I have a Cobra 29 LTD with Bluetooth. I have no static no matter where I set my squelch and RF gain unless my noise blocker is off. Both my rx/tx and antenna lights turn red when mic is keyed. I have try many diferent styles of antennas(window mounted ,magnetect ,and regular)

is mic plugged into radio? put oin another 4 pin cobra mic and see if it still happens.make sure your squelch is wide open and rf gain is also.If you still have the problem it could be several things. Final , main IC, or audio chip.

vr1 "s" 9 setting on the tx meter vr2 voltage setting vr3 squelch vr4 amc vr5 p4 display on tx signal meter.

Cobra's LTD 29 model Citizen's Band radio features the full 40 channels allowed and a heavy-duty microphone. The radio provides 4 watts of AM radio frequency output with a switchable automatic noise limiter and noise blanker. Other features include Cobra's Delta-Tune function. Making a Cobra LTD 29 hear and receive better involves making changes to the radio's settings, including the settings specific to this brand.
M/F Turn the switch labeled "NB/ANL, ANL, OFF" to the "ANL" position and try the transmission again if noise is affecting reception. "ANL" is an automatic noise limiter function and reduces noise caused by the vehicle's electrical systems and electronics.

M/F Switch to "NB/ANL" to activate the noise blanker, which may also reduce noise if you continue to have problems. It's an RF noise filtration function and will help with ignition noise.

M/F Adjust the "RF Gain" knob by turning it clockwise to increase gain in weak signal areas if you have problems hearing radio traffic.

M/F Set the "Delta-Tune" function to capture a more listenable signal and get rid of adjacent channel noise. Rotate the knob labeled "Deltatune" to the center position for best tuning. Try micro-adjustments to the left or right as well.

M/F Turn the volume up if you still can't hear and as with any CB radio, adjust the squelch if the radio is noisy when there's no traffic. Turn the knob labeled "Squelch" all the way to the left to receive all signals, including noise and turn the control clockwise until the background noise stops. You will be able to hear the strongest transmissions without having to listen to weak signals and noise.
The service manual can be found here

Make sure the squelch is turned all the way to the left, the RF GAIN is turned all the way to the right. The cobra 29 has a very good noise blanker, Turn the ANL/NB switch to off, You will probably hear a Lot of static, As long as you have a good ground on the radio and antenna, and your SWR is 1.5 or lower, you need not worry about static.

I just saw your message and the problems you have been having, from your description you have managed to get everything sorted out and working. I to have been into cb's for many years and enjoy the challenge tinkering with the system and I congradulate you on a job well done.

look at a schematic of a 29ltd to do that.. the 25 does'nt have it in there easily.. the 29 can be fixed to change tx/rx freq. with the delta tune

First try getting a good antenna. I don't know what you have BUT STAY AWAY FROM "RUBBER DUCKY" ANTENNA'S!!!
Check your SWR's!
Make sure the RF Gain is maxed
Make sure the SQUELCH is all the way to the left
"WILDCAT" IN LAURELVILLE OHIO
35 YEARS OF CB FUN!!!

I have the same radio as well. If you are running a "stock factory mic".....do this:
VOLUME: set to your comfort
SQUELCH:all the way to the left (if you don't mind hearing everything other wise adjust to the right to illiminate noise)
DYNAMIKE:If you have a factory mic or "noise canceling mic", turn all the way to the right (unless it squeals and then turn the mic gain down slowly until the squealing stops)
RF GAIN:that is your "receive" and I always turn it all the way to the right to maximize reception! In my opinion, this is the dumbest knob ever made since why not hear as good as you can??? thats what the SQUELCH is for!
DELTA TUNE: IT IS "USELESS!!!
SWR CALIBRATE: don't ever trust it! ALWAYS USE A GOOD SWR METER "IN LINE"
Now as for the "SWITCHES"
The top left switch is the SWR and as I stated, do NOT trust it and leave it on "S/RF (TOP)
SWITCH TWO: If you have it on OFF, you may get allot of engine spark plug firing noise so I run mine in the "middle" (ANL)
THIRD SWITCH: CB
FOURTH SWITCH: Brightness is to your liking!
There ya go! You can always set the switches to your liking and comfort.
"WILDCAT" IN LAURELVILLE OHIO

Make sure the the RF gain is up all the way. If it is then the collector diodes are probably blown.

RF gain should be set to max.

turn on the ANL. You may be picking up noise from the car. the cobra 29 is known for its great receive.