Control Tab

By switching the tab to Control, the user has simple control over the Web-888 SDR, such as restarting the Web-888 SDR, forcing users to go offline, etc.

Server restart

restart the application and Linux OS will not impacted.

HF Bandwidth Selection

Set the bandwidth of the HF band, either 64Mhz or 32Mhz. Require server restart to take effect.

Warning

64Mhz supports 12 Rx channels while 32Mhz supports 13 Rx channels.

Share or Exclusive mode for WF. This switch controls how many spectrum clients we can support. In Shared mode, there are 13 clients with WF supported, and each client can only zoom up to zoom level 9. In Exclusive mode, only two clients can use spectrum but it can zoom up to zoom level 13.

Enable user connections

when set to No, Web-888 SDR will reject any incoming connections

Switch Between HF or Air Band

HF or Air Band mode. Require server restart to take effect.

Switch the input to VHF SMA port and sample the data from 118MHz to 147MHz if selected Yes.

In Airband (VHF) mode, web-888 covers all air band and most 2m band (144-147MHz). This is achieved via oversampling. The ADC switches to 98Mhz. And the VHF BPF filter in front of ADC is used.

Close all active user connections

force all users connected to Web-888 SDR to go offline

Number of simultaneous channels available for connection by non-Kiwi apps

the maximum number of connections allowed for third party apps

Disable waterfalls/spectrum

Disables spectrograms in user UI.

Reason if disabled

When Enable user connections is set to No, the text showded to the user the reason why the site is down, can use HTML tags.

Inactivity time limit

time limit for incoming users, 0 is no limit

24hr per-IP addr time limit

time limit for incoming IPs, 0 is no limit

Time limit exemption password

password to bypass the time limit

Number of audio campers per channel

Reduce this to save some CPU cycles with the price of reducing sound quality.

SNR measurement interval

This setting controls how frequent web-888 to measure SNR.

Automatic sampling of the signal-to-noise ratio (SNR) at specified intervals is a process used to continuously monitor and measure the quality of a signal over time.

SNR is a key parameter in communication systems, representing the ratio of the desired signal's power to the power of background noise.

Higher SNR values indicate a clearer and more reliable signal.

By enabling automatic sampling, the system periodically measures the SNR at set intervals, providing valuable data on the signal's performance and stability. This can help in identifying issues such as interference, signal degradation, or other anomalies that may affect the quality of the communication system.

Type: http://web-888.local:8073/snr into the web browser and press ENTER. This will appear on the PC:

[
    {
        "ts": "Wed Dec 18 06:15:28 2024",
        "seq": 0,
        "utc": 1,
        "ihr": 1,
        "snr": [
            {
                "lo": 0,
                "hi": 30720,
                "min": -114,
                "max": -57,
                "p50": -91,
                "p95": -82,
                "snr": 9
            },
            {
                "lo": 1800,
                "hi": 30720,
                "min": -114,
                "max": -57,
                "p50": -91,
                "p95": -82,
                "snr": 9
            },
            {
                "lo": 0,
                "hi": 1800,
                "min": -106,
                "max": -79,
                "p50": -95,
                "p95": -83,
                "snr": 12
            },
            {
                "lo": 1800,
                "hi": 10000,
                "min": -93,
                "max": -57,
                "p50": -85,
                "p95": -79,
                "snr": 6
            },
            {
                "lo": 10000,
                "hi": 20000,
                "min": -99,
                "max": -68,
                "p50": -91,
                "p95": -86,
                "snr": 5
            },
            {
                "lo": 20000,
                "hi": 30720,
                "min": -114,
                "max": -86,
                "p50": -101,
                "p95": -92,
                "snr": 9
            }
        ]
    }
]

Measure SNR now

Immeidate trigger a SNR measurement activity.