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In a similar vein, Sun Maid ships more raisins than Sunkist ships oranges. Just as you can argue that both NAND and NOR are flash, you can argue that oranges and raisins are both fruit,” he wrote in the report. The two technologies have very little in common. Semico has steadfastly argued that NAND and NOR are as dissimilar as SRAM and DRAM, and the world seems to finally be coming around to this way of thinking. To take it to the extreme, if we count total memory shipments, then Samsung has been ahead of Intel for years!”

EJH-110-01-F-D-RA-04_Datasheet PDF

In a similar vein, Sun Maid ships more raisins than Sunkist ships oranges. Just as you can argue that both NAND and NOR are flash, you can argue that oranges and raisins are both fruit,” he wrote in the report. The two technologies have very little in common. Semico has steadfastly argued that NAND and NOR are as dissimilar as SRAM and DRAM, and the world seems to finally be coming around to this way of thinking. To take it to the extreme, if we count total memory shipments, then Samsung has been ahead of Intel for years!”

This kind of test instrument will be increasingly important as position-aware so-called E911 cellphones proliferate. However, the need for GPS jamming susceptibility is equally important in other arenas as well, such as avionics and automotive navigation.

RTCA Who?

EJH-110-01-F-D-RA-04_Datasheet PDF

In its press statement on the left, Noise Com mentions that the GPS7500 meets RTCA standards, but it doesn't define what that acronym stands for, nor does it say who the RTCA is.

Organized back in 1935, it's the Radio Technical Commission for Aeronautics. Nowadays, RTCA includes more than 250 government, industry, and academic organizations. As a private, not-for-profit corporation, it develops consensus-based recommendations regarding communications, navigation, surveillance, and air traffic management. RTCA also functions as a Federal Advisory Committee, with its recommendations heeded by the Federal Aviation Administration.

Modular and PC-Equipped

EJH-110-01-F-D-RA-04_Datasheet PDF

Back to the GPS7500 instrument. For starters, I think one of the best aspects of this test set is that it's modular and includes a standard PC architecture and operating system.

You can expand or modify a GPS7500's configuration as needed, and its modularity helps make it future-proof. The system runs an embedded Intel Pentium with Microsoft Windows XP, and drives an 8.4-inch TFT (thin film transistor) color LCD so that you get nice, crisp high-res images. Here's a typical display image, this one showing interference level vs. interference bandwidth.

EJH-110-01-F-D-RA-04_Datasheet PDF

Click for larger TFT screen image

The PC subsystem also includes hooks for optional Ethernet and IEEE-488 GPIB communications. The GPS7500 hardware also includes a reference input jack so that you can use an external 10-MHz reference if you so desire. Internal/external operation is software selectable.

Applying a serial resistor RSER to the resonance circuit can reduce the division factor dc.

Reader antenna quality factor

Practical antenna circuit Q factors, in case full receiver chain is used, can be found between 10 and 15. Introducing a serial resistor RSER, will limit the high voltage by reducing the overall quality factor, without reducing reading distance. In other words, the resonance circuit quality factor Q can be reduced by adding a serial resistor RSER.

Reduced Q also improves recovery time after modulation, which is especially important for transponders with data rates at 32 and 40 periods per bit. Furthermore a lower antenna current will limit the junction temperature of the chip.

The following calculations are based on a serial resistor of

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