John Ackermann N8UR
2017-12-23 21:00:51 UTC
I've developed a little board called the PulsePuppy that supports
surplus OCXOs in the common "Eurocase" form factor to provide outputs at
10 MHz, or at 1 PPS/10 PPS/100PPS using an on-board 12F675 PIC with one
of TVB's picDIV firmware images.
The attached pictures show one prototype unit in closeup, and a panel of
three that are used for TICC counter production testing (providing one
10 MHz and two independent PPS outputs). Also attached is an ADEV plot
of the inexpensive Isotemp OCXO131-100 oscillator I'm using to give an
idea of the performance you can expect from these small oscillators
(they and others like them are available from several eBay sources for
<$30).
The PulsePuppy is available from TAPR as a semi-kit and can be ordered
at http://tapr.org/kits_pp.html for $69. We expect to ship the kits in
mid-February (delivery of the boards from our contract manufacturer is
the gating factor).
The assembly manual with schematics can be downloaded at
http://www.tapr.org/~n8ur/PulsePuppy_Manual.pdfm but here are the specs
in brief:
* Footprint for either Eurocase OCXO or Crystek CXOH20-BP-10.000
TCXO (TAPR has a bunch of these TCXOs remaining from another project
and, while they last, is offering them bundled with the PulsePuppy
for an attractive price).
* PPS divider uses TVB PD-13 firmware that includes capability to
synchronize to an external clock.
* TTL-level output at jumper-selectable 10 MHz, 100 PPS, 10 PPS,
or 1 PPS rates.
* A BNC output connector is included, but the board contains a footprint
to install a user-provided SMA.
* 25-turn EFC trimmer with 0-5V range.
* Option to support sine-wave as well as square wave oscillators.
* Board dimensions are 1.5 x 3.5 inches.
TAPR is offering the PulsePuppy as a "semi-kit" that includes the
printed circuit board with all surface-mount components installed, and a
handful of through-hole parts (like voltage regulators, jumpers, and
connectors) for the user to install. By leaving these parts for the
user, the board can be customized -- for example to use different
voltages or to support a sine-wave oscillator.
Note that the kit DOES NOT include the oscillator, unless you buy the
Crystek TCXO bundle.
Happy Holidays to all!
John
surplus OCXOs in the common "Eurocase" form factor to provide outputs at
10 MHz, or at 1 PPS/10 PPS/100PPS using an on-board 12F675 PIC with one
of TVB's picDIV firmware images.
The attached pictures show one prototype unit in closeup, and a panel of
three that are used for TICC counter production testing (providing one
10 MHz and two independent PPS outputs). Also attached is an ADEV plot
of the inexpensive Isotemp OCXO131-100 oscillator I'm using to give an
idea of the performance you can expect from these small oscillators
(they and others like them are available from several eBay sources for
<$30).
The PulsePuppy is available from TAPR as a semi-kit and can be ordered
at http://tapr.org/kits_pp.html for $69. We expect to ship the kits in
mid-February (delivery of the boards from our contract manufacturer is
the gating factor).
The assembly manual with schematics can be downloaded at
http://www.tapr.org/~n8ur/PulsePuppy_Manual.pdfm but here are the specs
in brief:
* Footprint for either Eurocase OCXO or Crystek CXOH20-BP-10.000
TCXO (TAPR has a bunch of these TCXOs remaining from another project
and, while they last, is offering them bundled with the PulsePuppy
for an attractive price).
* PPS divider uses TVB PD-13 firmware that includes capability to
synchronize to an external clock.
* TTL-level output at jumper-selectable 10 MHz, 100 PPS, 10 PPS,
or 1 PPS rates.
* A BNC output connector is included, but the board contains a footprint
to install a user-provided SMA.
* 25-turn EFC trimmer with 0-5V range.
* Option to support sine-wave as well as square wave oscillators.
* Board dimensions are 1.5 x 3.5 inches.
TAPR is offering the PulsePuppy as a "semi-kit" that includes the
printed circuit board with all surface-mount components installed, and a
handful of through-hole parts (like voltage regulators, jumpers, and
connectors) for the user to install. By leaving these parts for the
user, the board can be customized -- for example to use different
voltages or to support a sine-wave oscillator.
Note that the kit DOES NOT include the oscillator, unless you buy the
Crystek TCXO bundle.
Happy Holidays to all!
John