SOURCE: tunring up a cobra 150 gtl/dx
Um... What?? This is hooked to a switch? CB radio by FCC regulations is only supposed to have a max of 4 watts total output. If you can flip it to 7 watts dead key, you are doing really good. It won't do much more then that. It sounds like its set up to run on a linear amplifier, which cannot have more then 3 watts dead key transmitting into it.
Dead key, and modulation are different. You may have a meter that only reads dead key, and won't see the modulation. This radio is probably swinging close to 15-20 watts. you need a meter that can read PEP, Peak envelope power. Cheap meters only read AVG, or average power, witch will only show your dead key.
7 watts dead key is really good for that radio.especially since stock only has 4 watts. you cannot get any higher then that without changing finals.
at 3 watt dead key, or 7 watt dead key, your modulation wattage is still swinging much higher.
Also, you will get more swing with a lower dead key any way, which is better if you want it to be loud.
Leave it alone. its probably set just right.
SOURCE: Reset on the back of cobra gtl 2000 cb radio
the reset button is used to reset the cpu when doing mods.try replacing with momentary press switch.
good luck
ken
SOURCE: schematic diagram of cobra 148 gtl cb radio china made
SOURCE: cobra 148 gtlcobra 148 gtl DX
http://www.cbtricks.com/radios/cobra/148gtl_dx/index.htm
Nice choice of radio i have the Grant LX Uniden which is roughly the older version.
This site may be of interest also if you choose the channel mod make sure you have the right PLL. http://www.radioaficion.com/HamNews/mods/mods-cb/2428-uniden-grant-xl-mods-pll-agc-power-clarifier.html
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