Comments (9)
UzixLS
commented on May 24, 2024
Hello
I've never dealt with GBS. I suppose there is some incompatibility with Pentagon video signal timings, which is going beyond PAL specifications. Can you check in 48K and 128K modes?
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terenceang
commented on May 24, 2024
Actually, The Pentagon timing is the only 1 that works, the others won't even lock.
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UzixLS
commented on May 24, 2024
Ouch, that's unexpected. 48K timings are best in terms of compatibility with TVs.
Are you using latest firmware? How GBS is connected to Sizif? Is your TV/Monitor supports 50Hz? Can you check frequency on 74HCU clock output? There is should be 28 MHz exactly.
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terenceang
commented on May 24, 2024
sadly, the clock is not 28Mhz exactly. it jitters at 27.78, 28.04, 28.09.
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terenceang
commented on May 24, 2024
It think I my 74HCU04 might be the problem, the China seller might have give me 74HC04. Let me double check. Thanks.
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terenceang
commented on May 24, 2024
is the clock out from 74HCU04N supposed to be a Square wave? mine is a sine wave. Ordering some 74HCU04 to try.
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UzixLS
commented on May 24, 2024
This may be caused by oscilloscope bandwidth limitation.
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terenceang
commented on May 24, 2024
I have a RIGOL DS1052E. will it measure 28Mhz properly?
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UzixLS
commented on May 24, 2024
No. It's have 50MHz bandwidth. To get accurate square waveform at least 10x (280MHz) bandwidth required.
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Related Issues (13)
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