I am hoping to buy a SR620 from a seller who is not familiar with the
instrument, but who
1) Has knowledge of electronic test equipment in general.
2) Is willing to test the SR620 before an international shipment.
This puts me in a somewhat better position than typicall eBay sale with
comments
A single 2N or equivalent transistor in a suitable circuit dissipating
about 200mW or so can achieve a reverse isolation of 35dB with distortion of
around -40dBc (output +13dBm) with a gain of unity, and an output impedance of
50 ohms with a PN floor of around -180dBc/Hz or so.
Bruce
Bruce wrote:
Another issue is that if even one output needs high reverse isolation and
low crosstalk, then even those outputs that arent so critical will also need
high reverse isolation and low crosstalk to avoid degrading the crosstalk
to the critical output.
This brings up the distinction
http://www.gocomics.com/pickles/2014/11/26
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Hi Warren,
I arrive a bit late to this discussion, but I hope I can help. I guess the
reason for using only one edge is based on the fact that WR is originally
designed to measure the phase between a decoded data clock and a system
clock. The problem is that this decoded data clock is locked to
They use the LEA-6T for DIY drone applications because it provides raw
carrier phase information. The raw carrier info is compared with the raw
carrier data from a nearby fixed (and surveyed for an extended period) GPS
receiver. The position error of the fixed station is subtracted from the
...The problem is that this decoded data clock is locked to the incoming
data by means of a PFD in the Spartan6/Virtex6 GTP. The PFD normaly only
looks at rising edges, so any change in the clock duty cycle will translate
in a phase change in the falling edge and not in the rising edge. I am
Bruce wrote:
A single 2N or equivalent transistor in a suitable circuit
dissipating about 200mW or so can achieve a reverse isolation of
35dB with distortion of around -40dBc (output +13dBm) with a gain of
unity, and an output impedance of 50 ohms with a PN floor of around
-180dBc/Hz or
As I say a most useless website.
Regards
On Tue, Nov 25, 2014 at 10:35 PM, Dave Martindale dave.martind...@gmail.com
wrote:
I spent a bit of time poking around the SkyTraq web site on the weekend. I
couldn't find a datasheet for the chip on the LTE-Lite - perhaps it's so
new that SkyTraq
Hello everyone.
Currently my Stratum 1 NTP server is made up of the following:
Pentium 4 Motherboard, Single core, 1.4GHz., 1GB memory
Slackware Linux, 11.0.0
PPSkit-2.1.7 Kernel
uname -a:
Linux timelord 2.4.33.3-NANO #1 Fri Nov 12 21:28:51 EST 2010 i686
pentium4 i386 GNU/Linux
Motorola, GPS
Hi All,
I've been playing with some double oven HP10811's. I've been monitoring
the internal oven feedback vs. temperature and noticed something
interesting last night. There was a sudden step change in internal oven
feedback voltage. This is the voltage coming from the amplifier
monitoring
Said,
Your drawing looks better than those by Bob Pease, and he was never
embarrassed by his :)
Thank you for your extensive contributions to time nuts
Didier KO4BB
On Tue, Nov 25, 2014 at 7:28 PM, S. Jackson via time-nuts
time-nuts@febo.com wrote:
Guys,
I never expected such an intense
Almost. 1:1:2 (turns ratio) transformers used in each stage and 1:1
transformer on input. This allows a lower power supply voltage to be used.
One thing to watch with minicircuits transformers is core saturation due to
dc flowing in the windings.
Bruce
On Wednesday, November 26, 2014 08:52:14
:)
Sent From iPhone
On Nov 26, 2014, at 9:20, Didier Juges shali...@gmail.com wrote:
Said,
Your drawing looks better than those by Bob Pease, and he was never
embarrassed by his :)
Thank you for your extensive contributions to time nuts
Didier KO4BB
On Tue, Nov 25, 2014 at 7:28
Interesting comment. . . . I'm reading Bob's book now!
Never met him, but felt like I knew him from all of his writings.
His death was very sad
Jim
wb4...@amsat.org
On 11/26/2014 12:20 PM, Didier Juges wrote:
Said,
Your drawing looks better than those byBob Pease, and he was never
Jim,
A double tragedy. I was working with Jim Williams on one of our designs a week
before he passed away. Then Bob crashed his car coming from Jim's funeral
(grief?) and died too.
Two of the greatest analog minds lost within days.
Bye,
Said
Sent From iPhone
On Nov 26, 2014, at 9:34, Jim
Hi!
Navspark has one board with Glonass
(http://navspark.mybigcommerce.com/navspark-gl-arduino-compatible-development-board-with-gps-glonass/)
and one board with Beidou
(http://navspark.mybigcommerce.com/navspark-bd-arduino-compatible-development-board-with-gps-beidou/).
Both
use a Venus 8
Poul are you teferring to the lte lite specifically? My Resolution SMT GG
will go single sat or OD mode with only non GPS sats available.
On Tuesday, November 25, 2014, Poul-Henning Kamp p...@phk.freebsd.dk wrote:
In message 7da89.51b7dfcf.41a65...@aol.com javascript:;, S. Jackson
List,
I received my set (REF-0 REF-1) today and both units have production date
2000 week 5 and were packed in blue foam and a mylar ESD save bag.
The outer box was opened by eBay, easy to detect due to the eBay tape that was
used to close the box again. Maybe because it was shipped via UK and
Hello All...
SELLING: HP 10544A Xtal Osc
Osc Assembly and converter board that goes from the
Osc TRW/Cinch connector to 15 pin edge connector.
Unit was purchased for a past project that never happened!
SOLD AS-IS... I have never powered up the unit.
Physical condition is good.
BEST
Hello!
Current version of NTP supports Motorola Oncore and PPS. Take a look at
http://support.ntp.org/bin/view/Support/ConfiguringMotorolaOncoreRefclocks
Edésio
On Wed, Nov 26, 2014 at 11:49:59AM -0500, xaos wrote:
Hello everyone.
Currently my Stratum 1 NTP server is made up of the
Didier:
Please DO share. Thanks!
Jim
On 11/25/2014 7:47 PM, Didier Juges wrote:
Jim,
I have somewhere a piece of VB 6.0 code that decodes NMEA sentences and puts it
pretty on the screen (at least that's how I remember it :). I am not at home at
the moment but I'll be glad to send it to you
I now have my KS-24361 operating and I've successfully communicated via RS232
(using the hack described previously) with both SatStat and GPSCon using Win7.
The time I'm getting out of the unit is the GPS time (+16 seconds). I've tried
to convert the time to UTC by first changing the mode from
On 25 November 2014 at 19:51, S. Jackson via time-nuts
time-nuts@febo.com wrote:
Jim,
please remember you need proper lightning protection if you put the antenna
outside..
bye,
Said
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Sorry, seems this did not show first time.
Edésio
On Tue, Nov 25, 2014 at 09:16:20PM -0200, Edesio Costa e Silva wrote:
Hi!
Navspark has one board with Glonass
(http://navspark.mybigcommerce.com/navspark-gl-arduino-compatible-development-board-with-gps-glonass/)
and one board with Beidou
Hello All...
SELLING: EFRATOM SLCK-101 Rb Freq Std
10MHz sine out... +24VDC required
This is a very small unit measuring:
3 11/16 x 4 15/16 (5 1/2 to end of connector) x 1 1/16
Slightly bigger than a 3 x 5 filing card!!
I do not have the matching 8 pin female connector
Unit was
Hello All...
CORRECTION to the Model #... Sorry
SELLING: EFRATOM SLCR-101 Rb Freq Std
10MHz sine out... +24VDC required
This is a very small unit measuring:
3 11/16 x 4 15/16 (5 1/2 to end of connector) x 1 1/16
Slightly bigger than a 3 x 5 filing card!!
I do not have the
On Wed, Nov 26, 2014 at 10:36 AM, Edesio Costa e Silva
time-n...@tardis.net.br wrote:
Hello!
Current version of NTP supports Motorola Oncore and PPS. Take a look at
http://support.ntp.org/bin/view/Support/ConfiguringMotorolaOncoreRefclocks
Edésio
The above is certainly required reading.
yes please!
Don
On Nov 26, 2014, at 11:45 AM, Jim Sanford wb4...@wb4gcs.org wrote:
Didier:
Please DO share. Thanks!
Jim
On 11/25/2014 7:47 PM, Didier Juges wrote:
Jim,
I have somewhere a piece of VB 6.0 code that decodes NMEA sentences and puts
it pretty on the screen (at least
rob...@live.nl said:
Onother question... here in Europe was use screws and nuts with 'metric'
(mm) threat. What is used for the mounting screws, how do you call that?
6-32
Web price is $3.49 for a box of 100 at my local hardware chain.
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On Wed, Nov 26, 2014 at 11:49 AM, xaos x...@darksmile.net wrote:
Question: How do I setup NTP with a 1 PPS from serial port
and the Motorola receiver hooked up?
You'll want to review the documents at ntp.org and the list
http://lists.ntp.org/listinfo/questions.
The folks there will be happy
Said mentioned on an earlier thread that if a GPS antenna is used
outside, lightening protection should be used. This immediately
reminded me of something that happened about 10 years ago to me
1) Lightening damaged my ADSL modem. It because totally dead.
2) Every computer and a printer connected
The N2MO station has an external GPS antenna on the gable end of the
building. It's connected to the polyphaser arrestor with FSJ4-50
superflex.
The antenna mounting pipe has a #2 ground wire (33.6 mm/2) the
polyphaser has it's own #2 ground wire. Both connect to an 8' x 5/8
(2.4m x
Bruce wrote:
Almost. 1:1:2 (turns ratio) transformers used in each stage and 1:1
transformer on input. This allows a lower power supply voltage to be used.
I spent a little time (emphasis on little) fiddling with the
simulation, and I did not immediately find any solution with 1:1:2
and
On 11/26/14, 1:37 PM, Dr. David Kirkby (Kirkby Microwave Ltd) wrote:
Said mentioned on an earlier thread that if a GPS antenna is used
outside, lightening protection should be used. This immediately
reminded me of something that happened about 10 years ago to me
1) Lightening damaged my ADSL
On 11/26/14, 2:00 PM, Martin A Flynn wrote:
The N2MO station has an external GPS antenna on the gable end of the
building. It's connected to the polyphaser arrestor with FSJ4-50
superflex.
The antenna mounting pipe has a #2 ground wire (33.6 mm/2) the
polyphaser has it's own #2 ground wire.
Thanks a lot, that's a big help.
To: time-nuts@febo.com
From: hmur...@megapathdsl.net
Date: Wed, 26 Nov 2014 12:46:44 -0800
CC: hmur...@megapathdsl.net
Subject: Re: [time-nuts] Lucent KS-24361
rob...@live.nl said:
Onother question... here in Europe was use screws and nuts with
You CAN (almost) lightening proof your system. The trick is to give
lightening a low impedence path to grind at very opportunity.
Start with the antenna mast and call. Use iron pipe for the mast and feed
the antenna cable down the center of the pipe. Place two large ground
clamps on this pipe
albertson.ch...@gmail.com said:
The ground rod needs to be bonded to the rest of the building ground system.
How do I do that effectively if the power goes in the front of the building
and the antenna is on the back?
--
These are my opinions. I hate spam.
On 11/26/2014 5:14 PM, Jim Lux wrote:
On 11/26/14, 2:00 PM, Martin A Flynn wrote:
The N2MO station has an external GPS antenna on the gable end of the
building. It's connected to the polyphaser arrestor with FSJ4-50
superflex.
The antenna mounting pipe has a #2 ground wire (33.6 mm/2) the
On 26 November 2014 at 22:14, Chris Albertson albertson.ch...@gmail.com wrote:
You CAN (almost) lightening proof your system.
BUT if the almost is not quite enough, one could damage a lot of
expensive test kit.
Remember that Ethernet is always
gavalically isolated by transformers
I lost
On 11/26/2014 5:54 PM, Hal Murray wrote:
albertson.ch...@gmail.com said:
The ground rod needs to be bonded to the rest of the building ground system.
How do I do that effectively if the power goes in the front of the building
and the antenna is on the back?
If cost is no object, a ring ground
Surround your house with a complete loop of #6 wire with 8-10 ft long ground
rods every 10-12 ft (but no less than 6ft), bonded (clamped) to the ground at
the service entrance. That's the simple answer. The somewhat longer answer is
in a recent copy of the ARRL Handbook. Some will argue for
The magnetic field in the core due to the current in the windings is
proportional to current times number of turns. If there are more than one
winding, add the currents. Yes, 2 x 20mA certainly exceeds 30mA. The core
will be driven closer or into saturation and the inductance will be
On 11/26/14, 2:14 PM, Chris Albertson wrote:
You CAN (almost) lightening proof your system. The trick is to give
lightening a low impedence path to grind at very opportunity.
Start with the antenna mast and call. Use iron pipe for the mast and feed
the antenna cable down the center of the
On 11/26/14, 2:54 PM, Hal Murray wrote:
albertson.ch...@gmail.com said:
The ground rod needs to be bonded to the rest of the building ground system.
How do I do that effectively if the power goes in the front of the building
and the antenna is on the back?
AWG 6 wire with no breaks or
Here is a link to a good 12 page description of grounding
practices/requirements.
http://www.reeve.com/Documents/Articles%20Papers/AntennaSystemGroundingRequirements_Reeve.pdf
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You really do have to bond the two of them. The VERY best way is to dig a
trench all the way around the building and install a loop of wire, #8 at
least (although I use much larger wire after the time and money to dug a
trench.) This wire connects the rods and the water system. While a full
On 27 Nov 2014 01:14, Chris Albertson albertson.ch...@gmail.com wrote:
After this minimum you have th think about the probability of a strike.
If
you live in Orlando Florida then it might be 100% and nearly zero in other
places and then you ask what the radio equipment cost. I paid $18 for
Dave wrote:
The magnetic field in the core due to the current in the windings is
proportional to current times number of turns. If there are more
than one winding, add the currents. Yes, 2 x 20mA certainly exceeds
30mA. The core will be driven closer or into saturation and the
inductance
On 11/26/14, 5:23 PM, Chris Albertson wrote:
On Wed, Nov 26, 2014 at 4:03 PM, Jim Lux jim...@earthlink.net wrote:
On 11/26/14, 2:14 PM, Chris Albertson wrote:
You CAN (almost) lightening proof your system. The trick is to give
lightening a low impedence path to grind at very opportunity.
Sweet. I settled on #3 copper for my antenna grounding system on economic
grounds and had a debate with a residential electrical contractor about
bonding the antenna ground to the electrical service ground. The city
inspector passed the system with the bond installed.
I haven't used poly
In my opinion,
I'd be inclined to find a way to run a suitable wire around the building.I
don't think you want your interior electrical wiring serving as the only bond
between two different grounds if energy from a lightning strike flows thru your
antenna feed line and then thru your time
Check out the synergy m12 eval board. It's about $100 with the m12m on it
and a little less if you're going to install your own.
The most recent ftdi in-tree driver will automatically support the
adapter. Previous versions you need to echo the VPI to the sys
tree interface of the ftdi_sio
Hi
Run in common base ( with things done properly) you can get well over 60 db
isolation on a single stage.
Bob
On Nov 26, 2014, at 2:59 AM, Bruce Griffiths bruce.griffi...@xtra.co.nz
wrote:
A single 2N or equivalent transistor in a suitable circuit dissipating
about 200mW or so
Hi
I very much would not implement that circuit these days. A logic buffer based
design beats it on pretty much ever (useful) spec in the book.
Bob
On Nov 26, 2014, at 7:52 AM, Charles Steinmetz csteinm...@yandex.com wrote:
Bruce wrote:
A single 2N or equivalent transistor in a
Hi
You need a good antenna setup to get a good disciplined oscillator. The bigger
question is if you *need* the sort of “better” it gives you. If you are running
a simple TCXO based GPSDO, you will have a number of issues to deal with
compared to an OCXO or Rb based system. If “better” is an
Hi
Did the frequency shift at the same time?
If not, the first suspect would be the data collection system.
Bob
On Nov 26, 2014, at 11:00 AM, Dan Kemppainen d...@irtelemetrics.com wrote:
Hi All,
I've been playing with some double oven HP10811's. I've been monitoring the
internal oven
Hi
If you look at some of the wire that they use, the rating may be as much a wire
rating as a core rating. They use *small* wire !!!
I’ve always assumed that if you go over 30 ma anywhere on any winding you are
in trouble. I suspect that DC through the entire winding (ignoring the center
Hi
Which port are you putting the commands into?
The box *may* respond to some things on the Diag port that it does not respond
to on the PPS port. I have not investigated this, but it is a possibility.
Bob
On Nov 26, 2014, at 12:52 PM, Mitchell Janoff majan...@verizon.net wrote:
I now
Hi Bob,
Yeah it did. This is running as part of one of Bob Stewart's GPSDO's.
It's been up for about two weeks now. The log indicated there was a
phase jump compared to the GPS PPS input. EFC made a jump to correct
for it. A few hours later, it made a small jump back in the other
Hi
The thing that looks like a second oven on that unit really is not one it is a
boost heater. It should be off under normal conditions.
Assuming it is off, it is not the problem.
Next thing to check is the input power.
Bob
Sent from my iPhone
On Nov 26, 2014, at 9:53 PM,
Here are two sources of grounding and other information.
The Moto R56 is 518 pages of grounding and equipment protection info.
https://www.dropbox.com/s/f3xjx1u15ipys26/Motorola_R56_2005_manual.pdf
http://wiki.radioreference.com/index.php/RF_Engineering
Regards, John K1AE
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