Lightening arresters don't have to handle that much energy.
When a strike hits a mast with an antenna on it the current divides. Most
of it should go straight down the tower or mast into the ground. This is
why the structure is bonded to a grounding system using a straight line
path with ground
you can try the following vendor (RF Elettronica):
http://www.rf-microwave.com/en/shop.html
They ship abroad and prices are rather good.
_ Elio.
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I did a little calculation and it's a 10 digits counter.
log(10,000,000,005) = 10.
There is still a big gap between this one and 53132A :(
For 53132A, the time resolution is 150ps, which I think is 10digits/s with
interpolator. According to the schematics the only difference between
53132A
Hi
Actually there *is* a reason for all the posts. This stuff comes onto the
market very rarely. It *is* legitimate Time Nut gear. While it’s here at a low
price it’s worth letting people know about it. The Z3801’s were a cheap item
once upon a time (like $150 or so). The TBolt’s were sub $70
Tim
I have nothing.
But if it seems operational given the time frame it was built you may run
into the gud ole rollover issue. This can usually be gotten around by
setting the date and time to a 1024 week from whatever the GPS week is
today.
There are calculators online.
But I suspect if it powers
Hi
On Nov 28, 2014, at 6:26 AM, Li Ang lll...@gmail.com wrote:
I did a little calculation and it's a 10 digits counter.
log(10,000,000,005) = 10.
There is still a big gap between this one and 53132A :(
Not if you can hit the advertised time resolution of your chip. Keep on working
on
Hi
On Nov 28, 2014, at 7:04 AM, Li Ang lll...@gmail.com wrote:
The TDC-GP22 is the best choise for me at the moment. Since I am not a
hardware guy, simplicity is important. It's very cheap in China(About 3$
for each piece ).
Which is a very good reason to play with it …
TDC-GP22 has
Hi
One quick thing to check (I have never seen one of these):
Some of the early boxes used downconverters at the antenna end rather than just
a preamp at the antenna. On a few boxes the giveaway was two coax ports headed
to the downconverter. On most everything was multiplexed on one cable.
1) What frequency is the crystal at? (can you drive the chip from an OCXO?)
I'm clking this chip with the refclk/2=5Mhz, which is done by cpld.
something like always @(posedge refclk) tdc_clk = ~tdc_clk; Not sure if
it's noisy.
2) Is there more bypassing on the circuit than shown? (If not, add
Hi
On Nov 28, 2014, at 10:14 AM, Li Ang lll...@gmail.com wrote:
1) What frequency is the crystal at? (can you drive the chip from an OCXO?)
I'm clking this chip with the refclk/2=5Mhz, which is done by cpld.
something like always @(posedge refclk) tdc_clk = ~tdc_clk; Not sure if
it's
Hi
Any form of protection (no matter what you are protecting against) is part of a
system. The more complex the system, the more it costs and the larger it gets.
The more details you cover in your system the more 9’s you get to put in the
“99.9xxx% protection” statement. Is there an event out
Any of the group using the TADD-1 from TAPR. Perhaps that unit along with
double shielded cables would work for most folks. Looking at the past
threads are we trying to reinvent the wheel for a distribution solution?
73,
Bill, WA2DVU
Cape May
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Rick,
Thanks for the brief review of MiniCircuits stuff (I'm not connected with
them in any way except as a customer).
Since you've characterized some of their parts, perhaps you could help
answer a question that someone else posted, and one that I would like to
have answered as well.
Have you
Bill, there are lots of us here that are well aware of the TAPR products,
and recognize their merits. There are also lots of us here that like to
roll our own (me included). Many of us aren't engineers or engineering
students, but we still like to participate in the technology.
A little help,
Hi Dave,
Speaking only for myself, most of the fun is in the reinventing of the wheel.
I have no real use for a frequency standard, but designing and building my
GPSDO has been very rewarding. Eventually I hope to be able to share it with
someone besides Dan, who has been a big help on the
On Fri, Nov 28, 2014 at 10:23 AM, Dave M dgmin...@mediacombb.net wrote:
A little help, in the form of a schematic or a detailed construction
project, is always welcome,
Then look at the TAPR user manual. Schematic and layout are in the
manual. You can modify it to suit your needs. I think
On 11/28/2014 10:08 AM, Dave M wrote:
Rick,
Thanks for the brief review of MiniCircuits stuff (I'm not connected
with them in any way except as a customer).
Since you've characterized some of their parts, perhaps you could help
answer a question that someone else posted, and one that I would
Hi
On Nov 28, 2014, at 2:27 PM, Richard (Rick) Karlquist rich...@karlquist.com
wrote:
On 11/28/2014 10:08 AM, Dave M wrote:
Rick,
Thanks for the brief review of MiniCircuits stuff (I'm not connected
with them in any way except as a customer).
Since you've characterized some of their
All:
After running my 20 MHz LTE-Lite for a week or so, I shut it down and
connected one of the 10 MHz units.
The LEDs appear to be responding (survey still in progress) as per the
quick start guide.
Windows installed a new comm port and driver. (COMM6, with FTDI
driver) The COMM5 port
Hi
The “new chip ID, new com port” thing is pretty typical for the FTDI drivers.
If you plug the old LTE back in there’s a good chance it will come back up as
COMM 5. Usually they are pretty good about only adding ports for devices they
have not seen before.
Bob
On Nov 28, 2014, at 3:23 PM,
On 11/28/2014 1:04 PM, Bob Camp wrote:
If you do need to run substantial current through a choke core, the larger
binocular cores with a half turn through them are a better choice.
Still useless for 20A (or even 2A) though …
Bob
The binocular cores come in several hole sizes.
All other
The very tiny cores on MiniCircuits transformers will start to
saturate at hundreds of mA. The effect is that the magnetizing inductance
drops, which matters more at low frequencies than high frequencies. I try
to avoid feeding DC to an amplifier through a transformer winding.
Instead I use a
All:
Sharing lessons learned the hard way . . .
After messing around with my Anti-Virus program, which declared some
false threats, messing with drivers, and uninstalling/reinstalling
Ublox, I put the 20 MHz unit back on line. Instantly came up and showed
data in UBLOX.
Shut it down,
On 11/27/2014 03:08 PM, lllaaa wrote:
Hi guys,
I've just get my homebrew counter working. And the resolution seems 10x
better than my RACAL DANA 1992.
This counter is heavily inspired by the idea from Kasper Pedersen.
http://n1.taur.dk/permanent/frequencymeasurement.pdf
On 11/28/2014 6:57 PM, Bob Camp wrote:
/A mountain top (or skyscraper top) communications setup can be designed to//
//take multiple direct lightning hits an hour and keep right on going and do//
//it for may years. There are//*lots*// of systems out there like that./
Last April 25 there was
kb...@n1k.org said:
The ânew chip ID, new com portâ thing is pretty typical for the FTDI
drivers. If you plug the old LTE back in thereâs a good chance it will come
back up as COMM 5. Usually they are pretty good about only adding ports for
devices they have not seen before.
Most/some
Assume the temperature is stable and the power supply is clean and we aren't
testing one of the PLL units and ...
What's the ADEV and/or phase noise of a typical low cost oscillator package?
Are there slightly more expensive parts that are a lot better? Is there
something in the data sheets
Am 28.11.2014 um 23:42 schrieb Dave M:
A couple weeks ago, I sent an email to the Minicircuits technical
support folks in hopes of getting this, or similar, info about a
couple of their transformer models (specifically, T1-1 and T4-1-KK81),
but so far, I'm still waiting. Guess I should give
On Fri, 28 Nov 2014 21:04:27 +0800, you wrote:
The TDC-GP22 is the best choise for me at the moment. Since I am not a
hardware guy, simplicity is important. It's very cheap in China(About 3$
for each piece ).
TDC-GP22 has 2 modes and 3 trigger inputs (start, stop1, stop2). The min
time between
Gerhard Hoffmann wrote:
Am 28.11.2014 um 23:42 schrieb Dave M:
A couple weeks ago, I sent an email to the Minicircuits technical
support folks in hopes of getting this, or similar, info about a
couple of their transformer models (specifically, T1-1 and
T4-1-KK81), but so far, I'm still
On Fri, Nov 28, 2014 at 12:23 AM, Said Jackson via time-nuts
time-nuts@febo.com wrote:
Plus the Z3801A seems to just work.
On the Lucent boxes we had to suffer through many 100's of posts over the
last month...
To be fair there doesn't seem to be a 3810 manual so some details needed
Hi
On Nov 28, 2014, at 8:48 PM, Dave M dgmin...@mediacombb.net wrote:
Gerhard Hoffmann wrote:
Am 28.11.2014 um 23:42 schrieb Dave M:
A couple weeks ago, I sent an email to the Minicircuits technical
support folks in hopes of getting this, or similar, info about a
couple of their
On Fri, 28 Nov 2014 08:57:37 -0600, you wrote:
Hi
On Nov 28, 2014, at 7:04 AM, Li Ang lll...@gmail.com wrote:
The TDC-GP22 is the best choise for me at the moment. Since I am not a
hardware guy, simplicity is important. It's very cheap in China(About 3$
for each piece ).
Which is a
Hi,
For Windows, ComPortMan does a great job of managing comm port
assignments. Available at http://www.uwe-sieber.de/comportman_e.html
Cheers,
david
On 29/11/2014 9:42 AM, Hal Murray wrote:
kb8tq-wyfad0z3...@public.gmane.org said:
The “new chip ID, new com port†thing is pretty
On Nov 28, 2014, at 9:18 PM, Angus not.ag...@btinternet.com wrote:
On Fri, 28 Nov 2014 08:57:37 -0600, you wrote:
Hi
On Nov 28, 2014, at 7:04 AM, Li Ang lll...@gmail.com wrote:
The TDC-GP22 is the best choise for me at the moment. Since I am not a
hardware guy, simplicity is
Thanks guys,
It was just a matter of curiosity, there's one locally for sale on ebay
and I hadn't seen one before :)
cheers
Tim
--
VK2XAX :: QF56if23 :: BMARC :: WIA :: AMSATVK
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On Fri, Nov 28, 2014 at 3:42 PM, Hal Murray hmur...@megapathdsl.net wrote:
kb...@n1k.org said:
The “new chip ID, new com port” thing is pretty typical for the FTDI
drivers. If you plug the old LTE back in there’s a good chance it will
come
back up as COMM 5. Usually they are pretty good
For Linux, I worked this up and posted to linuxquestions.org. I don't
guarantee it, but it's been working for the PL-2303 devices for me. It just
creates a link to the real driver. There are probably better ways to do it.
File: /etc/udev/rules.d/70-persistent-usb.rulesACTION==add,
John wrote:
For the most part, you don't want transformer isolation unless you
plan on using balanced lines. There are worse things than ground
loops out there, and lifting a coax shield away from ground is a
great way to find all of them.
You certainly need the shield grounded at RF, but
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