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Date: Thu, 30 Dec 2010 11:56:30 +0100
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <schaefer@iup.uni-heidelberg.de>
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Subject: Re: LF: "NM" on 136177.5
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Sorry Piotr,

I just discovered your locator in the capture text field.

73, Stefan

Am 30.12.2010 00:10, schrieb Piotr Mlynarski:
> Stefan Sch=E4fer pisze:
>> Hello Piotr,
>>
>> Nice to see that you enjoy the LF receptions :-) Generally its nice=20
>> to see new upcoming stations and a never ending interest in LF=20
>> operation. Soon, i will be one of the active TX stations with a fixed=
=20
>> antenna too. I am looking forward to this :-)
>>
>> 73, Stefan
>
> Hi Stefan,
>
> First of all i thank you for your response due to my LF reception=20
> reports. Sure, it does not happen very often as i live in a really=20
> hostile environment as far as  receiving long waves is concerned.
> Nevertheless, i do enjoy every single lf reception even if it is a=20
> very  'short'  distance ( according to 'standards'  established by =20
> current T/A observations, transpacific qso etc...) so i was really=20
> happy to see for the first time Markus,
> DF6NM and Gus, SM6BHZ  tx'ing in the EU   '177 window . I even managed=
=20
> to  set up LF grabber:   http://www.toya.net.pl/~mlynarski/  which i=20
> will be switching on ocasionally or upon request.
> you may regard this as a 'lower bound' of RX observations   i.e.   if=20
> something is seen on my grabber it means whole world is already=20
> watching this :)
> ( btw , abt 21 utc.. Markus started TX'ing as i can see veeeery weak=20
> traces at 136.1775 kHz )
> the distance to Markus is abt 640 km , to Gus abt 817 km so when you=20
> will be qrv on 137 frm  Heidelberg ( 801 km ) i am pretty sure that ,=20
> on statistical average, i will be in position to receive your signal,=20
> so likely,
> we may have a x-band qso on 137 kHz - it would be a great pleasure for=
=20
> me if this would have happened !
>
> on VLF issues.... just today, Ken, M0KHW asked you abt possible=20
> replacement of  bf862 jfet. i can confirm your answer that J310 also=20
> works in your VLF antenna  - i have already built it  and tested=20
> shortly during
> Christmas Eve  SAQ transmission  - it worked but i had too much qrm so=
=20
> i it had to be replaced by the loop which nulled some of the qrm. Of=20
> course, the placement of the antenna ( i.e. on my balkony)  was=20
> absolutely inappropriate but i did it only for checking purposes=20
> etc... i have also used your idea of separating  jfet along with 1M,=20
> 10M R's and 20nF cap into a waterproof box while placing the remaining=
=20
> parts in a separate box and  used abt 20 m of pair cable between.
> i am preparing for your next kite vlf experiment but this time i will=20
> be  /p station abt 10 km away  frm my qth  so  i will try to check if=20
> the numerical model of earth-ionosphere waveguide works in practice ..=
 :)
> i plan to use your VLF active antenna along with the SDR-IQ receiver .
> At this moment i have completely no idea how to make 'the calibration'=
=20
> of such setup in order to have the readouts comparable with some=20
> theoretical predictions
> but the 'long winter evenings',  hopefully, will provide some=20
> solutions  :)
>
>                                                             Yours,=20
> Piotr, sq7mpj
> qth: Lodz /jo91rs/
>
>
>
>