EK890

The Rohde & Schwarz EK890 receiver is a compact device developed for monitoring and identification of VLF / HF emissions for both civil and military users, such as for COMINT (radio intelligence) applications. In the wake of the Rohde & Schwarz production the ambit is clearly professional, this is reflected not only on the characteristics but also on the robustness and repeatability of performance between different units. Suffice it to say that the operation is guaranteed starting from a temperature well below 0°C while the certification includes the passing of MIL-STD-810D environmental tests. The circuit configuration in the signal chain is analogical, internally two slots allow then the insertion of optional modules to meet specific needs of use - those wishing to purchase the EK890 take into account that apparatuses with the same abbreviation may therefore differ in functionality. This model can be controlled by the front commands or even remotely using the serial port with which it is equipped.

Among the aspects worthy of mention we find the excellent value in the IP2 and IP3 intercept parameters, reason for a linear behavior even in the presence of strong antenna signals. A low phase-noise PLL synthesizer with fast lock-time, typically 10 milliseconds. An integrated Built-In-Test (BIT) system display the results on the LCD. Wide range of memories and possibility to program scans on frequency intervals or channel sequences. Adjustable BFO and PBT functions.

The selectivity values, that is the bandwidth for the intermediate frequency filters, are dependent on the personalization of the receiver. Only two are the standard filters present in each version and correspond to 3.1 KHz for CW-SSB and 8 KHz for AM. The choice becomes however much wider considering the different options as indicated below:

The receiver can also be customized through the internal installation, in the two available slots, of modules that add functions or increase dynamic performance on the signal. Below we list the most relevant modules:

EK890 performance and practical notes :

Without doubt the R&S EK890 is a receiver with excellent performance, both functional and mechanical, as always the Rohde & Schwarz productions are distinguished. However, it is not a receiver that meets the demands of the average listener. The bandwidths also considering the model with 6 distinct filters are characterized by selectivity that highlight the lack of values of more frequent use, as can be 2.4 KHz for SSB for example. The equipment is excellent for demanding user if the type of traffic monitored is effectively served by the filters supplied. Even the front panel interface differs from what is usual, the ergonomics of the commands remain good but the layout and use requires to familiarize with the logic that led to their organization.