I got a cobra 29 ltd with no TX.
No needle swing.
TX light goes red when keyed.
I found a bad driver and replaced it.
I checked ic3 the TX mixer and no RF out at pin 9.
Checking the PLL I see the voltage on pin 15 is only half.
There in no frequency at pin 15 of the PLL.
I compared this measurement to a working 29.
On pin 15 the working cobra 29 the channel frequency is sent form pin 15 of the PLL over to the TX mixer (IC3).
I have checked lots of caps, transistors etc.
Im looking for some help in fault finding the PLL or supporting circuit to make it work.
Thanks for comments and help.
No needle swing.
TX light goes red when keyed.
I found a bad driver and replaced it.
I checked ic3 the TX mixer and no RF out at pin 9.
Checking the PLL I see the voltage on pin 15 is only half.
There in no frequency at pin 15 of the PLL.
I compared this measurement to a working 29.
On pin 15 the working cobra 29 the channel frequency is sent form pin 15 of the PLL over to the TX mixer (IC3).
I have checked lots of caps, transistors etc.
Im looking for some help in fault finding the PLL or supporting circuit to make it work.
Thanks for comments and help.
