[time-nuts] OCXO Support Board

[Gerhard Hoffmann]

I can send you 2 boards of V2 of my OCXO carrier board.
You owe me a beer if we ever should meet in person. :-)

The board supports MV89A, MV318, MTI-260, HP10811A,
cheapish CVHD-950, BF171-IS-S-12.7, ECOC-2522 ( 100 MHz oven, Digikey)
Minimum is the mechanical mounting.

Everything else is optional:
-output amplifier to +18 dBm, can be a frequency doubler,
- two crystal or LC notches to catch sub / harmonics
   (10 MHz MV89 is really 5 MHz, and it shows)
- Squarer for incoming reference frequency and the local osc (Linear 
Tech chip)
- a $2.50 Xilinx Coolrunner II CPLD that can generate a 1PPS from 
anything below 200 MHz
   the Coolrunner is programmable in situ via JTAG. Do great things with 
64 FlipFlops. :-)
- 50 Ohm 1 pps driver
- Also in the CPLD is a Dual-FF phase comparator to compare the oven & 
the the
   incoming reference
-- rest of the PLL to lock the OCXO to the incoming frequency, loop 
sense is strapping option
-- alternative trimmer to set oven frequency
-- locking to incoming 1pps works for some oven types only, still needs 
work.

Ten boards did cost $5 at PCBway, DHL wanted $25 for transport. :-<
I can publish the Altium Designer project or the Gerber files when the 
1st ten are used up
and there has been somewhat more testing. The number of possible 
combinations
is quite large.

Cheers, Gerhard


Am 12.05.20 um 19:52 schrieb Wes:
> Does anyone know of a ready made board that will allow me to mount and 
> at the least, minimally support the operation of an MV89A oscillator. 
> I have one which I've powered up deadbug style and would like to clean 
> up the mess a little.
>
> Thanks
>
> Wes N7WS
>
>
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