XHDATA 808 FM reception

FM receiver discussion
Alex Lawler
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XHDATA 808 FM reception

Post by Alex Lawler » 06 Nov 2019 18:06

I bought the XHDATA 808 primarily for MW and SW where it performs very well but wondered if people had suffered from intermod on FM. I don't usually DX band 2 but scanned around today and noticed Classic FM which is on 101.5 in Norfolk went from 101.3 to 101.8. Likewise Radio 2 which is on 89.7 in Norfolk goes down at varying levels to 89.1. Strangely Kiss, Heart and Radio Norfolk only give 100 kHz adjacent splatter so the selectivity around there is excellent.
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KnobTwiddler
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Re: XHDATA 808 FM reception

Post by KnobTwiddler » 07 Nov 2019 00:30

I don't think it's intermod it's just that you are receiving other Classic FM and Radio 2 transmitters, the receiver is reported as having good sensitivity and selectivity on FM but not so hot on Long wave.
Radio 2 on 89.7 is from the high power Tacolneston transmitter which is your local transmitter and 89.1 is the high power Wrotham transmitter that serves London and the South East, you are receiving both transmitters in Norwich and I receive both transmitters here in London.
I receive at least 6 Radio 2 and 5 Classic FM transmitters on my Tecsun PL-880 on it's telescopic aerial - if it wasn't for the pirates and community stations here in London I would be able to hear even more.

Here is an excellent site that does reviews of small portable radios >> https://swling.com/blog/2018/04/a-detai ... un-pl-660/
AirSpy HF+ SDR + Home-brew Mini Whip for LW/MW/HF + 9:1 Balun + Whip Aerial
Yamaha T-D500 Tuner For DAB
Tecsun PL-880
Yaesu FT-897D + FT-2900
Icom IC-7300 (Awesome piece of kit) + Icom IC-706 MkII + Icom IC-2200H
Anytone AT-588 for 70Mhz

Alex Lawler
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Re: XHDATA 808 FM reception

Post by Alex Lawler » 07 Nov 2019 10:19

Thanks for the info. I'll check out the link. It's unbeatable on MW and SW for the £70 price.
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pe1etr
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Re: XHDATA 808 FM reception

Post by pe1etr » 07 Nov 2019 13:04

Alex Lawler wrote:
06 Nov 2019 18:06
I bought the XHDATA 808 primarily for MW and SW where it performs very well but wondered if people had suffered from intermod on FM. I don't usually DX band 2 but scanned around today and noticed Classic FM which is on 101.5 in Norfolk went from 101.3 to 101.8. Likewise Radio 2 which is on 89.7 in Norfolk goes down at varying levels to 89.1. Strangely Kiss, Heart and Radio Norfolk only give 100 kHz adjacent splatter so the selectivity around there is excellent.
Hello Alex,
What describe is overload. The front end on the D-808 is not very robust. I only have one local FM signal so not as much as a problem here, however, I get overload from strong out of band signals such as pagers. If I take my D-808 down to the seafront pager breakthrough and saturation of the front end is quite bad. The Tecsun PL-398MP is unaffected.
The PL-398MP is also better on MW and SW, and is about £17 cheaper. Manual tuning on the D-808 is easier than on the PL-398, direct frequency entry is much simpler on the PL-398.
The D-808 has airband, RDS and SSB, but try tuning around in SSB mode whilst wearing earbuds! It is difficult getting RDS when all you can hear on FM is white noise.

Peter
Blackpool

Alex Lawler
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Re: XHDATA 808 FM reception

Post by Alex Lawler » 07 Nov 2019 20:35

Thanks Peter. I may look into getting a 398 for FM DX if it is at least as selective and sensitive as the 808 and without the overload problem I'm experiencing on FM. Does the cheaper 310et compare favourably with the 398?
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pe1etr
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Re: XHDATA 808 FM reception

Post by pe1etr » 07 Nov 2019 22:07

Alex Lawler wrote:
07 Nov 2019 20:35
Thanks Peter. I may look into getting a 398 for FM DX if it is at least as selective and sensitive as the 808 and without the overload problem I'm experiencing on FM. Does the cheaper 310et compare favourably with the 398?
Alex,
You're welcome.
I don't have the PL-310ET, so can't make a direct comparison, however, I do have the PL-606 & ETON E8 (PL-300WT). The PL-398MP is certainly the best out or the three on FM and MW. From what I've seen on YT and read, the PL-398MP is also better than the PL-310ET.
Peter

Alex Lawler
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Re: XHDATA 808 FM reception

Post by Alex Lawler » 08 Nov 2019 05:52

Thanks, look's like I'll be getting the 398 soon.
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pe1etr
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Re: XHDATA 808 FM reception

Post by pe1etr » 08 Nov 2019 06:21

Alex Lawler wrote:
08 Nov 2019 05:52
Thanks, look's like I'll be getting the 398 soon.
You're welcome.
If you want to save £13 and get a smaller radio, and are only interested in FM, you could get the PL-310ET for slightly reduced performance, however manual tuning in steps is easier on the PL-310ET. Don't forget the 398 has stereo speakers which sound quite good on FM.
They both have ETM (Easy Tuning Mode)which is a very nice feature for quickly scanning for DX without erasing main memories.

Peter

Alex Lawler
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Re: XHDATA 808 FM reception

Post by Alex Lawler » 08 Nov 2019 08:22

Cheers, I think the 398 is going for £46.79 on eBay with Anon and there is even a £5.00 discount code so may go for that. I'm only interested in FM as I'm happy with the 808 for SW and SSB. If the 398 has better sensitivity, selectivity and no overload issues then as you say it's the best option, even over the 310et.
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pe1etr
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Re: XHDATA 808 FM reception

Post by pe1etr » 08 Nov 2019 09:19

Alex Lawler wrote:
08 Nov 2019 08:22
Cheers, I think the 398 is going for £46.79 on eBay with Anon and there is even a £5.00 discount code so may go for that. I'm only interested in FM as I'm happy with the 808 for SW and SSB. If the 398 has better sensitivity, selectivity and no overload issues then as you say it's the best option, even over the 310et.
The 398 is £53 on amazon UK, and it is actually in stock in the UK and delivered by amazon, so will get to you in a couple of days and the price includes delivery and VAT. Less risky and quicker that getting it sent from Hong Kong. The amazon version is the MP version, the BT version is more useful.

Alex Lawler
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Re: XHDATA 808 FM reception

Post by Alex Lawler » 08 Nov 2019 10:19

Thanks, one last question. What is the BT version and why is it more useful?
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Re: XHDATA 808 FM reception

Post by pe1etr » 08 Nov 2019 11:08

Alex Lawler wrote:
08 Nov 2019 10:19
Thanks, one last question. What is the BT version and why is it more useful?
BT= Bluetooth ;)
You can use the PL-398BT as stereo speakers for a phone/tablet etc, via bluetooth rather than wired to the Line In.

Alex Lawler
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Re: XHDATA 808 FM reception

Post by Alex Lawler » 08 Nov 2019 11:26

Thanks.
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Alex Lawler
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Re: XHDATA 808 FM reception

Post by Alex Lawler » 19 Nov 2019 06:45

It's just arrived! Is there anyway of changing to 0.1mhz manual tuning which is my preferred method. In other words I want to tune 95.1, 95.2 and 95.3 etc. I've followed the instructions by pressing VF to 0.1 but it reverts back to its default in a few seconds. So far it seems selective and sensitive but unfortunately there is an overload issue,101.5 Classic can be heard down to 101.3 and up to 101.8. I guess I'm just too close to the transmitter for a portable to handle.
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pe1etr
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Re: XHDATA 808 FM reception

Post by pe1etr » 19 Nov 2019 14:28

Alex Lawler wrote:
19 Nov 2019 06:45
It's just arrived! Is there anyway of changing to 0.1mhz manual tuning which is my preferred method. In other words I want to tune 95.1, 95.2 and 95.3 etc. I've followed the instructions by pressing VF to 0.1 but it reverts back to its default in a few seconds. So far it seems selective and sensitive but unfortunately there is an overload issue,101.5 Classic can be heard down to 101.3 and up to 101.8. I guess I'm just too close to the transmitter for a portable to handle.
Did you buy the XHDATA D-808?

Alex Lawler
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Re: XHDATA 808 FM reception

Post by Alex Lawler » 19 Nov 2019 14:47

Already had the XHDATA. I got the Tecsun 398BT.
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pe1etr
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Re: XHDATA 808 FM reception

Post by pe1etr » 19 Nov 2019 18:33

Alex Lawler wrote:
19 Nov 2019 14:47
Already had the XHDATA. I got the Tecsun 398BT.
Maybe if you'd said that in your previous post. :)
The tuning steps are governed by the speed of spinning the wheel. Easier to use ETM or direct frequency entry. The tuning wheel is the Tecsun's weak point, as I pointed out before.

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Re: XHDATA 808 FM reception

Post by Alex Lawler » 30 Nov 2019 19:53

Thanks,I returned the 398 due to its sampling rate being the same as the XHDATA and the S10. I was confused so asked a friend who owns an S10 and it seems the sample and hold circuit in the analogue to digital converter overloads producing spurious signals. In otherwords Tacolneston Radio 2 on 89.7 appears at 89.4 as well. Likewise Classic FM on 101.5 appears on 101.8. These spurious signals of course splatter over to 89.3, 89.5, 101.7 and 101.9 respectively, rendering large parts of the spectrum useless for dxing. So basically you are right the 398 is selective and is good at preventing overload in some respects but the digital to analogue converter causes problems with some strong signals which appears to be my problem. I have since ordered a 310 as you previously suggested. As you say it is not as sensitive and has a smaller whip but this may help prevent against the spurious signal problem. Anyway if it doesn't I'm stuffed at my location and will just have to make do with it. At least it's cheaper and I can manually tune in 0.1mhz increments more easily. Thanks for your advice.
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pe1etr
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Re: XHDATA 808 FM reception

Post by pe1etr » 30 Nov 2019 20:32

You're welcome.
I've never had the problem you describe with any of my Tecsun DSP portables.My older ones have been around the World with me, including close to high power transmitters.
Another Chinese DSP radio (probably made by Tecsun) will arrive on Thursday.
Peter

Alex Lawler
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Re: XHDATA 808 FM reception

Post by Alex Lawler » 03 Dec 2019 14:46

How is you're new radio? I saw in another thread you are testing it out.
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