[time-nuts] Nifty "MINI TIC" for DMTD work detail Info please read
EWKehren at aol.com
EWKehren at aol.com
Tue Nov 20 12:20:48 UTC 2012
Dave
Thank you for your offer. I think I have the documentation solved. Brian,
who helped in the past has offered to help and has some of the previous work
to build on.
As to PIC programming I will ask Juerg to get with you off list.
Bert
In a message dated 11/19/2012 8:47:25 P.M. Eastern Standard Time,
mcquate at sonic.net writes:
Hi Bert,
What kind or sort of documentation is needed?
schematics?
PC layout?
software / firmware documentation?
I've been programming PICs intermittently for 10+ years. Some of my
projects use 2 or 4 line LCD displays. I have given other
microcontrollers a short test spin.
I've also done some Verilog with the Altera DE0 nano board (Cyclone IV
EP4CE22F17), a period counter that used an internal PLL to boost the
hardware 50 MHz to 300 MHz for better resolution. Also FPGA for software
defined radio signal processing (Cyclone III).
Dave McQuate
WA8YWQ
mcquate at sonic.net
On 11/19/2012 2:28 PM, EWKehren at aol.com wrote:
>
> Allow me to put all this in perspective. Three years ago having just
> joined time-nuts I started to be interested in Dual Mixers. Having CS
and Rb my
> main interest was and still is low noise signal generators and I have
all
> the HP equipment for those measurements. Did my first Shera Rb about
2000
> and a few more since. Time was not and still is not much of an interest
my
> best time instrument is a modified PICTIC II.
> Starting with the original NBS paper I came to the conclusion that the
> major cost would be the counter, something I would have very little use
for,
> for other projects since I am well equipped up to 40 GHz. That is when I
> came up with the idea of what I call a ping pong counter a counter that
counts
> every period, sort of pseudo time stamping. Back of an envelop
calculation
> and I went on the list stating that I think a $ 200 D/M system not
> counting OCXO’s was doable. What was needed was help with the PIC
codes. First
> response was “that is why we call our self Time-nuts”. However Richard
Mc
> Cokle did offer his help and he has been key to the success. The goal
of $
> 200 for all material for a 4 channel counter and D/M is attainable if
10
> boards are ordered.
> The first set of boards where done in about 5 month. Several people
tested
> the D/M but kept on using their counter and my thanks go out to Corby
who
> tested the very first D/M.
> I was left testing the counter and logic is my strong suit as Juerg will
> attest my weakness is software even though at one time I set up and was
in
> charge of a software group. Had problems with the counter PC interface.
Now
> thanks to Corby I now know that the problem was the 56K RS 232 versus
9.6
> K. Tells you how brilliant I am on that subject. Till recently I
thought RS
> 232 is RS232.
> I did reach out to the list and connected with Fred Tijddingen who
offered
> to help. I send him a counter and he asked me to get him some parts that
> where not time related after he agreed to pay for them. After I shipped
> them, never heard from him again. Be careful, I do not know if any one
else had
> that experience. Many of you know I used to ship and only asked to be
paid
> after you got the parts. Well now I am a lot more selective.
> A year ago I connected with list member Juerg Koegel. We share the same
> priorities and complement each other with our skill sets. On top of that
> Juerg has the equipment that I lack and the know how to make it talk to
PC’s.
> On top of that Juerg had used a MAX 3000 G/A for a PICTIC counter.
Perfect
> match. Juerg can also write PIC code, not like Richard but what we
need.
> First out the 2 channel and 4 channel counters now with G/A’s and
Richards
> PIC;s. The two channel measures phase and period in the ping pong mode
> allowing you to do the basics of a single D/M. The 4 channel was
intended for
> two D/M’s or with an additional 2 channel for three corner hat. Can
also be
> used for cross correlation.
> How ever the 4 channel in combination with one D/M allows also very high
> resolution frequency comparison only limited by the noise floor of the
D/M.
> Since the A/V measurements are most likely not a daily activity using
this
> instrument for frequency measurements or aging tests over long term
makes
> it a very useful tool. Juerg does not want me to talk to much about it,
but
> he is right now busy writing PIC code for a 4 line LCD display that also
> includes a Vinculum VDRIVE2 that allows recording data on a USB flash
drive,
> interfaces with a PC using RS 232, USB and Bluetooth. I call it the
Swiss
> Army Knife, because of all the things the combination D/M, Counter and
Juerg
> LCD can do.
> The D/M is being revisited because of the counter performance. 1 E-13 is
> easily attainable but the Czech IREE published a paper and claim 2 E-15.
> Would be nice to get 1 E-14. Tried to get detailed information, no
luck, but
> maybe some list member will be able to. It was EU funded.
> Working with Juerg has been very productive
> 2 channel counter done
> 4 channel counter done
> Partridge and TADD-2 Mini like 1 pps generator using G/A done
> Tbolt Bluetooth interface done
> G/A version of Shera using 100 or 200 MHz in testing
> D/M LCD PCB done, in code writing phase
> Austron circuit using G/A in testing
> PICTIC II using G/A in board layout G/A done
> At this point I like to make a plug for the Altera MAX 3000 GA. Easy to
> program (I can do it) low cost and makes all TTL and HC logic available
but
> the best part if something does not work you do not have to do a new
board,
> just reprogram. Using a $ 0.60 socket makes it very solderable. Made a
> prototype board and I think it is fair to say that our productivity has
gone up
> 10 fold. Some one mentioned G/A jitter a day later we had a test setup
> comparing a Partrige board with our circuit and found out thanks to Jueg
’s
> equipment G/A was as good maybe slightly better. Software is free and
the prog
> rammer is $ 10.
> What happens next depends on interest by the list. Juerg and I will not
> get in to the kit business but if larger interest is there I will find
a way
> to accommodate.
> Let me make it clear, the counter by it self has only limited
usability,
> you also have to have or build a D/M. But the combination with a PC or
> Display will make it a very useful, flexible, affordable tool.
> My back of the envelope calculation still shows $ 200 for the Mixer und
> counter and somewhere between $ 350 and 400 for a full up system using
Morion
> MV 89 OCXO for offset, LCD Display with VDRIVE2, power supplies and
> enclosure.
> I am looking for a volotier to work with me on the documentation, my
> drafting skills are mnimal and I want Juerg to focus on display code.
Would be a
> distraction.
> Will send a picture of the 2 channel but have to compress to make it
> through the system.
> Bert Kehren Miami
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