{
"cells": [
{
"cell_type": "markdown",
"id": "389c215a",
"metadata": {},
"source": [
"![\"sdr\"](\"./sdr_dongle.jpeg\")
"
]
},
{
"cell_type": "markdown",
"id": "a184a196",
"metadata": {},
"source": [
"Finding interesting signals: heat maps and callsigns \n",
"https://medium.com/@rxseger/finding-interesting-signals-heat-maps-and-callsigns-a269392a4168"
]
},
{
"cell_type": "markdown",
"id": "2d7f2d5a",
"metadata": {},
"source": [
"Example Commands\n",
"\n",
"rtl_power -f 144M:146M:100 -g 50 -i 1s -e 30m data.csv\n",
"\n",
"Captures from 144MHz to 146Mhz in 100Hz intervals with a gain of 50, taking samples every 1 sec, for 30 minutes, and saving into the file \"data.csv\""
]
},
{
"cell_type": "markdown",
"id": "56958d5d",
"metadata": {},
"source": [
"Parameters\n",
"\n",
"-f lower:upper:bin (Hz)\n",
"\n",
"Frequency range and the size of the bin\n",
"\n",
"-i \n",
"\n",
"Amount of time to integrate for each sample\n",
"\n",
"-g \n",
"\n",
"Gain for the sdr\n",
"\n",
"-e \n",
"\n",
"Amount of time to collect for"
]
},
{
"cell_type": "code",
"execution_count": 16,
"id": "f22979f4",
"metadata": {},
"outputs": [
{
"name": "stderr",
"output_type": "stream",
"text": [
"Number of frequency hops: 1\n",
"Dongle bandwidth: 2000000Hz\n",
"Downsampling by: 1x\n",
"Cropping by: 0.00%\n",
"Total FFT bins: 32768\n",
"Logged FFT bins: 32768\n",
"FFT bin size: 61.04Hz\n",
"Buffer size: 65536 bytes (16.38ms)\n",
"Reporting every 1 seconds\n",
"Found 1 device(s):\n",
" 0: Realtek, RTL2841UHIDIR, SN: 00000001\n",
"\n",
"Using device 0: Generic RTL2832U OEM\n",
"Found Rafael Micro R820T tuner\n",
"Tuner gain set to 49.60 dB.\n",
"Exact sample rate is: 2000000.052982 Hz\n",
"[R82XX] PLL not locked!\n",
"\n",
"User cancel, exiting...\n"
]
}
],
"source": [
"!rtl_power -f 95M:97M:100 -g 50 -i 1s -e 10m data.csv"
]
},
{
"cell_type": "markdown",
"id": "4a3e2667",
"metadata": {},
"source": [
"python script called \"heatmap\" by Kyle Keen. This converts the csv file into an image. \n",
"\n",
"python heatmap.py