Galaxy dx73v cb

Here is a link to a channel chart and band switch setting.
Galaxy Radios DX73V Service Manual

what kind of radio is it? If its a cheapo you might as well buy another one because it could cost as much to fix it as it would to buy a new one.

Band should be E Band high/low button on high 10 khz off AM selected
To check that you have done this correctly frequency counter will read 27.185 plus or minus 5 khz. This is of course proved you have a radio that is converted for 11 meter cb frequencies.

http://www.cbtricks.com/radios/galaxy/dx88hl/index.htm Frequency Conversion is the channel expansion mod/conversion

Volume/Squelch control: As desired
ETone: Sets the sound of the echo as desired
MicGain/RF Gain control: Normally, leave fully clockwise
Band Switch: for CB, turn all way to left (a/e)
Mode Switch: Selects how you modulate the radio. Normally, you will operate on AM, USB or LSB.
Fine/Coarse control: Changes the frequency you operate on. Normally, set so the frequency counter reading ends in 5. (center slot of the channel).
Buttons:
RB: Roger beep. Turn on or off as desired.
NB/ANL: Noise limiters. Leave on.
Frequency Counter: Turns counter lights on and off.
+10 KHZ: Allows you to get the channels missed by the Channel knob. Normally, leave off.
Power: Selects either high or low transmitter power setting.
Band: Selects band of operation. Low (A-D) or High (E-F)

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 .

on the cb band (11 meters ) 27.105 is channel 12

It's oscillating of frequency. At this point I recommend you take it to a licensed tech and have them put it on a scope. This is not a easy at home fix.

Okay.

You do set this up like a regular CB. The meters refers to how long the waves are. CB is 11 meters. So its very close. The antenna woud be tuneds slightly shorter. Use the SWR meter in the radio to calibrate just like you would a normal cb.

Now for the ABCDEF knob. each letter is 40 channels in the band. So A would be 1 - 40 channels, then B would be the next 1 - 40 channel frequencies. You use the frequency counter in the radio(providing that model has one) to tell what channel you are on.

Here is some info one the frequencies in the band.

Now for AM and FM. this is the type of modulation you are using for transmit and receive.

CB transmits on AM or SSB. Amplitude modulation or Single side band. Most CB radios only have AM. But some also have SSB. None will have FM.

FM is frequency modulation.

10 meter radios can have AM FM SSB and DSB depending on the model and options it comes with.

So your radio has 6 ranges for freqency. each is 40 or 50 channesl. Not sure what model you have. If it has 40 then you have 240 channel freqencies.

with AM and FM, you double that, because you can talk on AM or FM on all the channels. If you are on AM and some one transmits on FM unless they are really close, you will not hear them at all, but if you do with will just be garbbled noise.

Also Am and FM both work a little different with range etc.

Now, you may be able to talk on the CB channels as well. Cb starts at 26.965 MHz and ends at 27.405 MHz. The channels are all .010 MHz appart.

Hope this helps

To add 10Khz to your transmit frequency:

FIXED/OFF/+10KHz SWITCH: The left position puts the radio on
one of the three fixed channels that is selected by the channel switch
(6,19, or 21). This over-rides the channel selected by the 40 channel
knob. The right position adds 10KHz to whatever frequency you are ON.
In the middle, both features are OFF.

Otherwise, a radio tech would be able to retune the frequency inside the radio.

After adding 10KHz to your frequency, use the SWR control to check the SWR of your antenna.
Here's how:
SWR CAL CONTROL: Normally this switch is set to “PO”. Then,
during transmission, the meter indicates output power. To read SWR,
rotate this knob during transmission until the needle moves to the “SET”
point on the SWR scale. Then, while still transmitting, set the R.B./SWR
switch to SWR.

Ideal SWR is 1 but you'll want to be as near one as possible. An SWR of 1.6 or greater will make ineffective use of your antenna.
If in doubt, a radio tech has the required meters and tools to adjust the SWR/Tuning of your antenna.

as far as the transmit frequency changing while you have the mic keyed this is normal, the transmit frequency is a little different than the receive, as far as the lost channels go you need to check the galaxy website and check to see if thier is any fixes listed. if none is listed then you can send the tech's a e-mail and tell them your problem and they will advise you on what to do.