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Search results

  1. B

    Need Amp Recommendation

    Recommendation for a decent base amp that will do 500-800 watts for 10/11 meters?
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    Tube Amp causing high SWR at Radio when "on"

    So I have an old 9 tube base amp (PAL 750b). The radio has an SWR meter built into it and I have an external watt/SWR meter at the antenna side . When I key the radio with the amp off or on stand by, the SWR at radio and meter are nice and low. But when I put the amp on, the SWR in the radio...
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    What caused L39 to burn up ?

    L39 in my Cobra 2000 fried and looks like mode switch is toast. Unsoldered driver and seems to be ok on the meter.
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    Substitute for L44 Cobra 2000

    Anyone have a clue if there is a viable alternative for L44 in my Cobra?? Mine is corroded and slightly damaged and causing lots of issues in the circuit. I don’t have an old radio to pull one from. Or do you know what the specs are on it (uH?)
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    Mode switch for Cobra 2000?

    Anyone know where I can get a mode switch for a Cobra 2000? I don’t think there is any aftermarket equivalent and I don’t have a scrap radio to pilfer from.
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    Cobra 2000 No voltage at Test points 7 and 8

    There is no voltage at TP 7/8 posts. So therefore no voltage at final or driver. Trying to figure out where the disconnect is. Where does that 13 volts originate? Looks like maybe comes from mode switch? There is 13 volts at the white wire post on the switch per the schematics. The orange wire...
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    Cobra 2000 final/driver bias question

    Is it possible to test and or adjust the final or driver bias if L39 and final is not present at all? I was troubleshooting problem in that area. I pulled the final and L39 choke which burned up. But when I try to check the bias current now, there is no reading at all for either the driver or...
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    What is a suitable Sub for the L39/42 RF Choke in Cobra 2000?

    Given that you cannot get these OEM anywhere unless you happen to have junk radio to raid, (which I don't) does anyone know what a proper substitute would be and/or what the specs/ratings is on these? Not shown anywhere in the specs or sams facts...
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    Burned up RF Choke on Cobra 2000 and now....

    burned up L39 while working on a no tx power issue. when it had that surge something else has happened. The radio will not transmit. When you key the mike, the receive light stays on and very bright. When I flip the CB PA switch to PA, the receive light stays on bright. When you key the mike...
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    Need an L39/42 RF Choke from a Cobra (or more than one!!)

    Burned one up due to an issue with that strip. Anyone have one (or more) they can part with or what would a proper substitute be? Don't know where else to find these and there’s no specs in the Sams Facts on what it is. Thanks.
  11. B

    No Power to board? But meters light up.

    My Cobra 2000 has yet another problem. It’s connected through a DC power supply that has 13 volts in. the radio turns on and all the meters light up nice and bright. But there is no power to the board otherwise. I changed the voltage regulator but that made no difference. I lifted pins 1 and...
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    Need new channel board for Cobra 2000

    Anyone have or know where I can find a replacement channel board for a Cobra 2000? One I have is cracked down the middle and is not working.
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    Anyone have a working Channel readout board for Cobra 2000?

    Need to replace this board. Anyone have one to sell?
  14. B

    Cobra 2000 No Tx.

    Replaced driver, final and various other suspected parts. Absolutely no tx power on am or ssb!
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    Need a Cobra part!!

    Does anyone have access to torroid coil board number L44 from a Cobra 2000?? Need to replace mine and there is no where to buy this part. thanks!!!
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    What gauge is the wire?

    What is the gauge of the solid wire in my Cobra 2000, say for the jumpers? I was looking to buy a roll of solid (I have lots of stranded) but I didn’t know what gauge to buy. Thanks.
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    Cobra 2000 AMC and ALC Issue/Question

    So I was restoring this 2000 back to stock in the audio by replacing TR24 so I can adjust the AM modulation. After putting it back I still could not adjust the modulation and then I Noticed that R131 was also missing and and R124 and 126 were changed to 4.7k. So I replaced 131 with a new 10k...
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    Cobra 2000 Frequency Counter shorted?

    Long story but had a banana clip lead attached to inside radio. Other snd touched the ground lit in a power supply. The frequency counter/clock went out. Didn’t check the rest of radio but first glance no other obvious issue. Any place to start to look for the issue?
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    Can you fix the LED segments on Cobra 2000 channel selector?

    Is there a way to actually repair the channel selector segments that are out on the cobra 2000 channel selector LEDs? I have a couple out but it is basically impossible now to find OEM replacements for them and I don’t know if there is some “equivalent” you can buy to replace them. Any advice...
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    Cobra 2000 No TX power then whole radio died

    I have very little Tx. I replaced the driver and final thinking one was bad but still nothing. I’ll get a few watts out of it and then it drops off while you are keyed. And the SWR seems to be jumping around as well. I cannot peak the tX more than a couple of watts max. And I have a really...