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Extremely simple frequency counter project from the RSGB magazine, complete with GPL-licensed firmware. (Although it's for a PIC, you can do basically the same thing with an AVR.)
to counter electronics frequency pic radio ... on 22 September 2009
Various stuff, including some very simple frequency counters (see Hans Summers' site for more), and a Radio-4-locked frequency reference.
to counter electronics frequency ham oscillator qrp radio receiver ... on 22 September 2009
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| - counter | |
| 2 | counter |
| 2 | electronics |
| 2 | frequency |
| 1 | ham |
| 1 | oscillator |
| 1 | pic |
| 1 | qrp |
| 2 | radio |
| 1 | receiver |
tasty by Adam Sampson.