On 26 November 2012 15:44, Peter G. Viscarola pete...@osr.com wrote:
Hi TimeNuts,
What are people using for surge arresters between your GPS receiver and the
antenna, at the entrance to your house?
Several years ago there was lightning near my house, which I think
went on the telephone
On 27 November 2012 09:15, David Kirkby david.kir...@onetel.net wrote:
If I was reallly concerned, then I'd look at using an optical
interace. Use a battery to power the GPS antenna, modulate a laser and
detect the RF on a photodiode connected by a metre of so of optical
fibre.
Of course, I
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.
I got this guy to add
Bruce Griffiths schrieb:
Richard (Rick) Karlquist wrote:
On 11/23/2012 9:38 AM, Bruce Griffiths wrote:
NIST have shown (at least at 10MHz) that the high level mixers they
tested are noisier than the ZRPD1.
Bruce
Do you have a citation to where they said that?
What you quoted doesn't make
Bruce Griffiths schrieb:
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
Adrian wrote:
Bruce Griffiths schrieb:
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
Bruce Griffiths schrieb:
Adrian wrote:
Bruce Griffiths schrieb:
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
Bruce,
There's no evidence of a cross power spectrum function in this suite.
One needs to be able to average at least 10,000 cross power spectra for some
applications.
In the PSD (power density) PSP (power spectrum) there are cross power and
cross
power complex average implemented
Adrian wrote:
Bruce Griffiths schrieb:
Adrian wrote:
Bruce Griffiths schrieb:
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
Support HpW-Works.com wrote:
Bruce,
There's no evidence of a cross power spectrum function in this suite.
One needs to be able to average at least 10,000 cross power spectra for some
applications.
In the PSD (power density) PSP (power spectrum) there are cross power and
cross
Bruce Griffiths schrieb:
Support HpW-Works.com wrote:
Bruce,
There's no evidence of a cross power spectrum function in this suite.
One needs to be able to average at least 10,000 cross power spectra
for some
applications.
In the PSD (power density) PSP (power spectrum) there are cross
27/11/2012 14:18
I bought a 18GHz EIP545A counter which the vendor said was working
fine the day before and when on overnight soak test, and also when
last used some months agao. But when he checked it on the morning of
my coming over to see it he found it had developed a fault... I bought
it
Said, I agree with all you say. My web page does not intend to show what is
best, simply what is. Many people are puzzled by the issues of line impedance.
Best practices have been discussed at length on this list, but always
theoretically. I thought a few scope pictures and explanations would
The first thing to do with any EIP counter is to remove and reseat all the
PCBs. The card sockets they use are sometimes flaky. Simply doing this
fixed most of the counters. This is especially true if they have been
storfed for a while.
YMMV,
-John
===
27/11/2012 14:18
This one is usually an easy fix. The EPROMS on the controller
card are using tin plated sockets, and they become tin-whisker
cities. The counter will usually have enough oomph to blow any
transient whiskers away if it is left running, but if it sits
the whiskers will grow quickly and prevent
Not that it's likely to help you, but a signature analyzer uses a shift
register with feedback to generate a 4 hex character signature from a
serial data stream. It would only help if the troubleshooting tree includes
a list a bad signatures for specific failures.
It is also used to check ROMs and RAMs for good data.
The service manual will often contain 'signatures' for each pinout of a device,
as it runs through a set, respective routine. Specific start, stop, and clock
signals are defined in the service manual.
A very valuable tool. I have a
EIP was like many smaller TM companies, they by virtue of the size of
lack of the desire to research component, manufacturing, life cycle testing,
TQM, etc, etc. produced great instruments the day they were made. After
that things went down hill. BTW, the big boys would forget all the above
from
While NPT (US) and BSPT (UK) are different, 1/2 and 3/4 variants are
both 14 threads per inch and are similar enough to intermate, but are
unlikely to seal. Since sealing is not a requirement here it ought to
be good enough.
Failing that, maybe one of our members on the continent would send you
You really can't protect yourself from a direct strike. But that is rare.
More common is a close strike.
You first line of defense is to ground the metal mast (pipe). Place a
ground clamp on the pipe and run a large ground write by the most direct
route to a ground rod driven into the soil.
Hi Chris,
The first thing you should do is join the EIP_Microwave group at yahoo:
http://tech.groups.yahoo.com/group/EIP_Microwave
There's lots of info and help there for EIP counters.
Don't worry about the signature analyzer for now. It would normally be
used if the processor was dead.
I followed your argument and tried to synthesize such a signal. I built
a simple power combiner (3 times 18 ohms resistors) and combined the 10
MHz reference output of my signal generator with a 5 MHz signal from the
same generators regular output at the same amplitude. My oscilloscope
snip
I'm in the same position as you regarding testing at high frequencies.
You might be able to get a signal at the second or third harmonic of
your generator by cranking the level to the maximum and then using the
counter's Band 3 frequency limits feature to only look at that
frequency.
Hi
Phase does indeed matter, it just messes up the math. Most multiplier /
filter combinations have significant phase shift between the sub-harmonic
and the carrier. You rarely know what the phase shift is, but you can read
the sub-harmonic. The simple db to jitter ratio gets you close enough to
Hi Don,
Yes, I've heard of SRDs. I think every Rb standard uses them. I
recently purchased a YIG Multiplier that includes an SRD followed by a
YIG filter. But, from my reading, there are some significant issues
that you run into when driving an SRD. I'm still playing with mine.
Ed
On
You can also overdrive a mmic and get good results. That is what I'm using as
the oscillator for my 1.296 GHz beacon.
Bob
On Nov 27, 2012, at 15:45, Ed Palmer ed_pal...@sasktel.net wrote:
Hi Don,
Yes, I've heard of SRDs. I think every Rb standard uses them. I recently
purchased a YIG
Hi Ed: I have one of these too; it takes in about 200 MHz, output
0.4-1.8 GHz. ten ohm coil, also a heater at 28 v. I also have a filter
that uses about the same voltage/current. I did find an LED/battery
charger module from China, pretty cheap, that purports to be pwm
adjustable; we'll see. I'll
Hi Chris,
The first thing you should do is join the EIP_Microwave group at yahoo:
http://tech.groups.yahoo.com/group/EIP_Microwave
There's lots of info and help there for EIP counters.
Don't worry about the signature analyzer for now. It would normally be
used if the processor was
Very interesting indeed. Two questions: after adding the 66nS phase shift,
were the two peaks at 66nS when at the same amplitude? Then, while reducing
the amplitude of the 5MHz, were they getting closer (until the 240pS)?
On Tue, Nov 27, 2012 at 9:21 PM, Bob Camp li...@rtty.us wrote:
Hi
Phase
Now, that you ask: the measurements are in that range, yes, though it's
not exactly the values.
time shift 12ns - spacing 10ns
28ns35ns
66ns55ns
0ns 8ns
and yes, the peaks get closer while reducing the amplitude of the
Boy great thread running here. I have a number of older EIPs that all work
and have been repaired. Hard to pass up the $25ers. I also have several
newer ones 545 and 585s. EIP became a bit more clever on these in how they
process the YIG signals and thats the place I am having issues on all 3.
Its
Greetings!
I just joined the list a few hours ago and you have already peeked
my interest in this aside:
On Tuesday, 27 November 2012, Volker Esper wrote:
Though the SR620 TIC is a great instrument when hunting the pico seconds
we have to realize, that it's a thermal design desaster (I have
Chris,
Put a ohmmeter across any of the capacitors on the GPIB board and see what
the resistance is. Since that kills the unit, I suspect the resistance is
low (?shorted tantalum) or there is a problem with one of the chips that
takes the 5 VDC buss down. Make sure of the polarity of your DMM,
You might get better answers by starting a new thread rather than hiding your
question in an existing thread. (Use your New message button rather than
Reply, and cut-paste the To address from an old message, then type in the new
Subject.)
Using a useful Subject also helps people find things
34 matches
Mail list logo
