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
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