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by daveB
09 Jan 2018 14:54
Forum: Medium Wave & Long Wave
Topic: BBC January Closures
Replies: 8
Views: 205

Re: BBC January Closures

And BBC Kent announced MW closures before Christmas. 774 kHz and 1602 KHz are affected. Currently 774 kHz is transmitting "retune to FM or DAB or Freeview" kHz - 1602 kHz is/was very weak hre.
by daveB
04 Jan 2018 11:07
Forum: DAB
Topic: DAB I/Q samples needed
Replies: 0
Views: 56

DAB I/Q samples needed

Could someone(s) record some I/Q samples of DAB MUXes using the qt-dab program and post a link to it/them so that we can test an algorithm for decoding the Transmitter Identification Information more extensively? A 200-250 Mb sample would be ideal. Either using an RTL dongle or SDRPlay would be fine...
by daveB
21 Dec 2017 18:10
Forum: DX Alerts
Topic: Big Tropo?
Replies: 26
Views: 480

Re: Big Tropo?

Tropo reception for 2017 seems to have by passed me to a large extent. I don't think I can blame it on interference either. It seems to have favoured the South Coast this year. The significant dates were 9th Apr, 28 May, 13-15 Oct, 17 Oct, 26 Oct. There was enhancement on 27 Aug and 31 Oct but only ...
by daveB
19 Dec 2017 16:25
Forum: DAB
Topic: DAB software gives Transmitter identification Info
Replies: 5
Views: 164

Re: DAB software gives Transmitter identification Info

The other bit of useful software is Spectrum Spy if you own an Airspy - you can set it 20 MHz or 50 MHz - or wider and see all the DAB Muxes that are present. Or use SDR# for 10 MHz - it is more sensitive. Currently I'm showing 10B, 10C and 10 D - 10B is below the threshold for detection. This morni...
by daveB
19 Dec 2017 15:51
Forum: DAB
Topic: DAB software gives Transmitter identification Info
Replies: 5
Views: 164

Re: DAB software gives Transmitter identification Info

I keep mistyping that name! Actually there is now an even newer version 1.0. alpha And with QIRX version 0.9.4 shows both the TI codes - as used by the UK, and where present - the geographic codes - which the Netherlands and Italy and some Germans stations use. To get the geographic codes you have t...
by daveB
19 Dec 2017 00:24
Forum: DX Alerts
Topic: Big Tropo?
Replies: 26
Views: 480

Re: Big Tropo?

I've got a signal on 10D from "Herts, Beds & Bucks" with intermittent squitty audio. The weaker London MUXes 11B and 12A are coming through with clean audio on the FM 3 ele vertical. There are also weak signals on 10B and 10C showing on the waterfall display of SDR# but not resolvable on qt-dab. So ...
by daveB
17 Dec 2017 21:38
Forum: DX Alerts
Topic: Geminids meteor shower imminent
Replies: 5
Views: 190

Re: Geminids meteor shower imminent

The early hours of the 14th gave loads of short burst and pings - short term over 120 ZHR. But only tiny tiny percentage were worth checking for RDS as they were just not strong enough (or background interference was higher than previous years).
by daveB
16 Dec 2017 22:12
Forum: DAB
Topic: DAB software gives Transmitter identification Info
Replies: 5
Views: 164

Re: DAB software gives Transmitter identification Info

Update: Version 0.9.4 has been released and comes with the dabTII.dll as standard
by daveB
16 Dec 2017 17:48
Forum: DAB
Topic: DAB software gives Transmitter identification Info
Replies: 5
Views: 164

DAB software gives Transmitter identification Info

I never got DABPlayer working - so checked and tested some other packages. qt-tab which is an update of sdr-j supports the rtl-dongle, sdrplay, and airspy. SDRPlay is the most sensitive - I have an RSP1. If the DAB data includes geographical data - this will displayed - first in the command line ter...
by daveB
12 Dec 2017 14:22
Forum: DX Alerts
Topic: Geminids meteor shower imminent
Replies: 5
Views: 190

Re: Geminids meteor shower imminent

It's only the most prolific meteor shower of the year with 120 per hour! Next one on the scale is the Quarantids - at the beginning of January at 100 meteors per hour.

Nothing showed up in the early hours of this morning at the top half of the band - just a few pings.
by daveB
11 Dec 2017 21:07
Forum: DX Alerts
Topic: Geminids meteor shower imminent
Replies: 5
Views: 190

Geminids meteor shower imminent

The Geminids meteor shower should be making an appearance about now - once again it is supposed to peak in the early hours of the 14th. The Geminids make their appear from 1600 to around 1130 UTC Last year most of my reception came from the East - from 0100 - 0600 and in the early evening from 1900 ...
by daveB
03 Dec 2017 00:04
Forum: Receivers
Topic: For demanding FM DX'er ... (18 bits ADC SDR)
Replies: 11
Views: 918

Re: For demanding FM DX'er ... (18 bits ADC SDR)

It is a trade off between ADC resolution and bandwidth. SDRPlay RSP1A now offers 14-bits resolution at sample rates of 6 MHz and below - which I guess would give an effective bandwidth of 5 MHz. In theory that should give an extra 12 dB dynamic range compared to the 12 bits of the Airspy/Airspy Mini...
by daveB
01 Dec 2017 12:07
Forum: Medium Wave & Long Wave
Topic: Curious Sunrise Fadeout Effect
Replies: 12
Views: 646

Re: Curious Sunrise Fadeout Effect

But is the burst of noise "around sunrise" or is it that at this time of year sunrise happens to coincide with a burst of noise that occurs at a regular time during the morning? Among other noise issues on FM, in the past I've experienced severe noise which I put down to a nearby factory turning on ...
by daveB
25 Nov 2017 13:12
Forum: Medium Wave & Long Wave
Topic: Top Ten frequencies to monitor for TA reception?
Replies: 3
Views: 162

Re: Top Ten frequencies to monitor for TA reception?

Thanks John I gave it a try from 0200 - 0800 on 24th. I selected 10 frequencies to monitor on the SDR console matrix and used screen capture to take a screenshot every 30 seconds. It took about 5 minutes to playback 2 hours of screenshots. This showed at best very weak carriers on a couple of freque...
by daveB
24 Nov 2017 22:59
Forum: EMC (Interference) Issues
Topic: RSGB react to ofcoms lies about VDSL qrm
Replies: 2
Views: 347

Re: RSGB react to ofcoms lies about VDSL qrm

Aarrgghh! Good thing I hardly touch HF - and definitely no incentive to invest any time/money. I don't know if the interference spreads all the way into MW - but this is what I get on HF. Broadband interference.jpg [I was only checking this out in the previous week as part of chasing down the other ...
by daveB
24 Nov 2017 22:17
Forum: EMC (Interference) Issues
Topic: New Interference Source
Replies: 2
Views: 116

Re: New Interference Source

It's the car!! When there is no interference I check for the car - it is not there. When it is there I have interference. But the car was away for over a day and when it came back I had a single strong signal around 89.0. Went out with the portable and it showed 67 dB about 1 m from the rear - so cu...
by daveB
23 Nov 2017 21:01
Forum: Medium Wave & Long Wave
Topic: Top Ten frequencies to monitor for TA reception?
Replies: 3
Views: 162

Top Ten frequencies to monitor for TA reception?

My aerial is probably useless for MW DXing as it is only a short dipole cut for 70 MHz fed by about 10 m of coax. However I'm playing with SDR Console v3 which allows multiple VFO's to be displayed in a matrix and I can comfortably display 10 frequencies simultaneously. Using a 2 MHz bandwidth the C...
by daveB
18 Nov 2017 18:49
Forum: EMC (Interference) Issues
Topic: New Interference Source
Replies: 2
Views: 116

New Interference Source

This screen shot shows the interference plaguing my reception at the bottom of the FM Band - it appeared at the beginning of November and apart from a few breaks appeared to be 24/7. (This is in addition to the solar light interference after dusk). 89MHz severe interference.jpg I was able to establi...
by daveB
11 Nov 2017 15:38
Forum: DAB
Topic: DAB Portables Review
Replies: 6
Views: 2563

Re: DAB Portables Review

Does the Roberts Play actually have an external antenna jack? The picture of the rear shows something on the top right hand side marked ANT but I can't make out if the silvery metal thing is actually an aerial socket or is blanked off.
by daveB
11 Nov 2017 15:08
Forum: DAB
Topic: DABPlayer Install problem
Replies: 0
Views: 58

DABPlayer Install problem

Some time back I un-installed DABPlayer software from my Win 10 PC. Now when I try to re-install it I can't get it to work. The RTL stick is an R820T type. With the RTL stick plugged in: I've tried using Treiber 2 to install the correct driver - if there is an existing driver it deletes it and then ...

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