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It is used to instruct the AGC to tolerate an extra 3 dB of signal power before setting the next attenuation level.

When turning the Analog AGC on, you will notice that you also have a “Threshold” option available.

If in doubt, turn the AGC on and let it do the job. Higher levels do not necessarily improve your SNR but will definitely reduce your available dynamic range. In general, push the attenuation until the noise floor is around -100 dBFS.

When turning the Analog AGCs off, you can control the stepped attenuator manually, but then, it’s up to you to determine which attenuation level is adequate for your signal at input.

This mechanism ensures your signals are always scaled properly for unattended operations.

The Digital IF AGC is always activated and only starts acting when the strongest signal(s) in the IF spectrum exceed -6 dBFS.When enabling the AGC in the Source panel, you are activating both Analog AGCs. The role of the Analog AGCs is to adapt the sensitivity of the front-end to the signals at the input.Narrow band AGC, which is the AGC panel controlling the signal that passes through the VFO filter.Digital IF AGC, to make sure the data is scaled properly (by digital amplification) before sending to the computer,.Analog IF AGC, which controls the IF gain just before the digitization.RF AGC, which activates a 6dB stepped attenuator,.The Airspy HF+ Discovery boasts one of the most sophisticated HF front-end of the market with multiple AGC loops at different stages to achieve the best gain distribution possible. Your browser does not support the audio element.Īudio signal with our Digital Noise Reduction processing: Ready to discover all these signals hiding in your spectrum?

With its world class strong signal handling capability and incredibly Low Noise, the HF+ Discovery is the ideal companion for All your High Performance Receive Scenarios.īoth the architecture and level of integration achieved in this design allow us to bring top performance reception at a very affordable price.Īll the major SDR software is supported. The included band-tracking pre-selectors eliminate unwanted interference and preserve the dynamic range of the receiver. The signal path includes very high dynamic range data converters along with high performance passive mixers with an excellent Polyphase Harmonic Rejection structure. The Airspy HF+ Discovery sets a new standard in terms of reception performance with extra pre-selectors for all the supported bands and a New DSP Core to optimize the gain distribution and the filtering parameters in real-time and dig deeper in the noise. Building on the field-proven Airspy HF+ architecture, we designed the Most Refined HF/VHF SDR with world class performance in the smallest form factor.