Cannot select USB or SSB.Displays LSB or LISB? Very poor reception

could be a number of problems,final being one of them.Could be a bad match to your antenna . could be a bad transformer or a rectifier . If you have no electronic knowledge take it to a tech a let them work on it. Could save you some money .

something to do with the SSB filtering maybe, sorry i cant be too helpful!

find the wires going to the switch then follow them to make sure they are connected. If they are ,gently,with your fingers,turn the dial to either USB or LSB .then adjust your clarifier to receive a signal.

• 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

OK bare with me now i have no idea of your knowledge level with CB/ SSB radios.
Lets make sure our setting on radio face is correct before we decide this is an mechanical problem.
Set the following

• Volume knob 12 o'clock
• Dynamike knob 12 o'clock
• Squelch full counter clockwise
• Rf gain full clockwise
• Select S/RF position on the SWR/CAL switch
• Select AM position on the USB/AM/LSB switch
• Select CB on the CB/PA switch

Now there will be some critics with opinions on the next instructions. Place a small screwdriver or test lead from a multimeter in center conductor of antenna jack listen for onair noise or radios operators to verify RX is working. Now remove the antenna/screwdrive/testlead. Then key mic just long enough to notice if the meter is swinging do not hold the mic button long this can damage the final. I tell you to do it this way rather that connected to your antenna system so we can eliminate the question if it is you antenna sytem or the radio.
If the LSB or USB was selected when you keyed the mic you would see no meter movement this is due to the lack of a deadkey or carrier for SSB which is a much more efficient method of transmitting on AM.
There are few things that affected the rx and tx together.

adjust L20 (AM) L21 (USB) L22(LSB)

Check to make sure that the radio is on AM not FM or LSB or USB. There is Also a power control on the front of the radio turn it up half way and see if this might be your problem.If it still does not have any power out put,put the radio on usb or lsb make sure that your modulation is turned up and talk into the mike to see if you have any output.If you do have output on ssb mode the am regulator is most likely bad. ( Q 51 & Q 53) wich is located in the right hand side of the radio.

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.

You'll need to connect Frequency Counter to C252 & adjust:

USB Frequency: 10.6975Mhz adjust L126 in receive mode
LSB Frequency: 10.6925Mhz adjust L127 in receive mode