Tuesday, December 30, 2008
QEX: A Software Defined Radio for the Masses, Part 4
It has been a pleasure to receive feedback from so many QEX readers that they have been inspired to experiment with software-defined radios (SDRs) through this article series. SDRs truly offer opportunities to reinvigorate experimentation in the service and attract new blood from the ranks of future generations of computer-literate young people.1 It is encouraging to learn that many readers see the opportunity to return to a love of experimentation left behind because of the complexity of modern hardware. With SDRs, the opportunity again exists for the experimenter to achieve results that exceed the performance of existing commercial equipment.
Most respondents indicated an interest in gaining access to a complete SDR hardware solution on which they can experiment in software. Based on this feedback, I have decided to offer the SDR-1000 transceiver described in this article as a semi-assembled, three-board set. The SDR-1000 software will also be made available in open-source form along with support for the GNU Radio project on Linux.2 Table 1 outlines preliminary specifications for the SDR-1000 transceiver. I expect to have the hardware available by the time this article is in print.
More at http://www.arrl.org/tis/info/pdf/030304qex020.pdf
Monday, December 29, 2008
Sunday, December 21, 2008
SolderSmoke 97
DSB 80 "Kickpanel" project:
Rig reform
Harder than SSB?
Do we need to match diodes?
Terminating balanced modulators
An antenna for my "spot" ("net") circuit, LED
Thinking of speech processing
Driver hotter than final
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MEPT QRSS:
VK2ZAY crosses Oz on 470 micro-watts
Using 9H1LO's grabber engine as time machine
My beacon box: 10 and 30 in same enclosure
Knights QSY to lower bands (temporarily)
---------------
Theory:
Thanks for beta independence help
Why does feedback lower distortion?
W3JDR's Ne602 modeling
Grinding resistors for precision
Broken counter leads to learning logic
Get it at http://www.soldersmoke.com/soldersmoke97.mp3
Thursday, December 18, 2008
Southgate ARC: New Zealand scraps ban on traditional lightbulbs
The standard low cost, low pollution incandescent light bulb had been banned in New Zealand but on Wednesday the NZ Goverment announced an end to the ban.
There have been concerns raised around the world about the high-energy costs involved in manufacturing so called "energy efficient" light bulbs along with the potential risks resulting from the use of the toxin Mercury in such bulbs.
The pollution of the Radio Frequency spectrum by so called "energy efficient" light bulbs, which deprives people of their radio programmes, has been raised in UK national newspapers. Traditional incandescent bulbs do not cause RF pollution.
More at http://www.southgatearc.org/news/december2008/nz_scraps_lightbulb_ban.htm
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