Meanwhile the DiRaBox DRB 30 is a well-established product for PC-controlled shortwave
receivers and SDR platforms.
Numerous test reports show an excellent ranking.
The unit is often used especially for DRM applications as reference and for propagation
With the DRB 32 we introduce a modified concept especially for semiprofessional
applications with enhanced performance:
sensitivity of about 6dB
Switchable high intercept range (HighIP) for large signals
Further improved selectivity
Expanded interface with additional reset
12KHz standard IF output
Turn your PC into a top-class communications
What will be needed ?
The DiRaBox DRB 32 is a so-called black box
receiver under computer control which converts the RF signal to a low frequency
IF signal suitable for the PC soundcard.
A standard PC or notebook with standard soundcard is sufficient.
The processor clock rate should exceed 500 MHz and is related to the
used SDR software.
The low frequency IF output is connected to the line input of the
soundcard (3.5mm stereo jack socket).
Sound is provided by the soundcard via connected earphones or loudspeaker.
The web offers currently a handfull SDR programs, most of them are
These programs enable the demodulation of the IF signal delivered
by the DiRaBox.
They can handle all analgoue mode (AM / SSB / FM) and even the new
Computer control of the unit is provided by the rear-panel parallel
interface port (LPT) or via USB **.
Corresponding control software (WIN95/98/2000/XP) is available.
The DiRaBox Concept
The DiRaBox concept refers to the
principles of Software Defined Radio. SDR is also state-of-the-art used in professional
First conversion to a high IF-frequency and second conversion to a very low IF-frequency
followed by DSP (Digital Signal Processing). In the DiRaBox concept DSP is replaced
by the combination PC and SDR software.
Software Defined Radio (SDR) is a radio system which replaces as much as possible
functional blocks by software technologies that enable reconfigurable system architectures.
Benefits of SDR
Easy implemantation of future
transmission & modulation standards
Any filter configuration possible
Integration of useful auxiliary
functions like e.g. noise reduction
High reproductibility by omission
of analogue components with relating tolerances
This makes is quite clear that a
flexible system like SDR is superior to a rigid system, right now when transmission
technolgy is changing from analogue to digital.
Tuning Frequency: 30KHz - 30MHz (continous)
Tuning Steps: 1/5/10/50/100/500Hz & 1/5KHz selectable
Antenna Jacket / Impedance: BNC-socket / 50Ohms & additional remote supply
voltage 9V via 470 Ohms serial resistor
for an optional active antenna (switchable)
Max. Allowed Antenna Level : +10dBm typ. / saturation at -15dBm typ.
Noise Floor (0.15-30MHz BW 2.3KHz):
Standard: < -131dBm (0.06µV) typ.
HighIP: < -119dBm (0.25µV) typ.
Intermodulation-free Dynamic Range
Standard: > 97dB typ.
HighIP: > 95dB typ.
In-Band-Blocking: > 88dB typ.
(20KHz offset / interence signal -33dBm & desired signal -121dBm=S1)
Third-order Intercept Point IP3 (@7.00 & 7.20MHz):
Standard: +14dBm typ.
HighIP: +24dBm typ.
Frequency Stability (15min. warm-up period): +/- 1ppm typ.
DRM-Performance (9/10KHz): Max. SNR >35dB, PREMIUM >40dB *
DDS-related Spurious Supression: > 70dB typ.
Image Frequency Rejection:
>65dB / 1.IF (LO + 45MHz)
Standard: >57dB / 2.IF (In-Band -24KHz)
Premium: >70dB / 2.IF (In-Band -24KHz)
IF Suppression: > 85dB
12KHz-IF Output: Bandwidth 15KHz (-6dB) via 3.5mm stereo phone jack socket
PC Control Port / LPT: D-SUB (25-pin SUB-D male connector ) **
Power Supply / Connector: 12 - 15V DC max. 200mA / 2.1mm DC power socket (positive
Operating Temperature: 0 - 40°C
Dimensions / Weight: 112 x 71 x 31mm / 0.15kg
What`s included ?
DiRaBox DRB 32
Please note: Plug-Power Supply, application
software (Control Panel) and connecting cables are not included !
Application software is available
directly from this page. Also available as CD-ROM on request.
Selected DRB 32 PREMIUM with DRM-SNR >40dB guaranteed
(tested with 9KHz-DRM signal at 10MHz & -45dBm)
for availability !
DRB USB ADP USB Interface
Adapter (plugable to the DiRaBox parallel port connector)
With the DiRaWave 032
we introduce the third generation of PC-controlled shortwave receivers from own
development and production.
An extremely low noise floor of -137dBm
in association with an oustanding intermodulation-free dynamic range of >102dB
combines perfectly maximum sensitivity with excellent strong signal handling.