On 1/14/12 9:18 PM, Chris Albertson wrote:
Not over kill at all. It is worth paying a few $$ not to have to
design a PCB. Worse then that is that most will take shortcuts and
design it so that you need a sppepcial IC programmer to program the
PIC. Thee $20 development boards allow you to
On Sun, 15 Jan 2012 16:45:56 +0100
Magnus Danielson mag...@rubidium.dyndns.org wrote:
A short notice on embedded CPU/MPUs into FPGAs. Using PIC or AVR might
be tempting, but I consider any clone dirty from a rights perspective,
MIPS for instance have been very protective on their side, so
On Sun, 15 Jan 2012 11:27:27 -0500
paul swed paulsw...@gmail.com wrote:
FPGAs are generally intended for the mass market with a steep learning
curve. Though they can be pressed into whats of interest to time-nuts it
simply seems like a overly complicated technology and method for a non-mass
Hi
The lock range of the 5680 is limited only by the range of the VCXO. The DDS
has way more range than the VCXO does and there's nothing else in that loop.
The rubidium cell does not change frequency when the DDS is tuned, so that
entire loop is not a limiting factor. As you approach the edge
On 1/16/12 2:44 AM, Attila Kinali wrote:
On Sun, 15 Jan 2012 11:27:27 -0500
paul swedpaulsw...@gmail.com wrote:
FPGAs are generally intended for the mass market with a steep learning
curve. Though they can be pressed into whats of interest to time-nuts it
simply seems like a overly
On Mon, Jan 16, 2012 at 2:44 AM, Attila Kinali att...@kinali.ch wrote:
But yes, you are right. An FPGA is probably not the right thing. Not because
it is more difficult, but rather because there are less tools and less
documentation available. Hence making it more difficult for the hobbyist
On 01/16/2012 11:31 AM, Attila Kinali wrote:
On Sun, 15 Jan 2012 16:45:56 +0100
Magnus Danielsonmag...@rubidium.dyndns.org wrote:
A short notice on embedded CPU/MPUs into FPGAs. Using PIC or AVR might
be tempting, but I consider any clone dirty from a rights perspective,
MIPS for instance
Hi
Don't forget to toss RAM, Flash, EEPROM, brown out detection, and a clock
oscillator on your board. You get all that stuff built in on a sub $5 / 100 Mhz
micro, but not on a FPGA. I'm not saying you can't take care of all that on a
board, just that you need to plan ahead.
Bob
On Jan 16,
I am staying out of that discussion due to lack of knowledge, My question
is wether the input circuit is acceptable or if some one has a different
solution. We have integrated the Shera input including the interrupt counter
on the chip, so there are only three interface pins, interrupt,
On 01/15/2012 05:48 AM, Chris Albertson wrote:
On Sat, Jan 14, 2012 at 4:32 AM,ewkeh...@aol.com wrote:
I have no expertise when it comes to filter design or programming PIC's or
other micro controllers. But I know what works for me. For 11 years I have
been using Shera controllers with very
Magnus I agree,
I can not se how any one can simplify this approach. A $2 gate array in a
0.5 $ socket that is solderable, a $ 2 14 pin DIP uP what ever brand, a
clock generator, a RS232 interface, a 3.3 V regulator and two single gate 14's
what more do you want. If communication is
I have been watching for a bit now. Its more interesting now that my
FE5680s working quite well. I have noticed on numbers of threads the
conversation dramatically shifts from reasonably implemented low cost
solutions to the ultimate FPGA.
FPGAs are generally intended for the mass market with a
Thank you Paul.
By the way the GA programmer cost $ 10 and the software is free and
relatively easy to use. Has most TTL functions in its library!
Bert Kehren
In a message dated 1/15/2012 11:27:50 A.M. Eastern Standard Time,
paulsw...@gmail.com writes:
I have been watching for a bit now.
I recommend bluetooth
Bert Kehren
In a message dated 1/15/2012 1:32:37 P.M. Eastern Standard Time,
hmur...@megapathdsl.net writes:
albertson.ch...@gmail.com said:
So I want to be able to connect a desktop computer and a USB cable is to
short.
You can get USB cable extenders. They are
On Sun, 15 Jan 2012 16:45:56 +0100, Magnus Danielson wrote:
I could also roll my own CPU, as I have already done before, but
building a tool-chain including GCC is a bit of home-work. For my
application I haven't bothered, but it is tempting to get C
capabilities.
How about the new Zylin
I would just use a PIC, AVR, or ARM even if I had to use more than one
with some discrete logic on the side but I like solder, assembly, and
low level coding in that order. If I find a small, cheap, easy to
use, and general purpose FPGA, I may look into that as well.
MIPS may be a special case
One 14 pin uP along with a MAX3000A will do it hands down.
Bert
In a message dated 1/15/2012 2:43:54 P.M. Eastern Standard Time,
davidwh...@gmail.com writes:
I would just use a PIC, AVR, or ARM even if I had to use more than one
with some discrete logic on the side but I like solder,
The MAX3000A and the PIC can be bought any place in the EU.
Bert Kehren
In a message dated 1/15/2012 2:09:24 P.M. Eastern Standard Time,
xne...@luna.kyed.com writes:
On Sun, 15 Jan 2012 16:45:56 +0100, Magnus Danielson wrote:
I could also roll my own CPU, as I have already done before,
We are talking about a controller for the new batch of $38 FE5680
units right? Unless you modify these the frequency must be
controlled by RS232.
Then you said FPGA right?If so why worry about the bits in the
counter. You can change it later with a few minutes effort. If you
have 250,000
On Sun, Jan 15, 2012 at 10:32 AM, Hal Murray hmur...@megapathdsl.net wrote:
You can get USB cable extenders. They are 15 feet long with a hub built into
the connector blob at the far end. There is a limit of 4 or 5. They
obviously reduce the power available to the end device.
--
May have
On Sun, Jan 15, 2012 at 7:45 AM, Magnus Danielson
mag...@rubidium.dyndns.org wrote:
A short notice on embedded CPU/MPUs into FPGAs. Using PIC or AVR might be
tempting, but I consider any clone dirty from a rights perspective, MIPS
for instance have been very protective on their side, so has
Why do it easy when you can do it difficult. With my Lab setup the
frequency out of the Tbolt changes once in a while to correct the 1 PPS. That
is
how I explain what I se on my Tracor 527E. Maybe I am wrong.
Bert
In a message dated 1/15/2012 5:12:18 P.M. Eastern Standard Time,
Hi Chris,
One other front end change. I few people have Thunderbolts and it
would be faster to lock the FE5680 to the 10MHz signal then to the
PPS.
Or remove the OCXO from the Thunderbolt and feed the GPS receiver with the
FE5680 10MHz. Either modify the FE5680 for EFC och program a uC to
On 01/15/2012 11:34 PM, Chris Albertson wrote:
On Sun, Jan 15, 2012 at 7:45 AM, Magnus Danielson
mag...@rubidium.dyndns.org wrote:
A short notice on embedded CPU/MPUs into FPGAs. Using PIC or AVR might be
tempting, but I consider any clone dirty from a rights perspective, MIPS
for instance
On 01/16/2012 12:04 AM, b...@lysator.liu.se wrote:
Hi Chris,
One other front end change. I few people have Thunderbolts and it
would be faster to lock the FE5680 to the 10MHz signal then to the
PPS.
Or remove the OCXO from the Thunderbolt and feed the GPS receiver with the
FE5680 10MHz.
I have no expertise when it comes to filter design or programming PIC's or
other micro controllers. But I know what works for me. For 11 years I have
been using Shera controllers with very good results. (I still have some new
assembled extra AA boards, if any one is interested, please
On Sat, 14 Jan 2012 07:32:15 -0500, EWKehren-YDxpq3io04c wrote:
I hope this answers a lot of questions. What is needed is that some one
steps up to the plate and does the controller. To me the appeal is the
$15 solution.
Bert Kehren
This might be a serious overkill
But it has built in
That is a serious little processor for that kind of money.
On 1/14/2012 4:26 PM, cfo wrote:
On Sat, 14 Jan 2012 07:32:15 -0500, EWKehren-YDxpq3io04c wrote:
I hope this answers a lot of questions. What is needed is that some one
steps up to the plate and does the controller. To me the appeal
On 01/14/2012 01:32 PM, ewkeh...@aol.com wrote:
I have no expertise when it comes to filter design or programming PIC's or
other micro controllers. But I know what works for me. For 11 years I have
been using Shera controllers with very good results. (I still have some new
assembled extra AA
On Sat, Jan 14, 2012 at 4:32 AM, ewkeh...@aol.com wrote:
I have no expertise when it comes to filter design or programming PIC's or
other micro controllers. But I know what works for me. For 11 years I have
been using Shera controllers with very good results. (I still have some new
assembled
On Sat, Jan 14, 2012 at 1:26 PM, cfo xne...@luna.kyed.com wrote:
On Sat, 14 Jan 2012 07:32:15 -0500, EWKehren-YDxpq3io04c wrote:
I hope this answers a lot of questions. What is needed is that some one
steps up to the plate and does the controller. To me the appeal is the
$15 solution.
I'm
Not over kill at all. It is worth paying a few $$ not to have to
design a PCB. Worse then that is that most will take shortcuts and
design it so that you need a sppepcial IC programmer to program the
PIC. Thee $20 development boards allow you to download the firmware
over USB so users can do
32 matches
Mail list logo
