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[195.171.43.25]) by mx.google.com with ESMTP id yn1si4346788wjc.33.2014.05.29.15.43.34 for ; Thu, 29 May 2014 15:43:35 -0700 (PDT) Received-SPF: none (google.com: owner-rsgb_lf_group@blacksheep.org does not designate permitted sender hosts) client-ip=195.171.43.25; Authentication-Results: mx.google.com; spf=neutral (google.com: owner-rsgb_lf_group@blacksheep.org does not designate permitted sender hosts) smtp.mail=owner-rsgb_lf_group@blacksheep.org Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Wq8Vi-00025a-0s for rs_out_1@blacksheep.org; Thu, 29 May 2014 23:09:18 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Wq8VB-00025N-UN for rsgb_lf_group@blacksheep.org; Thu, 29 May 2014 23:08:45 +0100 Received: from icp-osb-irony-out6.external.iinet.net.au ([203.59.1.222]) by relay1.thorcom.net with esmtp (Exim 4.82) (envelope-from ) id 1Wq8Us-00024Z-BI for rsgb_lf_group@blacksheep.org; Thu, 29 May 2014 23:08:44 +0100 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AgoCAN+uh1PL1jkr/2dsb2JhbAANTINZqmsBAQEBAQEGlHuDHQGBJYMZAQEBBDgRHhENBAsNBAMBAQEBCRYIBwkDAgECATQJCBMGAgEBiCoDHrFAn3ANhhMXhVWGZ4IdBoQ6BIRfBZMaB4kFhiGJPQ X-IronPort-AV: E=Sophos;i="4.98,936,1392134400"; d="scan'208";a="42609191" Received: from unknown (HELO [192.168.0.2]) ([203.214.57.43]) by icp-osb-irony-out6.iinet.net.au with ESMTP; 30 May 2014 06:08:20 +0800 Message-ID: <5387AFD3.8010307@netspace.net.au> Date: Fri, 30 May 2014 08:08:19 +1000 From: Richard Rogers User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.5.0 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <3aus82kygodvhbmtvch78dsa.1401357615521@email.android.com> <53871547.5080506@gmail.com> <7E7DFBB4D102A04DB5ADC88D66628A4A0FD448AE@ICTS-S-MBX1.luna.kuleuven.be> <20140529163311.Horde.aqm_07ojKQMxc3Mk7qk64Q2@posti.anvianet.fi> <2505DC2C0A5C4C38AE8614D4C943DAE7@Clemens0811> In-Reply-To: <2505DC2C0A5C4C38AE8614D4C943DAE7@Clemens0811> X-Spam-Score: 0.0 (/) 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: G'day, A2A might mean that now, but marine transmitters certainly keyed the carrier as well as the modulation. I have just been looking at the circuit for an AWA 300W "Pacific" transmitter circa 1950. The only difference between CW and MCW is that the final HT is switched from after the filter to before the filter. They used a 500Hz alternator for the HT supply, so the modulation would have been a rough sounding 1000Hz. [...] 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 [203.59.1.222 listed in list.dnswl.org] X-Scan-Signature: d5ac66e7920295f519efeb68ecc59e6f Subject: Re: LF: 472 tonight Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=none 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 G'day, A2A might mean that now, but marine transmitters certainly keyed the carrier as well as the modulation. I have just been looking at the circuit for an AWA 300W "Pacific" transmitter circa 1950. The only difference between CW and MCW is that the final HT is switched from after the filter to before the filter. They used a 500Hz alternator for the HT supply, so the modulation would have been a rough sounding 1000Hz. Interestingly, an MF receiver of similar date contained an emergency crystal receiver. On 30-May-14 3:46 AM, Clemens Paul wrote: > >Isn't the mode most NDB's use called A3A (tone modulation with >> continuous carrier). > No. :-) > >> A2A indicates that the carrier is keyed together with the tone >> modulation so there is no continuous carrier for easy >> direction finding. > No. :-) > > See > http://en.wikipedia.org/wiki/Types_of_radio_emissions#Type_of_modulation > > for further detailed information. > > 73 > Clemens > DL4RAJ > > > >> -----Original Message----- >> From: owner-rsgb_lf_group@blacksheep.org >> [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of phl@netikka.fi >> Sent: Thursday, May 29, 2014 6:33 PM >> To: rsgb_lf_group@blacksheep.org >> Subject: Re: LF: 472 tonight >> >> Hi! >> >> Isn't the mode most NDB's use called A3A (tone modulation with >> continuous carrier). >> >> A3J again is "voice AM", continuous carrier modulated by speech or >> similar non-digital information such as music. >> >> A2A indicates that the carrier is keyed together with the tone >> modulation so there is no continuous carrier for easy >> direction finding. >> >> >> >> Correct me if I'm wrong, I'm curious since have tried to figure out >> how the mode designations really work. >> >> >> >> BR >> >> Paul-Henrik, OH1LSQ >> >> >> Quoting Clemens Paul : >> >>>> A2A (or tone modulated AM) >>> Just what most NDBs are using. >>> >>> 73 >>> Clemens >>> DL4RAJ >>> >>>> -----Original Message----- >>>> From: owner-rsgb_lf_group@blacksheep.org >>>> [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Rik Strobbe >>>> Sent: Thursday, May 29, 2014 3:18 PM >>>> To: rsgb_lf_group@blacksheep.org >>>> Subject: RE: LF: 472 tonight >>>> >>>> Hi Stefan, >>>> >>>> A2A (or tone modulated AM). >>>> >>>> 73, Rik ON7YD - OR7T >>>> >>>> ________________________________________ >>>> Van: owner-rsgb_lf_group@blacksheep.org >>>> [owner-rsgb_lf_group@blacksheep.org] namens DK7FC >>>> [73dk7fc@googlemail.com] >>>> Verzonden: donderdag 29 mei 2014 13:08 >>>> Aan: rsgb_lf_group@blacksheep.org >>>> Onderwerp: Re: LF: 472 tonight >>>> >>>> MCW ??? >>>> What is that? >>>> 73 >>>> >>>> Am 29.05.2014 12:07, schrieb John Rabson: >>>>> If you are going in for nostalgia, should you perhaps using >>>> MCW in that band? >>>>> 73 >>>>> John F5VLF >>>>> >>>>> On 29 May 2014, at 12:00, C. Groeger wrote: >>>>> >>>>> >>>>>> Hi Pete, >>>>>> Thanks for fine report! >>>>>> Here H bridge directly on mains and lw Ant 300 m long. >>>>>> >>>>>> Have some big GU81 tubes here and maybe you will hear them >>>> soon on MF :-) >>>>>> QRS is no problem, can use straight key if you want to join, Pete! >>>>>> >>>>>> 73, df5qg >>>>>> >>>>>> Christian Groeger >>>>>> >>>>>> M0FMT schrieb: >>>>>> >>>>>> >>>>>>> Hi Stefan es Christian (DK7FC es DF5QG) >>>>>>> >>>>>>> Thanks for a good evening lighting up 472. You were 599C >>>> Christian 599 at times never lost you once 10:15 to 11:10 PM >>>> UK time. CW too fast for me though not to mention the >> Deutsch... hee. >>>>>>> RX here ts690s new antenna up 14m x 80m long sloper un-tuned. >>>>>>> >>>>>>> Interesting signal from you. What was the sender? >>>>>>> >>>>>>> 73 es GL Pete M0FMT >>>>>>> >>>>>>> >>>>>>> >>>>> >> >> > > > > ----- > No virus found in this message. > Checked by AVG - www.avg.com > Version: 2014.0.4592 / Virus Database: 3955/7583 - Release Date: 05/29/14 > -- 73, Ric VK7RO