On Fri, Dec 09, 2016 at 08:25:52PM -0800, Chris Albertson wrote:
> Lowest price I've found is BasicPCB.com They charge $3 per
> square inch for 2 layers with mask and legend.
OSHpark charges $5 per square inch for the standard 2 layer
order (which include three boards, i.e. actually 3 square
inch
On Thu, Aug 04, 2016 at 06:26:28PM -0400, Bob Camp wrote:
> Hi
Hey Bob!
>> On Aug 4, 2016, at 5:29 PM, Herbert Poetzl wrote:
>> Dear fellow time-nuts!
>> I'm currently investigating my options regarding
>> GPS antennae (of course for time related purposes)
&
Dear fellow time-nuts!
I'm currently investigating my options regarding
GPS antennae (of course for time related purposes)
and I'm really confused by the variety they come
in ... (my apologies in advance for the long post).
Setting:
I'm living in a three storey house with a sloped
roof, a cov
On Tue, Jun 14, 2016 at 07:19:54AM -0700, Nick Sayer via time-nuts wrote:
> That’s not a USB chip, it’s an RS-232 level converter.
> I am not aware of any USB 2 UART devices (that doesn’t
> necessarily mean much). They just don’t need to be that fast.
All modern FTDIs are USB 2.0 (for example the
On Fri, Jun 10, 2016 at 05:05:28PM +0200, tim...@timeok.it wrote:
> Hi all,
> I have posted here my experience with the installation of the
> band pass filter in front of the lamp of the HP5065A.
> http://www.timeok.it/wp/wp-content/uploads/2015/08/HP5065A-Super-upgrade-v-1.4.pdf
Hmm, on the fir
On Fri, May 13, 2016 at 07:51:07PM +0200, Attila Kinali wrote:
> On Fri, 13 May 2016 07:36:10 -0400
> Bob Camp wrote:
>> Given that a “real” TDC is a resistor and capacitor
>> attached to a FPGA pin (plus the ADC) the cost of doing it
>> better is not all that much. You can get down to a few hund
On Thu, Apr 14, 2016 at 10:18:22PM +0200, Wolfgang Wallner wrote:
> Dear Timenuts community,
Wolfgang,
> I would like to announce the public availabilty of two software projects
> which I have been working on for my master thesis:
> * LibPLN: a portable C++ library for the efficient simulation
as 0.04 ppm.
>>> Bob
>>>> Mike
>>>>> That can be filtered out with a RF filter. The same is true with a
>>> (somewhat more
>>>>> complex) filter on the 10 MHz output.
>>>>> In addition to the “big” RF spurs, you ge
gt; of pulse drop and add is not as simple as you might hope.
> The low frequency part of the jitter (and it will be there) is
> no different than the noise on a 1 pps output. You still need
> to do very long time constant (or very narrow band) filtering
> to take it out.
> Bo
On Mon, Apr 04, 2016 at 06:07:54PM -0700, Alexander Pummer wrote:
> and it is relative easy to make 10MHz from 8MHz with analog
> frequency manipulation, which generates less jitter
Could you elaborate on this a little if time permits?
I'm more a 'digital person' but it sounds interesting.
Thank
On Sun, Mar 27, 2016 at 11:25:36PM +0300, Oleg Skydan wrote:
> Hi list,
> I am in a process of making a low noise frequency
> synthesizer for the 1st LO for my new DSP HF transceiver
> (http://neon.skydan.in.ua). This list is not directly
> related to my project, but I found a lot of useful
> in
On Sun, Mar 27, 2016 at 07:45:23PM +, Bob Albert via time-nuts wrote:
> Does anyone know of an inexpensive prescaler for a counter
> that goes beyond 2 GHz?
A few years ago, I was looking for something cheap to build
a PIC based GHz counter and I stumbled over the LMX23xx
chips from TI (PLL
On Sat, Mar 26, 2016 at 10:33:12PM -0400, John Ackermann N8UR wrote:
> If there is enough interest, TAPR could consider doing a
> production run.
> If not, I'll release the design package including Gerbers.
I'd be very interested in the design files, i.e.
schematic and gerbers regardless of the
On Tue, Jan 26, 2016 at 06:57:54AM +, Mark Sims wrote:
> Actually not hard to do... lay out circuit board (free version
> of Eagle), have boards fab'd at Oshpark.com or your favorite
> Chinese proto shop (I like gojgo.com). Have solder paste
> stencil made at oshstencils.com. Squeege solder pas
On Thu, Dec 03, 2015 at 01:53:25PM +0100, Attila Kinali wrote:
> On Wed, 2 Dec 2015 21:12:42 -0500
> Ian Stirling wrote:
>> Here's a video of Dave Jones soldering a QFN chip.
>> http://www.eevblog.com/2013/01/08/eevblog-408-schmart-board-0-4mm-qfn-smd-soldering/
> Unfortunately, this technique
On Tue, Dec 01, 2015 at 08:33:05PM -0500, paul swed wrote:
> Digikey was a strike out with 1 filter for 86 cents but
> order was 1000 units.
Sorry, but could you point me to the filter in question
please, I couldn't find anything on digikey, but probably
I was searching for the wrong keywords.
T
On Mon, Aug 05, 2013 at 06:35:25AM -0700, M. Simon wrote:
> A while back some of the folks on the list were discussing
> RS-232 interfacing.
> I may have something useful for those of you still wrestling
> with the problem. An RS-232 interface (Male or Female DB-9)
> that can take any voltage fro
On Tue, May 28, 2013 at 08:58:19PM -0700, ed breya wrote:
> Does anyone know what 50.791095 MHz was used for?
No idea, but playing around with the number resulted in:
50.791095 * 20 / 9 = 1128691
which is a prime :)
best,
Herbert
> I assume it was some sort of telecom clocking rat
On Sun, May 26, 2013 at 11:38:35AM -0600, Brent Gordon wrote:
> The two threads here, "Good (cheap) PIC chip choice for
> project?" and "Follow-up question re: microcontroller
> families" have a lot of good information.
> A more organized approach is available at the Digi-Key/De
On Sun, May 26, 2013 at 07:46:38AM -0400, Bob Camp wrote:
> Hi
> On May 25, 2013, at 11:26 PM, Herbert Poetzl wrote:
>> On Sat, May 25, 2013 at 09:26:02PM -0400, Bob Camp wrote:
>>> Hi
>>> I realize this is a bit like water torture - sorry about that.
>>&
missing
certain features like the uart or logic analyzer.
Just google for a comparison (PICkit 2 vs PICkit 3)
to get an idea :)
Best,
Herbert
> Bob
> On May 25, 2013, at 10:20 PM, Herbert Poetzl wrote:
>> On Sat, May 25, 2013 at 10:04:59PM -0400, Bob Camp wrote:
>>> Hi
&
On Sat, May 25, 2013 at 09:26:02PM -0400, Bob Camp wrote:
> Hi
> I realize this is a bit like water torture - sorry about that.
> If I go to Microchip Direct and ask for a PIC 18F with two
> UARTS and two A/D's I get the PIC18F86J72 and PIC 18F87J72.
> To me the second one is the obvious winner.
RT/I2C/SPI).
But as always, YMMV.
best,
Herbert
> Bob
> On May 25, 2013, at 9:44 PM, Herbert Poetzl wrote:
>> On Sat, May 25, 2013 at 08:46:03AM -0500, Jason Rabel wrote:
>>> I've decided I finally want to tackle learning how to use a PIC
>>> chip for some smaller
On Sat, May 25, 2013 at 08:46:03AM -0500, Jason Rabel wrote:
> I've decided I finally want to tackle learning how to use a PIC
> chip for some smaller projects. Can someone recommend me a good
> (and cheap) PIC, and possible some literature (be it a book or
> website)? I have a fairly recent willem
On Sat, May 25, 2013 at 04:03:36PM -0700, Chris Albertson wrote:
> In general PICs need assembly language for many things.
> AVRs almost never need assembly.
I've done quite a number of PIC projects, from low end
8 bit up to the high end 32 bit controllers, and except
for a really time critical s
On Sat, May 25, 2013 at 05:06:57PM +, li...@lazygranch.com wrote:
> Flightradar24 is using beagle bones in their ADS-B/mode-s
> system and will be incorporating MLAT soon. I suspect they work
> well in timing applications.
> That said, the Allwinner they sell on Sparkfun will probably be
> my
On Tue, May 14, 2013 at 08:10:38PM -0700, Peter Monta wrote:
>>> Bulk transfer might work well on a system where nothing else is going
>> on,
>>> so "best effort" translates to "now".
>> Does it mean "now" or "next polling cycle"?
> It means "now", or pretty close. No waiting for
> start-of-USB
On Tue, May 14, 2013 at 03:11:58PM -0700, Hal Murray wrote:
> jim...@earthlink.net said:
>> Bulk transfer might work well on a system where nothing else
>> is going on, so "best effort" translates to "now".
> Does it mean "now" or "next polling cycle"?
It's always 'next polling cycle' because al
On Tue, May 14, 2013 at 12:40:01AM -0700, Peter Monta wrote:
>> IMHO the transfer mode of choice for this purpose should
>> be the Isochronous Transfer (in USB 2.0 and 3.0) because
>> it happens periodically and thus can achieve a guaranteed
>> maximum latency (for high speed this means 125us).
>
On Mon, May 13, 2013 at 08:36:14PM -0700, Peter Monta wrote:
> I wonder if the following scheme would work to improve
> measurement precision over USB for use with GPS devices
> or similar.
> Instead of USB interrupt transfers, which occur on 1 ms
> boundaries with some unknown epoch, use bulk tr
On Sun, Apr 21, 2013 at 11:21:33AM -0700, J. Forster wrote:
> As you may know, some time ago, I acquired an all-but-mythical
> APN-9A LORAN-A receiver/Indicator.
> This is not the common APN-9 LORAN-A, but is a hybrid
> (analog/digital) version built for the B-36 bomber.
> Very few were built and
On Sat, Apr 20, 2013 at 08:14:06PM +, Poul-Henning Kamp wrote:
> I looked at the DAC1220 first, but in an EFC application it
> worries me to no end that it is a Sigma-Delta DAC.
> Even if I feed it a clock divided down from the OCXO you're
> EFC'ing, to avoid beatfrequency effects, I would st
On Fri, Apr 19, 2013 at 09:20:05AM -0400, ewkeh...@aol.com wrote:
> As one of our digital loop projects we took a very, very close
> look at it, but thought once you consider the application,
> requirements of external references, its influence on
> temperature performance and cost,
ormation about the involved components.
best,
Herbert
> -mark
> -Original Message-
> From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
> Behalf Of Herbert Poetzl
> Sent: Thursday, 18 April 2013 12:43 AM
> To: Discussion of precise time and frequency
On Wed, Apr 17, 2013 at 08:31:49AM +, Mark C. Stephens wrote:
> I have dumped the 4 flash ROMS from my latest Z3805A but
> I can't make head nor tail of the contents.
> I am thinking the flash are interleaved.
Interleaving makes sense for performance reasons and
usually happens at bit or by
hat will
>> help you get familiar with the family line. If you have problems with the
>> link
>> let me know. Also, after you get a successful download let me know so I
>> can
>> reduce the FTP storage level, thank you.
>> http://pages.suddenlink.net/stevewingate
On Sun, Apr 07, 2013 at 12:41:10AM +0100, Alexander Wright wrote:
> Hi all,
> I've recently ripped some FE-5650A's out of some old equipment,
> but they seem to be a custom build, here you can see they have
> the option just listed as "-":
> http://cambridge.m0tei.co.uk/files/IMG_20130330_232647.jp
On Thu, Apr 04, 2013 at 02:54:09PM -0400, Paul wrote:
>1 3 0 9 4 1 4 2 8 4 4 = 1309412844
>>> I can see its transmitting the even second time but what format
>>> is this and how can I use it?
>> $ date +"%s" # unix time (seconds since Jan, 1st, 1970)
>> 1365086814
>> so, my guess
On Thu, Apr 04, 2013 at 08:28:58AM -0700, Jim Lux wrote:
> On 4/4/13 7:52 AM, Herbert Poetzl wrote:
>> On Thu, Apr 04, 2013 at 02:32:09PM +, Mark C. Stephens wrote:
>>> I wanted to have a look at what the Z3805A puts out on Port 2.
>>> I can see the LEDS flickeri
On Thu, Apr 04, 2013 at 02:32:09PM +, Mark C. Stephens wrote:
> I wanted to have a look at what the Z3805A puts out on Port 2.
> I can see the LEDS flickering on the BOB so its saying something.
> I connected up a terminal program set to 96008N1 and it seems there is
> nothing.
> So I plugged
On Wed, Mar 20, 2013 at 01:48:59PM +0100, Attila Kinali wrote:
> On Mon, 18 Mar 2013 09:21:57 +0100
> "Pieter ten Pierick" wrote:
>>> The -T models are not that expensive. The problem is that you
>>> have to buy them in batches >30 to get down to a reasonable
>>> price. U-blox seems to have taken
u got a problem I guess :)
best,
Herbert
> -Chuck Harris
> Herbert Poetzl wrote:
>> On Wed, Mar 20, 2013 at 02:34:19AM -0400, Bill S wrote:
>>> Interestingly, I have three timepieces that will no longer
>>> synch to wwvb.Two Radio Shack digital clocks and a Casio
>
On Wed, Mar 20, 2013 at 02:34:19AM -0400, Bill S wrote:
> Interestingly, I have three timepieces that will no longer
> synch to wwvb.Two Radio Shack digital clocks and a Casio
> wristwatch that I've worn for a couple of years and was always
> pretty much dead on. Like Paul, I have an analog Lacros
On Mon, Mar 18, 2013 at 07:34:26PM +0100, Volker Esper wrote:
> Am 18.03.2013 18:00, schrieb Herbert Poetzl:
>> The manual also states that error codes 19-23 are the
>> same as the start values (n - 16), so 23 minus 16 should
>> be the same as '7' i.e. 'stop l
On Mon, Mar 18, 2013 at 04:28:32PM +0100, Volker Esper wrote:
> Hi all,
> While auto calibrating the SR620 I get the message "cal error
> 23" - the manual isn't that specific about this message, it
> only states, that error numbers 19 to 23 are caused by Stop
> TAC problems.
The manua
On Sun, Mar 17, 2013 at 08:24:37PM -0400, brucekar...@aol.com wrote:
> I am afraid the PRS-10 lamp starting algorithm is a little involved.
> I believe that once the lamp temperature is in the starting
> range, the microprocessor ramps up the drain and possibly gate
> voltage of the heating o
On Sat, Mar 16, 2013 at 05:41:11AM -0400, gandal...@aol.com wrote:
> I've had an "interesting" week or so playing with an X72 and
> it turned out not to be quite as straightforward as I first
> expected.
> A google based "X72" search of the list archives seems to throw
> up more questions than ans
On Mon, Mar 04, 2013 at 02:29:53PM -0500, Mike Garvey wrote:
> Does anyone have Application Bulletin 23 (IEEE STD-488)
> for the Fluke 1953A Counter?
JFI: they seem to be sold for about 10 USD on ebay
best,
Herbert
> Thanks, Mike
> Michael Garvey
> 85 Monument Avenue
> Swampscott, MA 01907-190
On Fri, Mar 01, 2013 at 07:05:52PM +, Geoff Blake wrote:
> Some two years back, Ian Muir (AKA Gonzo?) produced a
> breakout board for the FE 5860A, one of which I have.
FE-5680A I presume?
> Needless to say, I managed to loose (tidy away!) the
> documentation.
Do you have a picture of that
On Thu, Feb 28, 2013 at 01:26:17AM +0100, Azelio Boriani wrote:
> First try at a simple GPSDO for the RaspberryPi. See here:
> http://www.c-c-i.com/exchange/ for the file PiAutoTIC1.zip
> Thanks to Bob Smither for his file exchange site.
Pardon my ignorance, but where does the 161ms PPS length
com
On Thu, Feb 28, 2013 at 03:49:55AM +0100, Magnus Danielson wrote:
> On 02/18/2013 10:32 PM, Herbert Poetzl wrote:
>> [ lot of stuff zapped ]
> It would be interesting if fractional resolution of the DDS
> would be developed using the PHASE interface.
> As PHASE ripples, a
On Fri, Feb 22, 2013 at 06:01:46PM -0500, paul swed wrote:
> Donald from what I have been seeing they are consistent.
> But there is a 1 hour period up around 1 or 2 pm est that
> they go back to the old modulation and that allows time
> clocks to lock.
Just for information here (from their web
On Tue, Feb 19, 2013 at 04:58:04PM -0800, Paul Cianciolo wrote:
> Hello Folks,
First, I cannot speak for the list, as I'm quite new here,
but in general 'Thread Hijacking' is frowned upon :)
(read: start your own thread :)
> I am working on a project intended to convert an analog ECG
> signal to
I'm new to the time-nuts community, so I simply start
with a short info on how I got into this situation :)
(skip forward to if not interested)
Not long ago, I decided to build a reasonably good
frequency counter for my personal use and maybe if
the result is simple and elegant, I'll publish th
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