21-10-2021, 09:05 PM
There is a lot online re negative feedback. There are advantages and disadvantages with it. It does help with non linearity but not with anything more than slight.
It was way back in the 20s it was added to valve transmitter to cure the "slight`non linearity that all valve AM transmitters suffer from. It is virtually always used in broadcast AM transmitters but not in Amateur Radio as its is frequency dependent so different parameters are required.
One disadvantage is if the TX is over modulated the feedback can swing positive causing it to go into an overmodulated squeal, only shutting it down will stop this.
So there are advantages and disadvantages to NFB. I will give it a go but TBH this sounds extremely good and any improvement will be marginal.
It was way back in the 20s it was added to valve transmitter to cure the "slight`non linearity that all valve AM transmitters suffer from. It is virtually always used in broadcast AM transmitters but not in Amateur Radio as its is frequency dependent so different parameters are required.
One disadvantage is if the TX is over modulated the feedback can swing positive causing it to go into an overmodulated squeal, only shutting it down will stop this.
So there are advantages and disadvantages to NFB. I will give it a go but TBH this sounds extremely good and any improvement will be marginal.
