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| 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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