President mckinly ssb/am model with mb8719 pll chip.
Fault finding need help..transmitt carier on am normal 4 watts no modulation on am and no modulation on ssb usb/lsb.receive is alright.checked mic insert -inside mic etc and other end mic plug all ok their.
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Re: president mckinly ssb/am model with mb8719 pll chip.
It looks like you had some loose connections in that CB. you may want to also check for other cold solder joints throughout the units and touch them up with some solder. Might I suggest you use a desoldering tool and then just add new solder to the connection.
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0 = Transmitter Timeout timer has timed-out 1 = Transmit Frequency is lower than TX Lockout Lower Limit 2 = Transmit Frequency is greater than TX Lockout Higher Limit 3 = Phase-locked-loop (PLL) won't lock at this transmit frequency 4 = PLL is intermittently coming out of lock during transmit *If your radio displays error 3 or 4, don't keep trying to transmit on
this frequency. The cause of the problem could be low power supply voltage to the radio or
the radio's VCO loop needs adjustment. Refer to a qualified technician
for service. Contact the installer of the chip first. If, however, you installed the chip
yourself, contact a qualified technician
What radio?? Does it have single side band(SSB)? If not, then don't use SSB.
AM - amplitude modulation SSB - single side band.
If you have SSB, there would be a switch on it to transmit in SSB. If not, it is AM only.
Second, Has this radio been worked on to be able to run on an amp? If not, you will blow the amp.
A CB radio transmits dead keys with 4 watts of power, and transmits with 4 watts of audio.
a 4 watt dead key is too much for a linear amp. You will smoke the transistors. Also, 4 watts of audio is not enough to drive it properly. You won't get full power.
The dead key needs to be around 2 to 2 -1/2 watts,or what ever makes the linear dead key half its peak wattage., and the modulation (audio) turned up all the way.
It doesn't sound like you know too much about CB radio's. Not a big deal, you can learn. For right now you may want to take it to a cb shop and tell them you want a peak and tune, and set up to run a linear.
You can find CB shops usually at truck stops. Some area's they are other places. Check the internet for local shops.
In the back is where power mods have been added...It sounds like a swing kit 1/2 watt deadkey to 25 watts which is a powerful modulation exceeding 100%. Its a 220uf capacitor in place of a jumper J1 or J(x) J something in some radios. if you replace the jumper and remove the capacitor 220uf or 470uf one.(near finals it will return to around 4 watt dead key) The result of 4 watts is modulation is flat;where if you adjust it to 2 1/4 watt to say 20 watts it will be very loud and modulation is at 100%.