FS: Datum Efratom LPRO 101 Rubidium Frequency Standard, calibrated, with PCB kit

[syau]

I also use a SRS PRS10 (used) with GPS 1pps in (GPS is Ublox M8T) to verify my reference, no problem. next I will seek a Cesium clock.

The frequency is very accurate 

Note: 53310A clock by a GPSDO

[testpoint1]

I also use a SRS PRS10 (used) with GPS 1pps in (GPS is Ublox M8T) to verify my reference, no problem. next I will seek a Cesium clock.

The frequency is very accurate 

Note: 53310A clock by a GPSDO

your GPSDO may exists more tolerance than the LPRO, hehe, check it.

[testpoint1]

I will release a smallest GPSDO soon, only 89 USD.

[testpoint1]

if the country in the attached list, will use e-EMS ship it, the shipping price maybe add some.

[testpoint1]

updated 1/June/2019:
we designed a dedicated PCB board, install of previous board, now no need do any soldering, already installed all components, the new purchasing will use the board.
add a fuse for the power supply, since there is no short circuit protection of LPRO 101, the factory think it is a part, you can install the protection circuit.

[Mechatrommer]

currently testing my Advantest R3465 SA with LPRO101 signal. the LPRO101 cannot lock after long time. usually it will lock in about 15 minutes, it did lock for a moment and then not locked anymore (LED always ON), it still got hot on top, the bottom part (with light green paint) is on big heatsink. what should i do?

[Towger]

AFAIK, you cannot drive a lock LED directly off the (BITE) output.  As per the above boards.  The manual says that requires a high impedance load.
I believe these is a write-up on the model were the author says a low impedance stops it locking.

[testpoint1]

currently testing my Advantest R3465 SA with LPRO101 signal. the LPRO101 cannot lock after long time. usually it will lock in about 15 minutes, it did lock for a moment and then not locked anymore (LED always ON), it still got hot on top, the bottom part (with light green paint) is on big heatsink. what should i do?

if can not lock always, that means the clock is in malfunction, you may try to fix it.

[testpoint1]

AFAIK, you cannot drive a lock LED directly off the (BITE) output.  As per the above boards.  The manual says that requires a high impedance load.
I believe these is a write-up on the model were the author says a low impedance stops it locking.

the OP circuit can drive 5mA.

[Mechatrommer]

the LPRO101 cannot lock. what should i do?

if can not lock always, that means the clock is in malfunction, you may try to fix it.

how to open? no screw here (already opened, picture later). i dont want to change calibration, please advice which one not to touch.

[Mechatrommer]

ok opened, see attachment. where to start which one is suspect? is rubidium bulb suspect? how to open?

[testpoint1]

ok opened, see attachment. where to start which one is suspect? is rubidium bulb suspect? how to open?

give me your email please, PM me.