GQRX Settings
When a satellite is about to pass, do the following (with GQRX still "OFF")
1. Tune to the desired frequency
2. Mode = Narrow FM
3. In Mode Options:
a) Select "APT (17k)" for max dev
b) Tau is "OFF"
4. AGC is "OFF"
Input Controls
5. Hardware AGC (seems to work better than a manual setting)
6. "DC rem." is checked
In the Audio Controls:
7. Gain is set to 5dB
Audio Settings
With this setup, one could record a wav file of the APT satellites signal, resample, and load it directly in to WxtoImg. However, I prefer to watch WxtoImg build the image as I listen. Since I am on a Macbook Air (and there is no "Line In") I will have to fool WxtoImg into listening to a virtualized line in.
Install Soundflower. This will allow you to pipe your desktop sound output into your virtualized line in.
In OSX's "Audio Settings", select your input device as "Soundflower 2ch"
In "Audio Midi Setup" in OSX click the "plus" box and create a new "Multi Output Device". Select the checkboxes for "Built In Output" and "Soundflower 2ch". Now you will be able to hear the signal as WxtoImg builds the image!
Looking in WxtoImg's Satellite Pass List, you will see a list of NOAA satellites when they will be passing near you geographically, start time, duration, and frequency. When it is time, simply tune in GQRX to the listed frequency