On Sun, Jul 9, 2017 at 2:15 AM, Mark Sims wrote:
>
> So far my design is tending towards: 10MHz ref input -> Minicircuits doubler
> -> Wenzel squarer -> 74AC74 divider -> 74AC04 buffer -> level shifter. The
> doubler/divider might not be needed, but I think it will give a more
> symmetric o
On Fri, Jan 20, 2017 at 4:52 AM, Richard (Rick) Karlquist
wrote:
> Off topic, but probably a lot of disgrunted Eagle users on this list.
> Its official, you will now have to pay $500 per year for a
> professional license from Autodesk. The spin meistering of the
> announcement would make George O
1818-2295A dump has been uploaded to ko4bb site, probably there's need
to be moved in the right place before it's available.
On Mon, Oct 10, 2016 at 9:32 AM, Francesco Messineo
wrote:
> Hi Dave,
> right, once I find the dumps, I'll upload them.
> thanks
> Frank IZ8DWF
and 53 states, and with logic analyzer
> watching the EEPROM it should be possible to follow along. It is a nice
> little computer with constant time instructions, 64 bits of RAM. Each
> instruction contains a conditional qualifier along with the next address,
> very 1960s.
&g
Hi Dave,
right, once I find the dumps, I'll upload them.
thanks
Frank IZ8DWF
On Mon, Oct 10, 2016 at 9:24 AM, Artek Manuals wrote:
> Frank
>
> One of the best places to store ROM dumps for easy access by everyon is
> KO4BB.com
>
> Dave
> NR1DX
> dit dit
>
&g
I have a dump of the 1818-2295A somewhere, it should be archived in
one of my backups. I also made a replacement with a board having 2 x
28C64 SO-28 eeproms and it worked in my 59309A as far as I could test
it. However these eeproms present many glitches on the outputs during
address toggling, so i
Same here,
shipping costs to Italy were quoted at $65, no joy.
I'll try to make some US friend buy one and re-send with cheaper
method, if possible.
On Fri, Oct 2, 2015 at 7:36 PM, Roy Phillips wrote:
> For we Europeans, British in my case, the Symmetricom GPS antennas are very
> good buy – but
On Thu, Apr 23, 2015 at 9:13 PM, Charles Steinmetz
wrote:
> Magnus wrote:
>
>> Would be fun to have a GPIB interface in the HP5328A
>
>
> ??? I have 6 or 7 of these, and they all have HPIB interfaces. It was
> option 011 for the 5328A. I believe all 5328Bs had HPIB as standard. Here
> is a lin
On Sun, Feb 15, 2015 at 10:34 PM, Hal Murray wrote:
>
> francesco.messi...@gmail.com said:
>> I measured the PPS output with an HP-5328B, PPS of the thunderbolt as start,
>> rising edge, rockwell PPS as stop, rising edge. The delay is 406.3 ms +/- 30
>> uS.
>
>> Are those numbers normal for a rock
Hi all,
I'm testing a custom (and unknown to me) GPS board I had for free some
years ago. It has a 10 KHz output and 1 PPS output.
Using a thunderbolt as reference, 10 KHz output is abut 13 mHz higher
(10 MHz output of the thunderbolt is the time base of the counter,
HP-5386A).
I measured the PPS
I reply to myself,
On Mon, Dec 15, 2014 at 2:41 PM, Francesco Messineo
wrote:
>
>
> I've found a couple of articles saying the A1025 indeed has PPS output
> as I suspected. However, none of them reports any hint about the
> pinout of this module.
> The module itself
On Mon, Dec 15, 2014 at 9:09 AM, Brian Inglis
wrote:
> On 2014-12-14 10:29, Francesco Messineo wrote:
>
>> The A1029, which is a newer model, has indeed a PPS output and I've
>> been able to find a datasheet for it but the pinout isn't anything
>> like the A1025
On Sun, Dec 14, 2014 at 6:12 PM, Bob Camp wrote:
>>>
>>> It’s unlikely that a consumer targeted GPS has a good dedicated PPS out of
>>> it. Finding one that will do position hold is even less likely. You can get
>>> modules that will do both for < $20 and have a documented interface.
>>
>> that
On Sun, Dec 14, 2014 at 3:46 PM, Bob Camp wrote:
>
> Hi
>
> > On Dec 14, 2014, at 6:03 AM, Francesco Messineo
> > wrote:
> >
> > Hi all,
> > I've just found an old anti-theft system (I think) for cars . It has a tyco
> > electronics A1205 gps mo
Hi all,
I've just found an old anti-theft system (I think) for cars . It has a tyco
electronics A1205 gps module.
I've been unable to find any information about this module, other than it
should be a 3.3V 12 channel GPS module with serial NMEA output.
Does anyone have any informations about it? Eve
Sorry if I hijack the thread...
On Sat, Nov 8, 2014 at 5:20 AM, Said Jackson via time-nuts
wrote:
> Joe,
>
> This puppy can go to 166MHz over temp and has standard 100 mil pin spacing if
> you put it into a socket: ATF16V8C
>
> I have not used PALs since 1992 but I used to be extremely fond of t
On Sun, Sep 28, 2014 at 6:35 PM, Didier Juges wrote:
> Thank you for your patience and your support.
thank to you for your service!
I'm a *nix system administrator since 20 years (well, my job would
turn 20 next year actually). So if you ever need any support, just
ask.
Frank
__
Hi all,
what would be the best method to try injection locking a butler common
base crystal oscillator (see figure in
http://www.eska.dk/oscillator_data.htm for schematic)?
Any comment about close-in phase noise performance when adding
injection locking to such oscillators?
Thanks in advance for a
On Sun, May 4, 2014 at 5:40 PM, Chris Albertson
wrote:
> Looks like this is all you'd need for most timing projects. Just add your
> favorite OCXO and some wire.
>
> The SPARC (not Spark) is actually a step up from ARM. It was developed by
> Sun Microsystems (now Oracle) it is optimized for thin
On Wed, Apr 9, 2014 at 8:58 AM, David McQuate wrote:
> The output looks differentiated, as would happen if the wire connecting the
> internal circuit to the output pin became open, leaving only a very small
> capacitance to couple the square wave out.
I agree, I had a similar problem on an oscill
Hello all,
does anyone know what's the OCXO (or else) in this picture?
http://www.electronicsurplus.it/open2b/var/catalog/images/1354/0-c26b2bc0-800.jpg
I'm trying to understand if it's something worth buying, but I can't
find any information on the site other than 5 MHz oven quartz
oscillator (
On Mon, Sep 2, 2013 at 12:23 AM, Paul Alfille wrote:
> I want to report that tboltmon works well on linux under Wine.
>
> I'm running fedora 19, 64-bit (so the executable is wine64) and tboltmon
> version 2.6
>
> Getting a com port pointing to a USB serial adapter is it's own project, but
> quite
Hi all,
has anyone tried to duplicate the following project:
http://www.marvellconsultants.com/DCF
Any comment?
Best regards
Frank
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/ti
On Tue, Jul 31, 2012 at 1:50 AM, Chuck Harris wrote:
> Chris Albertson wrote:
> ... I wonder how many
>
> Or maybe more to the point, I wonder how many of us have installed
> 10base5 cable, and done vampire taps? I think I still have one of
> the tools around here somewhere... probably with my
On 5/1/12, saidj...@aol.com wrote:
> Incorrect, the UTC offset should be sent in the Almanac, the Almanac
> having a period of 12.5 minutes max. Not one hour. It should take no more
> than
> 12.5 minutes to get the UTC offset when sats are properly being received.
when I posted my original enqui
Hi Hal,
On 5/1/12, Hal Murray wrote:
>
> francesco.messi...@gmail.com said:
>> I just powered on again my trimble thunderbolt after some time without
>> antenna. All alarms are green but the obvious leap second pending. BUT: I
>> can't use UTC time as both tboltmon and lady heather display a "No
Hi all,
I just powered on again my trimble thunderbolt after some time without antenna.
All alarms are green but the obvious leap second pending. BUT: I can't
use UTC time as both tboltmon and lady heather display a "No UTC
offset" message. I don't remember having seen this in the past. What's
wro
Hi all,
seeing this spec sheet:
http://www.saderet.co.uk/Admin/Datasheet/New%20antenna_spec.pdf
I was wondering why these antennas have so different GPS bandwidth.
Does the BW affect performance of a trimble thunderbolt for example?
Thanks in advance
Frank IZ8DWF
___
Hi Alberto,
On Fri, May 27, 2011 at 8:45 PM, Alberto di Bene wrote:
> I left my Thunderbolt running with Lady Heather started. Returning after a
> few hours in the room,
> which is at a constant temperature (underground, no heating, no air
> conditioning), I found the
> following plot on the Lady
On Fri, May 27, 2011 at 6:10 PM, Mark Spencer wrote:
> Imho phase noise is probably as important as long term stability in this
> application.
for real and serious amateur radio dxing it's much more important the
phase noise and IMD3 performance of the RX rather than stability. Not
that stabili
Hello,
On Thu, Dec 9, 2010 at 5:13 AM, Michael Poulos wrote:
> Recently I bought a Efratom Ru frequency standard from eBay and a frequency
> divider chip that makes 1MHZ,100KHZ,25KHZ,10KHZ,100HZ and a 1HZ output.
> Today I thought of a way to make a nice 60HZ so you can use a mains-powered
> cloc
The answer is much simpler: the object's wave function (quantum
mechanics) can move the object, albeit with little probability :-)
Best regards
Frank
On Fri, Nov 12, 2010 at 3:18 PM, Steve Rooke wrote:
> I liked the idea of fairies being the culprits but each to their own :)
>
> I think that th
Hello,
On Mon, Sep 20, 2010 at 12:21 PM, wrote:
> Between Tboltmon and Ladyheather, you'll see that your unit either works or
> it doesn't. My bet is that it will work just fine, even if the antenna is
> indoors- and then you won't be able to stop watching it (esp. with lady
> heather) for at
ine. The more education I
>> received the greater my expectations became, however, it did not need to
>> over complicate matters. 73 - Mike
>>
>> Mike B. Feher, N4FS
>> 89 Arnold Blvd.
>> Howell, NJ, 07731
>> 732-886-5960
>>
>>
>>
>>
Hi Mike,
On 9/19/10, Mike Feher wrote:
> Frank -
>
> Great idea, so obvious I did not think of it. If you mix the 20 and 22 you
> will only get 3 dB degradation or still very close to the -131 dBc/Hz
> relative to the 10811A. As I mentioned before the architecture is relevant.
> I have found that
Hi Mike,
On 9/19/10, Mike Feher wrote:
> Well, if one just looks at the spec of the 10811A for relative performance,
> it is -140 dBc/Hz at 100 Hz offset at 10 MHz. Realistically, probably a
> little better. From that it would be real easy to generate the frequencies
> Frank is looking for, obvio
On 9/19/10, jimlux wrote:
> francesco messineo wrote:
>> Hi Mike,
>>
>> as I said, current plans are for a few frequencies in the 20-50 MHz
>> range. The current project needs 20, 22 and 42 MHz oscillators.
>>
>
>
> But you're multiplying that up, it
On 9/19/10, jimlux wrote:
> francesco messineo wrote:
>
>>>> It's hard to explain why to ones not familiar with weak signal
>>>> operation between broadcasting signals, but really the noise floor
>>>> raise a lot when you have some 5 or 6 broadcasts
On 9/19/10, Bob Camp wrote:
> Hi
>
> The key point being that a fixed oscillator will have *much* better close in
> phase noise than your typical synthesized radio.
yes, I agree fully, in facts getting rid of the typical syntesized
radio is my final goal :-)
First step is the converter, second
acent
> channel rejection, so they don't worry a lot about it.
>
> Bob
>
>
> On Sep 19, 2010, at 12:04 PM, francesco messineo wrote:
>
>> On 9/19/10, Magnus Danielson wrote:
>>> Frank,
>>>
>>> On 09/19/2010 09:35 AM, francesco messineo wrote:
&
; PN at your stated offset? Regards - Mike
>
> Mike B. Feher, N4FS
> 89 Arnold Blvd.
> Howell, NJ, 07731
> 732-886-5960
>
>
>
> -Original Message-
> From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
> Behalf Of francesco messineo
>
On 9/19/10, Magnus Danielson wrote:
> Frank,
>
> On 09/19/2010 09:35 AM, francesco messineo wrote:
>> Hi
>>
>> On 9/19/10, Bob Camp wrote:
>>> Hi
>>>
>>> Is -195 dbc/Hz floor good enough or is it overkill?
>>
>> I'd sa
Hi Bruce,
On 9/18/10, Bruce Griffiths wrote:
> Another reference on VHF crystal oscillator circuits (if you can read
> German) is:
> http://www.axtal.com/data/buch/Kap6.pdf
> In particular Figures 6.20 and 6.21 on page 23.
unfortunately I don't read german, but it seem I understand those
circui
Hi
On 9/19/10, Bob Camp wrote:
> Hi
>
> Is -195 dbc/Hz floor good enough or is it overkill?
I'd say this is obviously overkill, -160 dBc/Hz could be a good compromise.
>
> Is -155 dbc/Hz at 100 Hz offset a requirement or is -40 dbc ok?
-40 dBc/Hz at 100 Hz is about useless, -150 dBc/Hz at 100
On 9/18/10, Magnus Danielson wrote:
>
> A simple PLL is not that complex these days. As long as you have fairly
> high comparator frequency after dividing down the VCO and reference you
> could get away fairly easilly. Standard programmable dividers in the TTL
> family and a single chip for phase
On 9/18/10, Magnus Danielson wrote:
> On 09/18/2010 02:41 PM, francesco messineo wrote:
>> First of all, thanks to John and Magnus for inputs and links, makes a
>> very good start!
>>
>> On 9/18/10, Magnus Danielson wrote:
>>> On 09/18/2010 09:48 AM, fran
First of all, thanks to John and Magnus for inputs and links, makes a
very good start!
On 9/18/10, Magnus Danielson wrote:
> On 09/18/2010 09:48 AM, francesco messineo wrote:
>> Hello all,
>>
>> sorry for the OT, but the electronic expertise of the group is too good
>>
Hello all,
sorry for the OT, but the electronic expertise of the group is too good :-)
I'm looking for ideas and directions (articles and so on) to realize
very good phase noise xtal oscillator, in the range 20-50 MHz for high
performance frequency conversion. I would like to understand what
circ
On 3/10/10, David Forbes wrote:
> With regard to the restoration and use of a derelict radio telescope for
> amateur radio, that's a fine example of amateurs putting themselves to a big
> task and succeeding. I work on radio telescopes, so I know how big a task
> that is.
Here in Italy, radio
Hi Stan,
On 2/26/10, Stan, W1LE wrote:
> Hello Francesco,
>
> After connecting to a known good power supply, active antenna, and
> computer,
> give it a chance to warm up and stabilize.
>
> After warm up, I get:
> +5VDC @ 0.250 A
> +12VDC @ 0.12 A
> -9VDC @ very low current, just barely mov
Hi all,
A friend just received a thunderbolt from an ebay seller today and
asked me to check it and wire a quick power supply for him.
I used a switching power supply, pc-like, just for testing and tried
both lady heather and tboltmon. I wired the power lines as the TVB web
page, but connected onl
On 2/2/10, Bruce Griffiths wrote:
> However injection locking also works when the frequencies ratios involved
> are rational numbers.
> For 22MHz and 10MHz, the corresponding ratio is 11/5 a rational number.
> For 42MHz and 10MHz, the frequency ratio is 21/5 a rational number
Then 2 MHz would w
Hi Murray and all,
Yes, indeed injection locking looks very interesting, and I started
reading around. Seems relatively easy for 22 MHz, but not as easy for
42 MHz (good values should be 6 or 7 MHz, right?).
So far the practical circuit I've seen are few, and this would make me
lean in favour of
d
Hi Murray,
On 2/2/10, Murray Greenman wrote:
> Frank,
>
> My suggestion would be to try injection locking, rather than a PLL. No
> change is made to the 22MHz and 42MHz oscillators, except to find a way
> to inject enough reference power to force them to lock to it. Injection
> locking works
Hi Murray,
On 2/2/10, Murray Greenman wrote:
> Frank,
>
> My suggestion would be to try injection locking, rather than a PLL. No
> change is made to the 22MHz and 42MHz oscillators, except to find a way
> to inject enough reference power to force them to lock to it. Injection
> locking works
Hi Bob,
On 2/2/10, Bob Camp wrote:
> Hi
>
> The first issue - your oscillator may be drifting quite a lot. If so, that's
> the first thing to check and possibly fix. A reasonable oscillator should be
> able to hold less than 100 Hz at 42 MHz under normal room conditions. Fixes
> range from ci
Hello all,
sorry for the OT, but I know there're many real electronic artists here.
As an amateur radio operator I often use transverters, some home made.
They usually can be made sigthly better (RF and noise-wise) than
japanese transceivers. However often the LO xtal oscillator drifts too
much fo
io transceiver, but that's not something I plan
to do soon (I don't see the need for it currently) and in that case I
will use better transistors for sure.
Thanks
Francesco
>
> Bruce
>
> francesco messineo wrote:
>
> > Hi all,
> >
> > indeed this is ve
Hi all,
indeed this is very interesting, can this buffer amplifier be used as
a building block for a distribution amplifier for the 10 MHz signal of
a thunderbolt? I remember having seen on the list a similar version
but with european transistors (like the ubiquitous bc548/bc558?) that
are very co
On 11/25/09, Robert Darlington wrote:
> Out here I'm almost exclusively on HF bands using the modern digital
> communications modes like PSK31. The first license (Technician) will not
> get you on the HF bands unless you count 6 meter (50MHz) as HF.
well, 6m isn't anything like HF (imho).
>
On 2/21/09, Magnus Danielson wrote:
> I'm considering a Linux port since I want to reduce my dependency on
> Windows at all times.
>
before knowing about the existence of lady heather I had started
coding a very simple Linux/Unix program that would work much like
tboltmon.exe (ncurses based).
On 2/17/09, Tom Clifton wrote:
> Any chance it is a Jupiter?
>
> http://www.gpskit.nl/gps-readme.html
>
> If so, they are fine receivers. THe header pins are 2mm spcing - same as
> used on laptop hard drive adaptors
>
It uses the same two chips (at least in one photo of a jupiter I have
seen t
Hi Roberto,
On 2/17/09, Roberto Barrios wrote:
> Hi Frank,
>
> The Rockwell 11577-11 is found in most TU-DXXX Rockwell-Jupiter GPS
> receivers. I've never seen anything like a RF switch on them, but you could
> have a custom or exotic one :). What they do have most times is a model
> number e
Hello all,
I have given a GPS receiver board from an old anti-theft system, it's
free for me to play with (and more are available if I ever figure out
if they can be useful). The board has a rockwell chipset for the GPS
part and two antenna connectors (selectable with an rf switch). Both
antennas
64 matches
Mail list logo
