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Date: Fri, 05 Aug 2011 18:06:14 +0200
From: =?ISO-8859-15?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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Subject: Re: LF: 137 friday morning?
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Thank you Albert for coming in, also to Tony/HB9ASB.

I actually didn't expect much activity on a friday morning. But then 
clear signals from HB9 and PA. Very pleased about that! It was an easy 
copy, would have been no problem for a 2 hour QSO. One day we all should 
try to make up a common group, giving the key arround 4 or 6 persons :-)

When beeing outside in the forest this morning, the RX noise was just 5 
dB above the soundcards noise. So i need more gain. I tried the external 
preamp i built from M0BMUs design. It overloads the RX then, since DLF 
is to strong. Adding a 10 dB attenuator prevents overloading and rises 
the overall noise by 10 dB above the noise of the RX(without an antenna 
connected). Maybe this could improve things a bit more but a test signal 
was missed to that time.
Also i tried the M0BMU amp in combination with the IC706. The signals 
(DCF39, DLF, DCF49...) were strongly improved and no overloading occurs 
but there is still a lack of gain on that RX whith that antenna. There 
is no audible difference in the LF band when connecting/disconnecting 
the antenna. A larger antenna might help, such as the earth antenna 
(700m long wire, avrg height above GND = 6m). Haven't found the time to 
check this but next time i will install both antennas and a switch to 
directly compare both systems...

So, hear you again! :-)

73, Stefan/DK7FC


Am 05.08.2011 12:03, schrieb Albert:
> Hello Stefan,
>
> Tks CW QSO this morning @ 09:20 UTC from ur /p location, a couple of 
> times ur squelch gave a smal problem during the overs.
> In ur earlier QSO I could not copy HB9ASB hr and I expected Mal in the 
> pile up of calling stations but nada.
>
> 73, Albert PA0A
>
>