The personal website of Scott W Harden
July 26th, 2009

PySquelch: A Python-Based Frequency Audio Activity Monitor

I'm pretty much done with this project so it's time to formally document it. This project is a collaboration between Fred, KJ4LFJ who supplied the hardware and myself, Scott, KJ4LDF who supplied the software. Briefly, a scanner is set to a single frequency (147.120 MHz, the output of an active repeater in Orlando, FL) and the audio output is fed into the microphone hole of a PC sound card. The scripts below (run in the order they appear) detect audio activity, log the data, and display such data graphically.

Here is some sample output:

Live-running software is current available at: Fred's Site. The most current code can be found in its working directory. For archival purposes, I'll provide the code for pySquelch in ZIP format. Now, onto other things...

Markdown source code last modified on January 18th, 2021
---
title: PySquelch: A Python-Based Frequency Audio Activity Monitor
date: 2009-07-26 00:22:12
tags: python, old
---

# PySquelch: A Python-Based Frequency Audio Activity Monitor

__I'm pretty much done with this project so it's time to formally document it.__  This project is a collaboration between Fred, [KJ4LFJ](http://www.qrz.com/kj4lfj) who supplied the hardware and myself, Scott, [KJ4LDF](http://www.qrz.com/kj4ldf) who supplied the software.  Briefly, a scanner is set to a single frequency (147.120 MHz, the output of an [active repeater ](http://www.147120.com/) in Orlando, FL) and the audio output is fed into the microphone hole of a PC sound card.  The scripts below (run in the order they appear) detect audio activity, log the data, and display such data graphically.  

Here is some sample output:

<div class="text-center">

[![](test_24hr-1_thumb.jpg)](test_24hr-1.png)
[![](test_average_thumb.jpg)](test_average.png)
[![](test_alltime-1_thumb.jpg)](test_alltime-1.png)
[![](test_60min_thumb.jpg)](test_60min.png)

</div>

__Live-running software is current available at: [Fred's Site](http://kj4lfj.dyndns.org/147120/stream-data/pySquelch.html)__. The most current code can be found in its working directory.  For archival purposes, I'll provide [the code for pySquelch in ZIP format](http://www.SWHarden.com/blog/images/pysquelch.zip).  Now, onto other things...