From: DK7FC <73dk7fc@googlemail.com>
Message-ID: <54D7ED93.3040904@gmail.com>
Date: Mon, 09 Feb 2015 00:13:23 +0100
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To: rsgb_lf_group@blacksheep.org
References: <ca41dbe9b82c4625904e9c5f5498b63b@kabelmail.de> <54D77171.6000107@gmail.com> <54D7E234.8080004@gmail.com> <54D7E5BB.4000407@virginbroadband.com.au>
In-Reply-To: <54D7E5BB.4000407@virginbroadband.com.au>
Subject: Re: LF: WSPR MF please
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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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Hi Edgar, <br>
<br>
Am 08.02.2015 23:39, schrieb edgar:
<blockquote cite="mid:54D7E5BB.4000407@virginbroadband.com.au"
 type="cite">
  <meta content="text/html; charset=windows-1252"
 http-equiv="Content-Type">
  <font face="Arial">Hi Stefan,<br>
  <br>
Do both sites use the same type of receiver?<br>
  </font></blockquote>
Yes, nearly identical.<br>
<br>
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?<br>
<br>
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 :-)<br>
<br>
<br>
<blockquote cite="mid:54D7E5BB.4000407@virginbroadband.com.au"
 type="cite"><font face="Arial"> And do they have the same receiving
band width?<br>
  </font></blockquote>
Yes they do.<br>
<br>
<br>
73, Stefan<br>
<br>
<br>
<blockquote cite="mid:54D7E5BB.4000407@virginbroadband.com.au"
 type="cite"><font face="Arial"> <br>
Regards, Edgar<br>
Moonah, Tasmania.<br>
  </font> </blockquote>
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