New speculative-execution vulnerability strikes AMD, ARM, and Intel
Fortunately, existing fixes should provide the protection we need. Continue reading New speculative-execution vulnerability strikes AMD, ARM, and Intel
Category Archives: ssb
An SSB Transceiver Using Only One Device? Surely not!
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 minimum of RF spectrum required to reconstitute an audio signal, only half of the mixer product between the audio and the RF carrier, and with the carrier removed. This makes SSB the most efficient of the analog voice modes, but at the expense of a complex piece of circuitry to generate it by analog means. Nevertheless, radio amateurs have produced some elegant designs for SSB …read more
Continue reading An SSB Transceiver Using Only One Device? Surely not!
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 complex enough in itself without adding the extra complexity of a receiver and the associated switching circuitry.
In 2003 an Indian radio amateur, [Ashhar Farhan], [VU2ESE] changed all that. His BitX SSB transceiver used a bidirectional amplifier design and readily available components such that it could be built by almost anyone using dead bug construction techniques for an extremely reasonable price.
Over the years since [Ashhar] …read more
