From: DK7FC <73dk7fc@googlemail.com>
Message-ID: <54AEFC66.6030206@gmail.com>
Date: Thu, 08 Jan 2015 22:53:42 +0100
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To: rsgb_lf_group@blacksheep.org
References: <46D2E1AF22D14849AD1095081F7613AB@AGB>, <FE2CD976237848008CB5F84E8291A688@AGB>, <54AD702F.1009.1A52347@mike.dennison.ntlworld.com> <54AE61EB.7134.397DF4@mike.dennison.ntlworld.com> <C78AA868025844D1AA86642B40F70DEC@AGB> <000c01d02b55$440817e0$6401a8c0@JAYDELL> <54AEEDCE.6000302@gmail.com> <DE31AC6A229948608DAFE7B5FC879079@White>
In-Reply-To: <DE31AC6A229948608DAFE7B5FC879079@White>
Subject: Re: LF: Lines in the DK7FC opds window
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Hi Markus,

Hmm, a mystery :-)
Actually the band pass filters should not pass a signicicant strength of 
DCF77. And the 10 kHz Ref signal is at -36 dB f.s., i.e. not overloading 
anything. Maybe it is a rest of the LO signal (125 kHz) reaching the ADC 
input? There is a LPF after the mixer though...
I don't know. I could switch OFF the LO and see if the lines disapper, HI.

73, Stefan

Am 08.01.2015 22:31, schrieb Markus Vester:
> Hi Stefan,
> just took a close look and noticed the 1 Hz spaced lines around 137.5 
> kHz. They appear to be a replica of the DCF77 timecode, including 
> the minima at +-10 Hz corresponding to the 100 ms carrier gaps. Have 
> you tried listening on this frequency? There must be some combination 
> producing either the RF frequency (eg. 60 + 77.5 = 137.5 kHz) or your 
> IF (12.5 kHz), perhaps including multiples of the 10 kHz GPS 
> reference. I just cant point my finger exactly on how it happens.
> Best 73,
> Markus
>
> *From:* DK7FC <mailto:73dk7fc@googlemail.com>
> *Sent:* Thursday, January 08, 2015 9:51 PM
> *To:* rsgb_lf_group@blacksheep.org <mailto:rsgb_lf_group@blacksheep.org>
> *Subject:* LF: Old version OPERA >> ''Opera Fixed'' <<
>
> Hi Jay,
>
> You have been on air last night in OP32? Unfortunately i got no decode.
> I guess it could be due to the local QRM which is still high in this
> location. My LF DX grabber shown the RX window looking dramatic in
> 424uHz and with AGC.
> If you continue to TX this night maybe, would you like to try a
> frequency which is clean on my side?
> Would like to get a decode from you, to reduce the ratio (FC received by
> XNS) / (XNS received by FC)
> :-)
>
> 73, Stefan
>
>

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Hi Markus, <br>
<br>
Hmm, a mystery :-)<br>
Actually the band pass filters should not pass a signicicant strength
of DCF77. And the 10 kHz Ref signal is at -36 dB f.s., i.e. not
overloading anything. Maybe it is a rest of the LO signal (125 kHz)
reaching the ADC input? There is a LPF after the mixer though...<br>
I don't know. I could switch OFF the LO and see if the lines disapper,
HI.<br>
<br>
73, Stefan<br>
<br>
Am 08.01.2015 22:31, schrieb Markus Vester:
<blockquote cite="mid:DE31AC6A229948608DAFE7B5FC879079@White"
 type="cite">
  <meta content="text/html; charset=ISO-8859-1"
 http-equiv="Content-Type">
  <meta name="GENERATOR" content="MSHTML 8.00.6001.23588">
  <div><font face="Arial" size="2">Hi Stefan, </font></div>
  <div>&nbsp;</div>
  <div><font face="Arial" size="2">just took a close look and noticed
the 1 Hz spaced lines&nbsp;around 137.5 kHz. They&nbsp;appear to be&nbsp;a replica of
the&nbsp;DCF77 timecode,&nbsp;including the&nbsp;minima at +-10 Hz corresponding
to&nbsp;the 100 ms carrier gaps. Have you tried listening on this frequency?
There must be&nbsp;some combination producing either the RF&nbsp;frequency (eg.
60 + 77.5 = 137.5 kHz) or your IF (12.5 kHz),&nbsp;perhaps including
multiples of the 10 kHz GPS reference.&nbsp;I&nbsp;just cant point my finger
exactly on how it happens.</font></div>
  <div>&nbsp;</div>
  <div><font face="Arial" size="2">Best 73,</font></div>
  <div><font face="Arial" size="2">Markus</font></div>
  <div>&nbsp;</div>
  <div>&nbsp;</div>
  <div><br>
  </div>
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 style="font-family: Tahoma; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none;">
  <div
 style="background: rgb(245, 245, 245) none repeat scroll 0% 0%; -moz-background-clip: border; -moz-background-origin: padding; -moz-background-inline-policy: continuous;">
  <div style=""><b>From:</b> <a moz-do-not-send="true"
 title="73dk7fc@googlemail.com" href="mailto:73dk7fc@googlemail.com">DK7FC</a>
  </div>
  <div><b>Sent:</b> Thursday, January 08, 2015 9:51 PM</div>
  <div><b>To:</b> <a moz-do-not-send="true"
 title="rsgb_lf_group@blacksheep.org"
 href="mailto:rsgb_lf_group@blacksheep.org">rsgb_lf_group@blacksheep.org</a>
  </div>
  <div><b>Subject:</b> LF: Old version OPERA &gt;&gt; ''Opera Fixed''
&lt;&lt;</div>
  </div>
  </div>
  <div><br>
  </div>
Hi Jay,<br>
  <br>
You have been on air last night in OP32? Unfortunately i got no decode.<br>
I guess it could be due to the local QRM which is still high in this <br>
location. My LF DX grabber shown the RX window looking dramatic in <br>
424uHz and with AGC.<br>
If you continue to TX this night maybe, would you like to try a <br>
frequency which is clean on my side?<br>
Would like to get a decode from you, to reduce the ratio (FC received
by <br>
XNS) / (XNS received by FC)<br>
:-)<br>
  <br>
73, Stefan<br>
  <br>
  <br>
</blockquote>
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