Hi,
For those with a junk basket full of generic splitter/combiners and
DC-blocks, go ahead and put something together. Note that most receivers
wish to have a DC-load of around 200ohm to not raise antenna fault alarms.
I have not found a dedicated GPS splitter cheaper than this from
Hi,
Regarding DC load, a friend had problems, so my quick fix was a BNC tee with a
SMD inductor in series with a load resistor between tip and shell on one of the
BNC branches. Fixed the problem so that when the receiver saw the load it also
accepted the GPS signal it was already seeing but
Björn,
Thanks for letting us know - price isn't too bad - gotta love the P/N - ZAP
D - makes you wonder if they have a sense of humor.
Regards,
John W.
*Ordering,Pricing Availability Information*
http://www.minicircuits.com/MCLStore/ModelPriceDisplay#*Select Country*
Those units (TAS320, TAS520, TAS720) were designed mainly for the
optical drives test and it seems that they are limited to 20ms maximum
time interval measure in time stamp mode, not suitable for PPS
measurements.
On Tue, Oct 7, 2014 at 1:53 AM, wb6bnq wb6...@cox.net wrote:
Dave,
Should have
John,
Note that Mini-Circuits seems to have made lots of other (GPS) splitters
for Lucent and others.
http://www.ebay.com/itm/Mini-Circuits-3-Way-Power-Splitter-Combiner-ZB3PD1-1575DC1S-/270834416075
--
Björn
Björn,
Thanks for letting us know - price isn't too bad - gotta love the
At work, I'm putting together a multichannel stepped frequency CW radar
breadboard, and I'm looking for something to serve as a source that I
can step quickly.
I'm looking at stepping every millisecond or so. Right now, I use a
Ardunino type microcontroller driving a serial DAC driving a
You should be able to use DDS test-boards and by timing your last write,
you should be able to time the frequency jump.
The STEL-1173 takes 6 bytes, but writing the last one latches all 6
bytes over to a single 48 bit word. I expect that other DDSes have the
same distinct transfer-phase if
Yokogawa has been around for quite some time. They make some very nice
self contained data recorders and data acquisition systems. Think of
high resolution oscilloscopes with 8 or 10 channels and large hard
drives for data storage. They have interchangeable amplifiers, for
thermocouples or voltage
In message 54341cbf.9080...@earthlink.net, Jim Lux writes:
Maybe some DDS in a box product? That will take my nice clean 10 MHz
reference?
DDS is by far the easiest, but the question is if it is clean
enough.
Some of the HP generators which go cheap-ish in eBay are pretty
agile too.
Jim I am not sure if this will meet your requirement for hygene but google
Trinity Power Inc (Bob Yarbrough) he has a unit that was featured in EDN
some time around a year ago. I doesnt switch fast enough at present but that
could be altered. the problem might be that I think it is a PLL
Hi
Consider that stepping every ms means settling in much less than that. If you
need 100 us settling, a pair of synthesizers is probably the only way to go.
Use some sort of modulator / switch between them to keep the key clicks from
driving you nuts.
Bob
On Oct 7, 2014, at 1:02 PM, Jim
I have two versions of the ADF4351 dds. One is the AD eval board, and the
other the TPI synthesizer
(http://www.rf-consultant.com/calibrated-signal-generator/) at $280 that might
do the job. The latter device performs well. It will be as good as the 4351, I
think. It has a programmable attenuator.
Here's the latest on the root cause:
http://gpsworld.com/improper-fuel-line-installation-led-to-incorrect-galileo-orbit/
/tvb
- Original Message -
From: jim s jwsm...@jwsss.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Saturday, August 23, 2014
jim...@earthlink.net said:
I could hook a Prologix on the back of a PTS with GPIB, and hit it over the
ethernet, but I'm not sure I'd be able to get the steps to occur when I
want them (ethernet and determinism do not go well together).
Timing on Ethernet is as good as RS-232 if you have a
On Tue, Oct 7, 2014 at 8:32 PM, Magnus Danielson mag...@rubidium.dyndns.org
wrote:
Some of the modern DDSes can take 10 MHz directly and step it up
internally before hitting the DDS core, but it may be that you need to
synthesize a higher clock from the 10 MHz first.
We've been
What is your definition of low noise / purity ?
DDS and low noise take some pretty good engineering.
What is the min frequency ?
What is the step size ?
As to PTS's it took me around an hour to make a cable write the C code to
convert to its interface needs. If I had
not lost the
Hi Anders,
in the absence of a true phase noise analyzer the next best thing is to use
one of the Agilent 856x analyzers with the phase noise measurement
software plug-in.
By chance I had looked at Ebay over the weekend and those two can be had
for around $3500 these days (with an
In message 20141007200046.02aa9406...@ip-64-139-1-69.sjc.megapath.net, Hal Mu
rray writes:
Timing on Ethernet is as good as RS-232 if you have a point to point link
rather than a huge network full of crappy software.
That is a truth with an almost uncountable number of footnotes...
If
Jim,
This reminds me of a project I did back in the early1990's. (Hopefully
we have advanced a bit since then.) It used a bunch of quad latches, some
74138's, a UART, and an RS232 converter. It drove a PTS 40. The UART used
the first 4 bits for BCD frequency and the last four bits to
Hi Don, Jim, that is the one I was refering to, It has a VCO as the source
(all part of the AD4351) but I think your description of the unit is more
accurate that mine. Contact him directly he is keen to contact new areas and
hobbyists. There are two units one is a source with 4 output levels,
On 10/7/14, 10:28 AM, Poul-Henning Kamp wrote:
In message 54341cbf.9080...@earthlink.net, Jim Lux writes:
Maybe some DDS in a box product? That will take my nice clean 10 MHz
reference?
DDS is by far the easiest, but the question is if it is clean
enough.
Yes, probably clean
On 10/7/14, 10:32 AM, Magnus Danielson wrote:
You should be able to use DDS test-boards and by timing your last write,
you should be able to time the frequency jump.
The STEL-1173 takes 6 bytes, but writing the last one latches all 6
bytes over to a single 48 bit word. I expect that other DDSes
Hi
The output spectrum of some DDS’s is pretty rich. You may find that a 1 GHz DDS
can be filtered to operate directly over the 3.1 to 3.4 GHz.
Bob
On Oct 7, 2014, at 7:36 PM, Jim Lux jim...@earthlink.net wrote:
On 10/7/14, 10:32 AM, Magnus Danielson wrote:
You should be able to use DDS
On 10/7/14, 12:43 PM, Anders Wallin wrote:
We've been using/testing an AD9912 eval-kit board. It can take 10MHz input
and has an internal 66x PLL and VCO for a 660MHz DDS sample-clock (just out
of spec actually, vco is min 700MHz if I read the datasheet correctly).
Output looks like so:
On 10/7/14, 1:19 PM, Don Latham wrote:
I have two versions of the ADF4351 dds. One is the AD eval board, and the
other the TPI synthesizer
(http://www.rf-consultant.com/calibrated-signal-generator/) at $280 that might
do the job. The latter device performs well. It will be as good as the 4351, I
On 10/7/14, 4:43 PM, Bob Camp wrote:
Hi
The output spectrum of some DDS’s is pretty rich. You may find that a 1 GHz DDS
can be filtered to operate directly over the 3.1 to 3.4 GHz.
Oh, clever idea.. Yes.. there is substantial harmonic content, and one
could easily arrange to have more. And
Jim,
Bob Yarbrough's built units do 50 to 4400MHz, +10dBm and input for external
10MHz ref signals, though has an internal 10MHz TCXO. It sounds worth a try
if it can be programmed to step fast enough, min step size is 1kHz (from
memory).
Alan
G3NYK
- Original Message -
From: Jim
Kratos (www.kratosepd.com) do fast switching synthesiser subsystems that can
be locked to a reference..
Aeroflex (www.aeroflex.com/ASCS) do 250ns settling time synthesisers.
Bruce
On October 7, 2014 at 7:52 PM Jim Lux jim...@earthlink.net wrote:
On 10/7/14, 1:19 PM, Don Latham wrote:
I
http://gmcatalog.kratosepd.com/index.cfm?act=prodsforgroupgrp=45
http://ams.aeroflex.com/ASCS/micro-ASCS-prods-synthesizers.cfm
are the relevant webpages
Bruce
On October 7, 2014 at 11:06 PM br...@ko4bb.com br...@ko4bb.com wrote:
Kratos (www.kratosepd.com) do fast switching synthesiser
On 10/7/14, 2:26 PM, Poul-Henning Kamp wrote:
In message 20141007200046.02aa9406...@ip-64-139-1-69.sjc.megapath.net, Hal Mu
rray writes:
Timing on Ethernet is as good as RS-232 if you have a point to point link
rather than a huge network full of crappy software.
That is a truth with
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