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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: 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. [...] 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 [213.250.81.203 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record X-Scan-Signature: b1e5ebccbad86c8ca1fd46d24f0285de Subject: Re: LF: MF CW now! Content-Type: text/plain; charset=UTF-8; format=flowed; DelSp=Yes X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.3 required=5.0 tests=NO_REAL_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 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 >> >> >>