WR-G305i Specifications

Receiver type DDS-based dual-conversion superheterodyne with software-defined last IF stage and demodulator
Frequency range 9 kHz - 1800 MHz
(3500 MHz with optional downconverter)
(except cellular radiotelephone frequencies where required by law)
Tuning resolution 1 Hz
ISB, DSB (See Note 1.)
FMW (See Note 2.)
Image/Spurious Rejection 60 dB typ.
IP3 0 dBm @ 20kHz
MDS -135 dBm
Spurious-free Dynamic Range 90 dB
Phase noise -148 dBc/Hz @ 100 kHz
RSSI accuracy 5 dB typ.
RSSI sensitivity 1 µV
(-6dB) (See Note 3.)
AM 6 kHz
AMN 4 kHz
AMS 4 kHz
LSB, USB 2.5 kHz
CW 500 Hz
FM3 3 kHz
FM6 6 kHz
FMN 12 kHz
FMW (optional) 230 kHz
Scanning speed 60 channels/s max

(AM/SSB/CW 10dB S/N)


(See Note 4.)

Mode 0.15-500 MHz 500-1800 MHz
AM, AMS 1.7µV 1.85µV
LSB, USB 0.35µV 0.37µV
CW 0.2µV 0.25µV
FM3, FM6, FMN 0.7µV 0.8µV
FMW (optional) 2.0µV 2.0µV
Intermediate frequencies
IF1: 109.65 MHz
IF2: 12 kHz
Roofing filter 2 x 4-pole 20 kHz BW crystal filter
Frequency stability 10 ppm (0 to 60° C)
Antenna input 50 ohm (SMA connector)
Output 12 kHz IF2 output
(sound card Line Input compatible)
Form factor 2/3 length PCI card
Interface PCI 2.2 compliant
Dimensions Length: 195 mm (7.68")
(excluding mounting bracket)
Height: 99 mm (3.90")
(excluding edge connector)
Thickness: 19 mm (0.75")
(incl. components on either side)
Weight 310 g (10.9 oz)


1. The Professional Demodulator offers two additional demodulation modes, DSB and ISB.

2. The Wide-FM Option provides a separate wide-FM demodulator. The wide-FM demodulation is performed in hardware, using conventional hardware-based demodulation techniques, in order to ease the requirement of PC processing power which would otherwise be required for a signal of this bandwidth. In other words, the Wide-FM Option is an entirely separate receiver on its own right.

3. The Professional Demodulator offers continuously adjustable IF bandwidth from 100 to 15000 Hz in all narrow-band modes.The optional Wide-FM demodulator has a fixed bandwidth of 230 kHz.

4. The AM sensitivity is specified at 30% modulation for 10 dB S/N ratio. For 80% modulation, typical AM sensitivity of WR-G305i is 0.60 µV in 0.15-500 MHz range. The Professional Demodulator improves sensitivity further by making it posible to extend filter lengths, and adjust the IF bandwidth for optimum reception of the received signal: This results in a typical improvement by 2-3 dB on AM/SSB/FM and up to 10 dB on CW.

The WR-G305i receiver is truly one of the most sensitive receivers available, yet with an excellent dynamic range.

The following table illustrates the effect of the AM modulation depth and the Professional Demodulator on typical sensitivity figures:

AM Sensitivity (10 MHz, 10 dB S/N)
Demodulator 30% modulation 80% modulation
Standard 1.7 µV 0.6 µV
Professional 1.5 µV 0.45 µV


Specifications are subject to change without notice due to continuous product development and improvement.

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WR-G305i Receiver Card
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