I have a question, I have kept my mouth shut for a couple years mainly to avoid the controversy involved and let people think / do whatever they want to with their radios (because ultimately they will anyway) but when did this 2SC2999 modification for receivers that has been floating around the Internet for YEARS become so popular?
The reason I ask, is that I believe that any *engineer* that has actually looked into this would question the validity of this modification as well as it's pros/cons. I have dealt with RCI for a many number of years in the past and am very familiar with their front end / mixer stages. Most of the exports to this day are copies of copies of copies. Even the copies of the Uniden chassis, same rules apply.
My question specifically is why would anyone want to bring up the gain in the front end of the receiver when there is already entirely too much gain in this stage to begin with. If you take that into account along with very W-I-D-E input filtering you are essentially just amplifying noise along with the fundamental signal thus making the S-meter move a little higher but not accomplishing anything.
Then we go further into detail, and we need to look at input and output impedances of each device, as I have seem many people just "swap parts" and even state that at the very least that no realignment is necessary. Also the input to the other stages further down the line are effected as well. Will it work, yes. Is it ideal? I personally believe not.
The same thing with these NPC mods floating around. Even when looked at on a scope and things appear to be functioning, there are many other aspects of a transmitted AM signal that must be looked at. Not just the pattern on the scope, although this is important it is not the key aspect nor the "holy grail" of a transmitted AM signal. I will save that for another thread.
All opinions / technical discussions welcome, but I would like it if we could keep it 100% technical based and not "I got in in my radio and it works". I am not debating it working, I am debating it being technically sound.
The reason I ask, is that I believe that any *engineer* that has actually looked into this would question the validity of this modification as well as it's pros/cons. I have dealt with RCI for a many number of years in the past and am very familiar with their front end / mixer stages. Most of the exports to this day are copies of copies of copies. Even the copies of the Uniden chassis, same rules apply.
My question specifically is why would anyone want to bring up the gain in the front end of the receiver when there is already entirely too much gain in this stage to begin with. If you take that into account along with very W-I-D-E input filtering you are essentially just amplifying noise along with the fundamental signal thus making the S-meter move a little higher but not accomplishing anything.
Then we go further into detail, and we need to look at input and output impedances of each device, as I have seem many people just "swap parts" and even state that at the very least that no realignment is necessary. Also the input to the other stages further down the line are effected as well. Will it work, yes. Is it ideal? I personally believe not.
The same thing with these NPC mods floating around. Even when looked at on a scope and things appear to be functioning, there are many other aspects of a transmitted AM signal that must be looked at. Not just the pattern on the scope, although this is important it is not the key aspect nor the "holy grail" of a transmitted AM signal. I will save that for another thread.
All opinions / technical discussions welcome, but I would like it if we could keep it 100% technical based and not "I got in in my radio and it works". I am not debating it working, I am debating it being technically sound.