[time-nuts] HP 1820-0313 4.2V Logic (Flip-flop)

I would look at using a 74HC series flip flop. Runs down to 2V. Or perhaps the ECG or NTE 9093D (an ECG-9093D is $1.25 on Ebay). It's a dual flip flop. You would need to check if the J and K inputs are usable in the 5065A. I think it only has one pin per J/K and the 931G has two AND'd

Re: [time-nuts] HP 1820-0313 4.2V Logic (Flip-flop)

In message <1580810140.741428.1494966823...@mail.yahoo.com>, Ulf Kylenfall via time-nut s writes: >That the 1820-0313 is unobtanium I can understand.Has anyone created >an equvalent based on discretesor is there a suitable SMD "single" >flip-flop like single gatesthat could be suitable?

Re: [time-nuts] GPS seconds conversion on an Arduino

On Sat, May 13, 2017 at 9:58 PM, Mark Sims wrote: > Converting GPS seconds to Gregorian date/time on the Arduino will be an > arduous task. You take GPS seconds and add it to the GPS starring epoch to > get a Julian date. Then add in the number of leap seconds as a

Re: [time-nuts] GPS seconds conversion on an Arduino

Since future leap seconds aren't known very far in advance, how wise is it to even claim to handle any possible leap second or time scale conversion, in a firmware-controlled device that cannot download future leap second information from the Internet? The GPS itself presumably knows how to

[time-nuts] M12+t breakout board, ITU G.8271

Hello, I know that breakout boards for Motorola M12 have been done to death But…. I am doing a one that fits my needs. Primary to add a 1PPS + TOD as defined by ITU G.8271 Since most of the equipment I am working with has this as a standard interface. My plan is to have a AVR to do the

Re: [time-nuts] GPS seconds conversion on an Arduino

The GPS-UTC delta is part of the set of data GPS sends down from the satellites. My GPS clocks will show the time two seconds fast for some amount of time ranging from 0 to 12 minutes after first-fix because the periodicity of that particular message is 12 minutes. My guess is that 2 seconds

Re: [time-nuts] HP 1820-0313 4.2V Logic (Flip-flop)

Hi If you approach this as “restoring a classic car”, then you repair the beast. From a practical standpoint, looking at the schematic and what’s in the divider setup ….. it looks like a < $2 PIC or ($3 STM32 board ) would replace almost everything there. That’s not quite accurate, but it’s

[time-nuts] HP 1820-0313 4.2V Logic (Flip-flop)

Starting to trouble-shoot some of the 5065A circuitryI saw that the (mechanical) clock drive flipflop IC1of the digital divider ass:y A16 is behaving very strange. All of the voltage regulator circuitry in this ass:y is working,providing 4.2V and so on, but IC1 and the two transistorsQ11 and

[time-nuts] Fw: HP 1820-0313 4.2V Logic (Flip-flop)

Dave M wrote: Poul-Henning Kamp wrote: In message <1580810140.741428.1494966823...@mail.yahoo.com>, Ulf Kylenfall via time-nut s writes: That the 1820-0313 is unobtanium I can understand.Has anyone created an equvalent based on discretesor is there a suitable SMD "single" flip-flop

Re: [time-nuts] HP 1820-0313 4.2V Logic (Flip-flop)

Poul-Henning Kamp wrote: In message <1580810140.741428.1494966823...@mail.yahoo.com>, Ulf Kylenfall via time-nut s writes: That the 1820-0313 is unobtanium I can understand.Has anyone created an equvalent based on discretesor is there a suitable SMD "single" flip-flop like single

[time-nuts] HP5061B Modulation Adjustment

https://www.febo.com/pipermail/time-nuts/2017-May/105298.html We recently got our second HP5061B to lock after changing the beam tube. We did no alignment with the exception of changing the gain on Beam current. Ion current dropped from 14 to 1 with only a few hours of operation of the