You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.
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...
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?)
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.
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...
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...
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...
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...
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.
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...
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.
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...
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?
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...
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...
This forum does not allow a single user to have more than one username. If anyone wants to change their username contact an admin and it will be done. Multiple accounts belonging to the same member will be deleted without warning.