SIHUADON D808 Portable Radio Transistor AM FM SW LW SSB Air Band Multiband Radio Loudspeaker Alarm Clock Sleep Timer Black

Product Information

Functional: Alarm function, sleep mode, and the time can be set and displayed in the off state. The sleep timer setting can be automatically turned off according to your lifestyle settings. R108 radio can be placed on the bedside, get up in the morning, enjoy the wake-up service of the radio, and watch the time with an open eye. When you brush your teeth, you can listen to the radio and keep up to date with the news. Allegedly, the Auto Tuning and Store feature seems to only find the stronger RF signals, probably because the firmware was set to use a too high threshold detection level, and there is no user setup to change it.The same behavior happens for the Manual Scanfeature, by presssing and holding the Up or Down keys for 2 seconds.

Telescopic antenna - Last section (with tip) detached from the rest. Also, the antenna mounting seems to be fragile, requiring great care when rotating it, as it can break the plastic support. My 2021 unit came with 3.81V in the battery (still a XHDATA 2000mAh device) and the battery level indicator had 2 bars. The XHDATA D-808 FM Stereo/LW/MW/SW-SSB AIR RDS Synthesized Receiver is supplied with a succinctOperation Guide that may not cover all the details of the radio operation behavior. Gone is the RF front-End with the 4-Sub-Bands pre-scaler using four LC trimmers for proper alignment and better spurius strong signals rejection, being replaced by common LCR fixed values networks using SMD components.Here are some of the behaviors detected by several owners and testers since this model was released:​ Some report loss of sensitivity after changing betwween RF bands.This seems to be a firmware bug, as it can be fixed by doing a power off/power on sequence, or remove and insert the battery, or doing a Reset (use a clip to insert in the Reset hole). Some owners have reported a fast battery depletion even when the radio is powered off, but this seems to be a fault developed with usage or a manufacturing defect.

Looking to the publicly available pictures, extensive changes were made in the circuit diagram and PCB layout of the Receiver board. In late 2022 a new version was quietlyreleased, despite the only visible difference to the previous versions being the use of a USB-C port instead of the older Micro-USB type. Otherwise the advertised features and performance remain the same. The DC-DC converter was not properly shielded in the previous versions, being a source of RF noise. Other better radio brands, even ones using the same basic chassis, use shielded DC-DC converters. A DW01A (IC2) & a 82015A MOSFET (IC1) do overcharge protection, while a TP4056 (U2) charges the Li-Ion battery at 400mA until it reaches 4.2V. LW band seems to show poor sensitivity on DSP radios like this model category, due to a poor design of the RF analog passive components that favors the MW band.If the MCU firmware is shuting down theCS4863 to avoid these nasty noises during band switching and fetching memory preset stations, as it should, then probably would be possible to fix it by following the Texas InstrumentsLM4863 datasheet.

My 2021 unit present these transitory noises. I wonder if the muting system is not being enabled by the MCU firmware. Bug or hardwaredesign fault? After around 4 hours charging, the battery level indicator movement stopped and showed 3 static bars. The battery had then 4.15V. SIHUADON R-108 not only has a manual search mode. It also has an Auto-Tuning Memory (ATS) mode. Press and hold “BAND” to automatically search for stations with stronger signals and store them in the radio. This mode greatly saves the time spent manually storing the station. For stations that do not receive strong signals, it is suitable for manual storage. Dual mode storage station for you to choose from. Initially I thought that this behavior wasrelated to a defective component,but now that I have my unit (new version 2021), I am not so sure.As the volume is a pure analog potentiometer, the noise must be generated inside the CS4863 (LM4863 equivalent) audio power amplifier IC.Due to product quality problems within 1-3 months of receiving the product, we can replace it with a new one, but the customer pays for the logistics costs incurred. Power supply issues - Power ON key fails to turn the radio ON, or else it power Off by itself, even with a fully charged battery, several causes for this, one being the use of inappropriate batteries (physically incompatible with the battery holder terminals). Despite being mentioned in the Operations Guide, there is no key for that. The D-808 was designed with automatic charging and management of the installed battery. Due to product quality problems within 3-12 months of receiving the product,we can repair it for free, but the customer pays for the logistics costs incurred. Even when inserting a fully charged Li-Ion battery, the radio only shows 3 bars (corresponding to at least 4.1 Volt reading)for a few minutes of usage.After that it will show 2 bars (around 3.7 Volt reading) for many hours of usage.Eventually it will show just 1 bar (low 3.4 Volt reading).