Message-ID: <50901F44.1030708@iup.uni-heidelberg.de>
Date: Tue, 30 Oct 2012 19:41:08 +0100
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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To: rsgb_lf_group@blacksheep.org
References: <8D468B5D9DCA4B6D90ED557E68BB66AF@White> <508F157E.9040108@iup.uni-heidelberg.de> <508FAB27.2050909@psk31.plus.com> <508FD677.2050807@iup.uni-heidelberg.de> <50900CFA.20906@psk31.plus.com>
In-Reply-To: <50900CFA.20906@psk31.plus.com>
Subject: Re: LF: JT9-1 and 2, echoes, waterfall
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Hi Eddie, LF,

I'm transmitting JT9-30 since 15 UTC, see 
http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_LF_DX_Grabber.html

Like yesterday i'm running my receiver down in the office on the Win7 
PC. However there are no decodes so far after 4 rounds. In the next 
round i want to shorten the antenna wire so the signal is some 20 dB 
lower. Maybe it has actually something to do with to strong signal levels.

Am 30.10.2012 18:23, schrieb g3zjo:
> [...]
>
> Non de-code checks done here today on JT9-2, it looks to me that your 
> TX / RX need to be stable over the 2min period to less than +- 0.78Hz, 
> pretty critical for rigs.
Maybe this is an issue, yes. The stability of my signal is that of the 
soundcard, which should be much better than 0.78 Hz in 30 minutes. 
However the receivers end must be taken in account as well, of course. 
If people are using a HF TRX, the overall drift may become critical. 
Maybe Joe can comment on that.

I'm going to transmit a last JT9-30 round for today, starting 19...19:30 
UTC, 137.44 kHz.

73, Stefan/DK7FC

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Hi Eddie, LF,<br>
<br>
I'm transmitting JT9-30 since 15 UTC, see
<a class="moz-txt-link-freetext" href="http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_LF_DX_Grabber.html">http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_LF_DX_Grabber.html</a><br>
<br>
Like yesterday i'm running my receiver down in the office on the Win7
PC. However there are no decodes so far after 4 rounds. In the next
round i want to shorten the antenna wire so the signal is some 20 dB
lower. Maybe it has actually something to do with to strong signal
levels.<br>
<br>
Am 30.10.2012 18:23, schrieb g3zjo:
<blockquote cite="mid:50900CFA.20906@psk31.plus.com" type="cite">
  <meta content="text/html; charset=ISO-8859-1"
 http-equiv="Content-Type">
[...]<br>
  <br>
Non de-code checks done here today on JT9-2, it looks to me that your
TX / RX need to be stable over the 2min period to less than +- 0.78Hz,
pretty critical for rigs.<br>
</blockquote>
Maybe this is an issue, yes. The stability of my signal is that of the
soundcard, which should be much better than 0.78 Hz in 30 minutes.
However the receivers end must be taken in account as well, of course.
If people are using a HF TRX, the overall drift may become critical.
Maybe Joe can comment on that.<br>
<br>
I'm going to transmit a last JT9-30 round for today, starting
19...19:30 UTC, 137.44 kHz.<br>
<br>
73, Stefan/DK7FC<br>
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