Jonsue
Member
It is the first time I have posted ever so here it goes.
I picked up a used Cobra 2000.... Or very abused Cobra 2000
It had been modified extra channels etc via a screwdriver junky.. Poorly soldered wiring so i recapped pulled out the bad wires to get it back to semi stock put in the veractor diodes that were pulled soldered in the missing diodes and resistors that were cut.
No sound... replaced the audio amplifier still no sound which traced the RF back to the initial AF transistor and found a shorted diode.... many hours and hours later tracing and checking.
It began to come back to life.... Am, SSB good modulation 4-7 watt AM 12-18 watt ssb. Sound was back and loud
The frequency on transmit and receive were off by 1khz so I tuned the pots as close as I could get to each other.
on 22 Am it is 27.250 on transmit and receive on 22 is 27.261 I cannot seem to get any closer as it just moves the receive on tune or the transmit on tune.
VR5 kicks it up 1khz so it is tuned down as far as it will go.
I am using an HP frequency counter external and the internal counter/clock is the same off by .011 to .013 ish.....
any help would be appreciated.
I picked up a used Cobra 2000.... Or very abused Cobra 2000
It had been modified extra channels etc via a screwdriver junky.. Poorly soldered wiring so i recapped pulled out the bad wires to get it back to semi stock put in the veractor diodes that were pulled soldered in the missing diodes and resistors that were cut.
No sound... replaced the audio amplifier still no sound which traced the RF back to the initial AF transistor and found a shorted diode.... many hours and hours later tracing and checking.
It began to come back to life.... Am, SSB good modulation 4-7 watt AM 12-18 watt ssb. Sound was back and loud
The frequency on transmit and receive were off by 1khz so I tuned the pots as close as I could get to each other.
on 22 Am it is 27.250 on transmit and receive on 22 is 27.261 I cannot seem to get any closer as it just moves the receive on tune or the transmit on tune.
VR5 kicks it up 1khz so it is tuned down as far as it will go.
I am using an HP frequency counter external and the internal counter/clock is the same off by .011 to .013 ish.....
any help would be appreciated.