must mean USB (Upper Side Band) and LSB (lower side band).
  • This is called single side band modulation which is to say the the carrier is removed from the upper or lower sideband depending on which your pick and the signal goes farther on less power.
  • So the upper and lower side bands are the same frequency just upper side band or lower sideband.
  1. 26.965 MHz 21. 27.215 MHz
  2. 26.975 MHz 22. 27.225 MHz
  3. 26.985 MHz 23. 27.255 MHz
  4. 27.005 MHz 24. 27.235 MHz
  5. 27.015 MHz 25. 27.245 MHz
  6. 27.025 MHz 26. 27.265 MHz
  7. 27.035 MHz 27. 27.275 MHz
  8. 27.055 MHz 28. 27.285 MHz
  9. 27.065 MHz 29. 27.295 MHz
  10. 27.075 MHz 30. 27.305 MHz
  11. 27.085 MHz 31. 27.315 MHz
  12. 27.105 MHz 32. 27.325 MHz
  13. 27.115 MHz 33. 27.335 MHz
  14. 27.125 MHz 34. 27.345 MHz
  15. 27.135 MHz 35. 27.355 MHz
  16. 27.155 MHz 36. 27.365 MHz
  17. 27.165 MHz 37. 27.375 MHz
  18. 27.175 MHz 38. 27.385 MHz
  19. 27.185 MHz 39. 27.395 MHz
  20. 27.205 MHz 40. 27.405 MHz.
  • If you have any comment please feel free to leave them here.
  • Hope this helps and thank you for using FixYa.

Regards, Tony
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Sideband freq

That is wrong , I used to have a freq. counter that only read when you applied RF to it on my old Tempo rig and I ran lower 37 and upper 35 so I would key the radio on am and tune the vfo to that frequency and would be on frequency with everone else,I remember hearing that once long ago but it's not true.
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