Return to KLUBNL.PL main page
| To: | "[email protected]" <[email protected]> |
|---|---|
| Subject: | Re: WOLF: 135975 Hz, 10 b/s again |
| From: | Andy - KU4XR <[email protected]> |
| Date: | Fri, 27 Jan 2012 17:58:17 -0800 (PST) |
| Dkim-signature: | v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s1024; t=1327715897; bh=zd3vG+/KCro2+5ttM7WYkzePkEVL/5E2UcWbkcd59+s=; h=X-YMail-OSG:Received:X-Mailer:References:Message-ID:Date:From:Reply-To:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=rFmSNIQZW+YgCsZycbtXu/qLNvMb5RdBy6xSOLiCasU6APXbvIeUlPdNVFxtibJAEiCxTvIwaDZBuvV1UQdn4cClBSF3vKmHBqYRl5hp7zahp8pJ/gYmJ9NpMkw8TZD47nPP9BSWP4tLoUCX4OC67be9McbSxXj7WCM8fGnWKB0= |
| Domainkey-signature: | a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=X-YMail-OSG:Received:X-Mailer:References:Message-ID:Date:From:Reply-To:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=rb9PdlDtwbIZu30pckwyS+ldkFFdzBqeI8fPAHnMAi1QeccmOx/v1LwY/Afk3N2OPT51yXHCElr/3usgnwf0nVOaXh1JI8/f6FzLCm+msV2oSZAk2D+S2BgSDSleZ2q5EzSon/HWxQR5BGaMmjsqfoMqagrxX11k+O1JrVJinEs=; |
| Domainkey-status: | good (testing) |
| In-reply-to: | <BE34C33F7C9A43EBA733603AE5AD6CFC@White> |
| References: | <3992CC59F7A14AA694628529761EC5DE@AGB> <[email protected]> <28E5D61E1299414C8AD335047F7EE837@White> <[email protected]> <[email protected]> <7667FF6C11E54298B5CAA2280D2B436C@White> <001201ccdcf9$70fbcf60$6d01a8c0@DELL4> <[email protected]> <BE34C33F7C9A43EBA733603AE5AD6CFC@White> |
| Reply-to: | [email protected] |
| Sender: | [email protected] |
|
Thank you Markus for the explanation of WOLF modulation. I never stop learning.... a good thing....
Now looking for you as of 01:45 UTC
Andy - KU4XR - EM75xr - Friendsville, TN. USA
Coordinates: N: 35º 43' 54" - W: 84º 3' 16" http://lwca.org/grabbers/ku4xr/ http://www.myspace.com/beaconxr http://ku4xr.webs.com http://lwca.org/community/YaBB.pl
From: Markus Vester <[email protected]> To: [email protected] Sent: Friday, January 27, 2012 6:01 PM Subject: Re: WOLF: 135975 Hz, 10 b/s again Hi Andy, LF,
actually there is no carrier line in the WOLF spectrum, it's BPSK with a pseudorandom spreading code. In a spectrogram it resembles a 10 Hz wide noise band, which will be pretty much undetectable at any DX range. Actually a kind of spread spectrum mode, not unlike the GPS modulation (pssst ;-).
I think I have proven (and resolved) my soundcard phase-glitch problem. The attached trace shows a local audio test, with a WOLF signal generated on 1475 Hz. It is doubled in SpecLab's AM demodulator to regenereate a carrier at twice the frequency, which is phase compared to an hardware generated Rb-derived reference carrier. I have employed SpecLab's RDF mode to display phase as colour (retarding R-G-B-R). The first half shows the result from WOLF-Gui running on my "Grabber Notebook", which has a number of programs running. Besides the gradual phase roll due too a very minor frequency offset, there are jumps every few minutes. This is a bit nasty, as Wolf will still decode such a signal when it is strong, but not be able to go to its full sensitivity by using long coherent integration. The right half after 21:40 shows the practically perfect output from the Atom
Netbook, the one which I have also used during several VLF transmissions.
So, maybe it's worth another try. Will put the "good" WOLF signal on air a few minutes after 23 UT, QRG 135975 Hz, 10 b/s.
Best 73,
Markus (DF6NM)
|
| Previous by Date: | Re: LF: Conds, Alan Melia |
|---|---|
| Next by Date: | Re: LF: OT: Headphones, John Bruce McCreath |
| Previous by Thread: | Re: WOLF: 135975 Hz, 10 b/s again, John Bruce McCreath |
| Next by Thread: | Re: WOLF: 135975 Hz, 10 b/s again, Markus Vester |
| Indexes: | [Date] [Thread] [Top] [All Lists] |