Question about Cobra 200 GTL DX 4-Channels Base CB Radio

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My cobra 200gtl rev 2 cuts out on ssb after a few minutes

Power stops while transmitting on lsb high power,lights stay on and signals come in but no carrier after a few mins,then resets itself 5 seconds later

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It sounds like the final transistor may be shorted/burned out. If you don't know how to locate or test the transistor you'll have to take it in to a tech. These transistors are usually quite cheap but as to the labour cost it depends on your tech. Usually what causes this damage is a bad antennae match or a bad antennae itself, even a shorted antennae cable. After you've repaired the radio check the antennae and cable first before connecting it up again, then check your match with an SWR meter. Good luck

Posted on Apr 19, 2014

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SOURCE: Cobra 200gtl High Power Transmit problem??

Depending on the type of power supply, radio frequency (RF) energy from the transmitter may be 'fooling" it into thinking that you're overloading it. Check to see if there's any discernible dimming of the meter lamp when this problem occurs, if so, the supply is the culprit.

Otherwise, its probable that the final amplifier transistors are overheating, either they are 'leaky' or not properly attached to the heat sink.

Posted on Sep 26, 2008

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1 Answer

My cobra 142 gtl loses power about two minutes after keying the mic.


hi

it looks like the output stage is going hot (99%)

maby the swr is high end eficiancy is low

usualy on ssb the power is higher than on am


bernard




http://www.rylwy.com/

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1 Answer

Ihave a gargeled recive sound


Check the position of the mode selector switch. You may be receiving a SSB (single side band) transmission that is not on the exact same frequency as you or, your radio is in AM or FM mode. You will need to select either USB or LSB (upper or lower side band) and vary the clarifier knob until the sound becomes intelligible. If the sound does not become clear, try the other side band and repeat varying the clarifier knob.

Conversely, if you are in USB or LSB mode and there is a transmission on AM or FM, it will have the same garbled sound. Try changing the mode to AM and the FM. If it does not become clear, it is likely a SSB transmission and you are not on the exact same frequency of the transmission you are hearing. Vary the clarifier knob until it becomes clear - or change to the other side band if needed and try the clairfier again.

The short story is that you must be in the same mode and on the same exact frequency. When in AM or FM, this is less of a problem as these are much more wide banded signals than SSB signals.

The 2990 is really a 50 watt 10 meter amateur radio - but is geared to CBer's as it is easily modified to work in the CB frequency range and the so called "free band" between USA's CB (11 meters) and worldwide amateur 10 meter bands. Be careful transmitting this radio on CB frequencies as it violates FCC rules for power output there - and transmitting in the 28MHz - 29.7MHz requires a valid amateur radio license. Fifty watts on ham frequencies is tiny compared to the 1500 watts permitted. Why not get your ham license (here's how) and leave the "Chicken Band" (and all it entails) behind. You won't miss it!

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Apr 12, 2012 | Cobra Radio Communications

1 Answer

Cannot select USB or SSB.Displays LSB or LISB? Very poor reception


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You will need to know the exact frequency and the broadcast time, and the side band. Turn the radio on. Select a frequency which you know carries SSB signal and wait. Those that broadcast on SSB are not radio stations, maybe ham radio operators.

You can also select a short wave band, press the SSB button once or twice to select the side band and launch the automatic tuning system. It will scan the meter band and stop for a few second when it receives a strong enough signal. If you are able to perceive a clear signal on LSB or USB then you found a broadcaster. Some radios just have SSB and you cannot choose the side.
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How to adjust frequency on transmit??? Galaxy


hELLO THERE
hERE IS SOME MODIFICATIONS FOR THIS RADIO
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Unmarked VR in R188..AM/FM Medium Power (DX 33HML only)
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1 Answer

Cobra 200GTL: Clarifier affects TX


Unfortunately, most people look to unlock the clarifier in radio's it is locked in.

From what I understand it is possible to lock it in that radio, however I do not know it because I usually unlock it in my radio's.

I also did a search, and asked a few people I know who are also very good with radio's and they do not know either. The only thing I found was this, and you have to pay this shop to do it.

http://cobraworxshopz.com/12.html


Feb 02, 2009 | Cobra 200 GTL DX 4-Channels Base CB Radio

1 Answer

Cobra 200gtl High Power Transmit problem??


Depending on the type of power supply, radio frequency (RF) energy from the transmitter may be 'fooling" it into thinking that you're overloading it. Check to see if there's any discernible dimming of the meter lamp when this problem occurs, if so, the supply is the culprit.

Otherwise, its probable that the final amplifier transistors are overheating, either they are 'leaky' or not properly attached to the heat sink.

Jun 23, 2008 | Cobra 200 GTL DX 4-Channels Base CB Radio

2 Answers

Connex 3300 hp


U mean on sideband? Frequency counter only useful on other than sideband operation. This does not mean the carrier insertion osc. is on frequency. If it needs adjustment, your voice will sound high/ low on transmit. Incoming signals will sound right after adjusting the osc.

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No AM carrier or modulation. SSB transmits good


what cb is it ? it sounds like your am section is not getting powered up when you switch from ssb to am. If i know the model i may have a diagram of it here and suggest a place to start

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