The R&S FSL is an extremely lightweight and compact spectrum analyzer that is ideal for a large number of applications in development, service and production. Despite its compact size, it offers a wealth of functions more typical of the high-end range, thus ensuring an excellent price/ performance ratio. The ?FSL is the only instrument in its class that features a tracking generator up to 6 GHz and can I/Q-demodulate signals with a bandwidth of 20 MH. With phase noise of typ. ?103 dBc (1 Hz) at 10 kHz from the carrier, a third order intercept point of typ. +15 dBm, a bandwidth range from 10 Hz to 10 MHz, and a displayed average noise level (DANL) of ?152 dBm, the ?FSL compares favorably with high-end analyzers. This makes it very useful in production, service, field use and in labs. The RF attenuator, which is adjustable in steps of 5 dB, and the optional preamplifier ensure an optimum usable dynamic range.