Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=5.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, HTML_MESSAGE,RCVD_IN_DNSWL_MED,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 X-Spam-DCC: : mailn 1480; Body=2 Fuz1=2 Fuz2=2 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by lipkowski.org (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id v65BsOoL009473 for ; Wed, 5 Jul 2017 13:54:25 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1dSioc-0006vL-IZ for rs_out_1@blacksheep.org; Wed, 05 Jul 2017 12:49:54 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1dSiob-0006vC-Uz for rsgb_lf_group@blacksheep.org; Wed, 05 Jul 2017 12:49:53 +0100 Received: from mout02.posteo.de ([185.67.36.66]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1dSioZ-0001D9-4i for rsgb_lf_group@blacksheep.org; Wed, 05 Jul 2017 12:49:52 +0100 Received: from submission (posteo.de [89.146.220.130]) by mout02.posteo.de (Postfix) with ESMTPS id AC6AE20E3C for ; Wed, 5 Jul 2017 13:49:47 +0200 (CEST) Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 3x2fLL6g0Fz10HX for ; Wed, 5 Jul 2017 13:49:46 +0200 (CEST) Message-ID: <595CD25A.8050009@posteo.de> Date: Wed, 05 Jul 2017 13:49:46 +0200 From: DK7FC User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <595CB879.6040207@posteo.de> <595CC4B1.8030902@posteo.de> In-Reply-To: <595CC4B1.8030902@posteo.de> X-Scan-Signature: 17343f7e400f1005b5081acbd4115359 Subject: Re: LF: Auto-EbNaut reception on LF in JN80 Content-Type: multipart/alternative; boundary="------------040207040803050807030000" 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-Scanned-By: MIMEDefang 2.75 Status: O X-Status: X-Keywords: X-UID: 12179 This is a multi-part message in MIME format. --------------040207040803050807030000 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Hi all, I'm sorry for the many emails today. But i have another idea for Domenico: You could run a 3rd 'channel', e.g. 137.485 kHz (still oriented on the current frequency section) and indicate/define this channel (3) as a 'local' channel, whereas the other channels are indicated as 'medium' (2) and 'DX' (1). The difference in the settings in these channels (apart from the frequency of course) is the list size! Local stations or strong stations like me will decode almost every time at rank 0, so you can use a very small list length for that channel, e.g. 50. A weak/distant station or in times of high QRN one (e.g. VO1NA) would prefer to use one of the other channels, just in case that the rank will be much worse. You can see that most of the 'false' decodes happen at list lengths of > 5000. So with the use of different list lengths you can avoid several false decodes, CPU usage and false entries in the log file. For the 'medium' channel you could use a list length of 1000 and for DX maybe 20000. Just an idea :-) Using two frequencies has already improved the situation: ----------------------------------------- 2017-07-05_09:59:30 start time + 30 s on 137.490 kHz found rank 0 ber 8.0645e-02 Eb/N0 10.6 M -9.849675903e+02 [*GM ALL IW4DXW K*] ps [ 1 180 180 180 180] 2017-07-05_10:59:30 start time + 30 s on 137.495 kHz found rank 0 ber 2.3185e-01 Eb/N0 4.9 M -5.360782471e+02 [*73 FROM DL TO I*] ps [ 0 0 0 0 0] -------------------------------------------------------- In a few minutes i will try to run less antenna current to come closer to the limit :-) Thanks for the great service :-) 73, Stefan --------------040207040803050807030000 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 7bit Hi all,

I'm sorry for the many emails today. But i have another idea for Domenico:

You could run a 3rd 'channel', e.g. 137.485 kHz (still oriented on the current frequency section) and indicate/define this channel (3) as a 'local' channel, whereas the other channels are indicated as 'medium' (2) and 'DX' (1).
The difference in the settings in these channels (apart from the frequency of course) is the list size!
Local stations or strong stations like me will decode almost every time at rank 0, so you can use a very small list length for that channel, e.g. 50.
A weak/distant station or in times of high QRN one (e.g. VO1NA) would prefer to use one of the other channels, just in case that the rank will be much worse.
You can see that most of the 'false' decodes happen at list lengths of > 5000. So with the use of different list lengths you can avoid several false decodes, CPU usage and false entries in the log file.
For the 'medium' channel you could use a list length of 1000 and for DX maybe 20000.

Just an idea :-)

Using two frequencies has already improved the situation: 

-----------------------------------------
2017-07-05_09:59:30   start time + 30 s  on 137.490 kHz 
found rank 0 ber 8.0645e-02 Eb/N0 10.6 M -9.849675903e+02 [GM ALL IW4DXW K] ps [  1  180  180  180  180]
2017-07-05_10:59:30   start time + 30 s  on 137.495 kHz 
found rank 0 ber 2.3185e-01 Eb/N0 4.9 M -5.360782471e+02 [73 FROM DL TO I] ps [  0    0    0    0    0]
--------------------------------------------------------
In a few minutes i will try to run less antenna current to come closer to the limit :-)

Thanks for the great service :-)

73, Stefan
--------------040207040803050807030000--