20 Most Recent Cobra 148 GTL 120-Channels Base CB Radio - Page 9 Questions & Answers

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RF feedback into the radio most likely from bad SWR or poor ground counterpoise at the antenna. Change out antenna to something more capable of use with this radio. Maybe a 102 stainless steel whip or Wilson 1000 or K40 type.

Take your radio to a CB Shop and have them 'tune it up' or 'peak' it. It is usually a modest fee and will improve the transmit range of the radio. There are usually shops near truck stops, just ask around on channel 19 in the area if there is a shop nearby.

Some radios do better than others, there may not be a great improvement on your particular radio.

cobra 2000
am carrier 4.4 volts will not ajust...ssb carrier will 3.5 volt will ajust but max out put is only 3.5 volts.losses all voltage at ssd carrier when switched to usd r lsb

Don't get crazy into mods. Some are good some are bad.

Really all you want to do is a peak and tune on it. The cobra 148 has great audio already. The most I would do to it is turn up the modulation all the way, and the AM power, then put a swing mod in. That will get you max wattage. 2 watt dead key.

Talkback is only necessary if you are going to be putting an echo board in so you can hear how the echo sounds.

there are 2 finals in this radio. one for side band, and one for AM. So if it works okay on side band, and not at all for AM, then the final for the AM side is bad. Replace it.

call 3174269649 they have them or can order them

check out your crystal...this is what controls your freq. it could be as simple as a bad soilder

you blew the resistor,do not try it again until you get the resistor changed....if you do try it it will take down other parts.

cheaper to buy a new radio sounds like u have blown it or maybe just the safety diode if just the diode just change it but better to have inline fuse

no need colors. look at the switch and plug to verify them. on 4pin cobras/galaxy/connex radios
pin 1 ground
pin 2 audio
pin 3 TX
pin 4 RX cobras

don't worry about wire colors. pin 1 is ground. some mic's need two wires for ground depending on the PTT switch used. pin 2 audio. pin 3 TX pin 4 RX.. thats all there is too it. once you know the pins all radios are easy. galaxy/connex/genlee same pin outs except pin4 isnt' needed for RX but can be used for 9v dc to power micropohnes.

Turn the volume up about 1/3, the squelch off or fully counterclockwise. You should now hear static or talking,if not something is wrong with the radio. As a last resort change to channel 19 and see if it is dead as well. None of this is valid unless you have a proper antenna connection. When you are receiving then adjust the volume to a comfortable level and turn the squelch up, clockwise, until it just mutes when no one is talking. The higher the squelch the stronger the signal has to be to be heard.
Good Luck,
Gilshultz

Hi there!!

If you have an echo board what kind is it? I can give you the connections and where they go it just depends on which echo board you have!! I can also tell you where that talkback goes!! Let me know

Dennis

There are a lot of meters on ebay. That's where I get mine.Usually around $5.

As for the other parts, only thing I can recommend is a google search.

i am not sure what a wood speaker is ,unless you're talking about a home speaker.if you are coming through stereo
speakers take any excess wire on the speaker and coil it up as many small loops as you can and tape or wire tie them.this creates a trap.this works on just about any thing picking up you're signal.

200 - 240 watts swing. I could pobably tell you better if you told me the make of the box.

possably corrosion on the pins of the plug into the radio, unscrew, push in and out a couple of times, and try again, maybe a break in the cable where it flexes the most. or faulty antenna

look at the power knob inside the radio. With the face, facing you, it should be the tab on the left. Depending on what year it is it could be a pinkish wire..

That is the switched 12v off the power knob. Use a digital multimeter to make sure.