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From: "James Moritz" <james.moritz@btopenworld.com>
To: <rsgb_lf_group@blacksheep.org>
References: <1245582735.4291.6.camel@gerhard-laptop> <33D6A4990B7B45149663D84D52C052CA@JimPC> <1245595125.3782.14.camel@gerhard-laptop>  <4A3E7EE4.9060209@a1.net> <1245612298.13715.100.camel@gerhard-desktop> <4545BAC9D97544A7A487534566391CD7@JimPC> <1245618472.13715.111.camel@gerhard-desktop> <A28258B3DCF24602AC02E2D771E86C77@JimPC> <3DA6235AEC4C4D5F918803BF8E4B64C5@Black>
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Date: Tue, 23 Jun 2009 21:07:29 +0100
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Subject: Re: LF: Re: 137khz RX-Test
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Dear Markus, LF Group,

Thanks for the screen shot from Sunday night

> The appended clip shows four of your sequence repetitions, as seen in a 
> high resolution 21 mHz FFT - of course not readable but
> still showing consecutive dashes as a line in the upper trace and a gap in 
> the lower one. The emission appears to be phase coherent
> across symbols of the same type, but not across frequency switching. 
> Apparently the shift does not happen to be an exact integer
> multiple of the symbol rate, and after returning to the original frequency 
> the phase has lapsed by some amount.
>

The DFCW was generated, via sound-card output and transverter, by DL4YHF's 
Spectrum Lab "Digimode Terminal", set to 0.2 symbols/s and 2Hz shift. I 
think that would make some of the inter-symbol spaces 2.5s, so not an exact 
multiple of 0.2s maybe? I guess Wolf could confirm exactly how the phase is 
determined...

Cheers, Jim Moritz
73 de M0BMU