Recent content by eldorado303

tnx mb91.

Thanks for the answer, Robb. The diodes, are ok. I then checked why tr38, driver, wasnt getting collector voltage on tx, since tr41, had voltage on the emitter ( AM mode ), and followed the connection to the mode selector switch. The voltage came in, but did not came out through the other wire...

Hello everyone. I am fixing a Cobra 148 gtl that had some problems. Some issues are fixed, but some are still there. The radio has reception on all freqs and modes, no problem. The radio only transmits sometimes on USB, full 15 watts, no audio problems, and when tx's it is not intermittent. No...

Hello everyone. I am still having some problems with the amp. I am getting around 80W on position 1, with 10W in, on SSB, on position 2, I get around 100W, but I dont get more than 100W. Switching to 3, 4, 5, and 6 only gets me around 100W, and I've noticed one of the transistors gets hotter...

The amp is working. I figured out what was wrong. A resistor that goes to the collector of the PA bias transistor was fried. It's a 1 ohm, 1/2W. I replaced it with 3 10ohm resistors in parallel, because I had no 1ohm resistor available, and I got the amp working. I still got one issue though...

hello vkrules. thanks for the help. the resistors on the power switch board, are all ok. The finals on the rig are also ok. What do you mean to check whats common to all the sw positions? As I told you, the sd1446, shows around 0.500 between collector and emitter. Do you think they may have gone...

Hello everyone. I just got some new SD1446 transistors for my KL500, since the last ones burned out. I replaced them, and all was ok, I tx'ed with 1W carrier on AM, around 27megs and was getting some amplification. But I had an issue, the power selector that goes from 1 to 6, had some small...

Hi space cowboy. I hadnt before you asked, but had thought about it. Now I have, and it's ok. I even bypassed the mic gain pot, and the audio is still low. The roger beep sound ok though. On the radio's schematic diagram, you can see the modulation path, and the roger beep is directly fed to...

Hi guys. I just acquired Galaxy Saturn II ( SS3900F ) with some issues. Some of them I've already solved. One that I havent been able to solve: modulation is very low, and mic gain does not have any effect on the modulation. I can turn it all the way down, and it still has modulation, and all...

Hi guys. I got the PLL in the mail today. I replaced the old one with the new. Then I measured voltage at TP9, and adjusted L19 for 3.2V on CH40. I changed to CH1 and the voltage remained very similar, around 3V. I pressed the PTT ( with antenna connected ), and the RX/TX went red for a couple...

Hi guys. I've received the MB3756 today and I did like you told me, I desoldered pin 9 at the PLL, and tested both pin 1 on the voltage regulator and the pin 9. Pin 1 on the MB3756 tested 8.3V, and I also got 8.3V at pin 9 on the PLL. I then soldered pin 9 of the PLL back and measured...

Thanks for the help guys. I've bought a MB3756, and am just waiting for it to arrive through the mail. I will do those tests like you told me. And I'll keep you up to date. Thanks, João G.

Thanks Robb. Yes, the multimeter is accurate. I dont have any mb3756 here, but I guess I'll buy one soon and give it a try. Other thing, how can I know if the PLL is ok? I have the CH numbers on the display, but since no RX and TX, is there any way I can know?

Hi guys. I was just checking the stuff you told me. The PLL pin 9 is not at 8v its at 11.2v. Also I've checked C84 and C95 ( not with my multimeter because it doesnt have capacimeter ), but visually they seem ok, the are not swollen or open. ( of course I know it doesnt mean they are ok...

Hello guys. I have recently bought a non working 148 gtl. I would like to know some opinions on what might be the problem(s) with it. I have no RX, no band hiss whatsoever. Also no TX, the light does not change to red when the ptt is pressed. The PA does not seem to work also. I have...