Recent content by 2FB327

Yes, I have some parts radio and will start there.

That's what's frustrating, I checked the alignment according to the manual and have the pattern on the scope on channel 19 and it changes with L22 and it's there on channel 1 and 40. With the voltmeter on R88 I have the 3.2V and it changes with L19.

I was given this radio and have no history. It looks to be a virgin, limiter intact, wax on cans, no spread coils. On RX, when hooked to the generator and set on channel 19, the tone is audible on 18 and weak on 17. On TX, it has carrier and mod from channel 1 thru 17 then nothing. What would be...

Stan is scary, I probably won't be able to sleep for days.

Thanks, I'm going to get after it now.

Thanks Joe Dirt. I printed what I could find on cb tricks to try to find someplace to start as far as the 3600 board but I'm still not sure which set up to use as far as the alignment. Let alone the hacks, what ever he did is in the mod circuit, I'll check for the resistor/diode at R228, put in...

Thanks, yes they were spread. So is TR 32 the modulation limiter? I have the correct transistor and will install it and check and correct at R 228. I have picked up a spectrum analyzer and I am learning how to use it, but I can see this thing is dirty. Rob, is there a tutorial on how to set 2nd...

That's right, how to unhack a nice radio. It has the Ranger 360015c board in it, I searched cb tricks and found some similar ranger boards and set the bias down, the radio was so hot you couldn't touch it, and set the low and high powrer carrier down. On the scope the when you add modulation it...

I got stacks of these, private message me and I'll send you one..

Thanks. I do enjoy fixing things. It's the Frankinsteen in me.

I don't know if this will help you. Something I found. The Receiver This looks so complicated. And over whelm the new person trying to read the schematic. So lets block this together to make it a bit easier. Let’s get to know what is happening in the AM receiver of this Cobra 29. Go here...

Swapped and tested mic's, tested ok. Problem fixed, the radio must have had a channel kit or echo? in it. I found the yellow wire from the center of the dynamike to w-32 came apart at the heat shrink where they had a splice. Now I have a test radio to test circuits on the bench.

That's not it, I pulled and tested a bunch of caps in that area, still nothing. Where does the audio originate? It doesn't make sense, the noise and voltage is there at the audio chip? Where to start?

Will do and I'll check the voltages in the diagram.

Next in the stack of radios from the unknown. Is a 1998 cobra 29 with a KEPL-255 board. The radio receives and it has a 5 watt carrier but no mod. I went thru with my FC and have the frequency from the mic pins to the so 239 but no mod with good known mic's. If I touch pin 4 of the audio chip I...