SOURCE: magnum 257 it will not transmit on lsb or usb it will on am and f
With SSB you have to put audio on the carrier you cant just key the microphone and expect it to output a signal unless you talk into the microphone at the same time this is how SSB works.
So if you talk and the meter starts to move then its ok, if you talk or whistle and nothing moves then the circuit on the SSB side of the unit is faulty.
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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