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Date: Tue, 12 Sep 2006 19:27:13 +0200
From: uwe-jannsen@versanet.de
To: rsgb_lf_group@blacksheep.org
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Subject: Re: LF: Big signal with hum...
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Zitat von markusvester@aol.com:

>
> Dear LF,
>
> the "big buzzer" is on again today... it's most certainly the EFR 
> transmitter at Budapest-Lakihegy, 135.6 kHz:
> http://maps.google.com/maps?f=3Dq&hl=3Dde&q=3D47+22+17+N,+19+00+22+E&ie=
=3DUTF8&z=3D18&ll=3D47.373866,19.004492&spn=3D0.003426,0.005488&t=3Dk&om=3D=
1
>
> Several times I could hear relatively weak sweep signals, probably 
> generated by a network analyzer used for antenna testing. Most of the 
> high power tests were apparently applying a continuous 010101 
> sequence at 202.55 baud FSK, causing the hum-like sidebands. Reducing 
> the receiver gain by 7 dB cleared up the severe overloading effects 
> on the LF grabber. This left a set of thin red lines spaced at 101 
> Hz, reaching up to about 136.7 kHz. However with real data, the 
> sidebands will smear out and clutter the lower half of the band 
> during the telegrams.
>
>
> Spectrum taken 06-09-11 6:41, 135.600 kHz at 1100 Hz.
>
> Assuming that we will have to live with this beast, I wonder if there 
> is a way to extract its teeth. A signal processing software could 
> decode the data, model the filter transfer function and estimate the 
> FSK transition times. Then one could generate a local replica of the 
> signal, and use that to cancel it. Seems related to a key-click 
> filter algorithm ( http://www.dxatlas.com/Rocky/ ) - has anyone in 
> the group tried to implement something similar?
>
> Kind regards
> Markus, DF6NM
>
>
>
>
> -----Urspr=C3=BCngliche Mitteilung-----
> Von: nl9222@xs4all.nl
> An: rsgb_lf_group@blacksheep.org
> Verschickt: Sa., 9.Sept.2006, 11:47
> Thema: Re: LF: Big signal with hum...
>
>
> Dave G3WCB wrote:
>> Anybody else notice the ghastly big signal with 50Hz hum bars on around
>> 135,500 kHz? It's been on and off all evening, and is on at the moment
>> (2250z)
>> > I thought it was local to me, but it also appears on Marcus's grabber =
:-(
>> > 73, Dave G3WCB IO91RM
>
> Dave and all
> The signal here was S9 + 50dB, "blackening" the whole band
> See images ... if they make it here
> Full band image still is on the grabber [time is in utc]
> http://www.xs4all.nl/~nl9222/136grab.htm
>
> Hopefully this device has been selfdestructed ;-)
> 73 de Ko, NL9222
>
>
>
>

Hi Markus and Ko,
was the station off today?
if so, I have a problem.
regards
Uwe/dj8wx