Hi

In this era of $5 for 10 boards from China, a lot of folks have laid out various
boards. They aren’t “ready made” but they get past the dead bug stuff.

Bob

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:

On Dienstag, 12. Mai 2020 20:53:25 CEST Gerhard Hoffmann wrote:

If you publish the Gerber files, People in the US can use OSHPark for having
the boards made, in EU Aisler.net is probably the best option.

BR,
Matthias

I've been trying to find a base PCB design to use too.  In the interim I
bought some boards from Gerry Sweeney that sells them for HP5313x frequency
counter OCXO upgrades and supports different footprints.  Open source
design is even better.  OSHpark is great.  Please post it!

Bill E.

On Tue, May 12, 2020, 11:59 PM Matthias Welwarsky time-nuts@welwarsky.de
wrote:

A year ago I posted the two boards with Gerber File since no one was willing to make and sell. If there is still interest I will post Gerber file again have to look for it
Bert Kehren

In a message dated 5/13/2020 7:40:49 AM Eastern Standard Time, notfaded1@gmail.com writes:

I've been trying to find a base PCB design to use too.  In the interim I
bought some boards from Gerry Sweeney that sells them for HP5313x frequency
counter OCXO upgrades and supports different footprints.  Open source
design is even better.  OSHpark is great.  Please post it!

Bill E.

On Tue, May 12, 2020, 11:59 PM Matthias Welwarsky time-nuts@welwarsky.de
wrote:

time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
and follow the instructions there.

Hi

There are a number of free ( = there is no license fee ) pcb layout programs out there.
One of the many is KiCad. It’s not that hard to use. It is very popular. There are a lot
of YouTube videos and blogs detailing how to do this or that with it. Laying out a board
to mount an OCXO on is a pretty good starter project.

Once you get going, a board is a weekend project. Indeed, a simple board might be an
evening project. There’s not a lot involved.

Once you have your layout, it goes off to any of a number of outfits. Seeed Studio is
one that many people use. WellPCB is another that comes with a lot of recommendations.
As long as you stick with < 100 mm x < 100 mm parts a number of places will sell you
boards for 50 cents each.

Shipping does cost $20 to $30, so doing more than one board at a time is a pretty good
idea. If you are laying out five boards a week, batching them up isn’t the hard part :)

While most don’t seem to use it, many board houses also offer assembly / pick and place
services. On a board that uses simple parts, that might take out the whole assembly
process. No idea (yet) how well that part goes ….

Bob

Bert,

I found them. You posted the Gerber files as file OCXO.pcb-1.zip on
5-Nov-2018 here:

http://lists.febo.com/pipermail/time-nuts_lists.febo.com/2018-November/094597.html

http://lists.febo.com/pipermail/time-nuts_lists.febo.com/2018-November/094598.html

/tvb

On 5/13/2020 5:34 AM, ew via time-nuts wrote:

On 5/13/20 5:56 AM, Bob kb8tq wrote:

I've used several assembly services (in Oregon, as it happens) for small
boards at work (<100mm square, although that's not a requirement for the
service) and had relatively good luck. One of the nice things is that
some services will actually order and kit the parts for you - you send
them a board design, with a parts list from digikey, and a couple weeks
later, you get your boards back.

It's not super cheap, but it sure is convenient.

Hi

Some of the Chinese outfits flip that model around the other way.
You get to use the parts they have in stock. Setup appears to be
dirt cheap, as well as the basic parts costs.

One of many examples:

https://jlcpcb.com https://jlcpcb.com/

I haven’t used them for assembly, but the do make ok boards.

Since the parts range is limited, you will be putting a few things on
yourself. I’d guess that 90% of the parts on a typical board will be
things they can supply. Is there another gotcha? Not at all clear (yet).

The outfit above has two categories of parts (basic and extended). It
appears that when you go into the extended group, there may be some
minimum order gotchas ….

Bob

Am 13.05.20 um 13:35 schrieb Bill Notfaded:

Here it is:

< http://www.hoffmann-hochfrequenz.de/downloads/ocxo_carrierV2_pack.zip    >

These are the Gerber files as used by PCBway to produce my boards.

2 buglets:

• the 2 mounting screws for the 10811 should be slightly bigger.

  Drill as needed

• Unless the oscillator delivers only a small signal, the 2 emitter
  capacitors should

  each get 22 Ohms in series to adjust gain.

This will be addressed in V3. Circuits are included, comments and small
change

requests are welcome, could be done shortly thanks COV19.

cheers, Gerhard

I can remember "wiring" up some X-band test equipment with WR90 waveguide,
flanges and a brazing torch. We "miniaturized" the missile hardware by using 1/4
height W/G. Circa 1966.

Wes

On 5/13/2020 9:12 AM, ew via time-nuts wrote: