RDR55

The RDR55 is a modular receiver (also transceiver with the RPA5C module) controlled through the touch screen. It can be adapted to many operating conditions thanks to its exchangeable modules, the full metal aluminum housing enables extensive shielding too. The main RAD18E front-end module provides four 16-bit ADC chips for an 18-bit RF data stream. From 1 kHz up to 30 MHz a continuous reception is possible (31 MHz low-pass filter), the 6 meter band of 50~54 MHz is filtered with an LC filter, 3 meter FM and extended 2 meter amateur radio band (up to 150 MHz without attenuation, to 154 MHz with increasing attenuation) are filtered with multi-pole SAW filters. This module achieves very high sensitivity and intermodulation immunity. Signals with double sideband modulation, single sideband, with or without a carrier, keyed signals (CW) as well as FM signals can be received. The receiver bandwidth and gain are adjustable within a wide range, either with a manual gain or via the configurable automatic gain control.

The RDR55 is based on digital signal processing representing an enhanced Software Defined Radio (SDR) approach. After digitization of the received signal a conversion is done from the time domain into the frequency domain using fast proprietary algorithms (no FFT). The result is a spectrum of 163.84 kHz width cut-out with a selectable frequency resolution. Additional signal processing is performed then in the frequency domain, except for FM.

The receiver architecture consists of a base mainframe unit with plug-in modules which are easily replaceable. All major software components are upgradeable via the USB interface, as well as all the hardware configurations used in the programmable circuits (FPGA). Connection to an Ethernet network is possible using an optional module.

RDR55 features :

• Dynamic range of signal processing: at least 36 bit linear range, 18~32 bit audio and dB-converted signals range.

• DNR Noise reduction system: with 2 algorithms. IQ process and magnitude method.

• Level of accuracy: < 1 dB without filter, 1~2 dB with automatic RF Filter.

• Gain control range: 140 dB in 0.5 dB steps, manual and automatic.

• Resolution time-frequency conversion: 2.5~320 Hz in 8 steps.

• Spectral resolution on x-axis (frequency): from 2.5 Hz min.

• Spectral resolution on y-axis (level): from 0.05 to 0.5 dB/line, dBuV or dBm scale, 2 markers, S-level display with 0.1S resolution.

• Video spectral filters: OFF, arithmetic average, quasi-peak, maximum hold at 0~9.9s, or infinite measurement time.

• Antenna high-pass filter: into the signal path of "ANT1" a coupling capacitor to increase the lower limit frequency to about 75 kHz can be switched on.

• External synchronization: about ±100 ppm at 0 dBm external oscillator level.

RDR55 price

We have collected for your convenience the K&M RDR55 sale price (US Dollar) and its trend over time. Useful to guarantee a cheaper purchase of this radio and to put it for sale in the second-hand market. Of course offers, accessories, warranty terms and conditions can lead to different figures.

Price	Date	Condition
USD 4699.00 (3990EUR)	2021-oct	Brand-new Order designation RDR55E2 with module RAD17E and RDR35D. RAD17E: 16 bit ADC (2 x 16 bit ADC units, max 71 MHz). RDR35D: DSP module with t/f converter of 2.5 Hz frequency resolution, GPS, WiFi, Bluetooth.
USD 5300.00 (4500EUR)	2021-oct	Brand-new Order designation RDR55E1 with module RAD18E and RDR35D. RAD18E: 18 bit ADC (4 x 16 bit ADC units), automatic 2-channel preselector on MW / SW, FM, 2m (130-156 MHz), DAB +. RDR35D: DSP module with t/f converter of 2.5 Hz frequency resolution, GPS, WiFi, Bluetooth.
USD 4677.00 (3990EUR)	2018-dec	Brand-new Order designation RDR55E2 with module RAD17E and RDR35D
USD 5275.00 (4500EUR)	2018-dec	Brand-new Order designation RDR55E1 with module RAD18E and RDR35D