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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: >The tank coil reads about 80uH, can I just pad it >down with more "C" to get to 73kHz or would that mess up the >L/C ratio and thus lower the loaded "Q" ? Losses will go up four times due to doubling the current through the coil by circulating currents. So it will be a matter of heat dissipation. I know an OM who chose this quick and dirty method to extend a Drake L4B to 160m. It worked but he had to cool the tank coil by a fan. [...] 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 [212.227.17.22 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (cpaul[at]gmx.net) -0.0 SPF_PASS SPF: sender matches SPF record -0.0 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain X-Scan-Signature: ce0e5a4ae990e5a63db3ab7aea21191b Subject: LF: RE: Decca Experts - Converting Red to Purple ? 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=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 Status: O X-Status: X-Keywords: X-UID: 748 >The tank coil reads about 80uH, can I just pad it=20 >down with more "C" to get to 73kHz or would that mess up the=20 >L/C ratio and thus lower the loaded "Q" ? Losses will go up four times due to doubling the current through the = coil by circulating currents. So it will be a matter of heat dissipation. I know an OM who chose this quick and dirty method to extend a Drake L4B = to 160m. It worked but he had to cool the tank coil by a fan. 73 Clemens DL4RAJ=20 >-----Original Message----- >From: owner-rsgb_lf_group@blacksheep.org=20 >[mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Warren Ziegler >Sent: Sunday, August 04, 2013 2:28 AM >To: rsgb_lf_group >Subject: LF: Decca Experts - Converting Red to Purple ? > >Hello to all of the Decca Navigator experts out there... > > I have an unconverted Decca 5501 transmitter which is=20 >marked "Red" - I believe that is 112kHz - would like to run it=20 >on 73kHz. The tank coil reads about 80uH, can I just pad it=20 >down with more "C" to get to 73kHz or would that mess up the=20 >L/C ratio and thus lower the loaded "Q" ? > > Another question - anyone have a spare "Purple" Decca on=20 >71kHz that they would consider parting with? > > > >--=20 >73 Warren K2ORS > WD2XGJ=20 > WD2XSH/23 > WE2XEB/2 > WE2XGR/1 > WG2XRS/1 > > > =20 >E-Mail ist virenfrei. >Von AVG =FCberpr=FCft - www.avg.de >Version: 2013.0.3392 / Virendatenbank: 3209/6548 -=20 >Ausgabedatum: 03.08.2013=20 > >