[time-nuts] 2.5 Ghz 12 digit counter project
Tom Van Baak
tvb at LeapSecond.com
Thu Dec 27 21:17:08 UTC 2012
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).
----- Original Message -----
From: "Paul Amaranth" <Paul at Auroragrp.Com>
To: <time-nuts at febo.com>
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
> paul at AuroraGrp.Com | Unix & Windows
-------------- next part --------------
A non-text attachment was scrubbed...
Size: 38040 bytes
Desc: not available
More information about the time-nuts