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The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Hi Gary, If, by chance, you have a screenshot of the SR detector (with the main tab and the tab with the 'scope', which shows the squared MSK baseband signal) I'd like to find out what went wrong there. Possibly just the maximum frequency error, which was to be preset to 5 ppm - possibly too critical if the sampling rate had not been pre-calibrated at least once. [...] Content analysis details: (-0.5 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [195.4.92.90 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (dl4yhf[at]freenet.de) -0.5 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: 81e655fcf3a8bdab256d37a53bc8dabb Subject: Re: LF: Re: 8.3 kHz Content-Type: multipart/alternative; boundary="------------080207040908030601040009" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.5 required=5.0 tests=HTML_20_30,HTML_MESSAGE autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false This is a multi-part message in MIME format. --------------080207040908030601040009 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Hi Gary, If, by chance, you have a screenshot of the SR detector (with the main tab and the tab with the 'scope', which shows the squared MSK baseband signal) I'd like to find out what went wrong there. Possibly just the maximum frequency error, which was to be preset to 5 ppm - possibly too critical if the sampling rate had not been pre-calibrated at least once. 73, Wolf DL4YHF (just back from DF0WD after testing new switching-mode 'linear' PA on MF; there is lightning just overhead...) Am 03.01.2014 17:53, schrieb Gary - G4WGT: > Marcus, LF, > > Ref : My split 8270Hz & 8970Hz grabber. > I had difficulty getting the sample rate detector running, getting > message frequency too far off or similar, SL version v2.79 b04. > I gave up in the end & re-started using an older version of SL (which > I have no problem with) & is detecting MSK reference OK, SL version > v2.78 b05. > *73, de Gary - G4WGT > > MF-LF-VLF Grabber :http://myweb.tiscali.co.uk/wgtaylor/grabber2.html > Web :http://myweb.tiscali.co.uk/wgtaylor/index.html* > > . > On 03/01/2014 13:27, Markus Vester wrote: >> Gary >> great, thanks for pointing this out. I really like that side-by-side >> comparison. Assuming you are using nonresonant input circuitry and >> equal brightness settings, 8.27 kHz seems a tad noisier than 8.97. >> But it looks like 8270 is least QRM free. >> Best 73, >> Markus (DF6NM) >> >> *From:* Gary - G4WGT >> *Sent:* Friday, January 03, 2014 2:15 PM >> *To:* rsgb_lf_group@blacksheep.org >> *Subject:* Re: LF: Re: 8.3 kHz >> >> Peter, LF etc, >> >> I have also opened a split screen grabber looking at 8970Hz & 8270Hz >> to compare the noise levels etc. >> You can access the grabber at my main grabber by a link "Go to Sub >> 9kHz" :- >> >> http://myweb.tiscali.co.uk/wgtaylor/grabber2.html >> >> Or its own dedicated page :- >> >> http://myweb.tiscali.co.uk/wgtaylor/Sub9kHz.html >> >> 73, de Gary - G4WGT >> >> PA1SDB, Peter wrote: >>> My grabber at 8270 is loading. Lets see what QRM does here between >>> 8234 and 8305 Hz >>> www.qsl.net/pa1sdb >>> (did just start it at 23h00) >>> >>> ----- Original Message ----- >>> *From:* Markus Vester >>> *To:* rsgb_lf_group@blacksheep.org >>> >>> *Sent:* Thursday, January 02, 2014 1:12 PM >>> *Subject:* VLF: 8.3 kHz >>> >>> Sorry, first email was corrupted because I had forgotten to fill >>> in the subject line. 73, Markus >>> >>> >>> -----Ursprüngliche Mitteilung----- >>> Von: Markus Vester >> > >>> An: rsgb_lf_group >> > >>> Verschickt: Do, 2 Jan 2014 2:07 pm >>> >>> Dear Sub-9kHz'ers, >>> Marco DD7PC just made me aware of new German regulations, which >>> also includes a change of the unallocated VLF range. The latest >>> version of the "Freqenzverordnung" (FreqV) >>> http://www.gesetze-im-internet.de/bundesrecht/freqv/gesamt.pdf >>> has become effective already on August 27, 2013, and includes an >>> allocation of 8.3 to 9 kHz to the passive weather observing >>> service (ie. lightning locator networks). Strictly speaking, >>> this would make 8.97 kHz transmissions illegal in Germany >>> (although there may be a loophole with national footnote 2 >>> regarding "Induktionsfunkanlagen"). If I recall right, a similar >>> legal change in the UK had been announced in this group some >>> time ago, leading to the installation of some grabber windows >>> around 8.27 kHz. >>> In practice, radiated powers achievable by amateurs (milliwatts >>> at best) are ten orders of magnitudes below to that emitted by >>> lightning events (100 megawatts). The chance of amateur >>> interference to a broadband lightning locator would thus be >>> absolutely neglegible. Even if somebody happened to activate his >>> kite within one kilometer from a detector station, any further >>> effect of interference would still be suppressed by redundancy >>> in the lightning location network. >>> Still, for publicly visible work (like claiming first contacts >>> etc), we should consider moving below 8.3 kHz. Of course there >>> are disadvantages, like >>> - local interference eg. from railway lines seems to be much >>> denser and stronger at lower frequency, >>> - at same antenna voltage, radiated power will be 1.4 dB less, >>> - more coil winding is required, >>> - acoustical side-effect of transmitting may be more disturbing, >>> ... es nervt einfach!! >>> But then, one should always embrace change... positive aspects >>> may be >>> - lower QRN background in quiet locations, >>> - with common international legislation, the necessity of >>> sub-9kHz NOV's in the UK might become obsolescent, >>> - EA5HVK might be motivated to provide an Opera version with >>> flexible frequency assignment. >>> In my location, I am mostly affected by 16.67 / 33.3 Hz >>> modulated interference emitted by railway overhead lines, in >>> addition to the usual 50 Hz related junk. To possibly identify a >>> sweet spot with relatively low interference, I have temporarily >>> shifted the frequency range of my faster VLF grabber windows: >>> http://df6nm.darc.de/vlf/vlfgrabber.htm >>> Judging by the first hours, near 8280 Hz may be significantly >>> better than 8270. But interference comes and goes with time, so >>> longer observations are needed. Note that the heavy interference >>> between 11 and 12 UT could have been exacerbated by my noise >>> blanker settings as it is much less severe in the wideband >>> window. At this time, I would like to encourage other receiver >>> operators to closely investigate their noise levels just below >>> 8.3 kHz. >>> >>> Best 73, >>> Markus (DF6NM) >>> >>> No virus found in this message. >>> Checked by AVG - www.avg.com >>> Version: 2014.0.4259 / Virus Database: 3658/6971 - Release Date: >>> 01/02/14 >>> >> >> No virus found in this message. >> Checked by AVG - www.avg.com >> Version: 2014.0.4259 / Virus Database: 3658/6971 - Release Date: 01/02/14 >> > --------------080207040908030601040009 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit
Hi Gary,

If, by chance, you have a screenshot of the SR detector (with the main tab and the tab with the 'scope', which shows the squared MSK baseband signal) I'd like to find out what went wrong there. Possibly just the maximum frequency error, which was to be preset to 5 ppm - possibly too critical if the sampling rate had not been pre-calibrated at least once.

73,
  Wolf DL4YHF (just back from DF0WD after testing new switching-mode 'linear' PA on MF; there is lightning just overhead...)

Am 03.01.2014 17:53, schrieb Gary - G4WGT:
Marcus, LF,

Ref : My split 8270Hz & 8970Hz grabber.
I had difficulty getting the sample rate detector running, getting message frequency too far off or similar, SL version v2.79 b04.
I gave up in the end & re-started using an older version of SL (which I have no problem with) & is detecting MSK reference OK, SL version v2.78 b05.
73, de Gary - G4WGT
                            
MF-LF-VLF Grabber : http://myweb.tiscali.co.uk/wgtaylor/grabber2.html
Web : http://myweb.tiscali.co.uk/wgtaylor/index.html

.
On 03/01/2014 13:27, Markus Vester wrote:
Gary
 
great, thanks for pointing this out. I really like that side-by-side comparison. Assuming you are using nonresonant input circuitry and equal brightness settings, 8.27 kHz seems a tad noisier than 8.97. But it looks like 8270 is least QRM free.
 
Best 73,
Markus (DF6NM)

Sent: Friday, January 03, 2014 2:15 PM
Subject: Re: LF: Re: 8.3 kHz

Peter, LF etc,

I have also opened a split screen grabber looking at 8970Hz & 8270Hz to compare the noise levels etc.
You can access the grabber at my main grabber by a link "Go to Sub 9kHz" :-

http://myweb.tiscali.co.uk/wgtaylor/grabber2.html

Or its own dedicated page :-

http://myweb.tiscali.co.uk/wgtaylor/Sub9kHz.html

73, de Gary - G4WGT

PA1SDB, Peter wrote:
My grabber at 8270 is loading. Lets see what QRM does here between 8234 and 8305 Hz
 
(did just start it at 23h00)
 
 
 
 
----- Original Message -----
Sent: Thursday, January 02, 2014 1:12 PM
Subject: VLF: 8.3 kHz

Sorry, first email was corrupted because I had forgotten to fill in the subject line. 73, Markus


-----Ursprüngliche Mitteilung-----
Von: Markus Vester <markusvester@aol.com>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Do, 2 Jan 2014 2:07 pm

Dear Sub-9kHz'ers,
 
Marco DD7PC just made me aware of new German regulations, which also includes a change of the unallocated VLF range. The latest version of the "Freqenzverordnung" (FreqV)
http://www.gesetze-im-internet.de/bundesrecht/freqv/gesamt.pdf
has become effective already on August 27, 2013, and includes an allocation of 8.3 to 9 kHz to the passive weather observing service (ie. lightning locator networks). Strictly speaking, this would make 8.97 kHz transmissions illegal in Germany (although there may be a loophole with national footnote 2 regarding "Induktionsfunkanlagen"). If I recall right, a similar legal change in the UK had been announced in this group some time ago, leading to the installation of some grabber windows around 8.27 kHz.
 
In practice, radiated powers achievable by amateurs (milliwatts at best) are ten orders of magnitudes below to that emitted by lightning events (100 megawatts). The chance of amateur interference to a broadband lightning locator would thus be absolutely neglegible. Even if somebody happened to activate his kite within one kilometer from a detector station, any further effect of interference would still be suppressed by redundancy in the lightning location network.
 
Still, for publicly visible work (like claiming first contacts etc), we should consider moving below 8.3 kHz. Of course there are disadvantages, like
- local interference eg. from railway lines seems to be much denser and stronger at lower frequency,
- at same antenna voltage, radiated power will be 1.4 dB less,
- more coil winding is required,
- acoustical side-effect of transmitting may be more disturbing,
... es nervt einfach!!
 
But then, one should always embrace change... positive aspects may be
- lower QRN background in quiet locations,
- with common international legislation, the necessity of sub-9kHz NOV's in the UK might become obsolescent,
- EA5HVK might be motivated to provide an Opera version with flexible frequency assignment.
 
In my location, I am mostly affected by 16.67 / 33.3 Hz modulated interference emitted by railway overhead lines, in addition to the usual 50 Hz related junk. To possibly identify a sweet spot with relatively low interference, I have temporarily shifted the frequency range of my faster VLF grabber windows:
http://df6nm.darc.de/vlf/vlfgrabber.htm
Judging by the first hours, near 8280 Hz may be significantly better than 8270. But interference comes and goes with time, so longer observations are needed. Note that the heavy interference between 11 and 12 UT could have been exacerbated by my noise blanker settings as it is much less severe in the wideband window. At this time, I would like to encourage other receiver operators to closely investigate their noise levels just below 8.3 kHz.
 
Best 73,
Markus (DF6NM)

 

No virus found in this message.
Checked by AVG - www.avg.com
Version: 2014.0.4259 / Virus Database: 3658/6971 - Release Date: 01/02/14


No virus found in this message.
Checked by AVG - www.avg.com
Version: 2014.0.4259 / Virus Database: 3658/6971 - Release Date: 01/02/14



--------------080207040908030601040009--