Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dc03.r1000.mx.aol.com (Internet Inbound) with ESMTP id DE1DB38000088; Sun, 2 Oct 2011 09:41:48 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1RAMHg-00069a-8O for rs_out_1@blacksheep.org; Sun, 02 Oct 2011 14:40:48 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1RAMHf-00069R-NT for rsgb_lf_group@blacksheep.org; Sun, 02 Oct 2011 14:40:47 +0100 Received: from smtp5.freeserve.com ([193.252.22.128]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1RAMHc-0002Pv-NS for rsgb_lf_group@blacksheep.org; Sun, 02 Oct 2011 14:40:47 +0100 Received: from me-wanadoo.net (localhost [127.0.0.1]) by mwinf3407.me.freeserve.com (SMTP Server) with ESMTP id 23C7B1C00087 for ; Sun, 2 Oct 2011 15:40:39 +0200 (CEST) Received: from me-wanadoo.net (localhost [127.0.0.1]) by mwinf3407.me.freeserve.com (SMTP Server) with ESMTP id 169921C00088 for ; Sun, 2 Oct 2011 15:40:39 +0200 (CEST) Received: from AGB (unknown [2.26.46.95]) by mwinf3407.me.freeserve.com (SMTP Server) with SMTP id D43911C00087 for ; Sun, 2 Oct 2011 15:40:38 +0200 (CEST) X-ME-UUID: 20111002134038869.D43911C00087@mwinf3407.me.freeserve.com Message-ID: <346A212A8BE34F379EF56765B520C461@AGB> From: "Graham" To: References: In-Reply-To: Date: Sun, 2 Oct 2011 14:40:38 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 14.0.8117.416 X-MimeOLE: Produced By Microsoft MimeOLE V14.0.8117.416 X-Antivirus: avast! (VPS 111002-0, 02/10/2011), Outbound message X-Antivirus-Status: Clean X-Spam-Score: 0.2 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,RCVD_ILLEGAL_IP=0.234 Subject: Re: LF: A test of cmsk on 8.97kHz Content-Type: multipart/alternative; boundary="----=_NextPart_000_0088_01CC8111.40AABC20" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.9 required=5.0 tests=HTML_30_40,HTML_MESSAGE, 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 x-aol-global-disposition: G X-AOL-SCOLL-SCORE: 0:2:521847584:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d40834e886a1c254f X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none This is a multi-part message in MIME format. ------=_NextPart_000_0088_01CC8111.40AABC20 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I should add The MF / EME and 8Khz AUDIO-BAND modes are not Spread Spectrum = as defined by the FCC , and are similar to CMSK in deploying a = direct sequencing engine , the expected lowering of the minimum = detection threshold ,subsequently may be observed in both modes, =20 Reference may be made to this months Rad-Com Magazine Data coms = article , by Andy ...=20 G..=20 From: Graham=20 Sent: Sunday, October 02, 2011 12:19 PM To: rsgb_lf_group@blacksheep.org=20 Subject: LF: A test of cmsk on 8.97kHz=20 This was posted on the Digital mode group -yahoo- = http://groups.yahoo.com/group/digitalradio/message/40065 For those who can, the ROS direct drive 8 Khz sound card based = system , with optional X2 Tx frequency to compensate for class = e/d divide by 2 , is still available for use , details at :-=20 https://sites.google.com/site/uk500khz/ros-vlf---exe _________________________________________________________________________= _________________________________ A test of cmsk on 8.97kHz=20 Hi all, The last few days I've been doing some digi mode testing at 8.97 khz; "dreamers band", mostly with use of the QRSS mode. On the transmitter side, I have been using a 5 turn 10 x 10 m antenna and an audio amplifier 100W. The system is feeded with a signal from the program "Spectrum Lab". On the receiver side, I have been using a 70 x 70 cm 60 turns loop, tuned with a capacitor. The loop was connected to the microphone input on my laptop and decoded with "Spectrum Lab". The result has been interesting . With this simple arrangement, I have reach a distance of 2.5 km. Yesterday I tried out CMSK8 made by ZL1BPU Murray. I had to make some changes in the ini-file to get the CMSK work om 8.97khz. The sampling rate was adjusted with the program CheckSR and the transmitting frequency was set to 8970Hz. Waterfall has a 2000Hz limit so this was black and useless on 8790Hz. It would makes it easier to track the signal if the developer could extend waterfall to 10 kHz. Iam aware that one can get the view of the waterfall by going down in frequency, but 8.97khz has become a de facto water hole of VLF . The result was exciting. A clean copy of the signal was received at about 2 km. I would also try to test out some of the VLF mode in multipsk , especially PSK10 and PSKAM10, but I have not find a way to fool the program to work on 8.97Khz yet. 73 and good dx the VLF Steinar la5vna ------=_NextPart_000_0088_01CC8111.40AABC20 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
I should  add
 
The  MF / EME  = and   8Khz =20 AUDIO-BAND   modes  are  not  Spread Spectrum = as  =20 defined  by the  FCC  , and are  similar = to  CMSK=20 in deploying a  direct  sequencing  engine , the =20 expected  lowering  of the  minimum detection  = threshold=20 ,subsequently   may be observed in  both  modes,=20  
 
Reference   may  be made = to =20 this months  Rad-Com Magazine  Data  coms article  , = by  Andy ...
 
G..

From: Graham
Sent: Sunday, October 02, 2011 12:19 PM
Subject: LF: A test of cmsk on 8.97kHz

This  =20 was  posted on the Digital mode  group  = -yahoo-  =20 http://= groups.yahoo.com/group/digitalradio/message/40065
 
For  = those  who=20 can, the   ROS  direct  drive  8 Khz  = sound =20 card  based system ,   with  optional   = X2 =20 Tx  frequency  to compensate  for  class  = e/d =20 divide  by 2  , is still  available
for  = use  ,=20 details  at  :-
 
https://sit= es.google.com/site/uk500khz/ros-vlf---exe
 
 
____________________________________________________________= ______________________________________________
 
 
 
A test of cmsk on 8.97kHz


Hi=20 all,

The last few days I've been doing some digi mode testing at = 8.97=20 khz;
"dreamers band", mostly with use of the QRSS mode.

On the = transmitter side, I have been using a 5 turn 10 x 10 m antenna
and an = audio=20 amplifier 100W. The system is feeded with a signal from the
program = "Spectrum=20 Lab".

On the receiver side, I have been using a 70 x 70 cm 60 = turns=20 loop,
tuned with a capacitor. The loop was connected to the = microphone=20 input
on my laptop and decoded with "Spectrum Lab".

The result = has=20 been interesting . With this simple arrangement, I have
reach a = distance of=20 2.5 km.

Yesterday I tried out CMSK8 made by ZL1BPU Murray. I had = to make=20 some
changes in the ini-file to get the CMSK work om 8.97khz. The=20 sampling
rate was adjusted with the program CheckSR and the=20 transmitting
frequency was set to 8970Hz. Waterfall has a 2000Hz = limit so=20 this was
black and useless on 8790Hz.

It would makes it easier = to=20 track the signal if the developer could
extend waterfall to 10 kHz. = Iam aware=20 that one can get the view of the
waterfall by going down in = frequency, but=20 8.97khz has become a de facto
water hole of VLF .

The result = was=20 exciting. A clean copy of the signal was received at
about 2 = km.

I=20 would also try to test out some of the VLF mode in multipsk = ,
especially=20 PSK10 and PSKAM10, but I have not find a way to fool the
program to = work on=20 8.97Khz yet.

73 and good dx the VLF Steinar=20 la5vna





=
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