Hi Stefan,
what is the impedance of your RX input?
73
Clemens
DL4RAJ
>-----Original Message-----
>From: [email protected]
>[mailto:[email protected]] On Behalf Of DK7FC
>Sent: Monday, February 09, 2015 12:13 AM
>To: [email protected]
>Subject: Re: LF: WSPR MF please
>There's just one thing: The T antenna in the garden is
>resonated and matched to 50 Ohm. However i forgot to connect a
>50 Ohm terminating resistor to the RX input. Probably the
>matched antenna does not act as a perfect bandpass for all
>frequecies and maybe there's a standing wave on the 20m long
>coax cable, resulting in a high input voltage in the HF or
>lower VHF range?
>
>The band noise was about 15...17 dB above the RX noise so
>there is some space. I will repeat the test and will use a 50
>Ohm terminating resistor. I don't expect much difference but anyway :-)
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