There is a typo in my first post.
TP13 as well as one pulse every 2 second output are negative logic. Manual
does not mention polarity of 2sPP.
On this page: Nortel GPSTM - i3Detroit if I'm reading the circuit diagram
correctly (really a construction diagram), he seems to be inverting it once,
then feeding it to parallel of another inverters. If I do this, I get negative
1pps. I cannot make heads or tails out of scope screen shot as I have no idea
(I can only guess) which trace represents what output. But green line is
showing negative logic.
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Nortel GPSTM - i3Detroit
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---------------------------------------
(Mr.) Taka Kamiya
I'm stuck in a wormhole.... Hello, worms!
On Friday, April 12, 2019, 11:01:02 PM EDT, Taka Kamiya via time-nuts
<[email protected]> wrote:
I was fortunate enough to buy Nortel GPSTM at very good prices. This is a
distant cousin of Thunderbird as far as I know. However, it being CDMA clock
source, it's second pulse output is actually once every 2 seconds. According
to various Internet sources, TP13 on board is 1 PPS.
I measured TP13 and it actually IS 1 PPS. However, this test point is giving
negative logic. Normally +5V and it goes to 0V every 2 seconds.
Manual does not say anything about this being PP2S (with a bar on top).
Has anyone noticed this or am I doing something wrong????
I cascaded two inverters (74AC04) and have used two gates to provide boost to
obtain normally 0V and goes to 5V every 1 second. It works but I am baffled.
Can anyone tell me what I am seeing is actually the way it is?
---------------------------------------
(Mr.) Taka Kamiya
I'm stuck in a wormhole.... Hello, worms!
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