I hope you have the right equipment to work on this. http://www.cbtricks.com/radios/galaxy/dx99v/
If it was modded you may be in for a long haul. There are a lot of youtube vids on how to mod radios and not many of them do it correctly. Good luck
SOURCE: Galaxy DX99V
The RK56 was a good mike until Telex bought out Turner many years ago. Now the audio output is lower than it used to be & it's not a compatibility issue as Galaxy radios have microphone amplifier circuits similar to most other CB & 10-Meter radios. You'd have been better off buying an Astatic 636L or even a generic noise-cancelling mike instead. The only thing I can recommend is to hold the mike on your cheek, close to but not directly in front of your mouth, with the grille facing it & speak in a louder than usual voice.
SOURCE: Galaxy dx99v cb radio
did this problem occur while radio was being operated? or when it was being worked on? or a result of being worked on?
SOURCE: rci 2980 no modauliton on am/lsb/usb/fm.but good
is it steady output on AM with no modulation swing. then change the Audio transistor. SSB should work. they feed straight through to rf final. if no modulation on either mode, then check the mic, audio ic preamp.
SOURCE: galaxy 99 v
Likely the radio has a blown detector diode on the board as FM uses a special demodulation detection circuit called a quadrature detector or a discriminator detector the SSB circuit uses a product detector so the only other thing used in detection is the Am detector Diode. That is the first place to look if it is not bad it will be somewhere in that circuit.
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