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Content preview: Oh no not again , another from the Hungarian phase book ! wspr is a data mode and qrss is a carrier detection system ... there needs to be round 8/10 dB more signal or 8/10 dB more sensitivity to be able to extract the modulation pay load at the RX .. and in the case of correlation , this is better as the 'pattern' is being matched , using a pre known pattern , but I think the standard CW pattern has only a few state changes , where the 256 blocks of another well known washing powder gives better results bur wspr uses 4fsk so its not possible to correlate , so that removes the other chances or decode at the ariel and detection when using on/off keying [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [80.12.242.80 listed in list.dnswl.org] 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: e5f33499c82e559d1cf2f25253946608 Subject: Re: LF: 74550 XRS in Germany Content-Type: multipart/alternative; boundary="----=_NextPart_000_00F7_01CEBD50.F4705940" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.5 required=5.0 tests=HTML_30_40,HTML_MESSAGE, HTML_TITLE_EMPTY,MISSING_OUTLOOK_NAME 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 Status: O X-Status: X-Keywords: X-UID: 1962 This is a multi-part message in MIME format. ------=_NextPart_000_00F7_01CEBD50.F4705940 Content-Type: text/plain; charset="ISO-8859-15" Content-Transfer-Encoding: quoted-printable Oh no not again , another from the Hungarian phase book ! wspr is a data mode and qrss is a carrier detection system = ... there needs to be round 8/10 dB more signal or 8/10 dB more = sensitivity to be able to extract the modulation pay load = at the RX .. and in the case of correlation , this is better = as the 'pattern' is being matched , using a pre known pattern = , but I think the standard CW pattern has only a few state changes = , where the 256 blocks of another well known washing powder = gives better results=20 bur wspr uses 4fsk so its not possible to correlate , so that = removes the other chances or decode at the ariel and detection = when using on/off keying=20 :_) =20 From: Stefan Sch=E4fer=20 Sent: Sunday, September 29, 2013 6:08 PM To: rsgb_lf_group@blacksheep.org=20 Subject: Re: LF: 74550 XRS in Germany PS: Even QRSS-60 is more promising than WSPR-15 for initial experiments. = So the simple modes are still the right way to go.=20 PPS: I find a small part of this quick success is also due to the = existence of this reflecor which helps to motivate active (RX or TX) = LF/MF/VLF radio amateurs to motivate each other :-) 73, Stefan Am 29.09.2013 18:55, schrieb Stefan Sch=E4fer:=20 Hello Bob and Hartmut,=20 My congratulation for that success. Both of you must have a very = suitable system to radiate respectively receive a signal on the 4000m = band!=20 Bob, can you transmit DFCW? If 4000m behaves reasonable like 2200m, = then DFCW-180 should be a good choice! It is a bit slower and may allow = reception of your signal even for station with lower RX sensitivity than = Hartmut offers. Also DFCW gives you a better ID since the frequency = shift is another indicator which separates your signal from random = QRM... 73, GL, Stefan/DK7FC Am 29.09.2013 10:23, schrieb Hartmut Wolff:=20 Bob,=20 the capture is a bit tiny, because I used a qrss 120 screen. Your = signal was drifting and you crossed the Loran line just before 04:00. = For the future a frequency 1 Hz lower would be better.=20 73=20 Hartmut=20 ------=_NextPart_000_00F7_01CEBD50.F4705940 Content-Type: text/html; charset="ISO-8859-15" Content-Transfer-Encoding: quoted-printable
Oh   no  not  again  , another  from=20 the  Hungarian phase  book  !
 
wspr is  a =20 data  mode  and =20 qrss  is  a  = carrier =20 detection   system  ... there  = needs =20 to  be  round  8/10 dB more  signal  or =20 8/10  dB more  sensitivity   to  be  = able =20 to  extract   the  modulation  pay  = load  at=20 the  RX   ..  and in the  case of  = correlation  ,=20 this  is  better  as  the   = 'pattern' =20 is  being   matched , using  a  pre  = known =20 pattern , but  I think the  standard CW pattern has only = a =20 few  state changes  , where  the  256  = blocks =20 of  another  well  known  washing powder  gives = better=20 results
bur  wspr  uses 4fsk   so  its  = not =20 possible  to  correlate  , so  that  = removes =20 the  other  chances or decode   at the =20  ariel  and detection  when using =20 on/off  keying
 
:_)

From: Stefan = Sch=E4fer
Sent: Sunday, September 29, 2013 6:08 PM
To: rsgb_lf_group@blacksheep.org= =20
Subject: Re: LF: 74550 XRS in Germany

PS: Even QRSS-60 is more promising than = WSPR-15=20 for initial experiments. So the simple modes are still the right way to = go.=20

PPS: I find a small part of this quick success is also due to = the=20 existence of this reflecor which helps to motivate active (RX or = TX)=20 LF/MF/VLF radio amateurs to motivate each other  :-)

73,=20 Stefan

Am 29.09.2013 18:55, schrieb Stefan Sch=E4fer:=20
Hello=20 Bob and Hartmut,

My congratulation for that success. Both of = you must=20 have a very suitable system to radiate respectively receive a signal = on the=20 4000m band!

Bob, can you transmit DFCW? If 4000m behaves = reasonable=20 like 2200m, then DFCW-180 should be a good choice! It is a bit = slower=20 and may allow reception of your signal even for station with lower RX=20 sensitivity than Hartmut offers. Also DFCW gives you a better ID since = the=20 frequency shift is another indicator which separates your signal from = random=20 QRM...

73, GL, Stefan/DK7FC


Am 29.09.2013 10:23, = schrieb=20 Hartmut Wolff:=20
Bob, =

the=20 capture is a bit tiny, because I used a qrss 120 screen. Your signal = was=20 drifting and you crossed the Loran line just before 04:00. For the = future a=20 frequency 1 Hz lower would be better.

73

Hartmut=20
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