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agi-stk

agu

alsa

amtrak

andor

android-7-nougat

antenna

excellent HF propagation in Cycle 23

With little more than a G5RV antenna up about 8 meters in the barn, Icom IC-725 at 100 Watts, an MFJ-945 antenna tuner to match impedance and a firm connecti...

aptx

art-of-grad-school

aspell

aspell user dictionary location

The aspell program is used by many software packages as a spellchecker. Here’s how to find the user dictionary file location.

astrometry

Setting up Astrometry.net program

Astrometry.net allows blind registration of astronomical images, including those from auroral cameras. I have created additional software giving az/el per pi...

at&t

Project Fi technical aspects

Project Fi uses three LTE carriers plus VPN WiFi. Here are some practical details on how the Project Fi aggregating MVNO works.

Survey of 4G LTE Ethernet routers

Geoscience observatories in remote corners of the Earth need connectivity. We have LTE connectivity in many areas despite their remoteness, here are some rou...

audacity

audio

Goldwave audio editor on Linux WINE

Easy install Goldwave audio editor on Linux using WINE. WINE 2.x allows Goldwave 6.x to work, while WINE 1.x allows Goldwave 5.x to work on Linux.

SoundBot Bluetooth headphones

Detailed review of Soundbot SB240 and SB220 Bluetooth headphones–noting some problems with modern Bluetooth source devices.

CD-R is NOT for archival purposes

As CD-R writers become commoditized, some people don’t realize CD-R have a short lifetime, and even standard CD’s don’t live forever.

aurora

Survey of 4G LTE Ethernet routers

Geoscience observatories in remote corners of the Earth need connectivity. We have LTE connectivity in many areas despite their remoteness, here are some rou...

Mathematics of Auroral Viewing

When you observe aurora borealis or aurora australis, what you see is a line integral of the optically thin aurora. Here’s the math.

auroral-tomography

avahi

bash

basler

beamer

bibtex

bikesharing

blackberry

blackberry-hub

bluetooth

boost

boston

Uber Pool walk to pickup Boston

Uber Pool in Boston is starting to require walk to easier pickup locations. Previously Uber Pool suggested better pickup areas.

brother

c++

cad

calculator

calendaring

canon

cb-radio

excellent HF propagation in Cycle 23

With little more than a G5RV antenna up about 8 meters in the barn, Icom IC-725 at 100 Watts, an MFJ-945 antenna tuner to match impedance and a firm connecti...

cdf

cedar-workshop

clang

cmake

Travis CI examples

Having a CI system to check your self-test on each git push can save you from hard to find bugs later.

college-or-work

computer-maintenance

computer-tips

computer-vision

conda

upgrading Scipy via pip

You can install Scipy the quick way via conda, or the general way via pip. Pip install scipy requires a Fortran compiler.

coverage-map

cron

cubesat

cuda

cups

curl

cw-radar

cygwin

data-archiving

CD-R is NOT for archival purposes

As CD-R writers become commoditized, some people don’t realize CD-R have a short lifetime, and even standard CD’s don’t live forever.

data-science

daydream

dd

desense

dosbox

dot-net

dropbox

dual-boot

ef-johnson

email

engineering-education

Student/hobbyist-built radar projects

Particularly with software-defined-radio, it has become feasible for electronics enthusiasts and engineering students to build their own radar. Here are a fe...

eps

ettus

exfat

experiment

f2py

Travis CI examples

Having a CI system to check your self-test on each git push can save you from hard to find bugs later.

fast-ring

fasten

fcc

fedora

ffmpeg

filtering

fits

fortran

Travis CI examples

Having a CI system to check your self-test on each git push can save you from hard to find bugs later.

freedos

freerdp

g++

geoscience

geospace

ghostscript

gimp

git

github

Completely undo errant Github push

For any Git or Github repo, you can undo (delete from git history) the last or previous pushes to eliminate huge/numerous/wrong files pushed.

Overleaf with Github

Use Github with Overleaf, as Overleaf corrupted my document but with Github I could recover it post facto. Using Git a priori stops such corruption.

Travis CI examples

Having a CI system to check your self-test on each git push can save you from hard to find bugs later.

github-pages

glumpy

How to install Glumpy OpenGL for Python

Glumpy uses PyOpenGL for beautiful, fast 3-D and 2-D plotting from Python and Numpy arrays. Here’s an easy way to setup Glumpy–you don’t need a discrete GPU.

gmrs-frs

excellent HF propagation in Cycle 23

With little more than a G5RV antenna up about 8 meters in the barn, Icom IC-725 at 100 Watts, an MFJ-945 antenna tuner to match impedance and a firm connecti...

gnu-data-language

gnu-octave

Install PMTK3 in Matlab / GNU Octave

The PMTK3 library of libraries for machine learning brings together classic Bayesian methods with MCMC and others. Here’s how to install PMTK3 for Matlab and...

gnu-radio

google-drive

google-earth

google-pixel-phone

gpredict

gps

gpstk

gpu

How to install VisPy OpenGL for Python

VisPy uses PyOpenGL for beautiful, fast 3-D and 2-D plotting from Python and Numpy arrays. Here’s an easy way to setup VisPy–you don’t need a discrete GPU.

How to install Glumpy OpenGL for Python

Glumpy uses PyOpenGL for beautiful, fast 3-D and 2-D plotting from Python and Numpy arrays. Here’s an easy way to setup Glumpy–you don’t need a discrete GPU.

h5py

Why use h5py context manager?

Using an h5py context manager helps avoid exceeding ulimit errors from too many open files. Example Python file I/O context manager, including with h5py.

hamlib

harmonic-radar

hdd-ssd

hdf5

Why use h5py context manager?

Using an h5py context manager helps avoid exceeding ulimit errors from too many open files. Example Python file I/O context manager, including with h5py.

Check HDF5 files for corruption

HDF5 files do not currently have a recovery or journaling mechanism. You can have the same file size but a corrupted file. Here’s some ways to check HDF5 for...

Travis CI examples

Having a CI system to check your self-test on each git push can save you from hard to find bugs later.

hf-radar

hubway

image-rejection

Yaesu VX-7 Technical Review

dual simultaneous receive, quad-band transmit and very compact size are three key features of the Yaesu VX-7. Let’s discuss technical characteristics.

imagej

ImageJ-Win64 won’t start

If ImageJ won’t start on Windows, try the one-time command ImageJ-Win64 –cp jars/javac.jar and thereafter the ImageJ icon should work normally.

imagemagick

inkscape

Convert PDF to SVG

DraftSight 2-D CAD actually outputs PDF even when EPS is selected. Convert PDF to SVG vector graphics for high resolution diagram on a webpage without downlo...

interference

inverse-theory

ionosphere

ipv6

Force apt-get to IPv4

Sometimes a remote host or your ISP is temporarily misconfigured with regard to IPv6. You can force apt to use IPv4 as follows.

irfanview

jekyll

labview

lenovo

license-free

license-free-spectrum

lineageos

linux

longley-rice

lowtran

lte

LG Watch Sport W280 initial review

The LG Watch Sport W280 is a substantial improvement over the LG Watch Urbane 2nd Edition LTE. Here are my initial observations on the greatly improved Sport...

Project Fi technical aspects

Project Fi uses three LTE carriers plus VPN WiFi. Here are some practical details on how the Project Fi aggregating MVNO works.

Survey of 4G LTE Ethernet routers

Geoscience observatories in remote corners of the Earth need connectivity. We have LTE connectivity in many areas despite their remoteness, here are some rou...

lyft

marsis

matlab

matplotlib

maximum-entropy

mayavi

Switch from IDL to Python

Python can be a very high performance language for data analytics tasks common to science and engineering. Here is a simple guide to transition from IDL to P...

medium-wave

meteors

mex

microphonic

miktex

miracast

Miracast on Linux in 2017

Google’s effective deprecating of Miracast on most Android phones is frustrating–but Linux support for Miracast is getter easier thanks to Intel Open Source–...

mkdosfs

mkl

Fixing Numpy MKL ImportError

Suddenly I started getting MKL AVX errors upon import numpy. Force reinstalling Numpy fixed the problem as described herein.

mono

motorola

moving

multinet

nano

national-instruments

neo

netcdf

network-manager

new-mexico

nextel

Project Fi technical aspects

Project Fi uses three LTE carriers plus VPN WiFi. Here are some practical details on how the Project Fi aggregating MVNO works.

Wireless WAN in the Midwest

Wireless data or wireless WAN (WWAN) is growing rapidly. Going beyond two-way paging and package tracking to email for business.

nidaqmx

nmap

nmap in Cygwin - seamlessly

Cygwin 2.8 still doesn’t have nmap built-in, but ou can use nmap in Cygwin easily via this two-step install.

ntp

nuc

numpy

Fixing Numpy MKL ImportError

Suddenly I started getting MKL AVX errors upon import numpy. Force reinstalling Numpy fixed the problem as described herein.

nvis

open-data

openbox

opencv

opengl

How to install VisPy OpenGL for Python

VisPy uses PyOpenGL for beautiful, fast 3-D and 2-D plotting from Python and Numpy arrays. Here’s an easy way to setup VisPy–you don’t need a discrete GPU.

How to install Glumpy OpenGL for Python

Glumpy uses PyOpenGL for beautiful, fast 3-D and 2-D plotting from Python and Numpy arrays. Here’s an easy way to setup Glumpy–you don’t need a discrete GPU.

optical-calibration

overleaf

Overleaf with Github

Use Github with Overleaf, as Overleaf corrupted my document but with Github I could recover it post facto. Using Git a priori stops such corruption.

paging

Wireless WAN in the Midwest

Wireless data or wireless WAN (WWAN) is growing rapidly. Going beyond two-way paging and package tracking to email for business.

paramiko

pdf

Convert PDF to SVG

DraftSight 2-D CAD actually outputs PDF even when EPS is selected. Convert PDF to SVG vector graphics for high resolution diagram on a webpage without downlo...

pdftk

perl

pi-radar

Student/hobbyist-built radar projects

Particularly with software-defined-radio, it has become feasible for electronics enthusiasts and engineering students to build their own radar. Here are a fe...

HF Radar spectrum sharing

The thought of FMCW or DSSS radars operating at HF might initially seem frightening, but such radars are sharing HF in increasing numbers.

ping

pip

upgrading Scipy via pip

You can install Scipy the quick way via conda, or the general way via pip. Pip install scipy requires a Fortran compiler.

plot

povray

project-fi

Project Fi technical aspects

Project Fi uses three LTE carriers plus VPN WiFi. Here are some practical details on how the Project Fi aggregating MVNO works.

propagation

psk31

public-safety

pulseaudio

SoundBot Bluetooth headphones

Detailed review of Soundbot SB240 and SB220 Bluetooth headphones–noting some problems with modern Bluetooth source devices.

putty

pygame

python

quick-charge

radio-mobile-deluxe

railroad

raspberry-pi

rdp

red-pitaya

regex

rf-design

Yaesu VX-7 Technical Review

dual simultaneous receive, quad-band transmit and very compact size are three key features of the Yaesu VX-7. Let’s discuss technical characteristics.

robust-home

rst

rsync

rtl2832

RTL2832 ADS-B decoder

setup for decode, log, and display 1090 MHz ADS-B aircraft transponder data with your $20 RTL2832 USB receiver

scipy

upgrading Scipy via pip

You can install Scipy the quick way via conda, or the general way via pip. Pip install scipy requires a Fortran compiler.

scmos

sdars

security

serial-port

setup.py

signal-subspace

sirius

skype

Skype on Linux beta capabilities

Microsoft has brought Skype back to Linux via two choices, program or Chrome web browser. Here are the current capabilities of the Skype Beta for Linux relev...

smarter-commute

Uber Pool walk to pickup Boston

Uber Pool in Boston is starting to require walk to easier pickup locations. Previously Uber Pool suggested better pickup areas.

snr

soldering

spacepy

sprint

Project Fi technical aspects

Project Fi uses three LTE carriers plus VPN WiFi. Here are some practical details on how the Project Fi aggregating MVNO works.

spyder

ssh

subspace-estimation

sumix

suspend

svg

Convert PDF to SVG

DraftSight 2-D CAD actually outputs PDF even when EPS is selected. Convert PDF to SVG vector graphics for high resolution diagram on a webpage without downlo...

svm

t-mobile

Project Fi technical aspects

Project Fi uses three LTE carriers plus VPN WiFi. Here are some practical details on how the Project Fi aggregating MVNO works.

tablet

texstudio

themis

tincan-radar

trunked-radio

uber

Uber Pool walk to pickup Boston

Uber Pool in Boston is starting to require walk to easier pickup locations. Previously Uber Pool suggested better pickup areas.

ubiquiti

ubuntu

Install WINE 2.x in Linux

WINE 2.0 brings Office 2013 and a refreshed architecture for a higher level of compatibility with Windows applications. Here’s how to install Wine 2.x on Lin...

ulimit

Why use h5py context manager?

Using an h5py context manager helps avoid exceeding ulimit errors from too many open files. Example Python file I/O context manager, including with h5py.

usb-drive

usb-power

verizon

Project Fi technical aspects

Project Fi uses three LTE carriers plus VPN WiFi. Here are some practical details on how the Project Fi aggregating MVNO works.

virtualbox

vispy

How to install VisPy OpenGL for Python

VisPy uses PyOpenGL for beautiful, fast 3-D and 2-D plotting from Python and Numpy arrays. Here’s an easy way to setup VisPy–you don’t need a discrete GPU.

visual-studio

vnc

volte

Project Fi technical aspects

Project Fi uses three LTE carriers plus VPN WiFi. Here are some practical details on how the Project Fi aggregating MVNO works.

vpn

vx-7

Yaesu VX-7 Technical Review

dual simultaneous receive, quad-band transmit and very compact size are three key features of the Yaesu VX-7. Let’s discuss technical characteristics.

wake-on-lan

washington-dc

web-conference

wget

wifi

windows

windows-10

windows-7

windows-98

windows-subsystem-for-linux

windows-xp

wine

winetricks

Goldwave audio editor on Linux WINE

Easy install Goldwave audio editor on Linux using WINE. WINE 2.x allows Goldwave 6.x to work, while WINE 1.x allows Goldwave 5.x to work on Linux.

wsjt

WSJT-X on Ubuntu

WSJT is THE weak-signal mode, and it works great from Linux. Expert JT65/JT9 operating strategies are described.

wspr

WSJT-X on Ubuntu

WSJT is THE weak-signal mode, and it works great from Linux. Expert JT65/JT9 operating strategies are described.

x220

xbuild

xfce

xm-radio

xsane

youtube

yum

zenodo

HF Radar spectrum sharing

The thought of FMCW or DSSS radars operating at HF might initially seem frightening, but such radars are sharing HF in increasing numbers.

zyla