Frequency Extension Option (/180)

The G313i/180 receiver features extended frequency coverage from the standard 9kHz-30MHz to 9kHz-180MHz. This makes it possible to use this receiver for narrow-band communications in the VHF range. The receiver's variable IF bandwidth makes this receiver particularly suitable for surveillance and monitoring of airband and other civilian and military communications.

External Reference Oscillator Input Option (/XR)

The G313i/XR receiver includes an additional external SMA connector, which can be used to connect an external reference oscillator for the highest possible frequency accuracy. This external oscillator can be any frequency from 8 to 20 MHz (the user specifies this frequency via software). The input is AC coupled and has an internal impedance of 150 ohm. The reference oscillator can be either sine or square wave between 100 mV to 5 V peak-to-peak.

Reference Oscillator Output Option (/RO)

The G313i/RO receiver includes an additional external SMA connector, which can be used to output the internal reference frequency. This is useful for situations when the receiver's own internal oscillator is to be used as a reference for other equipment, or, if an external reference is used, to provide this external reference to other receivers in a daisy-chain arrangement. If the receiver relies on its internal reference oscillator, this option will provide 16.384 MHz reference output. If an external oscillator is used, then the external oscillator frequency will be provided at this output. The output is DC coupled, sine-wave at HCMOS levels (i.e. approx 0.6 to 4 V peak-to-peak) with an internal impedance of 150 ohm. It can be directly connected to an external reference oscillator input of another WR-G313i receiver.

Intermediate Frequency 45 MHz Output Option (/IF4)

The G313i/IF4 receiver includes an external SMA connector, which provides a wide-band IF output of the entire 9 kHz - 30 MHz input band, up-converted to 45 MHz (i.e. 9 kHz corresponds to 45.009 MHz, 30 MHz corresponds to 75 MHz). This makes it possible for the receiver to be used as a front-end tuner for HF monitoring systems requiring the capability of digitizing the entire HF band instantaneously; or a front-end for a spectrum analyzer, taking advantage of the receiver's excellent sensitivity and low noise-floor level. This output is located at an additional SMA connector, with 50 ohm impedance and 18 dB gain (relative to the receiver's input level).

Intermediate Frequency 10.7 MHz Output Option (/IF1)

As an alternative to the previous option, the G313i/IF1 receiver provides a wide-band IF output. The difference is that this option involves an additional internal down-converter which converts the 45 MHz IF down to 10.7 MHz. This down-converter is using a separate local oscillator with 10 ppm accuracy and 10 ppm (0 - 60 deg C) stability, which is not tied to the master reference oscillator of the WR-G313i receiver. This is a wide-band output without any filtering, therefore spurious mixing products may occur. This output is located at an additional SMA connector, with 50 ohm impedance and 45 dB gain (relative to the receiver's input level).