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

£39.99
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SIHUADON D808 Portable Radio Transistor AM FM SW LW SSB Air Band Multiband Radio Loudspeaker Alarm Clock Sleep Timer Black

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

RRP: £79.98
Price: £39.99
£39.99 FREE Shipping

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Description

Shortwave Single Side Band (SSB) minimum step is 1kHz, Upper Side Band (USB) and Lower Side Band (LSB) reception independent Confirmed. Litz wire speccification used in the single coil around the magnetic ferrite rodantenna is optimized for MW frequency spectrum. An additional LW coil with adequate Litz wire would be required, as seen in the good old radios of yesterday. Solution 1: Use a battery operated headphone amp. Keeping the volume on radio to moderate/high use the volume on headphone amp to reach desired level. This will completely eliminate the noise. This works because the audio signal to noise ratio increases so much with moderate volume that when you reduce the audio through the amp the noise levels become absolutely inaudible. I use FiiO Q1 amp which has a digitally stepping volume control which eliminates any stereo channel imbalance at low volume. This imbalance issue is also there in d808 because it has analog potentiometer vol. control. However, had a D-808 existed at that time this would have been much easier because of the multiple bandwidths in both AM and SSB. I imagine a SONY ICF-SW7600GR would have done a good job as well, but it too does not have the multiple bandwidth options that a D-808 has. Here are some of the behaviors detected by several owners and testers since this model was released:​

I love reading a well-prepared review of shortwave radios especially those of multiband portables with SW. This comparative review of the D-808 and the PL-660 is outstanding. Tecsun started providing this on small receivers years ago, and in the PL-880, the excellent though flawed portable that also took the listening world by storm, and in the recent 330, 990x and 501x.

To “It’s doubtful that XHDATA or some other manufacturer will consider competing directly with Tecsun and Sangean”: My Sony 7600GR is one of the best portable analog dual conversion radio receivers. I think there are more then one thousand components in the housing. Because of this low level of integration the radios of different brands were different. My ATS-20 has less then one hundred components – and I assume that the other Si47xx radios have the same number of components. Because of this there is no much difference between a no-name D-808 and a Tecsun if both use a Si47xx.

Notwithstanding some duds, the PL-660 is known to be a little sensitivity monster on shortwave. When I don’t feel like putting up wires etc. for my SDR, I just take the Tecsun to the beach and through the years I own it, I’ve logged plenty of true DX (JA, VK/ZL or WWVH on a regular basis) with it there, just using the telescopic whip. Other than that, it seems to abide <10m/30ft of wire just fine and it gets along with my ML-200 active loop, currently indoors with a rigid 80cm aluminum loop, unless the RRI transmitters populate 49 and/or 41m after midnight. That station occasionally hits the 9+60 mark on my SDR with a dipole and when they’re on, the D-808 has to be tuned far away from these bands or disconnected from the loop to stop the pumping, desensitizing and intermodulation products. Interestingly, strong signals often make the filter drop out (as described under “SSB reception”) as well. A theory could be that this happens when an off-band signal (and/or the AGC causing “clipping”) makes an AD-converter run out of bits. I have both the D-808 and PL-660. I have to say my experience is contrary to some of the findings in this review. My PL-660 trounces the D-808 on LW. It’s not even close. Even at night here in the UK the D-808 struggles to get BBC Radio 4 on 198khz. Pretty much nothing else. The PL-660 pulls in all the main stations from Europe, some very strongly. On MW they’re both very similar, a slight edge to the PL-660. This amazed me because when I got the PL-660 the other day I was buying on the expectation that MW and LW were poor. A bonus!

Control

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.

Outsides where the noises of the digital world are gone, the D-808 presents all bands almost as filled as my dipole at home and so there’s always an interesting QSO or some overseas radio program to enjoy. To give you an idea on what I mean by “no compromises”: my companion on today’s walk was NY2PO from upstate NY (3,728mi/6,000km away) on 40m, constantly coming in with a signal allowing for convenient listening, despite the bad conditions (SFI=68 A=10).When I really get to dreaming, I think of XHDATA or some other maker designing a portable like the 808 – why not call it the 1000 Super DSP – that actually has continuously adjustable bandwidth control. This will never happen. Nevertheless, it's possible to listen to amateur radio transmissions and I don't see it as a substitute for a "full size" station receiver. Oddly, the published bandwidth for the AM filters seem to be “audio bandwidth” (or “per sideband”) figures rather than IF-bandwidths, so they equate to classic IF filters with 2/3,6/4/5/6/8 and 12 kHz bandwidth. The only overlap is 4 kHz, hence I say it’s 11 different bandwidths, not 10. I think these AM bandwidths should cover all requirements that might come up, on top of those you can try ECSS reception with the SSB filters. SSB Reception

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.

Some random things I like:

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. Here was a small, well-designed DSP radio that burst upon the scene with outstanding capabilities and which even today is prized among those who own it. Need I repeat? SEVEN bandwidths in AM mode, and MW, and SIX in SSB and LW.



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