I got twenty 10 MHz rocks from a guy in China a while ago.
It was just a few dollars for 21 pieces. The original purpose
was to build a 10 MHz TRF receiver.
I don't think any of my legacy signal generators are stable enough to
characterize these rocks, but the 5680a should do nicely with a bit
o
On Thu, Dec 29, 2011 at 9:14 PM, John Beale wrote:
> ...and by the way, my FE-5680A shows a consistent -7E-12 per degree C
> temperature sensitivity (measured at case temp 42 and 52 C).
The spec says 3E-10 from -5C to 50C
So (3E-10)/55 = 5.5E-12 and you got 7E-12 I'd say it close to
what's ad
Our battery-inverter systems follow frequency (or more usually the 4
second AGC signal from the ISO) and give or take power at multi-megawatt
levels to stabilize frequency changes.
This is the first I've seen a map of the entire CONUS though,
interesting stuff!
Peter
On 12/29/2011 9:20 PM,
In case it's useful... there are many ways to get a square wave out from a
sine wave in, but one straightforward way is with a comparator. Some work
better than others. The slow ones won't work at all at 10 MHz, and the very
fast comparators (MAX999, ADCMP600, LT1116 etc.) are more expensive, an
Just FYI, this current batch of FE-5680As has a different RF
architecture than the old ones - one of the most notable changes is
that although they still have a DDS in them it's not in the output
path anymore - the VCXO now runs at 60MHz, and this is divided down
(in a CPLD) to produce the 10MHz ou
Yes that is correct. I have one of the units made by James Miller G3RUH. I
had hoped to build some something along these lines on my own, but the Jupiter
gps modules I acquired didn't actually have a 10 kHz output. Also my comment
re the adev is for the 10 MHz output. I've never looked a
I think you are talking about the G3RUH/N1JEZ design. I have built three of
them
and they work very well.
73 es HNY, Dick, W1KSZ
-Original Message-
>From: Mark Spencer
>Sent: Dec 29, 2011 9:24 PM
>To: Discussion of precise time and frequency measurement
>Subject: Re: [time-nuts] Thu
One of the designs using the 10 kHz output from a Jupiter gps engine and a
simple PLL to discipline an ocxo might be good starting point if suitable gps
engines are still available. There won't be much to tweak but the performance
could be quite good.
My first gpsdo was a manufactured version
> The era of cheap Thunderbolts appears to be history.
>
What is the simplest GPSDO you can build? There are many designs
around but when the T-Bolts came out I think people lost interesting
building.
I think something very simple could work. If your local oscillator is
at all decent it will n
On 12/29/11 6:16 PM, gary wrote:
http://fnetpublic.utk.edu/gradientmap.html
I'm not sure if it's live data or a playback of recorded data, by the way
So is Texas on it's own grid, or are they always out of sync with the
rest of the nation. ;-)
Both.
Any idea about the white streak leavi
http://fnetpublic.utk.edu/gradientmap.html
So is Texas on it's own grid, or are they always out of sync with the
rest of the nation. ;-)
Any idea about the white streak leaving what looks like the Sacramento
delta towards Vegas?
On 12/29/2011 4:16 PM, Jim Lux wrote:
Check it out:
http:
Tried crystal lattice filters, their bw is usually too large (1 to 2khz)
I would use a simple pll, such as an exor gate driving a single gate vcxo with
<10hz bw. Most crystal oscillators would improve the noise from the dds.
So you could do this with four parts:
Nc7sz86 exor gate driven by the
Check it out:
http://fnetpublic.utk.edu/tabledisplay.html
line frequency measurements updated once a second
Operated by the Power Information Technology Laboratory at the
University of Tennessee, FNET is a low-cost, quickly deployable
GPS-synchronized wide-area frequency measurement network.
On Thu, Dec 29, 2011 at 10:37 AM, Said Jackson wrote:
> Good enough as a portable frequency counter reference, as the offset can be
> compensated, and the output is fairly stable...
>
> These units could really use gps disciplining and a crystal post filter.
>
> Great stuff for $40, new they mus
Eric,
If you go for the 100, I'll take 10.
Joe
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Eric Garner
Sent: Thursday, December 29, 2011 12:00 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Sub
Hello Eric.
I have three 74ACT175 if that can be usefull.
If you want them, just email me your postal address off-list, you will
only have to paypal me the shipping charge.
Claude
I located a supply of 74AC175PC for $2 USD at qty 100. I still need 2 of
them to finish off all of my PICTIC II'
If you don't get enough interest I can send you a few.
Stanley
- Original Message -
From: "Eric Garner"
To: "Discussion of precise time and frequency measurement"
Sent: Thursday, December 29, 2011 12:00 PM
Subject: Re: [time-nuts] Subs for obsolete chips in pictic
I located a supp
I made an offer on another so I will have multiple units. When one dies
I will make a schematic (or if someone has a fried one and sends it to me).
On 12/29/2011 8:29 AM, Bill riches wrote:
look on this list about a week ago. i wrote up how I did it. very easy. my
unit is holding at a few
I gave my 5680a several firm whacks with a backscratcher and it did not
seem to flinch.
On the other hand I've used taps with a jeweler's screwdriver to fine
tune my counter's timebase.
On 12/29/2011 10:37 AM, Said Jackson wrote:
Hello Mike,
We measured a couple of these 5680As on a tsc5125a
Hello Mike,
We measured a couple of these 5680As on a tsc5125a analyzer. With different
quality supplies.
Very noisy buggers, huge number of spurs and very high noise floor -130dBc or
so if I recall correctly. Thats probably the jitter you are seeing. Probably
due to the dds generating the out
I located a supply of 74AC175PC for $2 USD at qty 100. I still need 2 of
them to finish off all of my PICTIC II's (I have 3 completed). Are there
still some available from people willing to part with some? or is there
enough interest in that I could distribute enough of them to list members
at cos
On Wed, Dec 28, 2011 at 11:14 PM, mike cook wrote:
>
> 1) What is the expected 10MHz peak to peak voltage. FEI doc seems to
> indicate 0,5V but I am getting only 200mv.
> 2) What is the sensitivity to 15V input level. I am only measuring 14,722
> (stable) on Pin1.
> 3) Could this low input volta
look on this list about a week ago. i wrote up how I did it. very easy. my
unit is holding at a few parts to the -11. sorry i do not have file on ipad.
bill wa2dvu
Sent from my iPad
On Dec 29, 2011, at 6:42 AM, Azelio Boriani wrote:
> Someone here has pointed out how to connect to the C-
Someone here has pointed out how to connect to the C-field control... I
can't remember when, must serach the archive. It wasn't long ago because
all the FE5680 stuff is very recent. I don't think that a schematic of the
FEI Rbs will be ever available officially.
On Thu, Dec 29, 2011 at 10:20 AM, C
I'm afraid I wasn't clear. I need a schematic for the FE-5680A
so I can add an analog freq control to it.
On 12/29/2011 12:59 AM, Azelio Boriani wrote:
For some notes on how to connect an external oscillator to the TBolt see:
http://www.thegleam.com/ke5fx/tbolt.htm
On Thu, Dec 29, 2011 at 2:
For some notes on how to connect an external oscillator to the TBolt see:
http://www.thegleam.com/ke5fx/tbolt.htm
On Thu, Dec 29, 2011 at 2:15 AM, Chuck Forsberg WA7KGX N2469R
wrote:
> Is there a schematic available?
>
> I have a Tbolt that came with a failed oscillator that might
> enjoy whipp
Le 29/12/2011 09:28, Chris Albertson a écrit :
1) What is the expected 10MHz peak to peak voltage. FEI doc seems to
indicate 0,5V but I am getting only 200mv.
I'm getting a lot more, about 2V peak to peak. What are you loading it
with, I'm using a 10X scope probe. How are you measuring the
Artifacts from the TDS210, not from the Rb.
On Thu, Dec 29, 2011 at 8:14 AM, mike cook wrote:
> Hi,
> Just got my cheapo 5680A. It was accompanied by a little teddy bear
> clutching a L7805CV !
>
> Got a couple of questions.
>
> 1) What is the expected 10MHz peak to peak voltage. FEI doc seems
On Wed, Dec 28, 2011 at 11:14 PM, mike cook wrote:
> Hi,
> Just got my cheapo 5680A. It was accompanied by a little teddy bear
> clutching a L7805CV !
>
> Got a couple of questions.
>
> 1) What is the expected 10MHz peak to peak voltage. FEI doc seems to
> indicate 0,5V but I am getting only 20
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