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Re: LF: WSPR MF please

To: [email protected]
Subject: Re: LF: WSPR MF please
From: DK7FC <[email protected]>
Date: Mon, 09 Feb 2015 00:13:23 +0100
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Hi Edgar,

Am 08.02.2015 23:39, schrieb edgar:
Hi Stefan,

Do both sites use the same type of receiver?
Yes, nearly identical.

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 :-)

And do they have the same receiving band width?
Yes they do.

73, Stefan

Regards, Edgar
Moonah, Tasmania.
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