In the old cobra ltd`s they used TA7222AP with pins 7 n 8 soldered together, I have a new version of this radio and has a output with YD1022 stamped on it, with pins 9 n 10 soldered together, pins 7 n 8 soldered together , pins 5 n 6 soldered together, ? is this output YD1022, the same as a TA7222AP,
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Sounds like its not wired up right, the audio wire must be off,take the plug apart and check the white wire, re-solder it. here is the wiring, pin1-shield,pin-2audio-(white), pin3-transmit-(red), pin4-receive-(black).....hope this was helpful...
Are you talking about this radio or what others are hearing from your radio?
My friend, no one but the holder of a 1st class FCC radio license is permitted to adjust the input power to the final amp. Further, one needs some pretty technical equipment to accomplish this fine tune adjustment. Failure to properly set this envelope will result in degraded operation and possible failure of your radio.
If you can't live with the present circumstance, get your radio profesionally repaired.
did you change IC4=TA7222AP ?
check input ic4 pin1 is it supply voltage?=12vdc.
check C48 couple cap,also check C39 replace
with a 25 watt and C42 also C45.
check R130 1.1 ohm. also R121 180 ohm.
if pin 1 on ic4 is low volt or missing,check TR23
maybe this will help some
Just because the chip is warm doesn't mean it's bad, especially if it seems to work fine otherwise. Do however make sure that the device is properly heatsinked, and inspect the work done in the process of any modifications. If for some reason the device is self-oscillating it could do so at a frequency above hearing thereby going unnoticed. That will cause the device to overheat, and also make modulation weak and the RF to splatter out of band. You'll have lots of power on the RF wattmeter, but people can barely hear you if that's the case.
It sounds like it may have been hooked up backwards when hooked up to the battery charger. If so it probably blew the polarity diode (D23) (1N4004) and with no sound it probably blew the audio IC (TA7222AP) mounted to the case of the radio. Also look at all of the large capacitors and make sure that the tops are not swollen or busted open if so they need replaced also.
Initially, pls confirm that there is modulation (transmit audio). The reason I asked is if IC4 (TA7222P) is blown, then the radio would have no audio amplifier which would explain no receive audio. Additionally, the final and pre-final (TR15 & 15) gets is modulated TX+12 through D8 from T1 which in turn is the output of IC4 through C48.