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FM stereo transmitter
Reader [Mike Y] responded to our “What are you working on?” post with his stereo FM transmitter project. If you’ve ever used an FM transmitter for your portable audio, you know that even the best...
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RF modem + 250mW amplifier
[Trax] sent in his writeup on this RF modem with built in 250mW amplifier. The original power of the RF transceiver was around 10mW, his final results after testing were nearly 250mW. He was able to...
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Designing an RF transceiver
[William Dillon] is finishing up his degree. His final project as a student was to design an RF transceiver. He decided to work with the Microchip MRF49XA, which runs around $3 but will cost you $20...
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Designing a Smarter RF transceiver
Two months ago we featured a transceiver based on the Microchip MRF49XA, and a lot of feedback was sent to [hpux735] requesting that some brains be added onto the system. [hpux735] decided that if he...
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Open source software defined radio transceiver
As the year draws to a close, we must look back and look at the advances in amateur radio this year. The RTL-SDR tuner hack, a USB TV Tuner to create a software defined radio receiver, is one of the...
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Retrotechtacular: Teleprinter Tour, Teardown
This week, we’re taking the wayback machine to 1940 for an informative, fast-paced look at the teleprinter. At the telegram office’s counter, [Mary] recites her well-wishes to the clerk. He fills out a...
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Speaking CAN With Open Source Hardware
You can buy a dongle with a weird industrial connector that fits under the dash of any car on the road for $15. This is just a simple ODB-II transceiver meant for reading error codes and turning a...
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HamShield Puts Your Arduino On The Radio
Anybody can grab a USB TV tuner card and start monitoring the airwaves, but to get into the real meat of radio you’ll need your amateur radio license. Once you have that, the bandwidth really opens up…...
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How CMOS Works: Some Final Words About CMOS
Finishing up on the topic of CMOS bus logic I am going to show a couple of families with unique properties that may come in handy one day. High Voltage Tolerant Family: AHC/AHCT Note the missing diode...
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The Minima Is An All-Band HF Transceiver For Under $100
If you have ever browsed an amateur radio magazine you could be forgiven for receiving the impression that it is a pursuit exclusively for the wealthy. Wall-to-wall adverts for very large and shiny...
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The BITX Transceiver Comes Of Age
There was a time when the idea of building your own single-sideband transceiver was too daunting for all but the most hardcore of amateur radio constructors. After all the process of creating SSB is...
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Measuring Spurious Emissions of Cheap Handheld Transceivers
If you buy an amateur transceiver cheap enough to make a reasonable grab bag gift or stocking stuffer, you get what you pay for. And if this extensive analysis of cheap radios is any indication, you...
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Wireless Nunchuck R/C Remote!
[Dan], admirably rose to the occasion when his son wanted a new toy. Being a dedicated father — and instead of buying something new — he took the opportunity to abscond to his workbench to convert a...
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Hackaday Prize Entry: Open Narrowband RF Transceiver
We have so many options when we wish to add wireless control to our devices, as technology has delivered a stream of inexpensive devices and breakout boards for our experimentation. A few dollars will...
View ArticleA Watch Only A Ham Can Use
We’re not sure what to make of this one. With the variety of smartwatches and fitness trackers out there, we can’t be surprised by what sort of hardware ends up strapped to wrists these days. So a...
View ArticleAn SSB Transceiver On Only One Type of Transistor
There are a multiplicity of transmission modes both new and old at the disposal of a radio amateur, but the leader of the pack is still single-sideband or SSB. An SSB transmitter emits the barest...
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An FM Transceiver From An Unexpected Chip
The Si47xx series of integrated circuits from Silicon Labs is a fascinating series of consumer broadcast radio products, chips that apply SDR technologies to deliver a range of functions that were once...
View ArticleBuy A Baofeng While You Still Can? FCC Scowls at Unauthorized Frequency...
There was a time when a handheld radio transceiver was an object of wonder, and a significant item for any radio amateur to own. A few hundred dollars secured you an FM walkie-talkie through which you...
View ArticleEBay Modules And Custom PCBs Make A Plug And Play Ham Transceiver
Many of us have fond memories of our introduction to electronics through the “200-in-1” sets that Radio Shack once sold, or even the more recent “Snap Circuits”-style kits. Most of eventually us move...
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An SDR Transceiver The Old-School Way
Software-defined radios or SDRs have provided a step-change in the way we use radio. From your FM broadcast receiver which very likely now has single-application SDR technology embedded in a chip...
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