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

Product Information

I tested my D-808 with the low impedance AKG K240. There is low dB hiss even if you turn the volume all the way down. When you turn the volume up to 5%, you can still hear the hissing. In FM mode, this low noise is more noticeable. However, this hiss is not heard above 10% of the sound. A typical AVD would be between 1 and 5, maybe a mximum of 10, to contain the IC noise floor under inaudible levels. But doing so would result in very low volume levels because of the missing audio pre-amplifier stage.

Doingmanual tuning across RF bands results in muting/chuffing sounds when changing eachRF step.This seems to be a design characteristicof DSP based radios. In this model the volume drop can be reduced by seleccting the Slow tuning mode. The above situation happening only on SW. On FM, MW and Airband, D-808 is more sensitive and selective than R-108. (Exception is the LW band that both of them are not receiving anything at all). On the other hand, tuning through the bands is a pain. Every tuning step mutes the receiver for some tenth of a second. This is nothing I want to see in a radio of the 21st century. Pressing a button gives a "brrp" sound in the speaker. Not very nice.All these radios can overload easily at night with external antenna and so the local/DX button helps a lot, unfortunately the D-808 overload with external antenna can be quite a lot with no form of attenuation. Perhaps it is worth writing an article about the currently manufactured portable global receivers, as it was in this article. I also have to wonder … Chinese companies enter non-compete agreements when they produce something that has a specific brand label. Could re-branding be a way to avoid breaking contractural agreements – so they can offer a product in a marketplace? Jim, thank you for your suggestions. I had Degen1103 but sold it – it had encoder problems. I wish I knew it is that good on LW. Sangean is way to much expensive. I’ll try to find 7600GR then. Even after all of these years, my Sony 7600GR continues to hang tough and when connected to an external antenna, was performing almost as well as the X2 despite what should have been a run away in terms of all the benefits that come with a DSP based receiver.

I also use a Marantz PM5005 integrated amp to route audio to bookshelf speakers with great results, but all amps connected to ac supply will not work, they need to have very clean power supply so as to not introduce noise and signal interference.Thank you for sharing this technical overview of the XHDATA D-808, Gary! I’m looking forward to the antenna mods you’ll no doubt make to this compact DX machine! The PL-660 has 2 (I think unspecified) ceramic IF filters for SW, which are doing a good job serving 90% of all typical purposes for such a radio. The D-808 on the other hand utlizes the DSP for IF filtering and offers whopping 11 different bandwidths (6 on AM and 6 for SSB), this is even more than the PL-880! This sold the D-808 to me the most, for example I like to improve my very poor CW listening skills every so often, and always having an even narrower filter up the sleeve can save otherwise hopeless DX reception in the ham and broadcast bands. But are they any good? You can add to or update/edit your existing review's content including the Rating and Time Owned with the Edit button on the right side of the review text body. Edits will go thru the review Approval process. As mentioned above, signals can increase quite a bit in very close proximity to the water. When conditions were good, I’ve witnessed occasional overloading even with just the whip antenna on the PL-660 there. But the Tecsun has a 3-position sensitivity switch that first turns off the input amplifier and then adds an attenuator, so it can manage these situations by turning off the preamp and it happily digests signals from full size dipoles, long wires and active antennas with the built-in attenuator in the signal path. A valid product review is one where you have experience or knowledge of the product that you would like to share with others.

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. The D-808 also has fine tuning capability. This is not the same as the Tecsuns which actually enable you to re-calibrate, and with adjustment that remains set for both USB and LSB. On the D-808 you fine tune to zero beat, but have to repeat the correction for LSB and USB on the frequency you’re on – it’s a bit more twiddly, but on my 808 the fine tuning is nonetheless very smooth.

Frequency stability, accuracy, birdies, quirks

The Si4735 DSP chip has markings of “3560, DCUL, .738” and provides a wide range of AM bandwidth choices for the Medium Wave DXer (6K, 4K, 3K, 2.5K, 2K, 1.8K and 1K). These perform very well, and as with the other DSP-enhanced portables, the narrowest bandwidth (1K) provides the most sensitive AM band reception. To “a newer and faster DSP chip to speed up mode changes”: The D-808 is a Si4734/Si4735/Si4732 chip receiver. Other radios of this type are the very cheap chinese ATS-20 and ATS-25 or the well known brands radios Tecsun PL-310ET, PL-365, PL-360, PL-380, PL-880, Degen DE1103 DSP, DE1123, DE1126, Sangean ATS-909X, C Crane CC Skywave and Radiwow R-108. One of my best DX catches at that time was Radio Rwanda on 6,055 kHz just before it’s sign off in the late afternoon eastern timed. Using a Panasonic RF-B65 which had NO bandwidth options, I was able to hear and record a full sign off and ID.

Adopt DSP (Digital Signal Processing) technique,analog high and medium frequency circuit and many frequency conversion,highly improve the receiver sensitivity, selectivity and anti image interference capability For me, the unique combination of size, sensitivity and selectivity is making up for the shortcomings, it certainly remains a very interesting radio and I can’t remember carrying one around that much, ever.I was impressed with the sensitivity of the 808, large speaker, and inclusion of AIR band, though I noticed some digital artifacts and agree with negatives such as slight soft muting and chuffing, and slowness of the processor. You don’t find that kind of selectivity capability even in a Drake R8B. After that, you’re getting into continuously variable bandwidth control found in premium DSP receivers. The second pair of digits is a crude calculation of receiver (not audio!) SNR, which can be useful in conjunction with the signal strength meter, e.g. for adjusting or comparing antennas and so on, and it works best with AM and FM signals. Hello. I received the XHDATA D-808 today. A nice little radio. I am however wondering if anybody out there knows how to deactivate the Alarm function? The instruction manual is vague regarding this.