Note: If you need full CTCSS functionality the www.piexx.com FTS7-apx is probably the way to go. This page is about encoders only.
The simplest solution is analogue -- use an NE567 to generate the required frequency. Pro: cheap. Con: frequency drift, single frequency. Here's VK2KUR's version via VK2BV, or look at N1HFX's version which uses an active filter.
Same schematic as ZS1AYJ.
hits since 2015-07-10.
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