Empathy List Archives

EK

Erik Kaashoek

Wed, Dec 3, 2025 7:06 AM

To all the great people on this list.
During the last 4 years, next to designing the tinySA and tinyPFA, I
have been working on designing a frequency counter. At the start of
this, longer than expected, project I did not know anything about
frequency counters, frequency stability or frequency/time measurements
and from time to time I have been asking questions to members of this
list. Many members of the list have provided excellent feedback, even
tough my questions must have clearly shown my ignorance. For this I want
to say thanks! Designing a high performance counter is an excellent
learning opportunity!
To capture some of the learning I have created two documents that may be
of interest to other people on this list.
A PDF describing the design, simulation and verification of the GPSDO
inside the counter:
https://kaashoek.com/tinyDevices/RF_Seminar_tinyGTC_GPSDO_Erik.pdf
A PDF describing the phases of, and main learning from the HW design of
the counter:
https://kaashoek.com/tinyDevices/RF_Seminar_tinyGTC_design_Erik.pdf
Just in case you are interested in the end result of this 4 year
project, have a look here:
https://www.tinydevices.org/wiki/pmwiki.php?n=TinyGTC.Homepage
Erik.

To all the great people on this list. During the last 4 years, next to designing the tinySA and tinyPFA, I have been working on designing a frequency counter. At the start of this, longer than expected, project I did not know anything about frequency counters, frequency stability or frequency/time measurements and from time to time I have been asking questions to members of this list. Many members of the list have provided excellent feedback, even tough my questions must have clearly shown my ignorance. For this I want to say thanks! Designing a high performance counter is an excellent learning opportunity! To capture some of the learning I have created two documents that may be of interest to other people on this list. A PDF describing the design, simulation and verification of the GPSDO inside the counter: https://kaashoek.com/tinyDevices/RF_Seminar_tinyGTC_GPSDO_Erik.pdf A PDF describing the phases of, and main learning from the HW design of the counter: https://kaashoek.com/tinyDevices/RF_Seminar_tinyGTC_design_Erik.pdf Just in case you are interested in the end result of this 4 year project, have a look here: https://www.tinydevices.org/wiki/pmwiki.php?n=TinyGTC.Homepage Erik.

BC

Bob Camp

Wed, Dec 3, 2025 3:16 PM

Hi

The TinyGTC is an impressive device. There are an amazing number of features packed into a very small “portable” package.

A couple things (some of which we’ve discussed here in the past):

1)The GPSDO is great for its intended use (frequency standard for a counter). However it’s not really targeted at being a “Time Nut” lab standard. You can only pack just so much into that small package.

2)The inputs are targeted at “modern” ( 0 to 3.3V ) signals. Unlike (say) a 53131 counter, the input channels have limited range / adjustability. The 10V p-p output of your fine old Cs standard should not be fed directly into them. The same is true of things like a pps generated by an RS-232 driver.

3)The internal standard is a TCXO. Without a GPS signal or external reference, that will impact performance. It is better than the XO that might be in your fine old HP counter. Not quite as good as the OCXO option.

Performance wise, it does quite well. It is a competitor for the 5313x series of counters and beats them in a lot of areas. It’s not quite up to the real performance of the 532xx series. As noted in previous posts here, the 532xx series is not without its issues.

Truth in lending: I was a beta tester for the TinyGTC.

Bob

On Dec 3, 2025, at 2:06 AM, Erik Kaashoek via time-nuts time-nuts@lists.febo.com wrote:

To all the great people on this list.
During the last 4 years, next to designing the tinySA and tinyPFA, I have been working on designing a frequency counter. At the start of this, longer than expected, project I did not know anything about frequency counters, frequency stability or frequency/time measurements and from time to time I have been asking questions to members of this list. Many members of the list have provided excellent feedback, even tough my questions must have clearly shown my ignorance. For this I want to say thanks! Designing a high performance counter is an excellent learning opportunity!
To capture some of the learning I have created two documents that may be of interest to other people on this list.
A PDF describing the design, simulation and verification of the GPSDO inside the counter: https://kaashoek.com/tinyDevices/RF_Seminar_tinyGTC_GPSDO_Erik.pdf
A PDF describing the phases of, and main learning from the HW design of the counter: https://kaashoek.com/tinyDevices/RF_Seminar_tinyGTC_design_Erik.pdf
Just in case you are interested in the end result of this 4 year project, have a look here: https://www.tinydevices.org/wiki/pmwiki.php?n=TinyGTC.Homepage
Erik.

time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe send an email to time-nuts-leave@lists.febo.com

Hi The TinyGTC *is* an impressive device. There are an amazing number of features packed into a very small “portable” package. A couple things (some of which we’ve discussed here in the past): 1)The GPSDO is great for its intended use (frequency standard for a counter). However it’s not really targeted at being a “Time Nut” lab standard. You can only pack just so much into that small package. 2)The inputs are targeted at “modern” ( 0 to 3.3V ) signals. Unlike (say) a 53131 counter, the input channels have limited range / adjustability. The 10V p-p output of your fine old Cs standard should *not* be fed directly into them. The same is true of things like a pps generated by an RS-232 driver. 3)The internal standard is a TCXO. Without a GPS signal or external reference, that will impact performance. It is better than the XO that might be in your fine old HP counter. Not quite as good as the OCXO option. Performance wise, it does quite well. It is a competitor for the 5313x series of counters and beats them in a lot of areas. It’s not quite up to the real performance of the 532xx series. As noted in previous posts here, the 532xx series is not without its issues. Truth in lending: I was a beta tester for the TinyGTC. Bob > On Dec 3, 2025, at 2:06 AM, Erik Kaashoek via time-nuts <time-nuts@lists.febo.com> wrote: > > To all the great people on this list. > During the last 4 years, next to designing the tinySA and tinyPFA, I have been working on designing a frequency counter. At the start of this, longer than expected, project I did not know anything about frequency counters, frequency stability or frequency/time measurements and from time to time I have been asking questions to members of this list. Many members of the list have provided excellent feedback, even tough my questions must have clearly shown my ignorance. For this I want to say thanks! Designing a high performance counter is an excellent learning opportunity! > To capture some of the learning I have created two documents that may be of interest to other people on this list. > A PDF describing the design, simulation and verification of the GPSDO inside the counter: https://kaashoek.com/tinyDevices/RF_Seminar_tinyGTC_GPSDO_Erik.pdf > A PDF describing the phases of, and main learning from the HW design of the counter: https://kaashoek.com/tinyDevices/RF_Seminar_tinyGTC_design_Erik.pdf > Just in case you are interested in the end result of this 4 year project, have a look here: https://www.tinydevices.org/wiki/pmwiki.php?n=TinyGTC.Homepage > Erik. > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe send an email to time-nuts-leave@lists.febo.com

JL

Jim Lux

Thu, Dec 4, 2025 12:19 AM

Nice work...

"Reality is more complex" you don't say...

On Wed, 3 Dec 2025 08:06:30 +0100, Erik Kaashoek via time-nuts time-nuts@lists.febo.com wrote:

To all the great people on this list.
During the last 4 years, next to designing the tinySA and tinyPFA, I
have been working on designing a frequency counter. At the start of
this, longer than expected, project I did not know anything about
frequency counters, frequency stability or frequency/time measurements
and from time to time I have been asking questions to members of this
list. Many members of the list have provided excellent feedback, even
tough my questions must have clearly shown my ignorance. For this I want
to say thanks! Designing a high performance counter is an excellent
learning opportunity!
To capture some of the learning I have created two documents that may be
of interest to other people on this list.
A PDF describing the design, simulation and verification of the GPSDO
inside the counter:
https://kaashoek.com/tinyDevices/RF_Seminar_tinyGTC_GPSDO_Erik.pdf
A PDF describing the phases of, and main learning from the HW design of
the counter:
https://kaashoek.com/tinyDevices/RF_Seminar_tinyGTC_design_Erik.pdf
Just in case you are interested in the end result of this 4 year
project, have a look here:
https://www.tinydevices.org/wiki/pmwiki.php?n=TinyGTC.Homepage
Erik.

time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe send an email to time-nuts-leave@lists.febo.com

Nice work... "Reality is more complex" you don't say... On Wed, 3 Dec 2025 08:06:30 +0100, Erik Kaashoek via time-nuts <time-nuts@lists.febo.com> wrote: To all the great people on this list. During the last 4 years, next to designing the tinySA and tinyPFA, I have been working on designing a frequency counter. At the start of this, longer than expected, project I did not know anything about frequency counters, frequency stability or frequency/time measurements and from time to time I have been asking questions to members of this list. Many members of the list have provided excellent feedback, even tough my questions must have clearly shown my ignorance. For this I want to say thanks! Designing a high performance counter is an excellent learning opportunity! To capture some of the learning I have created two documents that may be of interest to other people on this list. A PDF describing the design, simulation and verification of the GPSDO inside the counter: https://kaashoek.com/tinyDevices/RF_Seminar_tinyGTC_GPSDO_Erik.pdf A PDF describing the phases of, and main learning from the HW design of the counter: https://kaashoek.com/tinyDevices/RF_Seminar_tinyGTC_design_Erik.pdf Just in case you are interested in the end result of this 4 year project, have a look here: https://www.tinydevices.org/wiki/pmwiki.php?n=TinyGTC.Homepage Erik. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe send an email to time-nuts-leave@lists.febo.com

TV

Tom Van Baak

Thu, Dec 4, 2025 1:18 AM

Thanks for the announcement, and congratulations Erik!

This has been a long road and it's been fun watching you grow every step
of the way: many many steps. I checked my mailbox and found over 700
postings or emails about your project since 2021.

Your "tiny" devices are a gift to time-nuts and we appreciate seeing
your curiosity and passion converted into useful tools. I can't imagine
what your next challenge is. A tinySDR? A tinyMHM (H-maser)? A tinyOLC
(optical lattice clock)? A tinyLLM ;-)

I bought a tinyPFA and tinyGTC from www2.randl.com per your
recommendation [1]. I also see them available on Amazon and eBay,
possibly of questionable pricing or origin. Can you comment on that?

/tvb

[1] Under "Where to buy" at
https://www.tinydevices.org/wiki/pmwiki.php?n=TinyGTC.Homepage

Thanks for the announcement, and congratulations Erik! This has been a long road and it's been fun watching you grow every step of the way: many many steps. I checked my mailbox and found over 700 postings or emails about your project since 2021. Your "tiny" devices are a gift to time-nuts and we appreciate seeing your curiosity and passion converted into useful tools. I can't imagine what your next challenge is. A tinySDR? A tinyMHM (H-maser)? A tinyOLC (optical lattice clock)? A tinyLLM ;-) I bought a tinyPFA and tinyGTC from www2.randl.com per your recommendation [1]. I also see them available on Amazon and eBay, possibly of questionable pricing or origin. Can you comment on that? /tvb [1] Under "Where to buy" at https://www.tinydevices.org/wiki/pmwiki.php?n=TinyGTC.Homepage

EK

Erik Kaashoek

Thu, Dec 4, 2025 6:22 AM

Hi Tom,
Thanks for the kind words.
Currently (and I hope for a long time) there are no clones, but buying
from an authorized reseller is safe as you get excellent support in case
of HW problems.
Current sellers on Amazon are asking inflated prices compared to R&L and
you will get the same service from R&L if needed.
Its is expected the list of resellers under "Where to buy" will grow
over time
Erik.

On 4-12-2025 2:18, Tom Van Baak via time-nuts wrote:

Thanks for the announcement, and congratulations Erik!

This has been a long road and it's been fun watching you grow every
step of the way: many many steps. I checked my mailbox and found over
700 postings or emails about your project since 2021.

Your "tiny" devices are a gift to time-nuts and we appreciate seeing
your curiosity and passion converted into useful tools. I can't
imagine what your next challenge is. A tinySDR? A tinyMHM (H-maser)? A
tinyOLC (optical lattice clock)? A tinyLLM ;-)

I bought a tinyPFA and tinyGTC from www2.randl.com per your
recommendation [1]. I also see them available on Amazon and eBay,
possibly of questionable pricing or origin. Can you comment on that?

/tvb

[1] Under "Where to buy" at
https://www.tinydevices.org/wiki/pmwiki.php?n=TinyGTC.Homepage

time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe send an email to time-nuts-leave@lists.febo.com

Hi Tom, Thanks for the kind words. Currently (and I hope for a long time) there are no clones, but buying from an authorized reseller is safe as you get excellent support in case of HW problems. Current sellers on Amazon are asking inflated prices compared to R&L and you will get the same service from R&L if needed. Its is expected the list of resellers under "Where to buy" will grow over time Erik. On 4-12-2025 2:18, Tom Van Baak via time-nuts wrote: > Thanks for the announcement, and congratulations Erik! > > This has been a long road and it's been fun watching you grow every > step of the way: many many steps. I checked my mailbox and found over > 700 postings or emails about your project since 2021. > > Your "tiny" devices are a gift to time-nuts and we appreciate seeing > your curiosity and passion converted into useful tools. I can't > imagine what your next challenge is. A tinySDR? A tinyMHM (H-maser)? A > tinyOLC (optical lattice clock)? A tinyLLM ;-) > > I bought a tinyPFA and tinyGTC from www2.randl.com per your > recommendation [1]. I also see them available on Amazon and eBay, > possibly of questionable pricing or origin. Can you comment on that? > > /tvb > > [1] Under "Where to buy" at > https://www.tinydevices.org/wiki/pmwiki.php?n=TinyGTC.Homepage > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe send an email to time-nuts-leave@lists.febo.com

J

jmfriedt

Thu, Dec 4, 2025 9:09 AM

Is there a rationale for keeping the firmware closed source? I wanted
to expand the capability of the TinyPFA beyond the NanoVNA hardware
(more channels) but lacking the source code, I am restarting from
scratch.

Thanks, Jean-Michel

Thanks for the kind words.
Currently (and I hope for a long time) there are no clones, but
buying from an authorized reseller is safe as you get excellent
support in case of HW problems.
Current sellers on Amazon are asking inflated prices compared to R&L
and you will get the same service from R&L if needed.
Its is expected the list of resellers under "Where to buy" will grow
over time
Erik.

On 4-12-2025 2:18, Tom Van Baak via time-nuts wrote:

Thanks for the announcement, and congratulations Erik!

This has been a long road and it's been fun watching you grow every
step of the way: many many steps. I checked my mailbox and found
over 700 postings or emails about your project since 2021.

Your "tiny" devices are a gift to time-nuts and we appreciate
seeing your curiosity and passion converted into useful tools. I
can't imagine what your next challenge is. A tinySDR? A tinyMHM
(H-maser)? A tinyOLC (optical lattice clock)? A tinyLLM ;-)

I bought a tinyPFA and tinyGTC from www2.randl.com per your
recommendation [1]. I also see them available on Amazon and eBay,
possibly of questionable pricing or origin. Can you comment on that?

/tvb

[1] Under "Where to buy" at
https://www.tinydevices.org/wiki/pmwiki.php?n=TinyGTC.Homepage

time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe send an email to time-nuts-leave@lists.febo.com

--
JM Friedt, FEMTO-ST Time & Frequency, 26 rue de l'Epitaphe, 25000
Besancon, France

Is there a rationale for keeping the firmware closed source? I wanted to expand the capability of the TinyPFA beyond the NanoVNA hardware (more channels) but lacking the source code, I am restarting from scratch. Thanks, Jean-Michel > Thanks for the kind words. > Currently (and I hope for a long time) there are no clones, but > buying from an authorized reseller is safe as you get excellent > support in case of HW problems. > Current sellers on Amazon are asking inflated prices compared to R&L > and you will get the same service from R&L if needed. > Its is expected the list of resellers under "Where to buy" will grow > over time > Erik. > > On 4-12-2025 2:18, Tom Van Baak via time-nuts wrote: > > Thanks for the announcement, and congratulations Erik! > > > > This has been a long road and it's been fun watching you grow every > > step of the way: many many steps. I checked my mailbox and found > > over 700 postings or emails about your project since 2021. > > > > Your "tiny" devices are a gift to time-nuts and we appreciate > > seeing your curiosity and passion converted into useful tools. I > > can't imagine what your next challenge is. A tinySDR? A tinyMHM > > (H-maser)? A tinyOLC (optical lattice clock)? A tinyLLM ;-) > > > > I bought a tinyPFA and tinyGTC from www2.randl.com per your > > recommendation [1]. I also see them available on Amazon and eBay, > > possibly of questionable pricing or origin. Can you comment on that? > > > > /tvb > > > > [1] Under "Where to buy" at > > https://www.tinydevices.org/wiki/pmwiki.php?n=TinyGTC.Homepage > > _______________________________________________ > > time-nuts mailing list -- time-nuts@lists.febo.com > > To unsubscribe send an email to time-nuts-leave@lists.febo.com > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe send an email to time-nuts-leave@lists.febo.com > > > > -- JM Friedt, FEMTO-ST Time & Frequency, 26 rue de l'Epitaphe, 25000 Besancon, France

EK

Erik Kaashoek

Thu, Dec 4, 2025 2:09 PM

The firmware of the tinyPFA is open source, see:
https://github.com/erikkaashoek/NanoVNA-D/tree/DMTD
Erik.

On 4-12-2025 10:09, jmfriedt via time-nuts wrote:

Is there a rationale for keeping the firmware closed source? I wanted
to expand the capability of the TinyPFA beyond the NanoVNA hardware
(more channels) but lacking the source code, I am restarting from
scratch.

Thanks, Jean-Michel

Thanks for the kind words.
Currently (and I hope for a long time) there are no clones, but
buying from an authorized reseller is safe as you get excellent
support in case of HW problems.
Current sellers on Amazon are asking inflated prices compared to R&L
and you will get the same service from R&L if needed.
Its is expected the list of resellers under "Where to buy" will grow
over time
Erik.

On 4-12-2025 2:18, Tom Van Baak via time-nuts wrote:

Thanks for the announcement, and congratulations Erik!

This has been a long road and it's been fun watching you grow every
step of the way: many many steps. I checked my mailbox and found
over 700 postings or emails about your project since 2021.

Your "tiny" devices are a gift to time-nuts and we appreciate
seeing your curiosity and passion converted into useful tools. I
can't imagine what your next challenge is. A tinySDR? A tinyMHM
(H-maser)? A tinyOLC (optical lattice clock)? A tinyLLM ;-)

I bought a tinyPFA and tinyGTC from www2.randl.com per your
recommendation [1]. I also see them available on Amazon and eBay,
possibly of questionable pricing or origin. Can you comment on that?

/tvb

[1] Under "Where to buy" at
https://www.tinydevices.org/wiki/pmwiki.php?n=TinyGTC.Homepage

time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe send an email to time-nuts-leave@lists.febo.com

The firmware of the tinyPFA is open source, see: https://github.com/erikkaashoek/NanoVNA-D/tree/DMTD Erik. On 4-12-2025 10:09, jmfriedt via time-nuts wrote: > Is there a rationale for keeping the firmware closed source? I wanted > to expand the capability of the TinyPFA beyond the NanoVNA hardware > (more channels) but lacking the source code, I am restarting from > scratch. > > Thanks, Jean-Michel > >> Thanks for the kind words. >> Currently (and I hope for a long time) there are no clones, but >> buying from an authorized reseller is safe as you get excellent >> support in case of HW problems. >> Current sellers on Amazon are asking inflated prices compared to R&L >> and you will get the same service from R&L if needed. >> Its is expected the list of resellers under "Where to buy" will grow >> over time >> Erik. >> >> On 4-12-2025 2:18, Tom Van Baak via time-nuts wrote: >>> Thanks for the announcement, and congratulations Erik! >>> >>> This has been a long road and it's been fun watching you grow every >>> step of the way: many many steps. I checked my mailbox and found >>> over 700 postings or emails about your project since 2021. >>> >>> Your "tiny" devices are a gift to time-nuts and we appreciate >>> seeing your curiosity and passion converted into useful tools. I >>> can't imagine what your next challenge is. A tinySDR? A tinyMHM >>> (H-maser)? A tinyOLC (optical lattice clock)? A tinyLLM ;-) >>> >>> I bought a tinyPFA and tinyGTC from www2.randl.com per your >>> recommendation [1]. I also see them available on Amazon and eBay, >>> possibly of questionable pricing or origin. Can you comment on that? >>> >>> /tvb >>> >>> [1] Under "Where to buy" at >>> https://www.tinydevices.org/wiki/pmwiki.php?n=TinyGTC.Homepage >>> _______________________________________________ >>> time-nuts mailing list -- time-nuts@lists.febo.com >>> To unsubscribe send an email to time-nuts-leave@lists.febo.com >> _______________________________________________ >> time-nuts mailing list -- time-nuts@lists.febo.com >> To unsubscribe send an email to time-nuts-leave@lists.febo.com >> >> >> >> > >

J

jmfriedt

Thu, Dec 4, 2025 3:17 PM

My apologies: finding only http://athome.kaashoek.com/tinyPFA/DFU/ I
was under the mistaken assumption that the firmware was closed source,
I had not identified the following github url, thank you for the
information.

Best, Jean-Michel

The firmware of the tinyPFA is open source, see:
https://github.com/erikkaashoek/NanoVNA-D/tree/DMTD
Erik.

On 4-12-2025 10:09, jmfriedt via time-nuts wrote:

Is there a rationale for keeping the firmware closed source? I
wanted to expand the capability of the TinyPFA beyond the NanoVNA
hardware (more channels) but lacking the source code, I am
restarting from scratch.

Thanks, Jean-Michel

Thanks for the kind words.
Currently (and I hope for a long time) there are no clones, but
buying from an authorized reseller is safe as you get excellent
support in case of HW problems.
Current sellers on Amazon are asking inflated prices compared to
R&L and you will get the same service from R&L if needed.
Its is expected the list of resellers under "Where to buy" will
grow over time
Erik.

On 4-12-2025 2:18, Tom Van Baak via time-nuts wrote:

Thanks for the announcement, and congratulations Erik!

This has been a long road and it's been fun watching you grow
every step of the way: many many steps. I checked my mailbox and
found over 700 postings or emails about your project since 2021.

Your "tiny" devices are a gift to time-nuts and we appreciate
seeing your curiosity and passion converted into useful tools. I
can't imagine what your next challenge is. A tinySDR? A tinyMHM
(H-maser)? A tinyOLC (optical lattice clock)? A tinyLLM ;-)

I bought a tinyPFA and tinyGTC from www2.randl.com per your
recommendation [1]. I also see them available on Amazon and eBay,
possibly of questionable pricing or origin. Can you comment on
that?

/tvb

[1] Under "Where to buy" at
https://www.tinydevices.org/wiki/pmwiki.php?n=TinyGTC.Homepage

time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe send an email to time-nuts-leave@lists.febo.com

--
JM Friedt, FEMTO-ST Time & Frequency, 26 rue de l'Epitaphe, 25000
Besancon, France

My apologies: finding only http://athome.kaashoek.com/tinyPFA/DFU/ I was under the mistaken assumption that the firmware was closed source, I had not identified the following github url, thank you for the information. Best, Jean-Michel > The firmware of the tinyPFA is open source, see: > https://github.com/erikkaashoek/NanoVNA-D/tree/DMTD > Erik. > > On 4-12-2025 10:09, jmfriedt via time-nuts wrote: > > Is there a rationale for keeping the firmware closed source? I > > wanted to expand the capability of the TinyPFA beyond the NanoVNA > > hardware (more channels) but lacking the source code, I am > > restarting from scratch. > > > > Thanks, Jean-Michel > > > >> Thanks for the kind words. > >> Currently (and I hope for a long time) there are no clones, but > >> buying from an authorized reseller is safe as you get excellent > >> support in case of HW problems. > >> Current sellers on Amazon are asking inflated prices compared to > >> R&L and you will get the same service from R&L if needed. > >> Its is expected the list of resellers under "Where to buy" will > >> grow over time > >> Erik. > >> > >> On 4-12-2025 2:18, Tom Van Baak via time-nuts wrote: > >>> Thanks for the announcement, and congratulations Erik! > >>> > >>> This has been a long road and it's been fun watching you grow > >>> every step of the way: many many steps. I checked my mailbox and > >>> found over 700 postings or emails about your project since 2021. > >>> > >>> Your "tiny" devices are a gift to time-nuts and we appreciate > >>> seeing your curiosity and passion converted into useful tools. I > >>> can't imagine what your next challenge is. A tinySDR? A tinyMHM > >>> (H-maser)? A tinyOLC (optical lattice clock)? A tinyLLM ;-) > >>> > >>> I bought a tinyPFA and tinyGTC from www2.randl.com per your > >>> recommendation [1]. I also see them available on Amazon and eBay, > >>> possibly of questionable pricing or origin. Can you comment on > >>> that? > >>> > >>> /tvb > >>> > >>> [1] Under "Where to buy" at > >>> https://www.tinydevices.org/wiki/pmwiki.php?n=TinyGTC.Homepage > >>> _______________________________________________ > >>> time-nuts mailing list -- time-nuts@lists.febo.com > >>> To unsubscribe send an email to time-nuts-leave@lists.febo.com > >> _______________________________________________ > >> time-nuts mailing list -- time-nuts@lists.febo.com > >> To unsubscribe send an email to time-nuts-leave@lists.febo.com > >> > >> > >> > >> > > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe send an email to time-nuts-leave@lists.febo.com > > > > -- JM Friedt, FEMTO-ST Time & Frequency, 26 rue de l'Epitaphe, 25000 Besancon, France

time-nuts@lists.febo.com

Thanks for all the help during the design of the tinyGTC