How to operate JT65/JT9/FT8/WSPR powerful weak-signal modes on Linux. Operating strategies described.
Echolink works robustly on Android for those times you forgot to bring your radio.
How to use Raspberry Pi 2/3 easily with $15 RTL-SDR USB sticks, and Linux PCs in general.
How to record/upload raw WSPR data for science analysis, beyond just the 2-minute average SNR.
WSPR raw data in the form of audio files is highly useful for radio science analysis. Here’s how to load these files into Python.
Measuring the ionosphere with HF radar requires sensitivity to avoiding interference to critical services also using HF.
When operating digital ham radio modes remotely, it is in general best to have the digital program running on the computer directly attached to the radio–her...
Using classical equations and multiple frequency measurements, one can made an estimate of electron number density, supposing a simple one-hop ionospheric pa...
The current default WSPR 60 meter transmit frequency is out-of-band–illegal! Here’s a suggestion for proper transmit frequency.
Common defects in remote control toys/vehicles can often be easily remedied to increase maximum range.
Teardown and improvement of maximum control RF range by hacking RC car.
easy setup SVXlink Echolink server on Linux
How to use Raspberry Pi onboard PLL as advanced radio transmitter.
Why wouldn’t survivors of a world-wide or regional disaster use numerous satellites accessible with $35 walkie-talkies.
Programming 900 MHz Kenwood TK-481 / TK-981 requires Windows or DOS (Virtual Machine worked for me)–the software just does not work on Linux.
More quantitative is needed with regard to amateur radio (and commercial) band planning, especially with regard to narrowbanding.
Change serial port speed with Kenwood TS-2000, locally or remotely.
Scripts to control radio and rotor via one-line Terminal commands.
Improve wireless intercom maximum range by lowering squelch threshold.
The Wouxun dual-band 2m/220 and 2m/440 handheld radios are not perfect, but for half the price of comparable “big name” HTs are worthwhile.
Reliable Kenwood TS-2000 computer control configuration details with hamlib. You don’t need Ham Radio Deluxe.
A couple ways to use scan on 33cm 900MHz Kenwood ham radios
Progress of GMRS licensing vs. time.
ARRL wants to enact a new 33cm / 900 MHz bandplan, a good idea.
A group is proposing experiments to determine limits on HF skywave direction finding. Let’s put the SDR-IQ to some experimental use!
With software defined radio growing, it’s still nice to have a reference receiver for sanity checks and general monitoring. The Icom R-2500 dual receiver rad...
The RFSpace SDR-IQ will be useful for HF radar and ionospheric sounding experiments.
Suggested engineering college / high-school / maker projects
Enhance Kenwood TS-2000 operation, for TNC and Satellites
Numerous beneficial modifications to improve Yaesu VX-7 performance.
Longley-Rice modeling of analog ham radio repeater coverage on UHF.
detailed example of how a radio system can suffer poor performance due to initial deployment or degradations, and how they can be fixed.
Block diagram of NASA Space Shuttle audio rebroadcast for Amateur Radio
Picking a clear frequency on VHF (150 MHz) on which to frequently transmit with a high-level station can be a daunting task, one likely to create strife if c...
How to use relative level measurements for precise calculation of radio passband, vital for data transmission.
easy to build interface between PC and radio for Echolink, PSK31, WSPR, etc.
Technical review of dual simultaneous receive, quad-band transmit and very compact size Yaesu VX-7.
Verify your coverage predictions by drive testing and logging with sound card for repeatable results.
Why are so many EF Johnson 800 MHz designs from 1980s-2000s microphonic?
High solar activity benefits radio scientists and radio amateurs alike.
Some practical experiences in ham radio during Solar Cycle 23.
The streaming internet audio provided by forward-thinking AM stations allows quality license-free rebroadcasts.
As solar cycle 23 launches into huge SSN, some HF comms benefit and some suffer.
CB Radio is good for long distance mobile and base communications
Wireless phone jack extenders use powerline wire to couple FM signals on HF. What if we connected an antenna?
A great deal on a Galaxy Saturn Turbo leads to interesting repair and tuneup for future HF experiments.
Simple equipment to monitor geospace conditions.
A garage sale acquisition of a marine VHF mobile radio
For cottages, you want a CB base antenna that won’t be stolen, and will stand up to adverse weather. Why not a mobile antenna!
SSB gives a nearly 10x power advantage over AM, and better channel sharing.
A radio shack can be built on the cheap with patience. Repair items with bad power supplies with wall-wart power adapter.
Free ways to get more CB radio range via single-sideband vs. AM.
A free 23 channel CB radio leads to hours of successful antenna experiments.
Having a real Multimeter will greatly increase experimental ability.
A gift of musty old electronics books starts something wonderful.
What they don’t tell you about crystal radios is you need to be under the radio station transmitter for it to work!