MOD04-$249.95 Frequency Extension Option (G313/180)
 

The G313/180 option extends the frequency coverage from the standard 9kHz-30MHz to 9kHz-180MHz. This makes it possible to use this receiver for narrow-band communications in the low VHF range. The receiver's variable IF bandwidth makes this receiver particularly suitable for surveillance and monitoring of civilian and military aircraft and marine communications.

MOD05-$199.95 External Reference Oscillator Option (G313/XR)
 

The G313/ER option adds an external SMA connector to the receiver board, 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).

MOD06-$149.95 Reference Oscillator Output Option (G313/RO)

The G313/RO option adds an external SMA connector to the receiver board, 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 at an additional SMA connector, 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.

MOD07-$249.95 Intermediate Frequency Output Option 10.7 MHz (G313/IF1)
 

Similar to the previous option, the G313/IF1 option provides a wide-band IF output. The difference is that this option involves an additional down-converter which converts the 45 MHz IF down to 10.7 MHz.

MOD08-$199.95 Intermediate Frequency Output Option 45 MHz (G313/IF4)
 

The G313/IF4 option adds an external SMA connector to the receiver board, which provides a wide-band IF output of the entire 9kHz-30MHz 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.

To order a receiver with any of the above options, simply add the option code(s) to the receiver model number. For example, for a 180MHz receiver with external reference oscillator, the model number will be G313i/180/XR. Options can be mixed together (except the IF options where only one can be selected, i.e. IF1 and IF4 cannot be selected at the same time).