Common Troubleshooting

This guide provides solutions for common issues users may encounter when using the Web-888 SDR device.

LED Status Indicators

Several LEDs on the side of the Web-888 provide status information:

D0 (Blue LED): Turns on when the Linux kernel is fully loaded
D2 (Green LED): Flashes when the web server is up and running
Additional LEDs may be used for other status indicators in future firmware versions

After powering on and successfully booting the system from the TF card:

The D2 green LED will turn off during normal operation
If the D2 green LED remains on after powering up, it indicates that the system on the TF card did not boot properly. In this case, reformat the TF card (FAT32 format is recommended) and copy the firmware back to the root directory
Once the system loads successfully, the D0 blue LED will light up, and the D2 green LED will flash intermittently

Symptom: Your router can see the hostname of the Web-888 SDR (web-888.local) in its device list, but when accessing the corresponding IP address, you receive a "connection denied" or "connection timeout" error.

Possible Causes:

First boot of the system (slightly slow)
TF card was written using an image tool to write the Zip package (incorrect method)
TF card has an additional folder layer - verify the folder content
TF card corruption
Insufficient power supply current
The router hasn't updated the DHCP client list immediately after rebooting the Web-888 SDR

Solutions:

Wait a few minutes and try again
Go to Downloads to download and copy the latest firmware content to the card
Replace the TF card with a Class 10 card with a capacity of 200MB or more
Use a power supply with a higher full load current (at least 2A)
Access the Web-888 SDR directly using the hostname or reboot the router

Device Drops Out

Symptom: The device drops out for no apparent reason after a period of operation and requires a power cycle to return to normal operation.

Possible Causes:

Insufficient power supply current
Aging of the power cable
Poor contact with the power socket

Solutions:

Use a power supply with a higher full load current (at least 2A)
Replace with a good quality USB Type-C power cable
Replace the power socket

Very Slow Webpage Loading

Symptom: After several quick refreshes of the Web-888 SDR webpage, the webpage loading speed suddenly becomes extremely slow.

Possible Cause:

You are being rate limited by the device's built-in protection mechanisms

Solution:

Close the current tab and wait a few seconds before revisiting the page

Can't Receive GPS Signal

Symptom: The Web-888 SDR is connected to the GPS antenna, but still cannot acquire a GPS fix for frequency calibration.

Possible Causes:

GPS antenna is damaged
Web-888 SDR uses Navstar, QZSS, Galileo satellites for positioning and the signal is weak
Using a passive GPS antenna instead of an active one

Solutions:

Replace the GPS antenna with a known working unit
Place the GPS antenna in an open area with a clear view of the sky
Replace a passive antenna with an active GPS antenna

Intermittent Bursts of Sound

Symptom: Intermittent bursts of sound when receiving certain stations.

Possible Causes:

Short signal overload due to fluctuating signals from shortwave stations
AGC (Automatic Gain Control) related options are incorrectly set

Solutions:

Enable the Synchronous Aperture Detection (SAM) function on the dashboard or connect the antenna to the HF-1 interface
Adjust the AGC-related options in the dashboard until the popping sounds stop

Spectrogram is Black

Symptom: The webpage opens, but the spectrum graph is black with no sound, and the Status tab in the dashboard does not output statistics.

Possible Causes:

External ADC clock is mistakenly enabled
Web-888 SDR failed to initialize the FPGA
The FPGA chip has been damaged

Solutions:

Set External ADC clock to "No" in the Connect tab in the administration interface
Try to reboot the device by unplugging the power supply
Contact the dealer for repair of the Web-888 SDR