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| To: | [email protected] |
|---|---|
| Subject: | Re: LF: Results of optimising an active antenna |
| From: | "Roelof Bakker" <[email protected]> |
| Date: | Wed, 02 Dec 2009 17:53:46 -0000 |
| In-reply-to: | <[email protected]> |
| References: | <38A51B74B884D74083D7950AD0DD85E828AAF4@File-Server-HST.hst.e-technik.tu-darmstadt.de> <[email protected]> |
| Reply-to: | [email protected] |
| Sender: | [email protected] |
| User-agent: | Opera Mail/9.63 (Win32) |
Hello Alberto,I have used a large coffee tin (30 cm high and 27 cm diameter), for a passive electric field probe. The capacitance was way to high for active circuitry. Instead a rf transformer wound on a hefty high mu toroid was used to couple the antenna to the coaxial feedline. It worked, though the bandwidth was restricted to LF and MF. An other example is using a small diecast alluminium box (50 x 50 x 30 mm) with the buffer amplifier mounted inside. 73, Roelof, pa0rdt |
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