This is actually pretty interesting to me. The questions of how to choose
an RTOS and how to handle power management seem to be relevant engineering
topics when discussing the 5370 processor boards. It's not an academic
question in the professional world, where certain instruments I won't name
Your main concern will be injection locking, followed by the additive noise
of the buffer amps that you use to prevent it. The CMOS output buffers in
the oscillators themselves may provide enough isolation, but don't count on
it. Injection locking is easy to spot with a scope. You can adjust
With newer HP/Agilent cards like the 82357A/B, you can enable NI488.2
compatibility in the Agilent I/O Libraries package. Not sure if that can be
done with an 82350B, though... let me know if you try it!
-- john, KE5FX
Miles Design LLC
-Original Message-
From:
the instrument would allow you to choose
the estimator... but look at all of the stuff the user would have to read in
order to understand how to use the feature. :)
-- john
Miles Design LLC
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of br
I usually don't use drift removal as I want to see the effects of drift!
The effects of oscillators locking together are very apparent on both the
phase and AD plots when using a DMTD system. There was no indications of
such locking!
My point was that if you are measuring ultrastable
This is indeed terrible to hear. Ulrich's free software contributions were
not only valuable in my work but useful to a lot of other people with test
gear. He was also one of my first customers, putting a lot of faith in a
guy he'd never met who was selling PN analyzers out of his basement in
Are you using the normal marker or the frequency counter marker? The
counter marker should be accurate, while the frequency displayed for the
normal marker position will not be. You may be able to improve the normal
marker's accuracy in narrow spans if you run the shift-W self-calibration
All that said, the real hazard with transformers is that people tend to
use
them to drive unbalanced coax cables with balanced signals. This turns
the
coax shield into an antenna, at which point you may end up with with
more
noise and spurs than you had before.
Could you explain this a
and I post a
screen shot at htpp://www.gatesgarth.com/heather_error.jpg
Is there an e-mail address for John Miles I might send it to if no one
knows what it means? thanks
03/08/2014 18:37
Typo, that should of course have been :
http://www.gatesgarth.com/heather_error.jpg apologies
Looks like a really nice piece of hardware, well worth fixing up. You might
check the hot-wire ionizer filament on the Cs tube for continuity, as a failure
there may not show up in a meter indication.
Apart from that, the detailed troubleshooting steps in the contemporary HP Cs
service
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of David
McGaw
Sent: Wednesday, September 03, 2014 8:01 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] 10811 Thermal fuse?
Actually, in the unit in which the
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Dr. David
Kirkby (Kirkby Microwave Ltd)
...
If I recall correctly, when I did look some time ago at getting
another TI counter, the Agilent 53230A seemed to have some
specifications *worst* than the
Out of curiosity, what's the difference between the two first traces?
One looks more jump than the other.
These are all factory new OCXOs (in this case, they're TimePod spare parts
undergoing incoming test before I put them on the shelf). The 1303-series
parts both exhibited a small jump at
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Tom Van
Baak
I have several SR620 and HP5370 in my lab. My preference has always been the
SR620; by size, features, front panel, calibration, programming. But both
counters do the job so if you can
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Camp
For what ever reason, HP sold the 5370 as a “time instrument” and discouraged
it’s use as a “frequency instrument”. I have absolutely no idea why. That’s
certainly the way the local sales
I'm not familiar with the 10811-60212 variant, but I have a -60168 single oven
part whose 6-pin connector is wired like this:
BLK Gnd
RED Oscillator power +11.5-13V
BLK Gnd
YEL Oven monitor
GRN Oven power +20-30V
BLU Oven ground
The coax connectors are probably SMB
Great insight thanks. You nailed it: out with the old oscillator and in with
one
that doesn't have that problem.
Btw the mechanical tuning issue you mentioned is essentially the same exact
problem: even the slightest turn will make the frequency jump too high or too
low. It can drive you
Can I have your recommendation regarding a choice of 10 MHz rubidium source
(available now on eBay like FE-5680; LPRO-101; LPFRS; FRS etc.) as a
reference signal for my frequency counter Pendulum CNT-91.
You might take a look at the plots at http://www.ke5fx.com/rb.htm if you
haven't
I know what your next question will be, I see that these rubidium
oscillators all can be adjusted over a range that falls on both sides of
10MHz. What should I use as a calibration source to adjust my rubidium
oscillator? Then you think If I have this 10MHz calibration source, why
not just
Charles,
Thanks a lot for the detailed explanation and recipes. Understood and will
check this weekend.
All my Morion 10MHz MV89A OCXOs are used and from eBay's. That's why the
first version of broken surplus MV89A looks realistic.
Best regards,
Karen
Don't forget to hit 'f' and/or 'p' to
Assuming that the test above (with the external REF) gives similar
results to what you posted today, there is something wrong with your
measurement setup. Are the input signals triggering the counter very
stably near the middle of their peak-to-peak voltages? Is the
counter adjusted to give
It seems to me that it's just a case of expecting too much from a counter.
Possibly, but a well-tuned 5370B can get to the low e-12's at 1-10
seconds.
You can get down there with TI averaging, but the data you get is not ideal
since the averaging process smooths out the very instabilities
Mode has been switch from Frequency to TI - result is much better now. It was
the main improvement in my measurement. Thanks a lot!
Picture of ADEV OCXO result -
https://dl.dropboxusercontent.com/u/21338179/hamradio/OCXO_Adev/OCXO%
20ADEV%20TI%20mode%2020141102.jpg
If you're taking a
Yes, but your Q will suffer.
Ok, so it might / might not work depending on how high a Q it needs to start
functioning. I think I might try it before I went crazy coating he bulb.
There will
be a *lot* of weird things to debug and associated tear downs to find them.
Having a fragile
The software for these gizmos dates back to Windows for Workgroups 3.11.
That’s a way back. Even getting it running on Windows 95 was a bit of a
problem. The biggest issue is that it was hand optimized for some of the
timeout delays.
If you bring it up, what you want is an old / slow PC
There's a good chance you can get it working but not necessarily with the
built-in ion pump supply. In my experience, if it doesn't pump down within a
day or two, it never will. No point waiting multiple days or weeks. The
manual talks about how to connect an external HV power supply, and I
If you get the tube working, you should use a counter or Lissajous display
with a GPS or rubidium standard to preset it to the correct resonance peak
frequency for lockup. The tube will probably be pretty noisy at first. If
it also has weak beam current, which is common, it will be very
Hi Said,
do you have any information about how that TimePod 5330A works any
principal description?
73
KJ6UHN
Alex
Here's the manual:
http://www.miles.io/TimePod_5330A_user_manual.pdf
These days, it's manufactured and sold by Microsemi as the 3120A Phase Noise
Test Probe. Microsemi
Also, I think John's TimePod user manual probably has a description of it.
Otherwise I remember Sam Stein (who is behind the TSC units) had some PTTI
or similar presentations discussing the technology, but I don't know where
those could be downloaded.
I have a large (if debatably organized)
I bought a couple of 5071As on eBay recently, on the basis that the various
status messages shown in the auctions didn't look like tube failures. They
both reported Cs oven voltages at 0.0.
The first unit turned out to have a severe intermittent noise problem,
originating somewhere other than
That's extremely interesting, Adrian. I've never heard of a noisy varactor,
but then I've never looked for one, either. It'd be great if some of the
problems that have been blamed on jumping crystals were in fact caused by
the tuning diode. What steps did you take to rule out the crystal and
ADEV fidelity you'd want to use TI measurements rather than
frequency measurements, but frequency measurements are obviously much easier
to set up. They can give you a good overall idea of what's going on.
-- john
Miles Design LLC
-Original Message-
From: time-nuts-boun...@febo.com
. Fortunately the LEA-6H's USB output worked great when I added
the cable.
-- john
Miles Design LLC
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-
boun...@febo.com] On Behalf Of Bob Camp
Sent: Thursday, November 15, 2012 4:10 PM
To: Discussion of precise time
Thanks, guys! Sorry about the price increase, that wasn't my doing. :)
-- john, KE5FX
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-
boun...@febo.com] On Behalf Of Tom Knox
Sent: Saturday, December 01, 2012 4:33 PM
To: Time-Nuts
Subject: Re: [time-nuts]
an analog quadrature PLL.
-- john
Miles Design LLC
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-
boun...@febo.com] On Behalf Of Adrian
Sent: Wednesday, December 05, 2012 4:40 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts
Neat data set! This says a lot about the stability of your HP supply. The
choice of current-sense element makes a big difference in a YIG driver
circuit, and most wirewound resistors fall into the Don't ask category.
Would be interesting to try the same test with one of the cheap Chinese
Hi, Luciano --
The sampling interval would be whatever rate the counter is returning
readings, as usual. I usually let the acquisition driver estimate the rate,
unless I know it's exactly one reading per second.
In frequency mode, the scale factor should be 1E-6. You need the program
to treat
not see the info you refered to?
Here's a direct link to the attachment:
http://www.ke5fx.com/5065a.png
-- john
Miles Design LLC
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of an intermediate solution, aimed at being as simple as possible while
still being useful in real-world programs.
(Run GPS.EXE without any options to see the current usage notes.)
-- john
Miles Design LLC
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-
boun
, and Enrico
Rubiola's book/website.
-- john
Miles Design LLC
On Sun, Dec 30, 2012 at 10:44 AM, Bruce Griffiths
bruce.griffi...@xtra.co.nz wrote:
Tom Knox wrote:
Dual oscillators in Cross Correlated
measurements will also produce a 3dB theoretical reduction in a Phase
Noise
can indeed use a pair of $10 TCXOs as references to measure
arbitrarily low-noise DUTs, but you may need to run the measurement for days
or weeks. Measurement time is the price of the free lunch in this case.
-- john
Miles Design LLC
___
time-nuts
://cp.literature.agilent.com/litweb/pdf/N9068-90005.pdf , for example.
-- john
Miles Design LLC
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-
boun...@febo.com] On Behalf Of Azelio Boriani
Sent: Monday, January 14, 2013 7:33 AM
To: Discussion of precise time
, just the resulting
noise.
-- john
Miles Design LLC
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and follow the instructions there.
Tom,
On 02/13/2013 05:04 AM, Tom Van Baak wrote:
Magnus,
Two things to check.
1) Is the bump you see at all correlated to the relative frequency
between
the two oscillators? I have seen this when comparing two ULN, for example.
You can make the bump move left or right depending on
I'm not sure about the Racal, but the HP 5345A can be placed into talk-only
mode and used to stream readings to TimeLab in Acquire-Acquire from
counter in talk-only mode . JohnA's link is the right one to use.
The advantage to trying it with the HP 5345A is that I have one around here,
so I can
Sounds like a bad OCXO. The crystal frequency jumps slightly, and the
disciplining loop then has to compensate by steering the DAC voltage
through the loop filter. If that's the problem it may get better if you
leave it running for a few more weeks.
The smoking gun is the attack/decay
I do like the strain reliefs on the Pomona cables, but the cables themselves
are leaky as expected. A couple of points:
1) If you don't have any other signal sources in your environment that are
close to your measurement frequency but not coherent with it, you'll
probably be OK with
It was my impression that the Symmetricom device and the Miles device
were identical in performance / capabilities. The issue with the
Symmetricom device is that you unlock features on a cost per feature
basis. If there are other capability limits past that, that's very bad
news.
The sub-1
With most modern lightweight Rb's the OCXO is integrated into the same
heater block as the physics package. That makes it a bit tough to heat one
without heating the other. .
On LPROs the OCXO sits on the opposite side of the board.
Pretty sure that's not an OCXO. If it is, it's a tiny
It has caused a lot of confusion, admittedly. That's why, in the more
recent releases, I changed the label on the icon to KE5FX TBolt (Seattle,
USA). But it seems that's still not enough of a hint, because people still
write me from various countries asking why their Thunderbolt's location is
Hi, Tom --
A paper in the 2010 EFTF described the use of a pair of 11848A boxes from
the 3048A system, which is similar to the E5500 hardware (
http://www.congrex.nl/EFTF_Proceedings/Papers/Session_14_Oscillators_and_Noi
se/14_04_Bale.pdf ). You could ping those authors if you haven't already.
Oops, sorry, I read 70820 for 70420, disregard that last link.
-- john, KE5FX
Miles Design LLC
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-
boun...@febo.com] On Behalf Of John Miles
Sent: Saturday, March 30, 2013 4:10 PM
To: 'Discussion of precise time
I guess I'll forgo the pleasures of WIN7 and stick with my XP Laptop.
Maybe some day it will different.
It'll work fine under Window 7 and 8 (I use Windows 7 x64 to develop, while
my LH monitor is an older laptop with Win2K.)
BTW, I tried a Beta version of Lady Heather, when I try to expand
.
-- john, KE5FX
Miles Design LLC
-Original Message-
From: John Miles [mailto:jmi...@pop.net]
Sent: Sunday, April 21, 2013 12:14 PM
To: 'Discussion of precise time and frequency measurement'
Subject: RE: [time-nuts] T-Bolt Mon and Windows 7
I guess I'll forgo the pleasures of WIN7
Very nice bit of RD work on Corby's part. Mine is certainly working well
after the modification, but I'm just blown away at the performance seen with
Tom's unit.
Another plot of the Super mod that's worth mentioning:
http://www.ke5fx.com/5065A_vs_maser_mask.png
Below 1000 seconds it has no
Close, but it's for the 105, not the 5061, and the boards are physically very
different.
The 5061A upgrade used those 105-series boards. With the 5061B, they changed
the part number of A1A3 (the OCXO interface board) from 00105-6044 to
05061-6198, but I don't see any major differences in the
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Mark C. Stephens
Sent: Thursday, May 02, 2013 9:29 PM
To: li...@lazygranch.com; Discussion of precise time and frequency
measurement
Subject: Re: [time-nuts] Measuring Phase
As JohnA says there's no hard limit on the duration for phase data logging,
other than available RAM. She would definitely want to use a 64-bit PC for
this. The TSC 5120A cranks out phase data at 1000 samples per second by
default, so even a well-endowed 64 bit PC will run out of memory when
Yes, those messages are just there to warn users that if they try to record
multi-million point phase records, they may either run out of memory or
generate a gigabyte+ file that will be painfully slow to work with. The
warning threshold is quite a bit higher in the 64-bit version but it will
That gets you to the question - just how good do you think the 1
second AVAR
is on the existing oscillator, independent of the TBolt environment?
If for instance you have a 2.5x10^-12 OCXO in yours, you would only see a
significant improvement with a sub 1.0x10^-12 OCXO. That sort of
limitation, Baudline looks like it's got
what I need.
Bob
On Feb 18, 2010, at 7:53 PM, John Miles wrote:
Unfortunately there's no way to build a sound-card application that can
measure phase noise in the general case without a lot of additional
hardware. Baseband PN analysis with an FFT
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]on
Behalf Of Bob Camp
Sent: Thursday, February 18, 2010 5:26 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Sound Card Spectrum Analyzer
Hi
I've used
] Sound Card Spectrum Analyzer
Hi
Hey - that sounds like one I can't pass up.
Sign me up
Bob
On Feb 18, 2010, at 8:36 PM, John Miles wrote:
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]on
Behalf Of Bob Camp
Sent: Thursday
Previously there was some confusion and disagreement on the subject.
What are the latest opinions?
The white noise which is the only dominant noise at higher frequencies
goes down into the lower range and do contribute to the ADEV measures
there, even if filtered.
Well, in which case
I have been thinking about how to make the measurement. I don't
normally measure OCXO phase noise. I buy them to spec and lock
my synthesizer to them, measuring phase noise at microwave
frequencies using an older Agilent E5500 system with an 8254 (?)
signal generator reference, which is an
I remember we've had one in the company where I was working back then.
It was ok for TV and similar stuff.
The frequency stability was not really great, but what can you expect
from a free running 1st LO?
The drift was specified 50 kHz / 5 min after 2 hours warmup and 5
minutes after
There is no qualitative difference between the physics of a 5062C and
5061A/B. They both use the (3,0) to (4,0) transition. For whatever reason,
the C-field is set for a Zeeman separation of 40-50 kHz in the 5061 and 70
kHz in the 5062.
The effect of the different magnetic bias levels is slight
-178 is about the same broadband floor that you see from the higher-end
Wenzel ULN parts. These can be custom-ordered in the $2000-$2500 range in
single quantities. Pascall's product line seems relatively similar.
Obviously the carrier needs to be over +4 dBm to get to -178 dBc/Hz at 25C,
but it
Hi, Garry --
I knew from other people's measurements that 74AC was capable of better
than -160dBc/Hz when used to make a phase detector at 10MHz, but I
wanted to do a quick feasibility check on a divider for an application a
couple of years ago.
The 74AC163 was powered from a linear bench
I think the best policy re: initial setup of the 5061A is to follow the
manual. There are clear instructions on how to set the beam current and
second harmonic indications and tune the OCXO to find the central peak. If
it is locked but not exactly at 5 MHz, either your C-field is grossly off,
or
What threshold are you using? If you leave it set to preset/0 volts, you
may find that crosstalk between outputs on the TADD-2 cause false
triggering. I usually use the divide-by-10 setting with the threshold set
to about 0.25V.
It also helps to remove the jumpers from any outputs on the TADD-2
settings with the
TADD-2?
Dave
On Sun, Feb 28, 2010 at 7:42 PM, John Miles jmi...@pop.net wrote:
What threshold are you using? If you leave it set to preset/0
volts, you
may find that crosstalk between outputs on the TADD-2 cause false
triggering. I usually use the divide-by-10 setting
I haven't exhaustively tested the ADF4107 but I have played with the ADF4002
recently. I haven't been able to come within several dBc/Hz of its rated
noise level. In one test, at 100 Hz from an 80 MHz carrier, I've seen
about -118 dBc/Hz from the ADF4002 when fed by 10 MHz with -145 dBc/Hz at
The display rate pots is particularly useless. You can just
hardwire it to max.
The only case I've seen where that's an issue is when using the counter over
GPIB, free running in talk-only mode. If I run it with the Prologix
Ethernet adapter, which turns each reading into its own TCP/IP
It should be good to go right away, if working properly.
If it were measuring an independent 10 MHz source at 99.998xxx MHz I would
suspect the thermal fuse in the 10811.. but if it's measuring its own
reference, I'm not immediately sure what would be up with that. It would be
time to start
That's a common question; rest assured you are not alone in your confusion.
One of us -- Mark or myself or some other doughty volunteer -- *will*
eventually write a user guide of some sort... but the software itself is
still undergoing too many tweaks. It's a bit too soon to nail down the UI
by
from my limited understanding of things I would have guessed that the
ADF4001/2 PFD's ability to produce very short pulses in the
locked condition
puts a lot of energy into higher harmonics of the PFD's output, making it
more easy for the loop filter to remove them. In contrast to that
the
Many if not most 5370-based measurements are based on differential timing
between the START and STOP channels, and wouldn't benefit from a better 10
MHz reference. If a customer did need something better, they probably
already had a house standard to pipe in the back... and if not, HP would
have
There isn't an 'official' .sln one at this time, but you can just run nmake
in the c:\program files\heather directory if you're set up to compile from a
DOS prompt.
No special compile/link options are needed so you can probably just add the
source files to a VS project and let it do its thing
I'm trying some new network code in the LH 3.00 beta client and server, and
it looks like a user in or near Wolfdale, Ontario on the rogers.com network
is having some timeout issues with the server. If you are that lucky user,
could you drop me a line off-list at jmi...@pop.net when you have the
Actually an HP 5065A in good condition is adequate to characterize the best
GPSDOs beyond t=10s or so (see green trace). 5065As aren't that much
noisier than passive masers until you get past t=1000 seconds!
On the other hand, a telecom-grade rubidium is nowhere near good enough for
GPSDO
This is my first Allan Deviation plot. It consists of the PPS
output of an Oncore GT+ (Navigation-grade) GPS vs. an Ovenaire
10MHz OCXO divided down to 1Hz via an HP 5328A counter. The HP
5370A is free running on its 10811-60101 OCXO. The
control/plotting is done by KE5FX's T.I. utility
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]on
Behalf Of Bert, VE2ZAZ
Sent: Tuesday, March 16, 2010 6:37 AM
To: time-nuts@febo.com
Subject: Re: [time-nuts] A first MDEV plot...
OK, thanks Bruce.
The sample size is actually 28800
temperature is not entirely unexpected at =1K seconds.
I agree that the scaling looks a bit strange, but I'm ignoring
that for now.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of John Miles
Sent: Tuesday, March 16, 2010 9:41 AM
That won't work as one of the sources is the PPS output from an Oncore
GT which has a PPS error spec 500ns with SA on.
Whilst it may be a little lower without SA, it may be still be somewhat
greater than 100ns.
Dividing the 10MHz down to 1MHz or perhaps 100kHz would be better.
The 5370A
Phase wraps are removed automatically by TI (as long as you tell it what
frequency your input data is at). It's usually pretty obvious if something
goes wrong with the phase-unwrapping process, as you'll see one or more
large jumps in both the unwrapped-phase and ADEV plots.
-- john, KE5FX
I would tend to say that the divider is pretty lousy for short
term, but it is all fine for longer runs, right?
Is this what I should expect from a TTL/ECL divider chain
designed in the '70s-'80s? How would this compare to a modern
divider chain, like the PIC divider or David Partridge's
OK, so I tried this myself. A sloppy setup but never the less... The
CNT-90 time-base output via a T-connection on B-channel and then over to
the A input of the HP 5328, selected START A and then the T.B. OUT over
to CNT-90 channel A. At 100 kHz setting on the HP 5328, the TI A-B
measurement
One big favor you can do your 5065A is to check the ESR of the electrolytics
on the A11 oven driver board. C23 and C24 were open on mine, as was the
other instance of the same 20 uF cap on the battery-charger board, and the
lamp driver assembly had experienced overheating to a point that was
it working again for a couple of years. Then something else failed.
I'd sure like to fix it, but Scott McGrath, representing himself as an
employee of Harvard University, borrowed my manual more than a year ago,
and refuses to return it. Oh well!
-Chuck Harris
John Miles wrote:
One big favor you
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]on
Behalf Of Bob Voelker
Sent: Sunday, March 21, 2010 1:59 PM
To: time-nuts@febo.com
Subject: [time-nuts] HP 5065A performance vs. others
As several postings have indicated, the performance of
When in Las Cruces, go to Ranchway on Valley Drive (just south of
Picacho). It is my favorite Mexican food restaurant. Their chile is
not hot. They have a wide menu selection (including a few
non-traditional items) and good prices. They also have excellent
barbecue. It's a nice little family
I'd vote SMA. TNC isn't widely used on other HP/Agilent gear.
-- john, KE5FX
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]on
Behalf Of Samuel DEMEULEMEESTER
Sent: Thursday, March 25, 2010 2:02 PM
To: 'Discussion of precise time and
RFMD seems to produce some nice MMIC, for example the NBB-300
(http://www.rfmd.com/CS/Documents/Nbb-300.pdf), but I never used a RFMD
amplifier. I used Agilent/Avago MMIC since years with great results, but
always with frequencies no more than 3 GHz.
Anyone have some experience with DC-8/12
Thank you for getting this discussion back to technical aspects
related our
real quest for technical information.
Please look in your actual documentation for the current model 5125 and
confirm its actual specs. I had read some specs on the
Symmetricom website
but I do not know for which
Testing this at much less than -120dBc at 1KHz is not easy, since
I need a
phase noise analyzer that takes more than 30 seconds to give
results for a
measurement. So tapping with a hammer etc won't work.
But I will try using my 8561E spectrum analyzer, maybe that will pick up
the tapping
Looking for one or more of these (obsolete) DAQ adapters. Anyone got any
spares?
-- john, KE5FX
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It's not really the mixer's fault -- there are a couple of other things to
keep in mind with the 11729. The most important is that you can't measure
10 MHz sources with it unless you install an LPF in front of the LNA,
something with a cutoff on the order of 1-2 MHz. At 10 MHz and below, the
USB
John,
I'd say you nailed it.
After some more testing, I can confirm that the limiter amp and the LPF
are the culprit.
I opened the box and plugged directly into the mixer LO port.
And, for the LPF, as a quick 'n dirty solution, I connected the 1 MHz
front panel output with the LNA input.
the 10811A's some 5 dB above that.
Adrian
John Miles schrieb:
John,
I'd say you nailed it.
After some more testing, I can confirm that the limiter amp and the LPF
are the culprit.
I opened the box and plugged directly into the mixer LO port.
And, for the LPF, as a quick 'n dirty solution
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