[time-nuts] Questionable question about the Lucent RFTGs
doug at dougronald.com
Fri Dec 5 13:09:00 EST 2014
I didn't think of Selective Availability when I asked the question. Bill Clinton didn't order it turned off until May of 2000, so there is probably active software on the board to emolliate the effects. Also, yes, the 68000 latency most likely required an FPGA's real time capabilities. Thanks everyone for the answers...
From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of Pete Lancashire
Sent: Friday, December 05, 2014 7:29 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Questionable question about the Lucent RFTGs
HPs unit cost for 68000s would have been very, very good. Add up all the instruments and laser printers (I think the controllers where parcs ?), then add the 1000's of man hours of software experience you can imagine why a 68K.
On Thu, Dec 4, 2014 at 12:03 PM, Doug Ronald <doug at dougronald.com> wrote:
> I have sort of a dumb question about the Lucent KS-24361 RFTGs. Why do you suppose there is so much compute power in these units? They have the Xilinx FPGA, and the 68000 CPU just to discipline a 5 MHz oscillator? There must be more going on with these devices than meets my eyes.
> Thanks anyone,
> -Doug W6DSR
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