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XHData D-808

Posted: 17 Feb 2018 10:47
by satnipper
Not been much talk of this one here. All bands including RDS Chinese portable. Google for reviews and prices - £81 ish.

Stuart

Re: XHData D-808

Posted: 18 Feb 2018 08:19
by Patrick73
Hi there !

I ordered mine on Monday, received yesterday (€66 / £58, including shipping).
More to follow ;-)

Re: XHData D-808

Posted: 19 Feb 2018 19:39
by satnipper
Received mine yesterday. Seems a keeper - good MF sensitivity. RDS seems ok as well but need some lift conditions to see just how good it is.

Tecsun 310 and 380 for sale - £10 each!

Re: XHData D-808

Posted: 20 Feb 2018 19:39
by Patrick73
It is slightly less sensitive compared with the PL-380 (at least the one I own).
Slightly less selective as well. Sounds like the DSP is more "agressive". When tuned to a weak station close to a louder one, one has to fine tune / detune by 10 20 or 30k for the signal to become audible and to lock on. No such behaviour on my Tecsun.

Good points : RDS is fine, audio not bad.
Very sensitive on MW (but still showing the so-called "soft mute" issue when tuning. Can be a bit annoying).

For less than 70 euros a nice radio, probably one the best in its range.

Re: XHData D-808

Posted: 23 Feb 2018 22:17
by simbeav
Mine arrived the other day as well. The PL-606 had developed a fault on the volume dial.
WFME yesterday morning and VOCM this evening coming in OK with just the internal antenna.
RDS seems ok - No DX at the moment, but both Bridge FM and GTFM which lesser radios struggle with RDS at my QTH were resolved easily and quickly.
OIRT a nice bonus. Direct frequency tuning makes a big difference to the 606.
Haven't tested HF too much as the noise here is too great to get much with a whip.
All-in-all very happy.

Re: XHData D-808

Posted: 23 Mar 2018 11:41
by KPC850
MW band modes from the manual online:
Activate 9/10kHz Tuning Button
·When in 9k mode, the frequency range is 522-1620kHz, intelligent step is 1kHz / 9kHz (for Asia, Africa and Europe)
When in 10k mode, the frequency range is 520-1710kHz, intelligent step is 1kHz / 10kHz (for North America)
They seem to have forgotten/overlooked the Australian market (or visitors bringing the radio there), Australia has 9kHz MW steps but have an expanded MW band up to 1701kHz (this receiver only goes up to 1620kHz in that mode according to manual).

Frequencies 1621 to 1710 kHz are completely inaccessible in 9kHz MW step mode - as well as normal tuning, keying in the frequency digits will not work either , nor will fine tuning in 1kHz steps go above 1620.
Even is you save a preset from this frequency range whilst in 10kHz step mode , then try go back to 9kHz step mode, the preset gets erased!

Re: XHData D-808

Posted: 26 Mar 2018 15:44
by KPC850
Some very clear pics of the inside of the XHDATA D808 in a posting on this thread on a Russian messageboard:

http://www.radioscanner.ru/forum/topic4 ... msg1353258

I spot a Crystal of 35.328MHz - This is related to Airband mode - this crystal is only active on airband receive. Another radio along side it picks up a XTAL harmonic on 106.0 MHz FM approx ( 35.328 X 3 = 105.984 ), when the XHDATA is in AIRband mode.

Also two other crystals at least one (though I assume both) are 32.768 kHz a common clock frequency (one 32.768 for microprocessor, the other for DSP chip). On some other DSP receivers, harmonics of 32.768kHz may cause noticeable hetrodynes on some AM frequencies (depending on signal strength etc) , 882kHz for example would be one (a harmonic of 32.768 kHz is 884.736 kHz so a 2.736 kHz whistle may be there on 882kHz) (edit - the XHDATA seems to be free of this effect)

(Some edits to my above post made as I have since obtained one!)

Re: XHData D-808

Posted: 07 Nov 2018 22:33
by KPC850
I don't wish to take from the undoubted positives of the radio, but one issue with the XHDATA D808 I have used - there is a surprisingly long pause of complete silence of just over 4 seconds when switching to MW or LW , or even switching between MW and LW.
Switching to its other bands this mute pause isn't as bad, slightly under 3 seconds, but still longer than might be expected.
I assume all are the same?

Is the above technically necessary? I doubt it.

Before you get used to it, switching to say MW you may momentarily wonder have you accidentally done something to switch the radio OFF before the just over 4 seconds of muting/silence is up! (especially if you have difficulty seeing the display due to no glasses, or visual disability) or else you instinctively go and turn the volume up before audio actually returns!

During some recent FM tropo, and some FM DXing whilst out and about with this radio, I would sometimes want to briefly switch to MW (AM) to confirm the identity of some weak distant (BBC) FM stations that also broadcast on AM, and I was again irked by the pauses in switching bands.
On the other hand, switching presets within the current waveband is responsive without delay.