One way to find out if people are interested enough to pledge some money
up front is something like this project
http://www.kickstarter.com/projects/bushing/openvizsla-open-source-usb-protocol-analyzer
Alan
On 12/16/2010 12:55 PM, Bob Camp wrote:
Hi
If you look in detail at the ups and downs of the TAPR SDR project, it's not
one I would want to emulate.
If we have a few hundred people interested with cash in hand, this might
indeed make sense.
Bob
-----Original Message-----
From: [email protected] [mailto:[email protected]] On
Behalf Of Chris Albertson
Sent: Thursday, December 16, 2010 3:36 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Frequency counter recommendation
Here is an example of doing something like this as a open source
design by a group of HAMs
http://www.tapr.org/kits_janus.html
This is a software defined radio but is close to the complexity we are
talking about here. It has a d/a converter and fpga and lots of
surface mount parts. TAPR is able to have these made and sell them
for $180.
While this is a proof by example that such a project can be done I'd
not go this route. Better I think to design a modular system where
the modules have easy and well defined interfaces and where each can
have whatever quality specs are desired. There is a danger with
these group project that you run into a requirements "race" to the top
and end up with a hard to manufacture and maintain part. I think the
HPSDR project did this
On Thu, Dec 16, 2010 at 11:20 AM, Bob Camp<[email protected]> wrote:
Hi
Yes indeed, been there done that. Not very hard at all.
All you need is the six layer pc board (can be bought), the FPGA (Digikey
has them), a few of these and a couple of those. Spend less than $100 and
you are in business if the PC board volume is high enough.
In this case the next step in the business is to solder the 256 ball 1 mm
spacing BGA package down on the pc board. Not so easy without the right
tools...
Bob
-----Original Message-----
From: [email protected] [mailto:[email protected]] On
Behalf Of Don Latham
Sent: Wednesday, December 15, 2010 3:48 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Frequency counter recommendation
OK, time-nuts, here's the gauntlet. can't "we" generate a design for a
PC-based FPGA or chip setup that would be generally useful as a counter?
We've seen thorough discussions about trigger jitter, which IMHO is the
fundamental problem. And isn't the PIC2 Time base from 10 MHz standard,
all else should be straightforward.
I'm not a designer, just a messer-arounder, or I'd give it a shot. Robot
Basic is a nice PC software maybe.
Don
J. L. Trantham, M. D.
I suspect that this question will lead to a discussion of Dual Mixers but
as
far as the counter question goes, I would recommend you consider an HP
5370B.
Joe
-----Original Message-----
From: [email protected] [mailto:[email protected]]on
Behalf Of Dave M
Sent: Wednesday, December 15, 2010 1:55 PM
To: TimeNuts
Subject: [time-nuts] Frequency counter recommendation
I'm a retired electronics tech and computer programmer. I have a pretty
decently equipped shop for almost all of my projects and experiments.
However, my time and frequency equipment is a bit long in the tooth. I
have
a couple old HP 5328A counters (commercial version; not the military
version), one with a 10544, the other with a 10811 oscillator.
I have an HP Z3801A that has been operating well for several years, and
recently acquired a TBolt to keep the counters in tune. I also have a
good
distribution amp and couple of old Montronics (Fluke) frequency
comparators.
What I'm looking for now, is a recommendation for a good low-cost (<$400)
counter that will get me on the way to performing some of the "down in
the
grass" noise, jitter and deviation tests that the more learned members of
the group discuss. I know that new equipment is far out of my budget,
but
I'm also aware that some of the older, now obsolete (also cheaper)
equipment
is quite capable of doing what I want to do. I prefer HP equipment since
manuals are much easier to find than most other brands.
I'd also like recommendation for a good low-cost GPIB controller that
allows
me to write software to control some of my instruments. I have
experience
writing software in BASIC on a Fluke 1722A controller. I've seen these
controllers on the Bay and other online vendors, but I've not located the
BASIC discs for them. Any advice?
I realize that a counter is not the only piece that I need, but it's
first
on my list. Other, more applicable equipment is on my want list, but
will
have to wait for a bit.
Thanks for advice,
David
dgminala at mediacombb dot net
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--
"Neither the voice of authority nor the weight of reason and argument are
as significant as experiment, for thence comes quiet to the mind."
R. Bacon
"If you don't know what it is, don't poke it."
Ghost in the Shell
Dr. Don Latham AJ7LL
Six Mile Systems LLP
17850 Six Mile Road
POB 134
Huson, MT, 59846
VOX 406-626-4304
www.lightningforensics.com
www.sixmilesystems.com
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