Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mg03.r1000.mx.aol.com (Internet Inbound) with ESMTP id B6B4E380000AC; Tue, 26 Jun 2012 08:45:20 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1SjV89-0005sJ-51 for rs_out_1@blacksheep.org; Tue, 26 Jun 2012 13:44:29 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1SjV88-0005sA-JE for rsgb_lf_group@blacksheep.org; Tue, 26 Jun 2012 13:44:28 +0100 Received: from nm4.bullet.mail.ird.yahoo.com ([77.238.189.61]) by relay1.thorcom.net with smtp (Exim 4.77) (envelope-from ) id 1SjV86-0006UT-58 for rsgb_lf_group@blacksheep.org; Tue, 26 Jun 2012 13:44:27 +0100 Received: from [77.238.189.230] by nm4.bullet.mail.ird.yahoo.com with NNFMP; 26 Jun 2012 12:44:25 -0000 Received: from [212.82.108.243] by tm11.bullet.mail.ird.yahoo.com with NNFMP; 26 Jun 2012 12:44:25 -0000 Received: from [127.0.0.1] by omp1008.mail.ird.yahoo.com with NNFMP; 26 Jun 2012 12:44:25 -0000 X-DKIM-Result: Domain=yahoo.co.uk Result=Good and Known Domain X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 73999.10732.bm@omp1008.mail.ird.yahoo.com Received: (qmail 16209 invoked by uid 60001); 26 Jun 2012 12:44:24 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.co.uk; s=s1024; t=1340714664; bh=BeWKfbB5Ps/zCrMsiikTRLMP1tEZURm5MEhgAEjOHzQ=; h=X-YMail-OSG:Received:X-Mailer:References:Message-ID:Date:From:Reply-To:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=eqXrA/ANpOb04g1NHQe2e/6PX/XoNhfOy72i5cFgza5UqI+Hdux4JYf0Jw69l6esvsSPoBpfTZB+z6Y54UVyarFuzF3391ATMqNMRHqVlmgqGDcrD83kWFINj44h0ZdWvvQjK1tTGLEs8jPmDF0e+l0+C5+FqvK/0WHQKyYMisk= DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.co.uk; h=X-YMail-OSG:Received:X-Mailer:References:Message-ID:Date:From:Reply-To:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=KOLwTr7YUvP9FZ/TYLXAL/p54964dP097oa35RBI4n/OYkFaStx6LvEem39QYVmf5ZgyW5wPbfBEtJW0ZKqsKfFSevu9CbJL2rty+Oyv7t6f9i/iAOi31qre5SfwzrguUr0e1+lDHz8uXrnLl3VzDEj9DSlbuzAtbc4D3wCp1xM=; X-YMail-OSG: URe5B4gVM1lw9NEMAFSRWtCLqVTI.1845D37TjdFpGU010c .L1BnyQw8yTfFbm9Xajn7bKeppeRx9rOOzpbQtcqJ57MvBj1q7.nrGlRm4Vw nJu_EO76ON_5.m75xbviZSzbPogF9oOJFQOTi0Sdphioh4rwcKjIXF7uf7SA usdhUZG39qaufrhtHb_eD4dKhFeIgyFqf_1DgkxjqnEhid3mg8lpWK3wPU9Z EFchQG929jyrktx9uPrDNCxyNARMR6s7anBJ731ZJQs9mJhM0rNpqOwQpasj hHVWQLd8sbdRP_9LM9GhgwVHEUjlZk2d4igNFyIa2ubG7WuhRIge7H7LHeUj WWrPQMHTL_d9R5kjvVY4XEdhAnQhzd7DCvK3v5Zcnhy1VTdUgaZqcCQD_oZ7 UVLucvNqOLC9ZuGdm8XryRZUcxCnWa5yVn.RQZ8MSSOEyla3oYRxFxw-- Received: from [86.164.61.75] by web171604.mail.ir2.yahoo.com via HTTP; Tue, 26 Jun 2012 13:44:24 BST X-Mailer: YahooMailWebService/0.8.118.349524 References: <002801cd536e$76b08400$0401a8c0@xphd97xgq27nyf> Message-ID: <1340714664.16060.YahooMailNeo@web171604.mail.ir2.yahoo.com> Date: Tue, 26 Jun 2012 13:44:24 +0100 (BST) From: M0FMT To: "rsgb_lf_group@blacksheep.org" In-Reply-To: <002801cd536e$76b08400$0401a8c0@xphd97xgq27nyf> MIME-Version: 1.0 X-Spam-Score: 1.0 (+) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. 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 Mal Yes and AM has the same sort of transparency to co channel signals as SSB to a degree (same type of mode of course) where as FM captures the channel and cannot be over ridden unless the competing signal is about 3dB stronger. FM also seems to drop off very quickly with range especially if the audio modulation is not set to its optimum i.e with 6dB compresson (Pre emphasis, clipped, De emphasis, filtered). Further more this very narrow band FM IMHO is useless. And it is FM that we can thank for V/UHF channelisation it never used to be like that it was the availability of in the late 60s/70s of cheap Rice Boxes that turned it into an FM channalised wastland. I think AM has a lot going for it and it amazes me that the Marine people opted for FM since they must have had advisers who were familiar with the days 2182. We try to keep AM going on TB and 4m around here but the FM seems to have hijacked 70.26 in the name of the RSGB. 73 es GL Pete M0FMT IO91UX [...] Content analysis details: (1.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [77.238.189.61 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (m0fmt[at]yahoo.co.uk) 0.0 HTML_MESSAGE BODY: HTML included in message 1.0 FSL_FREEMAIL_1 FSL_FREEMAIL_1 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 1e15d6d6179985f133b43d42d658878a Subject: Re: LF: A/G FREQS Content-Type: multipart/alternative; boundary="435439028-1280246733-1340714664=:16060" 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, TO_ADDRESS_EQ_REAL 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: 0:2:444763072:93952408 X-AOL-SCOLL-URL_COUNT: 0 X-AOL-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-m231.1 ; domain : yahoo.co.uk DKIM : fail x-aol-sid: 3039ac1d60cb4fe9aee03b56 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none --435439028-1280246733-1340714664=:16060 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Hi Mal=0A=A0=0AYes and AM has the same sort of transparency to co channel s= ignals as SSB to a degree (same type of mode of course) where as FM capture= s the channel and cannot be over ridden unless the competing signal is abou= t 3dB stronger. FM also seems to drop off very quickly with range especiall= y if the audio modulation is not set to its optimum i.e with 6dB compresson= (Pre emphasis, clipped, De emphasis, filtered). Further more this very nar= row band FM IMHO is useless. And it is FM that we can thank for V/UHF chann= elisation it never used to be like that it was the availability of in the l= ate 60s/70s of cheap Rice Boxes that turned it into an FM channalised wastl= and.=0AI think AM has a lot going for it and it amazes me that the Marine p= eople opted for=A0FM since they must have had advisers who were familiar wi= th the days 2182. We try to keep AM going on TB and 4m around here but the = FM seems to have hijacked 70.26 in the name of the RSGB.=0A=A0=0A73 es GL P= ete M0FMT IO91UX=0A=0A=0A________________________________=0A From: mal hami= lton =0ATo: rsgb =0AS= ent: Tuesday, 26 June 2012, 8:36=0ASubject: LF: A/G FREQS=0A =0A=0A =0AAs= stated Air/Ground vhf/uhf is AM and =0Asimplex=A0working. =A0I have also n= oticed a well modulated AM transmitter =0Ais more potent than a FM transmit= ter when working at max range. On AM the RX =0Abandwidth can be opened up t= o receive several stations simultaneously then =0Aselect the one of interes= t by closing down the selectivity, the same applies on =0ACW. =A0On FM if y= ou tried this the=A0transmission would fall into a black =0Ahole, in other = words the=A0FM rx has to be tailored to the =0Aexact=A0bandwidth of the tra= nsmission (same deviation value) =0Ag3kev --435439028-1280246733-1340714664=:16060 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
Hi Mal
 
Yes and AM has the same sort of transparency to co channel signals= as SSB to a degree (same type of mode of course) where as FM captures the = channel and cannot be over ridden unless the competing signal is about 3dB = stronger. FM also seems to drop off very quickly with range especially if t= he audio modulation is not set to its optimum i.e with 6dB compresson (Pre = emphasis, clipped, De emphasis, filtered). Further more this very narrow ba= nd FM IMHO is useless. And it is FM that we can thank for V/UHF channelisat= ion it never used to be like that it was the availability of in the late 60= s/70s of cheap Rice Boxes that turned it into an FM channalised wastland.
I think AM has a lot going for it and it amazes me that the Marine= people opted for FM since they must have had advisers who were familiar with the days 2182. We try to keep AM going on TB and 4m around h= ere but the FM seems to have hijacked 70.26 in the name of the RSGB.
<= div> 
73 es GL Pete M0FMT IO91UX
From: mal ham= ilton <g3kevmal@talktalk.net>
To: rsgb <rsgb_lf_group@blacksheep.org>
Sent: Tuesday, 26 June 2012, 8:36 Subject: LF: A/G FREQS

=0A=0A =0A =0A=0A=0A
=0A<= div>As stated Air/Ground vhf/uhf is AM and =0Asimplex&= nbsp;working.  I have also noticed a well modulated AM transmitter =0A= is more potent than a FM transmitter when working at max range. On AM the R= X =0Abandwidth can be opened up to receive several stations simultaneously = then =0Aselect the one of interest by closing down the selectivity, the sam= e applies on =0ACW.  On FM if you tried this the transmission wou= ld fall into a black =0Ahole, in other words the FM rx has to be tailo= red to the =0Aexact bandwidth of the transmission (same deviation valu= e)
=0A
g3kev
=0A
 = ;
=0A


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