Paul
I agree. That is my main frustration, lot of talk no results. The good
part
of time nuts is that I have made some very good contacts that share my
interest of actually building some things and results are great.
Remember the Loran simulator?
Bert Kehren
In a message dated 12/6/2012 1:17:14 P.M. Eastern Standard Time,
paulsw...@gmail.com writes:
Boy do I have to agree. uProcs by the dozens and with all kinds of
counters
onboard.
I think it was Bob who said none of thats the challenge.
It is the phase comparison method and a stable D/A converter and
reference.
From what I have seen and I could be dead wrong here the on board uprocs
have D/As but the quality is simply OK.
The other comment is that whoever writes the software gets to choose the
software and everything else. Its actually not really democratic at all.
Cause we will all use it if its reasonably good. ;-)
If I do it it will be basic! Though it will run at very high speeds. Now
someone should be jumping in with Forth real soon now.
Last tidbit the Rasberry is a pretty interesting widget and there had
been
a thread about a time server. Was looking forward to the results. Nothing
ever happened.
Regards
Paul
WB8TSL
On Thu, Dec 6, 2012 at 1:00 PM, Bob Camp <li...@rtty.us> wrote:
Hi
It's a rare microcontroller these days that does *not* come with a free
tool
chain. Same goes for the debugger. Most MCU lines have family members
with
similarly low (or lower) prices and good availability. They pretty much
all
either work with a crystal two caps and a resistor. Most will run fine
with
none of the above on the internal clock.
Bob
-----Original Message-----
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Dale J. Robertson
Sent: Thursday, December 06, 2012 12:45 PM
To: time-nuts@febo.com
Subject: Re: [time-nuts] GPSDO Alternatives
Arduino is Dirt Cheap!
At it's cheapest it is just an atmel AVR, a crystal, 2 caps and a
resistor
with the arduino bootloader programmed into it. Easily obtainable from
several sources for 5 bucks or so. All the code, toolchain etc. (the
ecosystem as it were) is free. it's real easy to put one together on a
piece
of perfboard. If you're gonna put the phase detector, dividers etc.
together
anyway there's really no need to clutter things up with some ginormous
commercial arduino board.
Dale
-----Original Message-----
From: Keenan Tims
Sent: Thursday, December 06, 2012 10:38 AM
To: time-nuts@febo.com
Subject: Re: [time-nuts] GPSDO Alternatives
As a lurker, I just want to chime in and say that I for one would love
to see an open-source GPSDO implementation. There are quite a few open
hardware designs out there, but as Bob suggests, all the interesting
bits are tied up in the closed-source software they run. And most of
them are no longer maintained, meaning it's getting hard to find parts.
I've thought on designing a hardware platform to support a GPSDO as
well, but don't have the time-nut or control theory skills (or
equipment) necessary to make the software any good. My hope at the time
was that a build it and they will come approach would solve those
problems, but I haven't had time to make that gamble.
As far as uP choice, Arduino's only saving grace is the pool of existing
'developers' in the amateur community for it - but that's perhaps a big
deal here. It's expensive, doesn't include debug hardware, and is slow
with not many peripherals. I'd second the STM32 ARM Cortex platform, or
suggest MSP430 if you want to stay cheap and slow.
Keenan
VE7XEN
On 2012-12-06 1:28 AM, Chris Albertson wrote:
> On Wed, Dec 5, 2012 at 2:50 PM, <saidj...@aol.com> wrote:
>>
>> If there is one thing I learned, it is that one is never finished
>> improving
>> the software. That is why we are time-nuts I guess.
>>
> This is the reason I suggested using the Arduino. It is so easy to
> program
> that MANY people will be able to contribute. That is my goal, a GPSDO
> that
> can be a "living project" that is not dependent on one or a few
experts.
> I'd like to see a budget of well under $100, again so that more people
can
> contribute and experiment.
>
> A design that can evolve will have just about any performance people
want.
> So don't worry about if it is 1E-12 or 1E-15. Just make it
transparent
> and easy to understand and modify.
>
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