Multisim - AGC (JACK-AL version)
Continuing my curiosity on how an AGC works in practise, I tried to
simulate the mentioned AGC circuit using Multisim.
The simulation runs for a few seconds and then comes up with an error message.
The S-Meter output shows the output signal in nV/dbm but it is very
low even if I increase the signal level. What would be the signal
level in uV after 2 stages of amplification, should I be trying to
simulate a complete section before trying to simulate the AGC on its
What I am doing wrong/not reading correctly?
I've also added the first stage of the uBITx as a test, this works
correctly. Both files are in the same folder.
Thank you for your time.
I'm here to add more value to the world than I'm using up.
I am not prepared to repair your simulation fault - but I can provide a clue on the AGC. it is similar to the hybrid cascode (hycas) introduced by W7ZOI. see what info you can find online - the article or related into may be there. if not email me and I will dig for it.
also the Jackal developers will gladly answer your questions also.
if you did your own circuit - I would carefully check the front end matching on the input of the IF AGC amplifier. if it is similar to the hycas, it requires a trimmer capacitor to peak the response.
73 Curt wb8yyy