At 8.5 kg, the U3661 is the world’s lightest microwave spectrum analyzer, meeting the diverse needs of a wide range of communication systems.

The U3661 not only enhances the basic performance of a spectrum analyzer, but also includes many standard features such as power calculation and high-speed scanning.

The U3661’s compact, lightweight design and three-way power supply system, including batteries, make it the perfect analyzer for field measurements.

The unit also has a built-in RC232 interface for connection to a personal computer, facilitating flexible data management using standard memory cards.

Excellent basic performance and measurement applications

Wideband scanning

The U3661 can continuously scan a frequency bandwidth from 9 kHz to 26.5 GHz on a single screen. Harmonic measurements or spurious signal measurements over a wide bandwidth can be easily compared relative to the fundamental.

Outstanding signal purity

The U3661’s local oscillator is equipped with a precision synthesizer that achieves a signal purity of -100 dBc/Hz (at frequencies ≤3.2 GHz and an offset frequency of 10 kHz). It meets a variety of needs, from adjacent channel leakage power measurements at radio facilities to microwave equipment evaluation.

Occupied frequency bandwidth

The U3661 calculates the bandwidth for a specified power ratio based on the measured spectrum data and then displays it with a marker. In addition, it displays the occupied frequency bandwidth (OBW) and carrier frequency (FC).

Adjacent Channel Leakage Power

The U3661 obtains the total power from the measurement data on the screen. It then integrates the www.abb-drive.com power over the specified bandwidth (BS) to obtain its ratio to the total power.

ACP POINT and ACP GRAPH measurement methods can be selected.

Various Measurement Applications Power Measurement Functions

Average power

Digital mobile communication systems use modulation patterns that can handle signals with large amplitude variations.

Therefore, we have included an average power calculation function that allows power measurement of signals with amplitude variations.

Total Power

For spread spectrum signals used in CDMA or wireless LANs, the total power measurement function is essential. This function consists of two modes: a channel mode for measuring the in-band power specified in the measurement window, and a total power mode for measuring the total power over the entire measurement span.

1 Hz resolution frequency counter

Simply by adjusting the counter markers according to the spectrum, the U3661 can display a frequency counter with a minimum resolution of 1 Hz. This feature is very useful in multicarrier frequency measurements such as mobile radio or CATV systems, where it is difficult to do so with conventional frequency counters.

Multiple Markers

Up to six markers can be set up on a single screen, and a corresponding marker can be assigned to any frequency. The multi-tag function automatically detects peaks and displays a list of frequencies sorted by level or frequency.

The U3661 allows channels to be set for communication systems in major countries.

Most communication systems utilize the FDMA (Frequency Division Multiple Access) method. When observing signals with the U3661. each carrier band to be measured can be registered in the built-in table as a user channel. This makes it possible to call the center frequency by the channel number, thus improving efficiency.

Channel numbers from 1 to 99 can be registered, and two tables are provided. For TV broadcast waves, frequencies can be preset according to the VHF, UHF, CATV BS and CS band names of major countries.

If the CMDA option (OPT 60) is added to the U3661. the CDMA transmission characteristics specified in the IS-95 and J-STD-008 standards can be measured in a single operation.

Functional Features

– Automatic internal setting of CDMA parameters

– Frequency adjustment settings by channel number

– High-stability CDMA channel power measurement function

– High-sensitivity power measurement with built-in preamplifier

Measurement items

– Channel power measurement

– OBW measurement

– ACP (Spectrum Mask) Measurement

– Spurious emission (in-band) measurement