Recent content by Osscott

Well this post is about a decade late but I thought I would share my solution to the popping sound when keying and unkeying. It reduced the volume to such a low level I consider it a very acceptable solution. I tried many of the posted solutions but most addressed the symptom instead of root...

Well the uPD1156 was not the issue. that's the bad news. The good news is C88 a tantalum capacitor was the culprit. tested ok but clearly it had issues. the bacon sizzling noise (even when volume off) vanished when i replaced it with same value electrolytic! that problem solved. i realigned...

Would be great if UNIT_399 or another SSB 858 guru could comment. Another update... I am now getting static and other noise coming from the speaker. same noise on internal and external speaker. Happens with volume up or completely off. volume knob does not influence this noise nor does the...

Checked all three caps. within spec. so i played with increasing the capacitance of C44(AM+SSB) and C43(SSB Only but added to C44). All that did was appear to increase the recovery time. Makes sense. So i put those back to stock. AGC recovery time was fine with 4.7uF and 10uF, respectively. C42...

Thank you Nomad. I already replaced all the caps in the radio with non-Chinese ones from reputable manufacturers and verified their values before installing. I will take another look at these specific ones. Perhaps try some higher values. :)

I have also tried the 1N6263 schottky diode mod for D15/16 and D10/D11. Same symptoms with the schottkys or the 1N60Ps. Thank you!

Also, may be related... NB circuit does not appear to be working. NB on/off switch verified to be operational and does bring the circuit online. The Signal strength meter will not go below 1 s-unit on SSB mode (AM is S0) when the radio is connected to a dummy load. I have not attempted to...

Reviving this thread since it is fairly on topic... Hoping there is someone out there that can assist. I have a TRC-457 that is having what i believe to be an AGC issue. I see in this thread a fix was developed with C63. However, the CC 40D is a very different radio. When i receive very strong...

never mind, it was the ssb carrier balance out of whack. :)

Well it appears the SSB balance was out of whack, which was odd because i had aligned that when i completed the recapping. dont know why it needed to be realigned again. perhaps it was inadvertently moved. anyway. all good now. :)

i have a very similar problem on SSB only. Would this fix apply?

Hoping someone smarter than I, can assist with diagnosing this high pitched tone i get when TX on SSB. Does not happen on AM. Symptom: When TX on SSB, a high pitched squeal like tone is heard on the RX of other operators. Troubleshooting: changed mic and same thing. keyed up radio with no...