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Cobra 200 Rf mosfets

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What about the mosfet's?

Posted on Mar 30, 2014


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What causes the rf MOSFET to go on a cobra 200gtl

mosfets are seemingly very unstable the culprit probably is too high of dead key on the radio back it down a little and no there is no upgrade also on that radio if someone is real close to you and keys up it can give you what is called front end overload and it will have no receive and will require a trip to the cb shop to correct this problem also if you use the extra channels in it they are hard to understand just what channel you are actually on .........I had one of these radios and I did NOT like it or the cobra 150 . they seem to be very fragile radios............good luck !!!!!

Mar 23, 2014 | Cobra Radio Communications

1 Answer

What causes the rf MOSFET to blow on cobra 200?

They blow for all kinds of reason. Just replace them an check resistors around them. Caps should be checked as well. Just replacing mosfet is not usually enough. They have a way of taking other components out to.

Mar 23, 2014 | Cobra Radio Communications

1 Answer

What is rf gain cotrol on a cobra cb radio

Rf gain on a cobra 29 is the same as on any other radio. When you turn the knob all the way to the right the RF increases to draw in signals that are far away nut if you turn it to the left only the nearest stations will be picked up.

Sep 22, 2012 | Cobra 29 LTD CB Radio

1 Answer

I have a cobra 200. The receive is some distortied, Most signals appears to be overmodilating with normal volume.

When the signals you are receiving are too strong "over-modulated" turn back your RF which will turn down the sensitivity of your receiver. If they are still over-modulated it may well be the other person has their modulation turned up too high from changing the setting inside their radio, turning up their mic gain or having their power mic turned up too high.

Jan 27, 2011 | Cobra 200 GTL DX 4-Channels Base CB Radio

2 Answers

My cobra 200gtl has no transmit

hi More than likely your pa transistor has blown have you checked it with a power meter if so r you getting the red tx led when the ptt is pressed if so then your problem lies with the rf transistor
replacing rf transistor

Jan 18, 2011 | Cobra 200 GTL DX 4-Channels Base CB Radio

1 Answer

Looking for motorola cb finals...Where can i find some. Please disregard if there is a charge. No new email too me other than this quiestion, please. thanks.

I believe you mean Mitsubishi 2SC1969. The eleflow 2sc1969 is a cheaper and equal if not better performer. There are a lot of fake 1969s out there.
I perfer irf520 mosfet more durable with high swr antenna system and cheaper Mouser.... have not used them but heard good things, RF Parts..expensive and Digikey.... expensive this place is cheap but very slow shipping 3 weeks for my stuff but good quality.

Jan 08, 2011 | Cobra 29 LTD CB Radio

1 Answer

I need a schematic for a RF p300-1 amp. Im trying to replace 2 of the mosfet semiconductors that got fried.

There are no schematics for RF amps, normally RF uses standard IRF Mosfets. Can you decribe the area where they blew, Power Supply are usually N-Channel high current type. Outputs can be either N-Ch or P-Ch depending on the Power rail there attached to.

Dec 23, 2010 | Rockford Fosgate P3001 Car Audio Amplifier

1 Answer

200 gtl dx has no output but still recieves,who works on these

Known bugaboo with these radios, weak design in the RF amp. Needs to go to a good shop. Email me......

Feb 02, 2010 | Cobra 200 GTL DX 4-Channels Base CB Radio

2 Answers


Yes, I found out what it was. the driver was bad. I guess these radios are very sensitive to static electricity like carpet shock. It will take the driver out. You can get it from RF Unlimited.

Aug 28, 2008 | Cobra 200 GTL DX 4-Channels Base CB Radio

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