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The original message has been attached to this so you can view it or label similar future email. If you have any questions, see @@CONTACT_ADDRESS@@ for details. Content preview: Stefan es Co In the tube/valve era commercial radio stations used a non resonant antenna followed by a wide band 807 amplifiere/distribution network cathode follower low impedence to each Receiver. This is the same approach as used today but using transistor source followers as you mention in your msg. The Transmitters and associated antennas were remote to the Rx site. eg both Transmitter and Receiver sites used rhombic antennas in the desired direction and both sites were several miles apart it is all old hat, nothing is new it has all been done before and today is just being Re invented [...] 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 [62.24.135.70 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 4e3b1488273adbbe9757d6bdd5adf219 Subject: LF: Re: Can I match 2 frequencies with one loading coil? 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=0.4 required=5.0 tests=MISSING_OUTLOOK_NAME, 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 Stefan es Co In the tube/valve era commercial radio stations used a non resonant antenna followed by a wide band 807 amplifiere/distribution network cathode follower low impedence to each Receiver. This is the same approach as used today but using transistor source followers as you mention in your msg. The Transmitters and associated antennas were remote to the Rx site. eg both Transmitter and Receiver sites used rhombic antennas in the desired direction and both sites were several miles apart it is all old hat, nothing is new it has all been done before and today is just being Re invented G3KEV -----Original Message----- From: DK7FC Sent: Friday, June 29, 2018 5:20 PM To: rsgb_lf_group@blacksheep.org Subject: Re: LF: Re: Can I match 2 frequencies with one loading coil? ...what about a non-resonanted antenna? The active antennas cover LF and MF and even HF. Their output is low-impdeant and one could build e.g. two source followers on the back end. Then you can connect two receivers which don't 'see' each other. If you don't like to build a separate active RX antenna (i would do so!) then you could also use the large TX wire. Then you can even afford a double or triple RC lowpass filter in the front end to attenuate the strong MF broadcast stations (if there are still any). 73, Stefan