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| To: | "[email protected]" <[email protected]> |
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| Subject: | LF: Coupling a LF resonant ferrite rx antenna |
| From: | Daniele Tincani <[email protected]> |
| Date: | Thu, 28 Jun 2012 15:14:33 +0100 (BST) |
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Hello LF, it seems I managed to build a pretty good ferrite coil (abot 80 turns of Litz wire over a bundle of seven 20cmx1cm rods). Nulling and peaking seem acceptable for my purposes. With current var cap, tuning range is about 160-650 kHz and could easily be moved to lower frequencies by adding a parallel fixed capacitor. Until now I have only made some quick tests by inductively coupling the coil with the internal
ferrite of a portable radio. I would like now to make the antenna suitable also for direct connection with a 50 ohm input. What do you suggest: to add for example a transformer or a buffer amplifier (or both :-))? If a transformer is recommended, is it advisable to use the main coil as the primary
winding? 73 Daniele IZ5WWB |
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