P100 provides a "tuning indicator" for CW, RTTY, or similar applications. It allows you to tune your ham rig for precise zero-beat with a received signal. The program started as an emulation of the Z100 hardware product from K8LOA's Clifton Laboratories. Like much of the software provided on aa6e.net, it is as much a tutorial for how to do things in Python as it is a useful utility. (But I hope it will be useful!)
P100 v 0.10 was developed for the Linux platform using ossaudiodev. Version 0.20 uses PortAudio and PyAudio, which is compatible with a wider group of platforms -- including recent versions of Ubuntu.
From the Python source v 0.2:
# Requires wxPython and numpy packages # Ubuntu 11.04: python-wxgtk2.8, python-numpy, python2.6 # This version adapted to use PyAudio, which works with PulseAudio in Natty. # P100 is a re-envisioning of K8ZOA's Z100 tuning indicator as a Python # program running under Linux. (It was developed with Python 2.5.1 # and Fedora 8.) It is a simple audio spectrum analyzer with a LED-like # display. Unlike the Z100, which uses a hard clipped audio signal, # P100 works with 16-bit sound samples, processed with an FFT. This # results in better performance when the signal of interest is not strong. # Two display modes are provided - linear and log. A number of discrete # center frequencies are available from 400 to 1000 Hz. "LED resolution" # is fixed at 28.7 Hz, which is convenient to calculate with a 256-point # transform. To keep the CPU load low (~ 4% on an Athlon XP 2000+) and to # provide reasonable real-time responsiveness, we only look at roughly # 14% of the available data. This program started as a sort of toy, # but it might actually be useful for CW or RTTY operations.
View and download the source:
Updated: 1/29/2008; Wikified 7/6/2010, v 0.2 7/3/2011