Rohde & Schwarz direction finders for land-based, airborne, or shipboard detect any signal from 300 kHz to 3 GHz in practically no time.

-ADC2 and R&S® DDF255-WB options additionally 40 MHz and 80 MHz Scan speed with R&S® DDF255-PS option up to 270 GHz/s (in-band)   with R&S® DDF255-ADC2, R&S® DDF255-WB and R&S® DDF255-PS options up to 850 GHz/s (in-band)  Minimum signal duration VHF/UHF/SHF 1 ms   HF 2 ms1) Depends on DF antenna.2) Measurement in reflection-free environment.

The R&S®DDF255 combines the extremely powerful R&S®ESMD wideband monitoring receiver with the accurate correlative interferometer DF method. This combination yields a high-precision wideband direction finder featuring extensive measurement and analysis functions. With its high integration density and optional DC power supply, the R&S®DDF255 is also ideal for mobile applications.

This application brochure describes the sophisticated digital signal processing implemented in all modern Rohde&Schwarz receivers. The implementation is optimized for applications such as detecting unknown signals, identifying interference, spectrum monitoring, spectrum clearance, signal search over wide frequency ranges, producing signal content and direction finding of identified signals. The advantages of digital signal processing for radiomonitoring operators in their daily work are also explained.

English (PD 3607.0198.62)

Overview Key FactsWhen equipped with theR&S®DDF255-PS option, the R&S®DDF255 traverses a user-defined frequency range at maximum speed (without direction finding). This provides a quick overview of the spectrum occupancy. Any changes caused by illegal radio services, interference sources, temporary emissions, etc., can thus be recognized immediately.

For instance, the R&S®DDF255 can be directly connected to a vehicle's power supply system when equipped with the R&S®DDF255-DC option.

Overview Key Facts Frequency and frequency offset in line with ITU-R SM.377 Field strength in line with ITU-R SM.378 Modulation in line with ITU-R SM.328 Key FactsThe R&S®DDF255-IM option expands the R&S®DDF255 to offer a comprehensive range of ITU-compliant measurement methods.

Overview Key FactsThe R&S®DDF255-SL option allows the decoding of diverse selective call methods and the demodulation of pagers.The following selective call methods are supported: CCIR1, CCIR7, CCITT, EEA, EIA, EURO, DCS, DTMF, CTCSS, NATEL, VDEW, ZVEI1, ZVEI2. Other methods are available on request.

Overview Key FactsThe R&S®DDF255-COR option enables the R&S®DDF255 to correct errors through the use of comparison tables.Especially in mobile DF applications, DF accuracy is often degraded due to vehicle reflections. By applying appropriate error correction, the DF accuracy can be significantly improved.

Overview Key FactsThe R&S®DDF255-HF option extends the frequency range of the R&S®DDF255 downward. The lower frequency limit depends on the operating mode: DF mode: 300 kHz Receive mode: 9 kHz Key FactsThe R&S®DDF255-HF option extends the frequency range of the R&S®DDF255 downward.

Overview Key FactsThe R&S®DDF255-SHF option extends the frequency range of the R&S®DDF255 upward. The upper frequency limit depends on the operating mode: DF mode: 6 GHz Receive mode: 26.5 GHz Key FactsThe R&S®DDF255-SHF option extends the frequency range of the R&S®DDF255 upward.

The DF function of the R&S®ESMD fully corresponds to that of the R&S®DDF255 digital direction finder. Key FactsWhen equipped with the direction finder upgrade kit, the R&S®ESMD can take the bearings of all signals in a wide frequency range of up to 20 MHz with a selectable resolution. The DF function of the R&S®ESMD fully corresponds to that of the R&S®DDF255 digital direction finder.

, R&S® DDF19x, R&S® DDF205, R&S® DDF550 Specifications The R&S® RA-CM continuous monitoring software currently supports the following devices/components: Digital direction finders R&S® DDF0xA/E, R&S® DDF39x, R&S® DDF0xM, R&S® DDF04E, R&S® DDF255, R&S® DDF19x, R&S® DDF205, R&S® DDF550 R&S® AMMOS GX400 R&S® GX400VC, R&S® GX400VD, R&S® EM010, R&S® EM050, R&S® AMMOS® GX401BP, R&S® AMMOS® GX405BP, R

Additionally, the R&S®GX460 can be configured with the following: 10[[mbsp]]Gbit Ethernet (either electrical or optical), data transfer for the R&S®ESMD or R&S®DDF255; the maximum data transfer is sufficient to handle scenarios with up to 40 MHz bandwidth, see table "Interface with products from ".The R&S®GX460 is controlled via the 1 Gbit Ethernet interface.

Compact DF antenna from 600 MHz to 6 GHz with vertical polarization, entirely passive from 600 MHz to 2.9 GHz

figure of 14 dB with an SOI point of more than 60 dBmKey factsConversion frequency range from 18 GHz to 40 GHz2 GHz conversion bandwidthOptimum RF performance through extensive preselection filters, offering a noise figure of 14 dB with an SOI point of more than 60 dBmExceptionally low phase noise of less than –94 dBcCompact size of only ½ 19" (3 HU)Plug & play capability with R&S®ESMD, R&S®ESME, R&S®DDF255

R&S®ESME/ESMD/EB510/EB500/DDF260/DDF255/DDF205)Open interface for independent extension of signal processing capabilities by the userManual signal measurement in line with ITU-R SM.1600Signal recording and replaying to/from hard diskBrief descriptionR&S®CA100 is a standalone software solution for analysis, classification, demodulation and decoding of digital and analog IF signals.

&S® ADD107, R&S® ADD207 approx. 6 kg Operating temperature range   0 °C to +50 °C Storage temperature range   –20 °C to +60 °C Power supply AC, with external power supply unit, DC 100 V to 240 V AC, 50 / 60 Hz, 1 A 20 V to 30 V DC, 4 A 24 V DC (nom.)1) In addition, R&S®Mobile Locator with R&S®MapView instead of the web-based GUI, can be used with all direction finders such as the R&S®DDF205, R&S®DDF255

Additionally, the R&S®GX465 can be used with 10 Gbit Ethernet (either electrical or optical), data transfer for the R&S®ESMD wideband monitoring receiver or the R&S®DDF255 digital direction finder. The maximum data transfer is sufficient to handle scenarios with up to 80 MHz bandwidth.The R&S®GX465 is controlled via the 1 Gbit Ethernet interface.

This is a discontinued product Please note the following successor product(s):R&S®DDF255 Digital Direction FinderR&S®DDF205 Digital Direction FinderOverview OptionsKey Facts Direction finding of signals with almost any modulation Wide-aperture behaviour above 300 MHz Very short signals of 10 ms detectable Key FactsDirection finding of signals with almost any modulationWide-aperture behaviour above

The R&S®ADDx DF antennas are decisive for the high efficiency of the Rohde & Schwarz single-channel direction finders because they offer unique technical innovations. The wide product range covers stationary, transportable and mobile applications. In development, the focus was on the lightning protection concept of the antennas and their immunity to harsh ambient conditions.

English (PD 3606.7647.12)

The National Communications Commission (NCC) of Taiwan operates an extensive spectrum monitoring system from Rohde & Schwarz.

R&S®ADDx compact single-channel DF antennas are decisive for the performance of the Rohde & Schwarz direction finders. The technology is based on more than 50 years of experience in the development of DF antennas and, despite their compact size, they offer superior sensitivity and accuracy from 20 MHz to 6 GHz.

The R&S®MC40 extends the frequency range of modern 18 GHz to 40 GHz monitoring systems. With a 2 GHz conversion bandwidth, it is a future-ready investment to meet the requirements of tomorrow’s signal environments. The small form factor and the open SCPI interface support easy integration into any existing system.

09-Jan-2019 | Press Release | Security

The spectrum monitoring solution from Rohde & Schwarz convinced the Taiwanese National Communications Commission (NCC). The Rohde & Schwarz system scored with an integrated hybrid geolocation method that combines angle of arrival (AoA) and time difference of arrival (TDOA) measurements. This allows the NCC regulatory authority to locate sources of interference in the radio spectrum quickly and efficiently, even in dense urban environments. For this and other reasons, the Rohde & Schwarz technology group clearly prevailed against competitors for the first time in Taiwan.

English (PD 3607.1271.12)

R&S®CA100 is a standalone software solution for analysis, classification, demodulation and decoding of digital and analog IF signals. The software provides powerful signal analysis and signal processing functions and runs on a Windows PC. If connected to modern Rohde & Schwarz monitoring receivers with internal digital downconverters (DDC), e.g. R&S®ESME or R&S®ESMD, up to four signals can be processed in parallel.

Monitoring receivers must meet certain requirements to be used in a TDOA-based radiolocation system. This application brochure describes these requirements as well as other parameters that are of interest when selecting sensors.