[Heath] SB-634 clock calibration with WWV?
G3OOU at aol.com
G3OOU at aol.com
Sun Oct 5 11:50:55 EDT 2014
The reference frequency for the clock chip IC201 is provided by your mains
supply so there is no way to adjust that. Over long periods, say 24 hours,
the mains supply is supposed to be very accurate and you can probably find
the spec for the US mains on the Internet. Over short periods of time the
mains frequency moves around a bit.
If you find that the time is changing randomly faster than expected then
it may be noise or pulse interference on the mains causing false triggering
but there is a simple RC filter inside the SB634 to remove any pulses. Check
that the filter capacitor C202 (0.02uF) is still good.
I have a collection of service bulletins for the SB634 if you need them.
Bob F Burns G3OOU
C Eng, FIET, MSE
Crystal Palace Radio & Electronics Club: www.g3oou.co.uk
Technical web site: _www.qsl.net/g3oou_ (http://www.qsl.net/g3oou)
@BobFBurns on Twitter: http://twitter.com/BobFBurns
In a message dated 05/10/2014 14:23:11 GMT Standard Time, ac1wye at gmail.com
Hi, folks. Now that I have my timer display problem figured out, I'm
trying to see how the clocks compare to WWV. In the Manual, there's no mention
of adjusting the clocks slower or faster. Anyone know if there's a way to
73, Sandy AC1Y
Alexander N. Gerli, Sr.
548 Allred Mill Road
Mount Airy, NC 27030-2202
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