Products > Test Equipment
HP5385A OCXO Timebase
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Miti:
Being obsessed with the stability of the time base in my instruments (does it sound familiar?) I decided to make an OCXO oscillator for my HP5385 frequency counter (the TCXO oscillator that was installed is ridiculous) until I find the time to put together a GPSDO. It is nothing too crazy, a used OSC5A2B02 OCXO from Ebay, a MAX6126AASA21 and a potentiometer. So I made a board, got it done in China by PCBWay and installed it today. All I can say is that the difference is huge. I calibrated it using another 10MHz OCXO manually disciplined to a GPS module using my Tek TDS210 scope and a programmable power supply for VFC.
metrologist:
Are you offering these populated minus the clock? Do the pins connect to the counter's board as a drop-in replacement?
Miti:
I'm offering the bare boards only as I don't have the time to populate them and  don't think I'd make any geschaft.
The board is a drop in replacement for option 004, you'll need to do the following beside populating this board:

1. Remove the TCXO.
2. Populate a ferrite bead and a 10 - 100nF capacitor that are left out on the counter board.
3. Move a jumper from one location to another.
4. Solder the new board in the place of OCXO, drop in as I said.
5. Let it run for few hours and then calibrate.

It is a dramatic improvement.
DC1MC:
Hi Miti, do you still have some boards, how much will cost to post one to Germany in a padded envelope ?

 Cheers,
 DC1MC
DC1MC:
The board from Miti arrived nicely and the OCXO as well (I've got tow of each type, they are compatible).

Because of a brain fart  :(, I've posted pictures in this thread:
https://www.eevblog.com/forum/testgear/hp-5385a/

Bit promise that when the board is done, I'll post the final result here  ^-^.

  Cheers,
  DC1MC

Edit: Added a picture to the Miti PCB, OCXO and a DIP16 socket for reference :)

Also a datasheet PDF oft the CTI oscillator.
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