IK1ZYW Labs
What goes on at IK1ZYW laboratories, day by day.
25 February 2019
GPS Week Number Roll Over, 2019 edition
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I discovered this detail of GPS raw signal in 2010, when my Garmin Geko 201 showed a wrong date . The guys behind GPS (not Garmin) impleme...
15 February 2019
Weird behavior of ZS-042 RTC modules (DS3231)
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First of all: all these ZS-042 RTC modules were paid about 1 USD each and come from not-certified sources. One night I decided to meas...
02 February 2019
Timebase for homemade clocks, 1 pps
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I am currently into a minimalist approach to building (Nixie) clocks that does not include a user interface. The are several reasons, like ...
19 January 2019
Windows 10 1803 failed update week-long nightmare
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In December 2018 I bought a laptop with Win10 (Asus, for the records, but I think it doesn't matter). It has been little responsive sinc...
05 January 2019
Taking control of HP 9403A
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The HP 9403A odyssey might be close to an end. After tracing most connections on the "DVS Program I/O" connector to corresponding...
02 January 2019
HP 1820-0107 pinout
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I have finally found some documentation about HP 1820-0107 custom IC from 1970's. It is (hidden) in the HP 3720A manua...
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