Question about Cobra 148 GTL 120-Channels Base CB Radio

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Sideband power is very low & when you turn up the dynamike from the min position it gets distorted. AM is ok. This is the china made model from 2 years ago. What is the problem & how do I fix it.?

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There is a chip in the modulation circuit......it can be id'd by the # on the board as " IC3 "...It is called the balanced mod chip.

\Have fun...........

Posted on Oct 04, 2010

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What is dynamike gain cotrol on a cobra cb radio


Dynamike Gain Control varies the microphone sensitivity. When set fully clockwise, it is very sensitive - and will be able to "hear" background noises easily. This position also can cause your voice to be distorted or garbled when approaching maximum under the right conditions as well as causing "bleed over" to adjacent channels. When set to minimum, you will need to speak clearly and directly into the microphone to be heard. Most people find a setting somewhere in the middle works best.

You should adjust the level to suit those that are listening to you by asking them if it sounds OK. This prevents them from having to turn their volume down whenever you speak. In a "one-to-one" conversation it is not as noticeable. The trouble comes when 3 or more are conversing. The third person's audio may be low or normal - and the listeners set their radio's volume so that they can hear that person easily. Then you transmit with booming mic audio and everyone scrambles to turn down the volume to save their ears / speakers. This can be very frustrating for the others having to constantly adjust the radio volume whenever you speak.

I hope this helps and good luck. Please rate my reply - thanks.

May 18, 2011 | Cobra GPS

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I have a pair of kicker cvr 124 with a kole 1500 watt amp that is bridged to the woofers. the amp is 385 rms at 2 ohms where should the gain be to get the most power without distortion.


When setting your gain you want to set the gain high usually between 75% to 95%. if the gain is low than turning up the volume on your radio will only amplify the distortion coming from the under powered head unit. By turning up the gain you are maximizing the signal that is amplified coming from your head unit

Mar 20, 2011 | Kicker Car Audio & Video

1 Answer

People say its loud but distorted cant understand me


turn down the mic gain until its not distorted any more.

Also, If this radio has been peaked and tuned, some one may have clipped d10 with is the modulation limiting diode. When you clip it, it disables it. This may have been done instead of just turning VR4 all the way down, which turns the modulation up, but still limits it by a hair. A lot of the time clipping d10 is fine and doesn't get you sputtering, but if it does you need to connect it and just turn VR4 all the way down.

Most likely you have they dynamike to high. About 1 or 2 o'clock should do it.

Also if you are using a power mic, that is too high.

A lot of times it's the mic its self and not the Gain that makes you loud.

If you want to be loud, get your self a skythumper noise canceling mic. And put your mic gain around 1 or 2 o'clock.

Oct 22, 2010 | Cobra 29 LTD CB Radio

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Sound output is heavily distorted.


Check following things:

1. The master volume control on the SR16 is at least half way up. Turn down the amp as needed. Running very low output of the SR16 and high amp gain is sure to get distortion.

2. Check power adapter is the original and is producing correct voltage.

3. Check that audio cable is high quality instrument cable and not consumer or speaker cable.

May 05, 2010 | Alesis Sr 16 Stereo Drum Machine

1 Answer

How many total watts does this system have


Well... It consumes 240 watts of electrical power total so take the audio power specifications with a huge grain of salt, as no audio device puts out in audio power anywhere near what it consumes in electrical power. Heat produced is power consumed, too and nothing is 100% efficient.

In the specs below the only information useful for comparison is in the line I highlighted with >>> <<<<'s as it conforms the closest to the industry standard practice of using:

"X watts into 8 ohms (standard load) from 20 - 20000 hz plus or minus Y db at no more than .0Z% distortion"

The better amps specify vanishingly low distortion specs (0.0x% vs 0.x%) at the cost of being able to claim higher wattage. But they guarantee cleaner sound at the claimed levels.

JVC is being tricky with their choice of a 40 hz lower limit. THAT is the power hungry end of the spectrum. 20 hz is normally the lower limit stated.

"Output Power .............At Stereo operation
Front channels .............55 watts per channel, min. RMS, driven into 4 ohms at 1 kHz, with no more than 0.9 % total harmonic distortion. (IEC268-3/DIN) 30 watts per channel, min. RMS, driven into 8 ohms at 1 kHz, with no more than 0.9 % total harmonic distortion. (IEC268-3/DIN)

>>>>> 30 watts per channel, min. RMS, driven into 8 ohms, 40 Hz to 20 kHz, with no more than 0.8 % total harmonic distortion. <<<<<

At Surround operation
Front channels .............50 watts per channel, min. RMS, driven into 8 ohms at 1 kHz, with no more than 0.8 % total harmonic distortion.

Center channel .............50 watts, min. RMS, driven into 8 ohms at 1 kHz, with no more than 0.8 % total harmonic distortion.

Rear channel .................50 watts, min. RMS, driven into 8 ohms at 1kHz, with no more than 0.8 % total harmonic distortion."

Mar 02, 2010 | JVC RX-554V Receiver

2 Answers

When ikey the mike on sideband lights go on off like your turning it on and off like it sucks all the power runnig it inside house with three amp converter brand new got it today


3 Amps is probably not enough for this radio. To test this diagnosis, conenct a car battery inline with your charger or just the battery to the radio. BE SURE TO HAVE A FUSE ON THE POSITIVE power wire and observe polarity ( + and - ) . If the radio works like it should, you now know the power supply is not big enough. Try a 10-15 amp supply. The manual shows the radio to have a 4 watt ouput on Am and 12 watts on SSB. My experience with Galaxy radios says go with at least 10 amp supply. Here is your manual and a service info page.
http://www.cbtricks.com/radios/galaxy/dx959/graphics/om_dx959.pdf

http://www.cbtricks.com/radios/galaxy/dx959/index.htm

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I have a pioneer gm-x 304 amp. I want to know what are the lpf-off-hpf switches for< and what sdhould I set the input levels to?


Hello packs6,

The lpf-off-hpf switches control the "low pass" and "high pass" filters. When driving full-range or component speakers the filters are usually operated in the "off" position to send all frequencies to the speakers. When driving a subwoofer, the best position is "lpf". If you have a separate amp to power a subwoofer, this amp can be used just for the high frequencies by putting the switches in "hpf".

Input levels should be adjusted to match your receiver output. You don't want the levels so high that distortion results. But you want it high enough for the amp to be able to produce maximum output. Start at about midrange and adjust the receiver volume to a little higher than a comfortable listening level. Adjust the amp gain (level) counterclockwise until you begin to hear the speakers distort. The turn the control slightly clockwise until the distortion disappears. That's the best setting.

Hope this helps.

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Hello e_cody_e,

The settings you have will not break anything and may sound OK.

But they may not be optimum for getting the best bass from your system. The SubSonic setting filters out frequencies below the threshold of hearing allowing the amp to put more power into the frequencies that can be heard. So, it should be set to about the same frequency that your enclosure is tuned for or just a little lower. If your enclosure is tuned for 35Hz, then the subsonic should be close to maximum.

Similarily, the low pass sends all frequencies below the setting to the subs, (other than those blocked by the subsonic filter) and is commonly referred to as the "crossover" frequency. Typical crossover frequencies for subwoofers are 60Hz, 80Hz and 100Hz. For a ported enclosure, lower is probably better.

The phase shift should be set to the position that best synchronizes the bass with the music. Because of the additional wiring required for the subs, the signal to them is sometimes slightly delayed causing the bass to be "out-of-sync" with the rest of the music. The thump of the bass comes just a little sooner or later than expected. If the bass sounds out of phase, turn the phase shift on, otherwise leave it off.

The "gain" or level control allows you to match the amps input to your head units subwoofer output. The best setting is usually as high as possible without distortion. Set it by turning up the head unit volume to about 3/4 maximum and then advance the amp gain until your subs just begin to distort. Then back it off slightly.

These settings should allow your amp to put the most power into the frequencies that your subwoofers are designed for and hence produce the loudest and lowest bass.

Hope this helps.

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