On Wed, Feb 12, 2014 at 11:29 PM, Hal Murray hmur...@megapathdsl.netwrote:
albertson.ch...@gmail.com said:
It might be fun to see what I can do with a cheap $1 10Mhz crystal rather
then using an OCXO.
They make good thermometers. Holdover will be crappy if you can't measure
temperature
[Context is cheap VCXO]
When used inside a GPSDO it only has to hold over for one second until the
next correction.
Only if you have a good antenna and/or antenna location.
I have several low cost GPS units located in far-from-ideal locations. They
work most of the time but often fade out
Lars has done a very good job here and good to see the comments and
excitement.
Have to agree with HAL that holdover is far more than a second and I am in
a good location with the GPS antenna at 90'. I see my 3801 go into holdover
occasionally and its not seconds.
Cheapest tinker 10 Mhz is a Xtal
On Thu, Feb 13, 2014 at 8:36 AM, paul swed paulsw...@gmail.com wrote:
Lars has done a very good job here and good to see the comments and
excitement.
Have to agree with HAL that holdover is far more than a second and I am in
a good location with the GPS antenna at 90'. I see my 3801 go into
You've lost me, what code are you modifying at the moment, is it the
actual Datum demo software?
Regards
Nigel
GM8PZR
In a message dated 12/02/2014 03:48:12 GMT Standard Time, t...@patoka.org
writes:
You are right ! Now I am going to modify the code a lit bit.
Each time as we call
You can buy the chip already on the PCB with supporting circuitry for
less then the price of the chip alone. No need to go with a bare
chip. I think the reason is that the tiny SMT package chips sell in
the millions and only a hob best would use the larger DIP through hole
package. Look at
On Thu, Feb 13, 2014 at 6:36 AM, paul swed paulsw...@gmail.com wrote:
Lars has done a very good job here and good to see the comments and
excitement.
Have to agree with HAL that holdover is far more than a second and I am in
a good location with the GPS antenna at 90'. I see my 3801 go into
Actually, you don't need an Arduino board to use the Arduino IDE to
program an Arduino nor do you you need the USB interface to the Arduino
board to program an Arduino.
For example, you can have a simple Atmega328 circuit with a six or ten
pin in circuit programming connection (ISP) connected
There's an internal comparator interrupt hardware in the Atmel chip the
Arduino uses. It can be programmed using the IDE as well.
Don
Chris Albertson
On Thu, Feb 13, 2014 at 6:36 AM, paul swed paulsw...@gmail.com wrote:
Lars has done a very good job here and good to see the comments and
Graham is correct too. You can do this all with bare chips. But then you
need to build a PCB. Lars used the most number of pre-built parts and was
able to make an entire GPSDO using two external chips and did not have to
fabricate a PCB. I think this is what makes the project so attacive, just
See thats the pointer I need there was just tons of information.
Quite nice and the price is right.
Regards
Paul
On Thu, Feb 13, 2014 at 11:11 AM, Chris Albertson albertson.ch...@gmail.com
wrote:
You can buy the chip already on the PCB with supporting circuitry for
less then the price of the
-- Forwarded message --
From: Chris Albertson albertson.ch...@gmail.com
Date: Thu, Feb 13, 2014 at 8:58 AM
Subject: Re: Atmega?
I posted this off list, but I'm reposting on the list with mnor edits. I
think there might be people looking to buy stuff. If so here are some links
Thanks I did see the post.
But now numbers of opinions are popping up on the thread and that tends to
make things confusing.
Why use the 28 pin chip? My answer is this. Anything I ever do has other
stuff associated with it. So the fact that I can easily solder to the chip
and then add all of the
On Thu, Feb 13, 2014 at 10:40 AM, paul swed paulsw...@gmail.com wrote:
I like the $3.71 ebay board with the atmega chip. But then evidently that
was not the correct chip to do the gpsdo. Darn liked the cost, size, and
form.
You could of ouster use the little $3.71 part. But it would not
I actually think there would be a few changes also as already discussed. I
am not a fan of PWM bits to voltage conversion. High on my list would be a
true 16 or so odd bit DAC and quite reference. But that drives up cost.
Will let the thread run a bit more and see how it all develops.
Regards
FWIW on the topic, since I've been doing some Arduino stuff of late. Bear in
mind like many of you I'm not a software person, so that part doesn't come so
easy to me.
The $3.71 ebay board looks nice, but it's not an official Arduino design, and
may not be well documented. All official Arduino
Paul
I agree with you. I learned from my grandmother we are to poor to buy
junk and she had a lot of money. A LTC 1655 is perfect for the application a
DIP and last ones I bought where in the $ 10 range.
Bert Kehren
In a message dated 2/13/2014 2:04:03 P.M. Eastern Standard Time,
On 2/13/14 10:09 AM, Chris Albertson wrote:
-- Forwarded message --
From: Chris Albertson albertson.ch...@gmail.com
Date: Thu, Feb 13, 2014 at 8:58 AM
Subject: Re: Atmega?
I posted this off list, but I'm reposting on the list with mnor edits. I
think there might be people
I modified two things for now. Its a demo software (Linux edition).
And refclock_banncom driver for NTP. Personally, I would prefer to
modify microcode or library. But that is proprietary with no source code
around.
Regards,
V.P.
On 2014-02-13 10:46, gandal...@aol.com wrote:
You've lost
I have done some calculations on the differential (op amp/comparator) method of
zero crossing detection and it turns out to be very good. Amazingly good.
The delay caused by the RC is roughly equal (actually very close) to the RC
time constant of the RC if the RC 3dB point is 10X or more the
paul:
Analog reference voltage from the uno is available. The adc and dac can
use the same one.
Also, the nano arduinos with mini-usb connectors are pin
(out)-compatible with much smaller footprint. They're load and go with
the same ide. Used lots of them-nice. 16 bit serial dacs are available
Hi
The number of bits and the performance of the ADC’s on the Arduino’s is pretty
underwhelming compared to the stuff on other similarly priced MCU’s. If you are
doing a design where the ADC matters, a PIC or just about anything from TI or
Freescale will do a better job.
Bob
On Feb 13,
On 2/13/14 4:27 PM, Bob Camp wrote:
Hi
The number of bits and the performance of the ADC’s on the Arduino’s is pretty
underwhelming compared to the stuff on other similarly priced MCU’s. If you are
doing a design where the ADC matters, a PIC or just about anything from TI or
Freescale will
Hello Again Time Nuts,
Sorry - first time I went to that site it was 'OK' but then I see it
requires registration - here's the story:
Regards,
John W.
February 13, 2014 7:22 pm
GPS pioneer warns on network's security
By Sam Jones and Carola Hoyos
[image: Europe --- This image is a composite
Thanks, John
It's quite clear that at least one far eastern nation, need I name it?
is going for domination of space, meanwhile feinting with such useless
stuff as old rotted carriers and the like, nothing up my sleeve, trick
the first, meanwhile building its own gps fleet, hardened i'll bet, and
Chris wrote:
Från: Chris Albertson
Skickat: torsdag den 13 februari 2014 07:31
Till: time-nuts@febo.com
1) what connects to analog pins A1, A2, A3, A4, and A5. The schematic
shows only A0 used for the TIC capacitor.
A1 and A2 is connected to temperature sensors like the
26 matches
Mail list logo
