Hi Paul, Thanks for bringing this to our attention. The block diagram of the counter is at http://siliconchip.com.au/ (also see attached).
It looks like a standard 1970's gated/reciprocal frequency counter design; using 4 digits of high frequency prescaler before it goes into the 8 digit PIC. So the "12 digit" refers to the number of LED's on the front panel. Not to be confused with the "12 digits per second" spec of a modern interpolator-based frequency counter. I.e., it's high range, not high resolution. I see it accepts external 1 Hz gate times from a GPS receiver; further suggesting the resolution is 7- or 8-digits/sec. Still, a nicely designed PIC-based casual bench frequency counter. If eventually the full article is available online let us know. It would be an interesting read. Does anyone know Jim Rowe (Australia)? A related project of his was the UHF Prescaler For Frequency Counters (http://archive.siliconchip.com.au/cms/A_107676/article.html). /tvb ----- Original Message ----- From: "Paul Amaranth" <[email protected]> To: <[email protected]> Sent: Thursday, December 27, 2012 11:12 AM Subject: [time-nuts] 2.5 Ghz 12 digit counter project > Did anyone see the article in the December Silicon Chips magazine about > building a 12 digit 2.5 GHz counter? It has an option for a GPS 1pps > input so you could have some expectation that the last couple of > digits mean something. The website only has the article cover page > in pretty much unreadable type. > > -- > Paul Amaranth, GCIH | Rochester MI, USA > Aurora Group, Inc. | Security, Systems & Software > [email protected] | Unix & Windows >
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