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| To: | [email protected] |
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| Subject: | VLF: T106-52 cores on VLF |
| From: | DK7FC <[email protected]> |
| Date: | Wed, 27 Apr 2016 20:20:25 +0200 |
| In-reply-to: | <[email protected]> |
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Hi VLF,I've done a quick experiment with the T106-52 cores which could give some more ideas regarding these cores for a compact VLF coil. I wound a coil with 0.5mm enameled cu wire, 85 turns at 33mm diameter. Inside the coil there are 5 of these cores stacked on another. In parallel there is a suitable C of 1 uF. https://dl.dropboxusercontent.com/u/19882028/VLF/20160427_195530.jpgThe resonance was found at 7.49 kHz. The 3 dB bandwidth is (7.64-7.36) kHz = 280 Hz. Q = 27. L = 452 uH. Without the cores inside, the resonance frequency rises to 14.54 kHz and the bandwidth is (15.12-14.07) kHz = 1.05 kHz. Q = 14. L = 120 uH. Hmm, so in this configuration, the effective µr (ur) seems to be just 3.75! :-/ That means i still need half of the number of turns for a single layer VLF transmit coil?!? 73, Stefan |
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