re. App note on Gain and AGC
Posted: Wed Jun 13, 2018 8:51 am
Thanks for the application note and forgive the naivety of my questions
I know nothing about the dynamic range, linearity or overload capability of the mixer, is it useful or possible for you to specify an optimum received signal strength or a range of levels in dBm that the mixer is happiest with?
Assuming there is not much internal noise level generated by the LNA or AGC would it be best (in a crowded HF ham band for example) to operate with an eye to reducing the broadband gain of the LNA and push up the narrow band gain of the AGC?
If the answer is yes, would it be better to alter the default set point of the AGC loop or go full manual? I've never played with the AGC settings in SDRuno because I only know enough about AGC curves to get myself in trouble. I guess the answer is going to be dependent on too many other variables like the number and relative strength of signals in the passband.
Now for a really stupid question, given that the zero offset DC mix product is visible in the receiver, presumably it's not part of the AGC loop?
Regards, Phil
I know nothing about the dynamic range, linearity or overload capability of the mixer, is it useful or possible for you to specify an optimum received signal strength or a range of levels in dBm that the mixer is happiest with?
Assuming there is not much internal noise level generated by the LNA or AGC would it be best (in a crowded HF ham band for example) to operate with an eye to reducing the broadband gain of the LNA and push up the narrow band gain of the AGC?
If the answer is yes, would it be better to alter the default set point of the AGC loop or go full manual? I've never played with the AGC settings in SDRuno because I only know enough about AGC curves to get myself in trouble. I guess the answer is going to be dependent on too many other variables like the number and relative strength of signals in the passband.
Now for a really stupid question, given that the zero offset DC mix product is visible in the receiver, presumably it's not part of the AGC loop?
Regards, Phil