Question about Cobra 148 GTL 120-Channels Base CB Radio

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No rx on am with the anl switch on

When i turn the noise reduction switch on it would kill am rx, works ok on lsb and usb.

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  • 27 Answers

The NRL switch has broken a contact or is simply not making contact...check the wireing going to the switch at the switch and
and the board end. These switches often play up and are freely available from electronic parts store

Worth a try flyingfox@people.net.au

Posted on Jun 22, 2008

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2 Answers

CB Plays out PA Speaker


Are you following the user manual that came with the radio?
NB-ANL/CB/PA SWITCH: When the switch is in the NB/ANL position, the Noise Blanker (NB) and Automatic Noise Limiter (ANL) circuits are activated.
The Noise Blanker is very effective in eliminating repetitive impulse noise such as ignition interference. In the CB position, the PA function is disabled and the radio will transmit and receive on the speaker that is connected. In the PA position,
the radio acts as public address amplifier. Your voice will come out of the speaker that is plugged into the PA. SP. jack on the rear panel. The radio does not operate when you are in the PA mode.

When you plug a speaker into the ext. jack does it kill the radios internal speaker? It should until you unplug it; if not and you are following the about you may have a wiring issue with the jacks.

May 04, 2014 | Radio Communications

1 Answer

What is a voic box on a cobra 29 ltd? What is a good antt combo four a 29 ltd?


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

Jan 23, 2013 | Lands Phones

1 Answer

NO AUDIO / NO TX


OK bare with me now i have no idea of your knowledge level with CB/ SSB radios.
Lets make sure our setting on radio face is correct before we decide this is an mechanical problem.
Set the following
  • Volume knob 12 o'clock
  • Dynamike knob 12 o'clock
  • Squelch full counter clockwise
  • Rf gain full clockwise
  • Select S/RF position on the SWR/CAL switch
  • Select AM position on the USB/AM/LSB switch
  • Select CB on the CB/PA switch
Now there will be some critics with opinions on the next instructions. Place a small screwdriver or test lead from a multimeter in center conductor of antenna jack listen for onair noise or radios operators to verify RX is working. Now remove the antenna/screwdrive/testlead. Then key mic just long enough to notice if the meter is swinging do not hold the mic button long this can damage the final. I tell you to do it this way rather that connected to your antenna system so we can eliminate the question if it is you antenna sytem or the radio.
If the LSB or USB was selected when you keyed the mic you would see no meter movement this is due to the lack of a deadkey or carrier for SSB which is a much more efficient method of transmitting on AM.
There are few things that affected the rx and tx together.

Aug 16, 2011 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

I need to know what knobs turn which way and what buttons need to be on


Volume/Squelch control: As desired
ETone: Sets the sound of the echo as desired
MicGain/RF Gain control: Normally, leave fully clockwise
Band Switch: for CB, turn all way to left (a/e)
Mode Switch: Selects how you modulate the radio. Normally, you will operate on AM, USB or LSB.
Fine/Coarse control: Changes the frequency you operate on. Normally, set so the frequency counter reading ends in 5. (center slot of the channel).
Buttons:
RB: Roger beep. Turn on or off as desired.
NB/ANL: Noise limiters. Leave on.
Frequency Counter: Turns counter lights on and off.
+10 KHZ: Allows you to get the channels missed by the Channel knob. Normally, leave off.
Power: Selects either high or low transmitter power setting.
Band: Selects band of operation. Low (A-D) or High (E-F)

Jun 12, 2011 | Galaxy Radios DX- 88HL Base CB Radio

1 Answer

What exactly does the anl nb/anl button do on my cobra 29 wx nw st


ANL stands for "Automatic Noise Limiter" and NB stands for "Noise Blanker".

The ANL gets rid of a lot of interference noise caused by mechanical noise from motors and other electronic components in a car.

It also gets rid of noise from other sources of interference.

The NB is for extreme cases of noise, but can slightly lessen your receive sensitivity.


Basically both functions help decrease interference noise.

Nov 24, 2010 | Cobra 29 WX NW ST 40-Channels Base CB...

2 Answers

I have a cobra cb and it makes a weird sound all the time, when i accelerate the sound gets biger


What you are getting is ignition noise from the engine of your car. Could be spark plug noise or alternator whine. If your radio has a ANL or NB switch, turn it on. If that does not fix it, you may have to get a filter for your powerline or change where you are getting power for the radio. Hope this helps, with the limited info available. Let me know,,,Mechanic

Oct 09, 2008 | Cobra 25 LTD 40-Channels Base CB Radio

1 Answer

Cobra 148 gtl new model


Hello bluzfan, Do you remember the old 40 channel CBs? they used basic A3A transmission (dual sideband single carrier)remember how you got crosstalk sometimes, if your power was too high? Then they went to 80 channel CBs (using a single side band as Lower Side Band (lsb) and the other as the upper side band (usb))? more crosstalk but they invented anl (automatic noise limiter)circuitry to compensate. Now you have the 120 channel CB which uses a form of side band multiplexing (20QAM) to generate 3 times more channel density 40 X 3 = 120. Here is my problem; Cobra should not have done this because you will have massive crosstalk and unaudible sounds because of the increase in channels but not an increase in initial (physical)bandwidth. I hate to tell you this but the only cure for the is to use it in 40 channel or 80 channel mode forget the 120 channel mode, or get a radio with better channel separation.

Oct 07, 2007 | Cobra 148 GTL 120-Channels Base CB Radio

4 Answers

Cb radio


i have a president hr2510 when you finish keying the mic.say am,usb,lsb the receive takes a 2 seconds to come back on any ideas out there....

Aug 08, 2007 | Cobra 148 GTL 120-Channels Base CB Radio

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