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| To: | [email protected] |
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| Subject: | Re: LF: Re: Re: Re: TX system at DK7FC, schematic |
| From: | Stefan Schäfer <[email protected]> |
| Date: | Tue, 20 Dec 2011 13:24:59 +0100 |
| In-reply-to: | <BD04607BFB844A3F85A112052DEA2EF1@JimPC> |
| References: | <CAA8k23Rn9WpQM3Ukf=cq5-bLmWy+o4SEsH2abf7cAX=BpLWExQ@mail.gmail.com> <op.v6k16ktpyzqh0k@pc-roelof> <033201ccbcab$5c5fe640$1502a8c0@Clemens04> <op.v6mtuugnyzqh0k@pc-roelof> <000901ccbcc4$42768fe0$c763afa0$@com> <[email protected]> <002c01ccbd6f$572761c0$0401a8c0@xphd97xgq27nyf> <39D91133A64A480596FBAA4395D85812@JimPC> <007901ccbd9e$69fe2ed0$0401a8c0@xphd97xgq27nyf> <08C805D2A1C04E64836275C632577CF2@JimPC> <000901ccbe3e$31cd2700$0401a8c0@xphd97xgq27nyf> <BD04607BFB844A3F85A112052DEA2EF1@JimPC> |
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Am 20.12.2011 00:49, schrieb James Moritz: [...]With a high loaded-Q antenna, small changes in reactance result in a large mismatch, and the continuously-variable variometer inductance allows precise adjustment of matching. If you used some arrangement of tapped coils instead, the inevitable slight errors in inductance caused by only being able to adjust in discrete steps would probably result in a greater reduction in antenna current than that caused by variometer losses.[...] Exactly.That's what happend tonite and in the morning. The first time in the season it is snowing here and so my system got strongly out of resonance, reducing the TX power by about 10 dB. So i hardly expect TA reports from this night. A pity, since we are in the best time of this season... I really need the automatic variometer now. The phase meter (M0BMU design) already works very well. Hope to get it ready during this week. A work that makes fun! 73 all, Stefan/DK7FC |
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