I'm beginning to set up in my new house and planning where all my various
antennas are going to go. Being a wood frame building, I was wondering if it
was sufficient to simply mount my Thunderbolt GPS antenna high in the attic.
It
would be convenient as there is already a high quality
Thanks a lot guys for all the input!
The nist articles was a very interesting read. I have ordered the
minicircuits ZRPD-1 and will try to build the 2NA mixer to to see how
far that will take it. I probably also will build a low noise jfet preamp
to see if that will reduce the noise. But I
thanks Bob
Doug
From: Anders Time anderst...@gmail.com
To: time-nuts@febo.com
Sent: Monday, 26 November 2012, 9:45
Subject: Re: [time-nuts] Best phase detector / mixer for 100MHz?
Thanks a lot guys for all the input!
The nist articles was a very
Hello Anders,
I have used the Mini-Circuits ADE-1H as a combined mixer and phase comparator,
to lock a pair of Pascall OCXOFs together and give an output at twice the
frequency. With ~18-19dBm into the LO and RF ports, the output level at 2f
(from the IF port) was ~11dBm. The mixer didn't
This kind of discussion comes up regularly, so I wrote this age:
http://ko4bb.com/Test_Equipment/CoaxCableMatching.php
Didier KO4BB
Sent from my Droid Razr 4G LTE wireless tracker.
-Original Message-
From: M. Simon msimon6...@yahoo.com
To: time-nuts@febo.com time-nuts@febo.com
Sent:
Hi
I've spent a lot of time putting a lot of antennas in attics of many houses. I
can't say any of them didn't work. However, I never was happy with the
performance of any of them. Even a poorly located outdoor antennal outperformed
them. … and yes I'm a member of the no antennas outdoors
I've got an HP 8720D VNA. This has been out of support from Agilent
for 8 years, so its getting on a bit. There's a clock in the
instrument which keeps the date and time. This is losing about 1 day
per month (rough guess), so it has slowed by a bit over 3%.
I'm guessing this is likely to be a
Or install a frosted dome type skylight as a radome lights the attic and allows
for better reception
Sent from my iPhone
On Nov 25, 2012, at 10:15 PM, J. Forster j...@quikus.com wrote:
There are ways to do it w/o drilling holes. Most all houses have vent
stacks for the plumbing, typically 3
Or add vent pipe penetrations ~ 1.5 OD PVC pipe and put the GPS antenna
on top of the pipe.
Allows for vertical position variations. and the soft rubber gland
allows for changes later.
Had a new roof put on last year and I added 2 each of these plumbing
vent type roof penetrations.
Also
David
Try here, they have the service guide but no component level info
available that I can see.
_http://na.tm.agilent.com/8720/document.htm_
(http://na.tm.agilent.com/8720/document.htm)
Regards
Nigel
GM8PZR
In a message dated 26/11/2012 14:12:55 GMT Standard Time,
Hi
Simple answer - no. More complicated answer - you can see a crystal jump to
a spur, but they are going to be *above* the main mode for a normal clock
crystal. If that happens, the clock will run to fast, not to slow.
Bob
-Original Message-
From: time-nuts-boun...@febo.com
I considered that about 5 years ago when I reroofed. The roofing
contracctor told me that anything like a skylight is very, very hard to
make and keep leakproof. You really, really don't want a leaky roof.
-John
=
Or install a frosted dome type skylight as a radome lights the
Hi TimeNuts,
What are people using for surge arresters between your GPS receiver and the
antenna, at the entrance to your house?
I've got an entrance panel set up for HF, with copper ribbon to two ground
rods. I'd like to add a connection for my GPSDO.
I know the frequency is about 1.6GHz,
Have you contacted ArtekMedia for any manual information?
Also, have you checked/posted a question to the VNA Agilent Forum?
-John
==
I've got an HP 8720D VNA. This has been out of support from Agilent
for 8 years, so its getting on a bit. There's a clock in the
instrument
Hi
Commercial units designed for cell tower use often show up on eBay for sub
$20 prices. Since they are set up for the frequency (1.5 GHz), the levels
(RX, so no power), and the purpose there isn't a lot of need for anything
else. Last time I bought some, they came as part of a kit that also
The tax assessors count the vent pipes when trying
to guess at numbers of bathrooms, sinks, etc. in
your house. Add too many, and you could be seeing
an increase in your tax bill.
-Chuck Harris
Stan, W1LE wrote:
Or add vent pipe penetrations ~ 1.5 OD PVC pipe and put the GPS antenna on top
There really isn't anything that will protect your
receiver if the antenna takes a strike. But, if
you pass the coax into your house using a well
grounded bulkhead connector, you can protect your
house.
I got one GPS antenna that had an EMP protector
attached to it (came from NSA)... since the
Didier,
Nice page, but your first plot with R1 = 0 ohms and no R2 shows too much
ringing.
With proper impedance matching that setup will give the best results, meaning
the highest voltage pulse, no ringing, the lowest power consumption, etc.
Could be that your signal generator needs a
On 26 November 2012 16:00, J. Forster j...@quikus.com wrote:
Have you contacted ArtekMedia for any manual information?
No. First I'll try to get a free one!
Also, have you checked/posted a question to the VNA Agilent Forum?
Yes. Only a few hours ago (just before I posted on time-nuts I
I asked Wenzel about mixers for phase noise measurement and they directed me
to Marki Microwave as what they use:
http://www.markimicrowave.com/2770/Mixers.aspx I have not obtained or
tested any myself but it's a pretty solid recommendation I think.
I got this guy to add cross correlation to his
I don't use one on my gpsdo feed line. The shield of the feed line is
grounded prior to it entering the house and I don't live in a lightning prone
area. The gps antenna I use apparently has diode protection to provide some
immunity to near by lightning strikes. Most of my radio antennas
I have a box-full of GPS protectors that were built by a company called
ZapTech. They are just coaxial gas tubes that seem to have a strike voltage
around 60-90 volts. We replaced them with (MUCH) more expensive PolyPhaser
units. I use the ZapTechs on all of my long (600-800 ft) low-freq receiving
They are no harder than a chimney to keep leakproof unless they are flush in
which case everything said is true. You need structure and a leakproof
membrane and proper flashing to redirect water
Sent from my iPhone
On Nov 26, 2012, at 10:38 AM, J. Forster j...@quikus.com wrote:
I
Said, in the text I indicated the source was not a 50 ohm terminated signal
generator, but the 1 pps output of a Thunderbolt with about 5 ohm impedance,
hence the ringing.
Didier
Sent from my Droid Razr 4G LTE wireless tracker.
-Original Message-
From: Said Jackson saidj...@aol.com
There's not much in this world that is able to reliably protect a radios
input from a direct lightning hit (maybe a block of copper instead of
the antenna...). But a surge protector (sometimes called EMP protector
or surge arrester) can increase the probability that a nearby lightning
strike
Cable question: I assume that won't be the problem. I use my 26dB
Trimble timing antenna with RG-213 because of the low loss (and the low
cost). Before that I had 15 m (45 feet) of RG-58 combined with a car
roof magnetic patch antenna in use without any problem. Any 50 Ohm cable
can be used,
Anders,
On 11/26/2012 10:45 AM, Anders Time wrote:
Thanks a lot guys for all the input!
The nist articles was a very interesting read. I have ordered the
minicircuits ZRPD-1 and will try to build the 2NA mixer to to see how
far that will take it. I probably also will build a low noise jfet
Hi
RG-6 quad shield satellite TV cable is pretty much the low cost / low loss
way to go for feed line. The TBolts are set up to use it by default.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Volker Esper
Sent: Monday, November
Hi
or you could see if somebody with it already in their free time related
program would add a sound card or set of cards to the mix of devices they
support.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Magnus Danielson
If you get a direct hit pretty much nothing can save you. Except luck. Because,
when you are trying to get signals in on the one hand and keep lightning out on
the other, strange things can happen.
I had a long wire about 100 ft long (outdoor length probably on the order of 80
ft.) around
Hi
There are commercial sites that routinely take multiple hits per hour
without going off line. It's not cheap, and it's not easy, but by no means
is it a noting can save you sort of situation.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]
Hello TNutters,
maybe new thread?
you can have a look at two specsheets of the MT3339 chipset on my FTP-site
1) http://nixie.ramdac.be/TNutstuff/MT_IT530_Data_Sheet_rev_1_0.pdf
on page 8 PPS output 100 ms high pulse, rising edge +/-1 μs @
full second GPS epoch... so it
Didier,
Oh, ok that makes sense, but that is a non-standard output, so not sure
that you want to use such an output as a sample case for generic applications.
Alternatively maybe rename the page to Trimble CMOS-output Coax Cable
Impedance Matching to make that clear.
It would be better
Skylights and such are easy to keep leakproof, but you do have to check the
plastic parts every once in a while. Years ago I installed one of those
sun-tunnel type tubes for a small, windowless bath, and it worked great;
however, about the time I replaced the roof, I discovered that the
Said,
I agree. I intended to complete the page by doing more tests, but the
interesting point of the demonstration is that it is sufficient to match the
cable at the far end, and in doing so, you preserve the full amplitude of the
pulse. If you put 45 ohms in series and terminate in 50 ohms at
saidj...@aol.com said:
Nice page, but your first plot with R1 = 0 ohms and no R2 shows too much
ringing.
It shows what I expect. I thought it was an example of what happens if you
set things up that way, not how to get the best results.
With proper impedance matching that setup will give
Hello Jacques, and the List.
Thank you for sharing these docs.
Indeed the PPS specs of the MT3339 are confusing.
Maybe measurement on a living specimen can help?
I have a R-D 1992 counter, and a GPIB interface.
When I will have the GPS I will be able to log
some data on the PC, although I never
You need a reference to test the PPS output from a GPS receiver. That is,
you need an already running GPSDO so that its stable PPS output can act as
the reference for your test. Then you need a time interval counter and use
the GPS under test PPS as start and the reference PPS as stop (or the
Unfortunately, many of the surge arresters available on ebay do not pass DC
or have a DC shunt to ground internally. This means they won't work with an
amplified antenna. Make sure any suppressor you get will pass the DC current
to the antenna.
Al, K9SI, retired
If you were going to add a pipe for coax purpose, wouldn't you want something
like the electrical service inlet? They have a bit of a hook on the top to
reduce water penetration.
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OK, try that setup, measuring the period every 2s. You should end up with a
file (use the GPIB) with the PPS periods and so you can apply the usual
statistic computations. You should, at that point, be able confirm or not
the strange datasheet reporting 1uS first, then 100nS and finally 10nS.
On
Hi Didier,
yes, if you put a 50 Ohm termination at the far end all looks good, but you
are still driving a 91mA DC current through the cable during the high
times, and that will have rippling effects on the driver board by loading the
5V power supply down with a 1Hz period.
And if you
Hi all;
I 'm hearing Loran C signals here in northern Indiana this evening, I
guessing from New Jersey. Anyone else hearing these?
Rich
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You don't need that. Just a straight vertical pipe is perfect for a GPS
antenna. All the outdoor are designed with the coax dropping straight down
vertical into a pipe.All of them have a mount with pipe threads that
makes a 100% waterproof connection.Lacking a mount, use a pipe flange
You can measure the cycle to cycle jitter of the GPS PPS output using
the Racal Dana 1992 down to the nanosecond pretty easily with the
caveat that it will only measure alternate cycles.
Period mode or Time Interval A to B mode will work for this
measurement of a 1 Hz source. If you have a
If you daisy chain the cable (or PCB trace) past several receivers, the signal
at the non-terminal receivers will have a flat spot in the middle. It will go
up half way, stay there for the time for the signal to get to the end and back,
then go to full voltage. That flat spot is asking for
The antenna I got fron Nichegeek on ebay uses British Pipe Threads! Just can't
get anything here that matches it. Perhaps I should just get a unit with
regular NPT size threads? Can anyone recommend a specific model which works
well with the Thunderbolt and has such a threaded bottom?
Peter
On 11/26/2012 8:51 PM, Peter Gottlieb wrote:
The antenna I got fron Nichegeek on ebay uses British Pipe Threads! Just
can't get anything here that matches it. Perhaps I should just get a
unit with regular NPT size threads?
Why not just get a pipe nipple of close size, and grind off enough of
On Mon, Nov 26, 2012 at 5:51 PM, Peter Gottlieb n...@verizon.net wrote:
The antenna I got fron Nichegeek on ebay uses British Pipe Threads! Just
can't get anything here that matches it. Perhaps I should just get a unit
with regular NPT size threads? Can anyone recommend a specific model
I suppose, although interestingly there isn't anything close. It just misses
one size and the next smaller one it swims in. Although with enough epoxy...
OTOH, who cares, it's sitting up where nobody will look closely and it's not
like it's a structural element. So your suggestion looks
Unfortunately not, it's part of the molded bottom piece of the antenna casing.
On 11/26/2012 9:24 PM, Chris Albertson wrote:
On Mon, Nov 26, 2012 at 5:51 PM, Peter Gottlieb n...@verizon.net
mailto:n...@verizon.net wrote:
The antenna I got fron Nichegeek on ebay uses British Pipe
You might better use RTV. I's plenty strong enough and can be taken apart
if needed.
-John
=
Unfortunately not, it's part of the molded bottom piece of the antenna
casing.
On 11/26/2012 9:24 PM, Chris Albertson wrote:
On Mon, Nov 26, 2012 at 5:51 PM, Peter Gottlieb
In practice, I suspect what I use will be what I have on hand at the moment ;-)
On 11/26/2012 9:34 PM, J. Forster wrote:
You might better use RTV. I's plenty strong enough and can be taken apart
if needed.
-John
=
Unfortunately not, it's part of the molded bottom piece of the
On 11/26/12 10:11 AM, Demian Martin wrote:
I asked Wenzel about mixers for phase noise measurement and they directed me
to Marki Microwave as what they use:
http://www.markimicrowave.com/2770/Mixers.aspx I have not obtained or
tested any myself but it's a pretty solid recommendation I think.
Jim Lux wrote:
On 11/26/12 10:11 AM, Demian Martin wrote:
I asked Wenzel about mixers for phase noise measurement and they
directed me
to Marki Microwave as what they use:
http://www.markimicrowave.com/2770/Mixers.aspx I have not obtained or
tested any myself but it's a pretty solid
Was wondering if anyone ever confirmed the type of RF connector found
internally in the FE-5860a?
I've seen several posts calling it a Hirose U.FL, but the linked thread
suggests that it might actually be an OSMT connector:
http://www.vklogger.com/forum/viewtopic.php?t=10289
Or is everyone
Jim Lux wrote:
On 11/26/12 10:11 AM, Demian Martin wrote:
I asked Wenzel about mixers for phase noise measurement and they
directed me
to Marki Microwave as what they use:
http://www.markimicrowave.com/2770/Mixers.aspx I have not obtained or
tested any myself but it's a pretty solid
A premade U.FL to SMA cable worked fine for me, a few years ago in my
5680A. However as mentioned a few days ago, there are _many_
variations/generations of this unit. FEI might have changed the connector.
--
Björn
Was wondering if anyone ever confirmed the type of RF connector found
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