Cross Country Wireless SDR-4+ LF low frequency receiver...frequency range 2 kHz to 2.5 MHz
Replaced with Sentinel 4 VLF/LF/HF receiver , web page for information only
The SDR-4+ LF is a low frequency SDR receiver covering from 2 kHz to 2.5 MHz.
It has a Si570 low noise synthesised VFO, sharp band pass filtering, high linearity NXP RF bipolar amplifier and a built-in USB soundcard.
It is a development of our SDR-4+ HF/VHF general coverage receiver.
Recent development of the receiver has extended the lower frequency coverage to 2 kHz and added a switchable 350 kHz low pass filter to allow reception of natural VLF signals.
Key design features include:
Antenna isolation transformer with a 50 ohm impedance input for use with coax fed antennas
RF overload protection up to 150W for 10 seconds
Upconverter and RF amplifier using a high linearity NXP RF bipolar amplifier in the receiver front end
Switchable 350 kHz low pass filter
Built-in USB stereo soundcard
3.5mm soundcard audio output for headphone monitoring or connection to datamodes program
3.5mm IQ audio output for connection to external high sampling rate sound cards
Built in a compact aluminium case 175 x 106 x 30 mm
Frequency range: 12 kHz to 2.5 MHz
Input impedance: 50 ohms
Clipping RF level: -13 dBm
Maximum frequency display: 48 kHz internal sound card, up to 192 kHz external sound card
Minimum discernable signal: -135 dBm
Input IP3: +10 dBm (measured with two -20 dBm carriers with 20 kHz spacing at 1 MHz)
Receiver modes: Depends upon the SDR software used with the receiver
Supply voltage: 5 Volts (from USB ports)
Supply current: 320 mA (from USB ports)
Connectors: BNC female (RF in 50 ohms), two USB B ports, two 3.5mm stereo jacks
Overall dimensions: 185 mm (L) x 110 mm (W) x 38 mm (H)
The SDR-4+LF receiver no longer uses "dual use" (military/commercial) devices so it can now be sold without restriction.
The SDR-4+ LF receiver set-up FAQ sheet can be downloaded as a PDF file here .
The SDR-4+ receiver Quick Start Guide v1.6 can be downloaded as a PDF file here .
The SDR-4+ USB driver installer can be downloaded as a zip file here . The USB installer program loads a driver certificate then the driver file so that it works on the lastest versions of Windows.
The SDR-4+ setup program can be downloaded as a zip file here . This installer program stores the USB drivers in a folder C:/SDR-4+ and places the ExtIO files in the HDSDR and Winrad folders in Program Files and Program Files (x86).
This is a link to our CloudMe folder allowing the files included on the CD shipped with each receiver to be downloaded here .
The SDR program we recommend for first time users of SDR receivers is HDSDR which can be downloaded here .
Authors of SDR software programs or other radio programs can add support for the SDR-4+ to their software using the SDR-4+ interface specification.
Contact Chris Moulding, G4HYG via Email address hidden from spambots for more details.
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