I removed the delay time (DT) variable from the receiver code.
Information is easily being transferred from one Arduino Uno to another Arduino Uno.
I then put the transmitter code in the Arduino Pro Mini (3.3 V, 8 Mhz) and
the receiver code into the Arduino Uno (5V, 16 Mhz).
This time around there is no delay time (DT) in the void loop of the code.
Still no transfer of information.
I wanted to see if this was an issue between different models of Arduinos.
So I have the transmitter Arduino Pro Mini (3.3V, 8 Mhz) hooked up outside and transmitting data.
I then uploaded the receiver code to another Arduino Pro Mini (3.3V, 8 Mhz) that's hooked up to my PC and I am monitoring the data through the serial monitor and it works!
Really weird that two different Arduino models can't talk to each other via the HC-12 modules, but if they are the same model they can talk to each other.
When they are the same models the HC-12 modules are working!
A mystery to me but maybe useful for others if they run into similar issues.
Thanks again everyone!
Here are pictures below:
Here is some sample data from the Receiver Arduino Pro Mini:
<964,891,854,972,4056,106>
AZIMUTH MOTOR STOPS
ELEVATION MOTOR STOPS
AZIMUTH MOTOR STOPS
ELEVATION MOTOR STOPS
AZIMUTH MOTOR STOPS
ELEVATION MOTOR STOPS
AZIMUTH MOTOR STOPS
ELEVATION MOTOR STOPS
AZIMUTH MOTOR STOPS