Galaxy Radios DX-2547 40-Channels Base CB Radio Logo

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Posted on Feb 21, 2009
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Sideband freq what freq is channel 19 lower sideband am is 27185.0 i was told it was three points diff and i cant find nothing that tells side band freq i would love to have them for all chan

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  • daylonrrober
    daylonrrober Feb 28, 2009

    i have ask alot of people and nop one knowa the freq i still would love to get them

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  • Contributor 39 Answers
  • Posted on Feb 21, 2009
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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.

  • gord smits Nov 28, 2011

    basically, an AM signal is composed of a carrier signal, an USB and a LSB. If you delete the carrier and (say) the LSB you are left with the USB which occupies from the carrier frequency UPwards to the limit of your audio signal (lets say, 2.5Khz) so your signal goes from 27.185 to 27.1875 (ie. 27.185+2.5Khz). On LSB your signal would occupy the slot 27.185 to 27.1825 (ie. 27.185-2.5Khz). On AM your signal occupies from 27.1825 to 27.1875 or about 5Khz, Thats one reason SSB is more efficient and quieter than AM.

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Related Questions:

0helpful
1answer

Can't get freq numbers and channel numbers to match on dx66v
so,what numbers does it show? If you are at 27.187 or 27.183 it should be no problem that little amount of frequency differance won't make any differance. Now if you were at 27.180 or 190 then you would be going into another band width.
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Apr 01, 2014 • Galaxy Radios DX-66V Base CB Radio
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1answer

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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Oct 01, 2011 • Galaxy Radios DX-959 40-Channels Base CB...
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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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Aug 29, 2011 • Uniden GRANTLT 40-Channels Base CB Radio
1helpful
1answer

Galaxy 99 has same frequency 27.185 on am also on upper side and lower side band how come?? thank you
The frequency doesn't change when you change to USB or LSB. Basically the AM frequency takes up a certain amount of space, known as bandwidth, so it could fill in for example use 50 hertz above and below 27.185 giving 100 hertz bandwidth. When you use sidebands the am bandwidth is split in two so the upper side band would use the 50 hertz above 27.185 and the lower side band would use the 50 hertz below. The idea is that twice as many operators can operate without interference.
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Sep 17, 2010 • Galaxy Radios DX-99V 40-Channels Base CB...
1helpful
2answers

In Thailand Cb radio users must use freq range 245.000 - 249.999 freqs. Do usa Cb's use this freq?
Thailand actually has three "CB" bands, the first is the same as the U.S. / CEPT (EU "European Community) band 26.965 - 27.405 MHz, the second is a 78MHz VHF mid CB band (I think its either 40 or 80 channels with FM mode) and then the 245.0000 - 245.9875 MHz VHF 80 channel band - apparently the law also stipulates that the 78MHz CBs must be yellow colored and the 245MHz CBs must be red colored.

But yeah, 245MHz Thailand VHF CBs are very illegal in the United States.
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Jun 24, 2010 • Cobra 19 DX III 40-Channels Base CB Radio
0helpful
1answer

Bought used and don't know how to use as far as channels
high band and D will give you channel 19 freq. 27.185.
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May 08, 2010 • Galaxy Radios DX-33HML 40-Channels Base CB...
0helpful
2answers

Connex 3300 hp
U mean on sideband? Frequency counter only useful on other than sideband operation. This does not mean the carrier insertion osc. is on frequency. If it needs adjustment, your voice will sound high/ low on transmit. Incoming signals will sound right after adjusting the osc.
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May 14, 2008 • Connex 3300 240-Channels Base CB Radio
1helpful
1answer

Scanner(POLICE) Question
Hi, using the manual button, step to channel 1 and enter your freq. including the point then press the E button. You might have to step to the next channel using the manual button again. Enter the next freq. and repeat. WX is the weather bands. Lockout is for locking out a nuisance channel(as an example, if someone's mic stays keyed, and keeps the squelch open).Priority is for any channel whose conversations you don't want to miss, just press the button for the specific channel. That way any time someone keys up on your priority channel, even if it's on another channel talking, will go right to the priority one. Review gives you a readout of the freq you programmed into a specific channel. If you need new or extra freq's check here on this site.
http://www.radioreference.com/apps/db/
** Hope this helps you out, let us know,,, Mechanic
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Feb 03, 2008 • Radio Communications
0helpful
2answers

Switching radio bands
what radio do you have? does it even have sideband channels? some radios don't come with them, of fm or upper or lower side bands and short wave
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Dec 08, 2007 • Connex 3300 240-Channels Base CB Radio
0helpful
1answer

Cobra 148 gtl new model
Hello bluzfan, Do you remember the old 40 channel CBs? they used basic A3A transmission (dual sideband single carrier)remember how you got crosstalk sometimes, if your power was too high? Then they went to 80 channel CBs (using a single side band as Lower Side Band (lsb) and the other as the upper side band (usb))? more crosstalk but they invented anl (automatic noise limiter)circuitry to compensate. Now you have the 120 channel CB which uses a form of side band multiplexing (20QAM) to generate 3 times more channel density 40 X 3 = 120. Here is my problem; Cobra should not have done this because you will have massive crosstalk and unaudible sounds because of the increase in channels but not an increase in initial (physical)bandwidth. I hate to tell you this but the only cure for the is to use it in 40 channel or 80 channel mode forget the 120 channel mode, or get a radio with better channel separation.
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Oct 07, 2007 • Cobra 148 GTL 120-Channels Base CB Radio
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