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| To: | rsgb_lf_group@blacksheep.org |
|---|---|
| Subject: | LF: Antenna switching 72/136kHz |
| From: | "Rik Strobbe" <rik.strobbe@fys.kuleuven.ac.be> |
| Date: | Wed, 22 Mar 2000 20:00:18 |
| In-reply-to: | <000c01bf7ea4$c69a4ac0$20d725c3@194.95.193.10.fen.baynet.de> |
| Reply-to: | rsgb_lf_group@blacksheep.org |
| Sender: | <majordom@post.thorcom.com> |
In my previous mail I forgot to mention that 'parallel tuning' of the antenna will only work with a high-impedance RX input (FET-preamp). For 50 Ohm input series tuning can be used (an additional series capacitor between RX and loadingcoil). This capacitor can be short-circuited to switch from 136 to 72kHz. A simple low-voltage relais will do. Thanks to Jim (M0BMU) to point this out. 73, Rik ON7YD |
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