Rohde Schwarz FSH-3 Spectrum Analyzer
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The FSH-3 is a small portable fully-featured professional spectrum analyzer, developed by Rohde & Schwarz in Germany [1] around 2005. It can be used for fault finding, field maintenance, e.g. on mobile radio stations, and monitoring of the radio spectrum. Furthermore, the FSH-3 can be used for location of (intermittent) interferences and even for locating hidden transmitters (bugs).
The FSH-3 with batterwy like Tektronix Battery, Rohde Schwarz EB200 Battery, Rohde Schwarz FSH8 Battery, Rohde Schwarz FSH4 Battery, Rohde Schwarz HA-Z204 Battery, Rohde Schwarz Battery, Anritsu 633-75 Battery, Yokogawa AQ7270 Battery, Yokogawa AQ7275 Battery, Yokogawa Battery, NetTEST CMA4000i Battery, NetTEST CMA8800 Battery covers a frequency range from 100 kHz to 3 GHz and has a resolution bandwith of 100 Hz to 1 MHz. It can be powered by an external mains adapter or by the built-in rechargable batteries. With the built-in tracking generator, the FSH-3 can be used to measure the properties of filter networks and amplifiers.
All controls are at the front panel, directly below the full-colour display. The connectors for RF in, RF out (tracking generator) and optional Power Sensor are all at the rear, just above the grip. At the left, hidden in the grip is a 3.5 mm jack socket for connecting a pair of headphones.
Rohde & Schwarz was among the first manufacturers to introduce portable spectrum analyzers and the FSH-3 belongs to their earliest developments. Other members of the the family are the FSH-6 (no longer available) and the FSH-18. The latter has a frequency range of 10 MHz to 18 GHz and a resolution bandwidth of 100 Hz to 1 MHz. The FSH-3 and FSH-18 were succeeded by the FSH-range of spectrum analyzers and related products like the PR-100 Portable Receiver.
The easiest and most reliable way to interface a computer with the FSH-3 is via an RS232 interface. A suitable cable, that converts the optical port into a bi-directional serial RS232 port, is supplied with the device.
The serial port can be used to transfer data from the FSH-3 to the PC but also to remote control the FSH-3 from the PC.
As most modern desktop computers and laptops are no longer supplied with a serial RS232 port, an suitable USB converter is available as well. It basically contains a built-in converter from RS232 to USB and makes the device appear as a COM-port on the PC.
A suitable driver for this interface should be installed on the PC, and is supplied on the enclosed CD-ROM.
In order to print images (screen dumps) directly from the FSH-3, an external parallel converter is available. It converts the optical port into a Centronics-compatible printer port.
A parallel printer can be connected to the 25-way D-type connector on the interface.
A thin light-weight pair of Sennheiser PX-30 headphones is included with the FSH-3. It should be connected to the Phones socket at the left side of the carrying grip and can be used to listed to the demodulated audio of an intercepted RF signal.
The FSH-3 can be powered for approx. 4 hours by the internal rechargable NiMH batteries, but also by the included mains adapter. When the FSH-3 is connected to the mains, the internal batteries are automatically recharged.
The main adapter is suitable for virtually any mains wall socket in the world. Suitable wall socket pins are included with the adapter and by we swapped in seconds.
A quick reference manual is supplied with the FSH-3. It is small enough to be stored with the device and describes the most common functions of the analyzer.
A more comprehensive Operator's Manual can be found on the supplied CD-ROM.