[time-nuts] New product: the TAPR "PulsePuppy"

[Mark Sims]

That's what I thought,  but in a real world application I got better results 
with the resistors/pot.  It could have just been the pots I were using.

What also worked quite well was to thermally bond the pot to the OCXO case... 
poor man's oven stabilization.

---

> When used as a voltage divider (three terminal device) 
the claim by the pot manufacturing OCXO companies is that you are better with
no added resistors.
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Re: [time-nuts] New product: the TAPR "PulsePuppy"

[Bruce Griffiths]

An optional ressistor in series with gate output would be nice for reducing 
aberrations seen at a high impedance load at the end of a piece of 50 ohm coax.

Bruce

> 
> On 24 December 2017 at 13:18 Bob kb8tq  wrote:
> 
> Hi
> 
> There’s a lot of debate out there about that.
> 
> When used as a variable resistor (two terminal device) there is no doubt 
> that a
> sereis resistor can help. When used as a voltage divider (three terminal 
> device)
> the claim by the pot manufacturing OCXO companies is that you are better 
> with
> no added resistors. The material in the pot is all same / same and the TC 
> as a
> divider is quite low. Yes, there are other opinions out there …..
> 
> Bob
> 
> > > 
> > On Dec 23, 2017, at 6:57 PM, Mark Sims  wrote:
> > 
> > Looks good and quite useful.
> > 
> > If you ever re-spin the board, I would recommend including a place 
> > for range limiting resistors on the ends of the EFC adjustment pot. That 
> > way they can be low TCR resistors and the TCR effects of the pot can be 
> > minimized and the EFC adjustment can be made less twitchy. But, at the 
> > expense of possibly needing to tweak the range resistors as the oscillator 
> > ages.
> > 
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Re: [time-nuts] New product: the TAPR "PulsePuppy"

[Bob kb8tq]

Hi

There’s a lot of debate out there about that.

When used as a variable resistor (two terminal device) there is no doubt that a 
sereis resistor can help. When used as a voltage divider (three terminal 
device) 
the claim by the pot manufacturing OCXO companies is that you are better with
no added resistors. The material in the pot is all same / same and the TC as a 
divider is quite low. Yes, there are other opinions out there …..

Bob

> On Dec 23, 2017, at 6:57 PM, Mark Sims  wrote:
> 
> Looks good and quite useful.
> 
> If you ever re-spin the board, I would recommend including a place for range 
> limiting resistors on the ends of the EFC adjustment pot.   That way they can 
> be low TCR resistors and the TCR effects of the pot can be minimized and the 
> EFC adjustment can be made less twitchy.  But, at the expense of possibly 
> needing to tweak the range resistors as the oscillator ages.
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[time-nuts] New product: the TAPR "PulsePuppy"

[Mark Sims]

Looks good and quite useful.

If you ever re-spin the board, I would recommend including a place for range 
limiting resistors on the ends of the EFC adjustment pot.   That way they can 
be low TCR resistors and the TCR effects of the pot can be minimized and the 
EFC adjustment can be made less twitchy.  But, at the expense of possibly 
needing to tweak the range resistors as the oscillator ages.
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Re: [time-nuts] New product: the TAPR "PulsePuppy"

[John Ackermann N8UR]

Absolutely... the plot is mainly to show what to expect from the little OCXO, 
not the board.  It ain't a BVA, but for the price and size, it's not bad.

On Dec 23, 2017, 4:56 PM, at 4:56 PM, Bob kb8tq  wrote:
>Hi
>
>Looks neat !!!
>
>It is a pretty good bet that everything you see in the ADEV plot is a
>function of the 
>specific OCXO you put on the board. Put another way, the. board’s ADEV
>is way
>better than the ADEV of the OCXO. It’s a very safe bet that everything
>past 2 seconds
>or is the OCXO. 
>
>Bob
>
>> On Dec 23, 2017, at 4:00 PM, John Ackermann N8UR 
>wrote:
>> 
>> 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
>>
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Re: [time-nuts] New product: the TAPR "PulsePuppy"

[Bob kb8tq]

Hi

Looks neat !!!

It is a pretty good bet that everything you see in the ADEV plot is a function 
of the 
specific OCXO you put on the board. Put another way, the. board’s ADEV is way
better than the ADEV of the OCXO. It’s a very safe bet that everything past 2 
seconds
or is the OCXO. 

Bob

> On Dec 23, 2017, at 4:00 PM, John Ackermann N8UR  wrote:
> 
> 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
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Re: [time-nuts] New product: the TAPR "PulsePuppy"

[John Ackermann N8UR]

Sorry, a typo got into the URL for the manual.  Remove the extraneous 
"m" after ".pdf": http://www.tapr.org/~n8ur/PulsePuppy_Manual.pdf


On 12/23/2017 04:00 PM, John Ackermann N8UR wrote:
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


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