1476 kHz LP AM

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Julian Hardstone
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1476 kHz LP AM

Post by Julian Hardstone » 09 Nov 2018 01:01

From rsgb_lf_group:

"After the sad demise of all LW and MW broadcasts in Germany, a handful of pioneers came up who are operating legal low-powered medium wave stations in the context of a radio museum or for educational purposes. One of them is Ralph (DL2NDO, one of the participants in the legendary Donebach 137 kHz activation in 2002). He has obtained a transmitting license for 1476 kHz (former frequency of Vienna Bisamberg), built a 3 Watt AM transmitter, and with the help of a small team raised a quarterwave antenna on the Fraunhofer premises south of Erlangen (JN59MN21HF).

Yesterday they got on air for the first time, running a preliminary test transmission consisting of a switched 1000 Hz beeps (one second on, one second off, audio frequency locked to the RF carrier). This pattern will be continued for a few days, before they will eventually.take over the audio from the local DAB student radio "funklust".

The current test pattern is relatively easy to make out in the noise so it may be a good chance for some DX detections. At night we've actually heard the beeps on Twente SDR and a couple of German Kiwi-SDRs. But I guess using narrowband signal processing techniques, the carrier and coherent tones coud make it much further. The carrier frequency is derived from an OCXO and is currently at 1476000.411 Hz.

Will anyone in the group take the challenge?

Best 73,
Markus (DF6NM) "

AMDXHUN
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Re: 1476 kHz LP AM

Post by AMDXHUN » 09 Nov 2018 09:01

I will check it tonight!

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Julian Hardstone
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Re: 1476 kHz LP AM

Post by Julian Hardstone » 10 Nov 2018 23:07

The LF enthusiast amateurs have picked up the challenge to detect this 10W tx, using the full range of techniques for weak-signal detection. The DLs had no problem, then at night the Gs, GMs and EIs saw it, then by gray-line someone in Virginia, then a PP (Brazil) who could see the 1sec pulses on a waterfall display. Wish I could see anything below the S9 noise here :(

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John Faulkner, Skegness
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Re: 1476 kHz LP AM

Post by John Faulkner, Skegness » 10 Nov 2018 23:20

Not detected here in Skegness, so far.

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KnobTwiddler
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Re: 1476 kHz LP AM

Post by KnobTwiddler » 11 Nov 2018 02:42

I can't believe that I got this here in London on my crap setup, the aerial is just a home brew 9:1 BALUN and a helical wound whip about 3ft long. :o

Here is the audio - https://we.tl/t-axfO6C6cZw
Here is a screen grab of my SDR, you can see the bleeps on the audio waterfall at the bottom - http://i68.tinypic.com/1zn7ubq.jpg
AirSpy HF+ SDR + Full-wave Loop for FM + Home-brew Mini Whip for LW/MW/HF or 9:1 Balun + Whip Aerial
Yamaha T-D500 Tuner For DAB - Alinco DX-R8 Comms Rx - Tecsun PL-880 & ICR-110
Yaesu FT-897D - Icom IC-2200H - Anytone AT-588 for 70Mhz

AMDXHUN
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Re: 1476 kHz LP AM

Post by AMDXHUN » 11 Nov 2018 17:47

IRIB Kordestan and Egypt dominating this channel here. :(

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John Faulkner, Skegness
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Re: 1476 kHz LP AM

Post by John Faulkner, Skegness » 11 Nov 2018 18:35

I am just receiving this at 'painfully weak' level.

My flag is pointing away from Germany, but it is not fully optimised at the moment as I have it positioned and 'tuned' it to eliminate noise, rather than to eliminate signals coming in from the rear.

Nice to hear this! No doubt it would be much stronger if I pointed the flag towards Germany.

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John Faulkner, Skegness
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Re: 1476 kHz LP AM

Post by John Faulkner, Skegness » 11 Nov 2018 18:47

Turning the flag to point into Germany, I can hear the German tones much more reliably, but they are still extremely weak. Iran is dominating, unsurprisingly.

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Julian Hardstone
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Re: 1476 kHz LP AM

Post by Julian Hardstone » 11 Nov 2018 23:51

@KT, that is excellent reception for a city location! Is that really an 8Hz beat, or is it an artefact of the recording?

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Re: 1476 kHz LP AM

Post by Julian Hardstone » 12 Nov 2018 17:30

Tx has ceased this afternoon but will return with music px in a couple of weeks, probably with slow carrier frequency modulation to assist weak-signal identification.

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PFM907
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Re: 1476 kHz LP AM

Post by PFM907 » 19 Nov 2018 22:16

just wanted to point out after having heard ASFALTTELEGRAFENS test transmission few days ago which is also on this frequency (regular broadcast will be around Christmas holidays) that this station from Boraas Sweden does in fact also have a 2 min. test tone before signing on with music. however, the announcement in english language could be heard as well. The other one has test tone only, no musical px or any other content as far as i know.

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KnobTwiddler
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Re: 1476 kHz LP AM

Post by KnobTwiddler » 23 Nov 2018 00:57

Julian Hardstone wrote:
11 Nov 2018 23:51
@KT, that is excellent reception for a city location! Is that really an 8Hz beat, or is it an artefact of the recording?
Sorry for the delay in replying to your post Julian, I'm not sure want you mean by a 8Hz beat on the recording.
I am not an expert with SDR's, but if you are saying that it was off tune by 8Hz then that is entirely possible with the ECSS mode that I was using because I didn't have the AFC switched on.

I was very lucky to receive the signal, I found out later that there was engineering work that night on my local Railway, so the power had been switched off which resulted in a much lower noise floor. I doubt that I would have heard it if the power had been on, also I couldn't hear the signal on my Mini Whip due to the S/N ratio being worse, but they are well known for being noise magnets.

Regards
KT.
AirSpy HF+ SDR + Full-wave Loop for FM + Home-brew Mini Whip for LW/MW/HF or 9:1 Balun + Whip Aerial
Yamaha T-D500 Tuner For DAB - Alinco DX-R8 Comms Rx - Tecsun PL-880 & ICR-110
Yaesu FT-897D - Icom IC-2200H - Anytone AT-588 for 70Mhz

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