To: | [email protected] |
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Subject: | LF: 475kHz crystal |
From: | Dimitrios Tsifakis <[email protected]> |
Date: | Mon, 7 Jan 2013 16:24:16 +1100 |
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Reply-to: | [email protected] |
Sender: | [email protected] |
Hello LF/MF group, I though this may be of interest to those what would like to build the simplest transmitter possible for MF. I found these cheap crystals on eBay: http://www.ebay.com.au/itm/2-PCS-15200-KHz-HC-49-U-X-TAL-Bargain-Pack-HC49U-/320828846717?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item4ab2e3b27d They are 15200 kHz which can be conveniently used with a 74HC4060 to make an oscillator, then connect to the divide_by_32 line for a nice, stable 475 kHz signal. You can then drive a class-E FET PA for any kind of power you like. 73, Dimitris VK1SV |
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