I purchased the 4 hour calibrated fully built system. Electronically, it worked perfectly. However the mounting holes on the revision of the board I bought (Rev C?) are too close to components - in one case the machine bolt head inserted into the hole touched a capacitor and in another case, I couldn't get a bolt head with washer inserted in the hole because the trimming pot blocked it.
I communicated this to the supplier and the engineer who responded said this should be easy to fix in the next board revision. The response was timely, professional and the engineer obviously knew what he was talking about. [NB: I rated the product as good, but the rating of the other characteristics is not correct, since on my browser clicking on any star of the 5 generated an "Amazing" 5 star rating. For the record, I would rate shipping as good, documentation as average and communication as good. I tried to leave them unrated, but the evaluation process required that I rate everything.]
Response from IR AnalysIR-Infrared decoder & anlayzer OCXO 10Mhz | Oct. 11, 2016
Thanks for the feedback - much appreciated and as you mentioned we will feed that back into the next rev of the board.
Some additional comments: - Mounts: are fine in the current Rev with the correct size screw head, but we will create more space near the mounts in the next Rev. Of course with Plastic/nylon mounts even larger heads could be used. Snap through plastic mounts are also fine. - Documentation: After follow-up, it seems the information/documentation you needed was already provided on the Main Tindie page for this product. However, in future we will also include the links to the OCXO datasheets in the information pack we email after shipping the product. (The Info pack we issue includes 6 documents - Schematic(s), BoM, Component Placement & Layout, OCXO footprint & dimensions and now a copy of the Links to available datasheets of the OCXOs we provide)
I picked up two of these. One I left as is. The other I have converted to an 80 MHz clock by adding a couple of clock multiplier ICs to the back of the unit. The extra pads on the back are great for this purpose. I will be rebuilding this unit as a 50 MHz clock by taking advantage of the harmonics on the square wave output and applying a bandpass filter at the fifth harmonic.
I checked the 10 MHz output of two units against each other using an oscilloscope. They seem to be within about 1/5 Hz of each other, so I'm quite pleased with the calibration. Frequency stability seems excellent. I had the opportunity to use one of these units outdoors on a cool day, and although it took a little longer to warm up, once the oven came up to temperature the frequency was bang on.
Response from IR AnalysIR-Infrared decoder & anlayzer OCXO 10Mhz | April 11, 2016
Thanks for the update...I am particularly pleased you found a novel use for the extra footprints on the back of the PCB...I had primarily envisaged frequency dividers, so the frequency multiplier application is extra cool!