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Post subject: Signal Strength Comparison Circuit Posted:
Fri Oct 28, 2005 6:06 am
Just wondering if anyone could help
me with a problem:
Basically I am using two separate AM receiver
modules and I want to display the strength of the received signals (using
RSSI pin) however I only want the strongest signal of the two to be
displayed. I intend to have a stepped L.E.D series for each of the modules
to indicate signal strength, however i only want the LED series displaying
the strongest signal to be active at any one time.
Does anyone have
any ideas for creating this kind of signal strength comparison circuit?
Does anyone know of any similar circuits that I could modify or use
Post subject: Posted: Mon Oct 31, 2005 5:15 pm
RSSI out of each module is a analog voltage, then all you need is a
simple comparator IC (LM339, LM311, and many others). Run the two RSSI
signals to the comparator inputs. The output of the comparator will
be high is one is greator and low if the other is. You might use the
output to blank one display or the other through whatever means you
have available. You might need to add a little more analog logic for
cases where neither one has a signal (i.e. blank both).