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http://gokarters.com/smf/index.php?topic=2330.0 You can give this a quick read. The author shows a nice diagram of a cobra 29 chassis and it's functional sections. Sent from my iPhone using Tapatalk

Yes, I have tried a different mic. I have also checked the volts on VCO. All seems to be fine. There is an old echo board but no other mods. I have gone over the echo and all looks good except it was a truck stop mod. A-hole just allowed the board to sit in there freestyle like. who knows the...

Thank you both. I have changed the majority of the electrolytics especially around the AF amp and volt reg. But I will change the remaining ones. This has really puzzled me. Will ceramic caps intermittently work/fail, or will they just die?

Ok. The radio receives fine.......AFTER...I key the mic. And that's only majority of the time. There are times that it won't come back after I key up. I have changed TR35 and D43 thinking it was the switching trans. I am thinking it's the AGC because when the RX is out, it's not out completely...

Thank you all for your input. I never got any messages saying this thread was getting any action. I am on maul droppers and just joined cbradioroforum. Both seem to be the "living-room chitchat" type that was mentioned earlier. CBRC was a nice place. Seemed to be a smaller group that was more...

I can't believe it! CBradioclub.com has shut down!!! Is there another club page out there that is dedicated to the CB hobby like that one was? No offense to this forum, but some members of this page (hams) don't care for the hobby of CB like I do. Only some. Not running all us hams in the mud.

Yeah, I took it to a seasoned Tech but he couldn't help me. Not with surface mount technology.

I have TX power, but no modulation. Swapped mics, I do have audio on PA and hear myself with talkback, but nothing on Mod meter nor can I hear myself on test radio. SSB works fine. Normal RX on 980. There's really nothing on this radio out there. Anyone know where I can get a schematic or has...

I usually use the RF Gain knob for talkback. Remove the resistor jump and used 2 wires, one on each jack. Then unsolder the wires going to the rf gain and resolver them together. I don't know a lot of ppl the evened with the rf gain anyway. Then the 2 wires coming from the speaker jacks go in...

Anyone have this issue before? Everything has been checked a few times. But D8 is blowing! Any ideas? Done this mod a few times. Never had this problem. This is a '97 model with mic mount on the side.

Yes, it's still there when I unplug the coax. You can really hear it when I turn off the ANL. But still very audiable and annoying with it on. Can't hear anything similar on my bench radio though. So it's nothing from my equipment. Happens with both AC and DC power.

GE Superbase has had this very loud crackling in the receive. I cannot tell where it is coming from. I replaced all of the elec. caps on the top board (which is 99% if not all of the RX and audio). I will be replacing the audio IC in this radio anyway. And i can't quit get the RX to open up...

Hello, I was able to locate a Superbase on eBay that was for parts. Hooked it up and got a popping crackly every time I played with the volume. Cleaned that VR. Then seemed to be ok. Did the initial alignment of her and now she's tx'ing poor and I lost a lot of receive sensitivity. BN and ANL...

Awesome. Thank y'all!

Ok. I've been trying to improve the RX in my CBs and one of the tips I got was using "larger" cap filters in the Audio section. I'm not that familiar with caps. So are they referring to the capacitance or the voltage? Would I replace a 1000uF 16V with a 2200uF? Or a 1000uF 50V? I'm not...

G

Ok, been kicking my butt for a couple weeks now. replaced Audio IC and Pwr IC (Pwr IC was replaced for a different issue). replaced caps C172, 175, 176, 186. Replaced TR19 and TR43. TR14 was upgraded for the 2999 rx upgrade. No audio from any port (phones jack=unknown). No audio in CB or PA...

Honestly, I believe that the worth would go down after mods have been done. Especially a channel mod. I will be selling one myself that I fixed up. I got it for $25 because the guy couldn't get it to power up. The channel selector was shorting out the circuit enough to mimmic a total power...

Ok. The meter moves, so the RX is fine. Swapped mics, RF is all the way up. Checked switch for speakers, etc. no audio on AM or SSB on CB and PA. I had un-modded the clarifier mod. The frequency counter didn't like the mod at all. I never could get her back on. So i put her back to un-modded...

found the problem This is embarrassing but I will post it. A few weeks ago when I put this radio to bed after I tuned her up, I had ordered a mic (5-pin). The mic never came, got an external speaker by mistake and they haven't answered my emails to correct the order. Anyway, I converted a 4 pin...