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Author Topic: BBC Clashes with itself on 12096.68 kHz? Twente WebSDR Receiver  (Read 7703 times)

Offline 4405486

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     Giving credit where credit is due, the work of RW observer and his number stations observation using the Twente WebSDR Receiver motivated me to go tinker with this site again. Presently there are over 60 receiver sites available at WebSDR.org.

     Of particular interest is the Twente general coverage Receiver of from 0-29.6 kHZ Not only do you get a high performance receiver, the chat box feature also enhances the experience (so far).

     At about 00:30 utc the BBC was observed on 12096.68 kHZ with a strong echo. This echo stimulated considerable speculation and comment given the propagation conditions which were poor for DX at the time. At about 01:00 BBC Signature Interval Signal was observed co-channel with male presenter. Promptly at sign off, interference Echo and interval signal vanished and the typical broadcast continued. Apparently some sort of BBC scheduling difficulty? I was a Deutsche Welle Technical Monitor back in the day and don't recall DW ever causing interference to itself? This may be a first, at least it is for me. It should be noted that my times are for illustration purposes as my comments scrolled off the Chat box feature and I am working from memory

     In addition, it should be noted that there are several interesting novelty receivers at this site such as K6FRC's 10 meter beacon Receiver and the receiver in Dresden designed to observe Cube SAT's as the tumble around in low orbit. I did not have any such luck picking up a Cube Sat (Shoe boxes in space program) but I had fun anyway.
 
     I really like the waterfall displays a lot more than analog or digital. Have fun with that.
« Last Edit: December 12, 2013, 0351 UTC by 4405486 »

Offline glimmer twin

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Re: BBC Clashes with itself on 12096.68 kHz? Twente WebSDR Receiver
« Reply #1 on: December 12, 2013, 0518 UTC »
12096.68 seems an odd frequency. I suspect you were hearing 12095. At that hour it is from Kranji, Singapore (00:00 to 02:00 utc) beamed 320 degrees seemingly ideal for multi-path reception in Europe. I had been listening via Twente a few hours earlier & found DX conditions to be pretty good.  Maybe BBC just screwed up. I thought they used the BBC interval signal on the Wooferton transmissions & the Babcock interval signal on the relay stations. Are those the same? I've seen reference to "Babcock interval signal" & thought it was different from the three note B-B-C. one.

Also note that BBC added some frequency/hours last Friday,12095 among them.

http://www.hfcc.org/data/schedbybrc.php?seas=B13&broadc=BBC
« Last Edit: December 12, 2013, 1408 UTC by glimmer twin »
KCMO  Icom R 75 , SDR-IQ, Grundig Satellit 750 ,Tecsun PL 880, Tecsun PL660 , Tecsun PL380 & PL360  10 meter random wire  w/ RF systems MLB    Alpha Delta SWL DX sloper  
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Offline Echo_One

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Re: BBC Clashes with itself on 12096.68 kHz? Twente WebSDR Receiver
« Reply #2 on: December 12, 2013, 1611 UTC »
    Giving credit where credit is due, the work of RW observer and his number stations observation using the Twente WebSDR Receiver motivated me to go tinker with this site again. Presently there are over 60 receiver sites available at WebSDR.org.

     Of particular interest is the Twente general coverage Receiver of from 0-29.6 kHZ Not only do you get a high performance receiver, the chat box feature also enhances the experience (so far).

Ah, I have a fondness for that site myself. I say that because I am on nearly every day - all day!!! PA3FWM has done a great job with the website, and there is always a great number of regulars there to chat to.

By what name do you go under there?
Echo One - Bringing An English Eccentricity To The Air Waves

reportecho1@gmail.com

Offline glimmer twin

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Re: BBC Clashes with itself on 12096.68 kHz? Twente WebSDR Receiver
« Reply #3 on: December 13, 2013, 0306 UTC »
I noted today that BBC was severely echoing due to them using 2 transmitters to Africa. They are adding new service to Africa daily it seems.

kHz, UTC, Site, Target zones

- Starting 5 Dec 2013:
12095 1500-2000 WOF (ex SEY) 48SW,53NW
15420 1400-1500 WOF (ex SEY) 48

- Starting 6 Dec 2013:
12095 2200-2400 ASC 46
12095 2200-2400 ASC 47SW,52
15400 1100-1700 ASC 46
15420 0400-0800 DHA (ex SEY) 48SW,53NW
15420 2000-2100 SEY 48SW,53NW
17830 1100-1600 ASC 47SW,52
21470 1130-1400 SEY 48SW,53NW

- Starting 7 Dec 2013:
11810 2100-2200 ASC 47SW,52 Daily (ex Mo-Fr)
12095 2100-2200 ASC 46 Daily (ex Mo-Fr)
17640 0800-1100 SEY 48SW,53NW
17640 1100-1130 DHA 48SW,53NW
17830 0800-1100 ASC 47SW,52

- Starting 10 Dec 2013 (day of Mandela memorial in Jo'burg), marked
"3"=Tuesday, presumably only that day although registered until the end
of B13:
6195 SNG 0900-1100 SNG 46 [sic - Singapore for West Africa?? more
likely extension of East Asia service]
6195 0900-1100 SNG 51W,54
9740 0900-1100 SNG 43SE,44SW,49E
9740 0900-1100 SNG 51W,54
11895 0900-1100 NAK 43E,44
15285 0900-1100 SNG 43E,44
[The following marked daily, but presumably only for 10 Dec, time will
tell:]
15400 ASC 0800-1100 46

- Deletion as of 13 Dec 2013:
9560 0230-0300 DHA Hindi

via dxld
KCMO  Icom R 75 , SDR-IQ, Grundig Satellit 750 ,Tecsun PL 880, Tecsun PL660 , Tecsun PL380 & PL360  10 meter random wire  w/ RF systems MLB    Alpha Delta SWL DX sloper  
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Offline 4405486

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Re: BBC Clashes with itself on 12096.68 kHz? Twente WebSDR Receiver
« Reply #4 on: December 16, 2013, 2143 UTC »
glimmer twin:

     I must apologize for my lack of precision for which I could kick myself now as this is interesting or so it seems to me. The frequency should be 12095 kHz. I was reading off the display and did not want to budge the tuning!

     When I was using the Twente Receiver I did not find propagation on the higher frequencies particularly good. I did not observe any beacons on 14100 kHz the International beacon project. I thought 20m which I have some familiarity with was rather poor; not so 40m and below. Just my general impression I'm going by memory.

     The Two English Broadcasts were mirror images of one another until the Signature Interval signal at the top of the hour which left one Broadcast standing. I believe the BBC uses remote automated technical monitoring. Perhaps this apparent scheduling error makes the case for greater human involvement, or so it seems to me.

     You obviously are more familiar with the BBC than I am, therefore I defer to your expertise. I looked at two BBC schedules and could not even clearly decipher some of the abbreviations etc. I did note 12095 kHz Broadcasts from several locations. I did not note any evidence of an Aurora Flutter. I suppose I could print out one of those Azimuth Projection maps when I get around to it and reverse engineer this process.

     I believe thanks to your info it was a scheduling conflict at the beginning of the new period.