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Here's a handy, printable frequency chart for this radio. Band "E" contains the Citizen's Band Frequencies. "Band E" in "AM mode" is the only legal settings to transmit this radio in the USA.
Important: Several other "settings" may also give the FCC to inquire about your operation if caught. Additionally, this radio is an "Export" model - meaning not intended for sale in the USA. The extra frequencies, FM mode and some other features along with the 8 watt transmit power ability; all contribute to a radio that is not permitted to be sold or used on these frequencies in the USA.
Assuming you're talking about the Galaxy DX88HL, and assuming the mad has been done to reach the 11 meter band, you press the band button in, that put's you to the E-H banks, select the E/A bank which is high bank E. with the frequency counter on, it should read 26.965 for channel 1. If it reads 26.975, then your +10KHz switch is on, turn it off. you'll then be properly set for 26.965 (ch.1) - 27.405 (ch.40). You also have 5 "hidden" frequencies, these are at ch. 3, 7, 11, 15 and 19. To get to the "hidden" frequencies, go to any of the channels listed and turn on your 10KHz switch. Those frequencies are not attainable on radios that do not have a +10KHz switch or a clarifier capable of sliding that far over. To do repairs and for a full list of schematics, diagrams and so forth, I suggest this site, it has the most coverage of the Galaxy DX88HL as well as other galaxies that I've been able to find. http://www.cbtricks.com/radios/galaxy/dx88hl/index.htm .
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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