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Antenna Compendium Volume 1 by American Radio Relay League

By American Radio Relay League

The most excellent quantity in ARRL's well known Antenna Compendium sequence comprises articles on a multiband moveable, quads and loops, baluns, the Smith Chart, and extra.

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Unfortunately, since SDR was not used for older receivers, they cannot process new signals. While incompatibility with new waveforms is irrelevant for a one-dollar radio, it is quite inconvenient for a $400 car stereo. E. 1007/978-1-4419-9332-8_4, Ó Springer Science+Business Media New York 2013 37 38 4 Disadvantages of SDR The second most common argument against SDR is increased power consumption. Two sources contribute to higher power consumption in an SDR: increased DSP complexity and higher mixed-signal/RF bandwidth.

Thus, antifuse FPGAs can be programmed only once. Antifuse-based FPGAs are therefore not suitable for SDR implementation because the functionality cannot be changed. Once programmed, they should be considered ASICs. 7 Antifuse FPGAs are used almost exclusively by the aerospace industry because of high radiation tolerance. The only antifuse FPGA vendor is Actel [42]. To the best of the author’s knowledge, only SRAM-based FPGAs have been used to implement SDRs for both terrestrial and space8 use.

2, the SNR was set to 18 dB and ACM was not enabled. The modulation remained at 16 QAM, which caused more than 50 % of the packets to be lost, resulting in data rate of 344 kbps and frame rate of 10 fps. 4 and the video was garbled. 3 and the modulation automatically switched to QPSK. 8 fps. However, now the bandwidth of the channel was reduced by 50 % and thus a lot of packets were dropped, resulting in video quality that was still very poor as indicated by a VQI of 51. 3, note that the average frame size is halved) improved VQI to 89.

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