I have an RCI 2950 first generation with low receive in AM only, SSB receive is fine, any ideas would be greatly appreciated.
My apologies, meant to add that to post, FM is fine as well.How's on FM?
Thank you very much, this info is greatly appreciated.Area of interest marked red.
View attachment 63576
Thank you very much, I was looking at schematic tonight and saw that, I will definitely check it in the morning.More than once I have seen C25 go open after 15 or 20 years. Easy enough to check, just poke the solder pads under C25 with the leads of a new 10uf cap. If the AM receive comes way up when the leads of the new cap touch the foil pads, C25 is open.
C25 serves to allow negative feedback for the DC voltages only in that section, but not for signal voltages. If C25 stops filtering the 455 kHz signal, it reduces the gain.
73
Fixed mine, C25 was ok but I replaced anyways, But C88 was shorted, replaced and all is well.Funny enough, I have one with the same exact problem!
Hey there buddy. I hope you are well!!!I thank you very much!
Yes, I've also had that capacitor (C25) go "open" (ie: down into the nF range.!) which causes very weak (microvolt-wise) and very quiet (volume-wise) AM receive.!More than once I have seen C25 go open after 15 or 20 years. Easy enough to check, just poke the solder pads under C25 with the leads of a new 10uf cap. If the AM receive comes way up when the leads of the new cap touch the foil pads, C25 is open.
C25 serves to allow negative feedback for the DC voltages only in that section, but not for signal voltages. If C25 stops filtering the 455 kHz signal, it reduces the gain.
73