The comb generator SG 9302 C generates a spectrum composed of lines separated by 100 MHz up to 18 GHz. Combined with an antenna, it can be used as an emission source for testing open area test sites, anechoic chambers or GTEM units. Individual components such as measurement receivers, spectrum analyzers, cables and attenuators can also be tested.

main feature:

        Since the spectral lines always appear without any tuning process, this operation is very simple and saves time. The built-in rechargeable battery makes it a universal, simple and cost-effective alternative to signal generators. Signal generators are still very expensive, so they are rare in the frequency range above 3.6GHz.

        The output level of the comb generator is relatively high, and the frequency far exceeds 18 GHz. The limit for the N connector is 18GHz, so this limit also applies to the generator, although the spectrum is wider. VCTCXO is used as the frequency standard. This abbreviation stands for "voltage-controlled temperature-compensated crystal oscillator".

       The compensation circuit can make the crystal have good frequency stability. In addition, a tuning voltage can be used to tune the nominal frequency within a narrow range. This makes it possible to compensate for the small frequency difference between the comb generator and the receiver. In the open test site, the collision with environmental signals can be avoided by fine-tuning the frequency.

       The device is turned on by the pilot power switch. Push the switch to the top. The green LED "on" indicates that the battery is charging normally. The red LED "low battery" indicates that the battery is almost dead. If the LED dims even when the generator is turned on, the rechargeable battery will be disconnected due to low voltage. After charging, the generator will be ready to run. Turn the control button "-∆F+" on the right side of the front panel to make the white line on the knob point to "100 MHz". The comb generator can now be measured and connected, such as an antenna.

       Use the frequency fine-tuning control "-∆F+" to move the reference frequency within a narrow range. When the trimming is activated, the red LED lights up to avoid accidental frequency shifts that may cause false measurements. The fixed position "100 MHz" is the standard position (LED dim). Intentional frequency tuning can be used to compensate for the frequency difference between the SG 9302 C and the receiver. However, it must be considered that, compared with comb generators, receivers or spectrum analyzers do not have a simple relationship between the reference frequency and the receiving frequency. Perfect tracking on one frequency may cause severe excursions elsewhere. Frequency tuning may also help avoid conflicts with interfering signals, such as testing venues in open areas.