The Cobra 1000GTL was an AM-only CB base that looks a lot like the 2000GTL. Has a clock, but no counter and no SSB. It was discontinued after a year or three unlike the 2000GTL model. The block diagram looks a lot like a Cobra 29GTL/LTD, but the circuit board layout is different. Users who like this model seem to like it a lot. This customer likes his enough to hire me to re-cap it and take care of other old-age issues. One of these was the carrier control someone had installed long ago. This shows the setup after I unhooked it. The 2-inch diameter knob stuck to the rear panel is just barely visible. Used the wrong transistor. A Darlington power transistor just works better. And it's a miracle that the sloppy whacko wiring method didn't blow something up.
Where a Cobra 29LTD has a convenient wire jumper that gets removed to insert a carrier-control transistor, this radio has a resistor R49 instead. It gets removed. And the circuit-board number is Pee-Cee four zero seven, not four-cee-seven.
The Peel'N Stick goes in its place, the positive lead to the front of the radio, the negative lead to the rear.
Naturally you should swab the mounting surface with alcohol to make sure the adhesive gets a strong bond to the heat sink surface.
The backing paper comes off the adhesive foam, and the module gets plastered to the heat sink surface.
Now for the ground wire. There's an extra hole in the ground foil at the inboard-rear corner of the pcb. Clear the solder from it.
Here's where it's found on the component side. The black ground wire goes here.
Next the factory SWR Cal control gets removed from the front panel.
The new control that's attached to the peel'N stick goes in its place.
The chassis has a convenient square hole at the front corner of the circuit board that will fit the SWR Cal control's bushing just fine.
This way you can set the SWR Cal control to its mark with the carrier set around 3 Watts. Should give you some up-and-down leeway to set the Cal mark by setting the carrier power later on. Better than disabling the SWR meter altogether.
The radio's internal SWR meter is no great shakes to start with, but I just don't like to disable a feature when it can be saved with this little effort.
Only remaining task is to set the minimum carrier where you want it using the tiny trimpot on the P'NS board.
Probably takes longer to read this than to install the thing.
73
Where a Cobra 29LTD has a convenient wire jumper that gets removed to insert a carrier-control transistor, this radio has a resistor R49 instead. It gets removed. And the circuit-board number is Pee-Cee four zero seven, not four-cee-seven.
The Peel'N Stick goes in its place, the positive lead to the front of the radio, the negative lead to the rear.
Naturally you should swab the mounting surface with alcohol to make sure the adhesive gets a strong bond to the heat sink surface.
The backing paper comes off the adhesive foam, and the module gets plastered to the heat sink surface.
Now for the ground wire. There's an extra hole in the ground foil at the inboard-rear corner of the pcb. Clear the solder from it.
Here's where it's found on the component side. The black ground wire goes here.
Next the factory SWR Cal control gets removed from the front panel.
The new control that's attached to the peel'N stick goes in its place.
The chassis has a convenient square hole at the front corner of the circuit board that will fit the SWR Cal control's bushing just fine.
This way you can set the SWR Cal control to its mark with the carrier set around 3 Watts. Should give you some up-and-down leeway to set the Cal mark by setting the carrier power later on. Better than disabling the SWR meter altogether.
The radio's internal SWR meter is no great shakes to start with, but I just don't like to disable a feature when it can be saved with this little effort.
Only remaining task is to set the minimum carrier where you want it using the tiny trimpot on the P'NS board.
Probably takes longer to read this than to install the thing.
73
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