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[195.171.43.25]) by mx.google.com with ESMTP id p10si13658698wic.44.2014.06.18.08.03.50 for ; Wed, 18 Jun 2014 08:03:51 -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 1WxGhA-0002Mb-8Z for rs_out_1@blacksheep.org; Wed, 18 Jun 2014 15:18:36 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1WxGh9-0002MS-Vt for rsgb_lf_group@blacksheep.org; Wed, 18 Jun 2014 15:18:35 +0100 Received: from smtpout5.wanadoo.co.uk ([80.12.242.80] helo=smtpout.wanadoo.co.uk) by relay1.thorcom.net with esmtp (Exim 4.82) (envelope-from ) id 1WxGh7-0008VI-QT for rsgb_lf_group@blacksheep.org; Wed, 18 Jun 2014 15:18:34 +0100 Received: from AGB ([95.145.231.170]) by mwinf5d67 with ME id FqJX1o0043hEYzB03qJXQY; Wed, 18 Jun 2014 16:18:32 +0200 X-ME-Helo: AGB X-ME-Date: Wed, 18 Jun 2014 16:18:32 +0200 X-ME-IP: 95.145.231.170 Message-ID: From: "Graham" To: References: <890FEB25EF8D41A2A9843DC7D7972D3F@PCFIXE> <8D1588BE7B132A5-2024-D718@webmail-m237.sysops.aol.com> <0D65E2D5B33E454CBBBA70E173A51425@AGB> <53A0BBAC.9030803@gmail.com> <20140617223859.Horde.suUdzUDUx2ua3dsFDcvN8g1@posti.anvianet.fi> <20140618112356.Horde.w3hY7UPcNXQNRpET7dQ4tQ8@posti.anvianet.fi> In-Reply-To: <20140618112356.Horde.w3hY7UPcNXQNRpET7dQ4tQ8@posti.anvianet.fi> Date: Wed, 18 Jun 2014 15:18:31 +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-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: Ok Paul, Its round the Q and Q + not Q , configuration , the latest drivers allow that to be selected , the single feed seems to work fine , but still needs some filtering to prevent images .. I think, possibly a pass band limited pre-amp would help for MF/LF , the gain drop's past a couple of MHz and the 200 ohms z needs some matching , may be the mini-whip is providing this aspect ? [...] 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] X-Scan-Signature: f64a6c8ea7591cecbecc6db95ffdd328 Subject: Re: LF: MF CW now! Content-Type: text/plain; format=flowed; charset="UTF-8"; reply-type=response 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=0.1 required=5.0 tests=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 Ok Paul, Its round the Q and Q + not Q , configuration , the latest drivers allow that to be selected , the single feed seems to work fine , but still needs some filtering to prevent images .. I think, possibly a pass band limited pre-amp would help for MF/LF , the gain drop's past a couple of MHz and the 200 ohms z needs some matching , may be the mini-whip is providing this aspect ? There are image responses linked to the sample rate , a pre-selector as opposed to a 'tuner' would be 'ok' for HF , I think . I have another 'now' low band dongle . used to be high band , but after a 7 MHz session , with it connected to a 10 mtr Ae , the vhf front failed .. so that's a candidate for mf/lf conversion , these have two life's ! One of Jim's two active device band limited pre-amps , with 200 ohms o/p z would be ideal , or use the toroid as the o/p coupling device ? that may be the most elegant configuration ? 73-G, -------------------------------------------------- From: Sent: Wednesday, June 18, 2014 12:23 PM To: Subject: Re: LF: MF CW now! > Hello Graham, LF > > To be honest I have not tried other feeding methods for the AD than a > trifilar 1:4 transformer. I used a beefier toroid (FT50-43) and more > turns to get a XL of 200 ohms at 400 kHz for the 50 ohm winding. The > concept of having the AD and antenna line galvanically separated and the > antenna input DC-shorted appealed to me since there is no other > protection against static. > > > I will give capacitor-coupling a try at some point. > > > A simple LPF is mandatory at least if one plans to use wire antennas, > otherwise there is a large risk of interference from VHF FM broadcasting. > > > BR > > Paul-Henrik, OH1LSQ > > > Quoting Graham : > >> Paul, >> >> Q , do you find the transformer feed better than , simply >> connecting via a capacitor to the AD ? >> >> 73-G, >> >> -------------------------------------------------- >> From: >> Sent: Tuesday, June 17, 2014 11:38 PM >> To: >> Subject: Re: LF: MF CW now! >> >>> Hello Stefan, LF >>> >>> Your CQ's are 539 here on a Mini-Whip directly into the >>> demodulator" -chip on a slightly hardware-hacked RTL-SDR TV USB-dongle >>> :-). >>> >>> The "hack" is just bypassing the VHF/UHF tuner-chip and running >>> straight into the +I and -I inputs of the RTL2832U via a 1:4 XFRMR. >>> >>> >>> >>> No TX here at the moment but receiving you so well on a hacked 10 euro >>> USB-dongle and the old MiniWhip is just a tad more than I expected... >>> >>> >>> BR >>> >>> Paul-Henrik, OH1LSQ >>> Vaasa, KP03SD >>> >>> >>> >>> Quoting DK7FC <73dk7fc@googlemail.com>: >>> >>>> 472.2 kHz... >>>> >>>> Anyone for a QSO? >>>> >>>> 73, Stefan >>> >>> >>> > > >