At 11/23/2006 18:22, you wrote: > >synchronize the clock to GPS time... but that's a whole new topic! > > >It would be more cost-effective to put an 120 VAC input on the controller > >for the purpose of picking off the 60 Hz reference. Ever wonder why your > >50 year-old AC-powered clock keeps perfect time (between power failures, > >anyway)? > > >Yes but old clocks use gears and are less prone to dirt getting into the >counters and causing jumps.
That's easy to take care of in various ways: BPF the 60 Hz then count, or phase-lock an oscillator to the 60 Hz using a very low loop BW & count the oscillator (basically a fancy version of the BPF method). >BTW Bob, I have not been able to key wr6jpl on 131.8 since before the end of >the last shuttle mission. What is up? Will it be up for the next launch? It's sitting 5 ft. to my right, on the workbench. RFPA power wiring burned up at the main connector (it's a Mastr II mobile). I already fixed that (bypassed the RFPA power pins, using Powerpole connector now) & am just taking care of some other minor problems like the audio squelch pre-gate (for the slow gate in the RLC3). BTW, when it comes back it'll be using 103.5 tone. Bob >td >wb6mie > >_________________________________________________________________ >MSN Shopping has everything on your holiday list. Get expert picks by style, >age, and price. Try it! >http://shopping.msn.com/content/shp/?ctId=8000,ptnrid=176,ptnrdata=200601&tcode=wlmtagline > > > > > > >Yahoo! Groups Links > > >
