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Thread-Index: AQHOvTqQrSyLhbSHfkiSrvEJJCYVuJndAoQK Date: Sun, 29 Sep 2013 18:18:19 +0000 Message-ID: <7E7DFBB4D102A04DB5ADC88D66628A4A0FC619D2@ICTS-S-MBX1.luna.kuleuven.be> References: <524864BC.60908@iup.uni-heidelberg.de> In-Reply-To: <524864BC.60908@iup.uni-heidelberg.de> Accept-Language: nl-BE, en-GB, en-US Content-Language: nl-BE X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.112.13.12] MIME-Version: 1.0 X-HELO-Warning: Remote host 134.58.240.129 (rhcavuit01.kulnet.kuleuven.be) used invalid HELO/EHLO cavuit01.kulnet.kuleuven.be - verification failed X-Spam-Score: -1.4 (-) 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 Stefan, a HF SWM meter should work on 475 kHz, but most of these use a directional coupler made of one or two pieces of wire parallel to the wire that carries the TX signal.. This make them rather unsensitive at low frequencies. So you will need significant more power to get a decent meter deflection. A better option might be a bruene type or tamdem match coupler. [...] Content analysis details: (-1.4 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [134.58.240.129 listed in list.dnswl.org] -0.7 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain X-Scan-Signature: 4e3b1488273adbbe9757d6bdd5adf219 Subject: LF: RE: HF SWR meters on MF? Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable 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=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 Status: O X-Status: X-Keywords: X-UID: 754 Hi Stefan, a HF SWM meter should work on 475 kHz, but most of these use a directional = coupler made of one or two pieces of wire parallel to the wire that carrie= s the TX signal.. This make them rather unsensitive at low frequencies. So = you will need significant more power to get a decent meter deflection. A better option might be a bruene type or tamdem match coupler. 73, Rik ON7YD ________________________________________ Van: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.org= ] namens Stefan Sch=E4fer [Stefan.Schaefer@iup.uni-heidelberg.de] Verzonden: zondag 29 september 2013 19:34 Aan: rsgb_lf_group@blacksheep.org Onderwerp: LF: HF SWR meters on MF? Hi MF, Did someone try to use a normal HF SWR meter on 630m? They are specificated down to 1800 kHz of course but what about 472 kHz? At least it would be good to get some indication that: -There is some output power (e.g. when using an IC706) -One is coming closer to resonance -Impedance is/comes close to 50 Ohm I'm supporting a new potential MF RX station with limited equipment (no oscilloscope...)... 73, Stefan/DK7FC=