Burt wrote:
In a sense you could say that Paul's circuit does get the WWVB
signal to the receiver - it's just a new phase stable version of the
signal signal. This way I don't have to mess with the insides of the 8170.
Note that the 1 MHz TTL signal on the rear panel of the 8170 will not
I received this all jumbled up in one long line without any sort of
formatting, because the sender's mail client does not use
standardized structure -- so I don't know who wrote what:
A 74HC4046 can reach 19.2 MHz
Be very careful about specs like that and be sure to read all the
fine
Simon wrote:
The NXP 9046 is speced for zero dead zone.
center frequency up to 17 MHz (typical) at VCC= 5.5 V
Yes, that is what my message said:
The 74HCT9046 may be a better choice (no dead zone), but
you may need to select parts to run them at 19+ MHz.
Did you read it before
Luciano wrote:
About the HP5370 please got o see my solution
The fans would cool the transistors better if they were blowing on
the heatsink fins, not directly at the transistors.
I use a slow fan that is large enough to blow over the whole heatsink
assembly. You can't hear it over the
Attila wrote:
Hi, I'm looking for an old french diseration,
which doesn't seem to be available
electronically (at least i couldn't find it
anywhere) and none of the libraries in
switzerland seem to have it. Unfortunately, the
author died a year ago, so i cannot contact him
directly
Joe wrote:
In a slightly different direction, are there any commercially available 'PSK
Compliant Atomic Clocks' out there for those of us used to looking at the
'correct time'?
Also, what, exactly, was the advantage of changing modulation formats? That
'killed' all the existing 'Atomic
Probably not a good choice for 10MHz distribution. It's an NTSC
composite video DA. NTSC composite video is relatively low
bandwidth, typicaly 5MHz or so. Without complete specs in this DA,
you can't rely on it having sufficient bandwidth, even for a 10MHz
sine wave; certainly not
I think I have a acquaintance in USA that can maybe help but the
shipping is going to kill me to death..
More so than buying a bunch of never-ending projects?
One question -- it seemed that you had gotten to a place where the
(one of the?) 9390(s) seemed to be more or less working, but the
David wrote:
I hadn't thought about the uA739 for a while. It was one of the
original low-noise amps - we used to use it for phono preamps.
If you could live with the anemic output drive, they were great
opamps for the time. I preferred the 749, which had an
open-collector output (no 5k
Bob wrote:
At least the way I read the pdf's NIST seems to
believe that GPS is legally traceable to NIST.
It is the same measure and then look up the
data sort of thing that LORAN used to
be. Took a while to read through them all
Yes, that is correct.
Magnus wrote:
However, just
Jim wrote:
If I receive WWV, and measure it appropriately, can I say that my
time, accurate to 1 second, is traceable to NIST, since they
broadcast it quite accurately, and I can bound the uncertainty
contribution from the propagation and electronics to less than a second.
That is, NIST
Scott wrote:
How are those of you dealing with traceability in the commercial space
The topic is known as legal metrology. Start here:
http://www.nist.gov/traceability/nist_traceability_policy_external.cfm
You need to click through lots of links to get the whole picture. I
believe the
I wanted to take this opportunity to thank everyone who has
contributed so much wisdom on this and the other two microcontroller
threads. The last time I personally designed with uCs was 25+ years
ago. Much has changed, and you have given me lots to think about!
Of course, there was no
On another thread, Bob wrote:
If the objective is to complete a very simple, low powered project
and be done with it, go with the Arduino. If the objective is to
learn an empire, be very careful about which empire you pick. The
ARM boys are quickly gobbling up a lot of territory that once was
What I have been referring to as the plain ADA 6 is properly known
as the ADA 6 Component:
www.extron.com/download/files/userman/ADA6ComponentB.pdf
Judging from the dates on some of Extron's documents, it appears to
be a newer model than the ADA 6 300 series -- which is consistent
with
Fred wrote:
I tried making small incremental adjustments but after I am done,
the frequency drifts several Hz and then re-stabilizes at a new value.
That is to be expected. Adjusting an oscillator is an iterative
process. After a while, you should get a feel for how far it drifts
after
One further thought: You say it drifts several Hz -- that seems like
quite a lot, if you are making small adjustments. I'd expect perhaps
several tens of mHz at most, although if it was way off when you
started, Hz might be possible at the first iteration. I suspect you
have a mechanical
Gordon wrote:
Can you advise where one might obtain a copy of the Bill Feldman users guide
for the HP 3586B SLV? I have one of these units and need all of the help I
can get. Is it available as a PDF anywhere?
It is posted on the BAMA site:
Brooke wrote:
There are a number of paragraphs with the same number and Appendix C
is missing all the schematics.
The original was edited by a third party (including in particular the
paragraph headers) around the time that Mr. Feldmann died. I do not
believe any important content is
Russ wrote:
The HP 5334B has a 1k Ohm input impedance shunted by 20 pf it
wouldn't hurt to terminate this input
This is pretty typical for reference inputs on test equipment. The
idea is that one 50 ohm source can feed a number of instruments using
nothing but a series of Tee connectors,
Brooke wrote:
I'm trying to learn more about the HP Z3805A GPSDO.
http://www.prc68.com/I/Z3805A.html
It has an OCXO that I haven't seen before with a paper sticker with
it's p/n: 3505A09422
The A normally means made in America.
Check the output on a spectrum analyzer for 5 MHz content.
Mark wrote:
For the first 6 hours PU stayed at 432us, then it dropped sharply to
5.6us and then slowly climbed to 18us.
Doesn't seem right to me.
Nothing it does in the first 6 hours has anything to do with
anything. (1) The oscillator will be swinging around wildly
(comparatively
Mark wrote:
I recently purchased a pair of Z3805A
The problem I am seeing on both is the predicted uncertainty is high
compared to other receivers I have seen.
I am experiencing a PU of ~8us for the first and ~24us for the second.
My questions are,
What could be causing such bad figures?
Bruce wrote:
Switch mode power supply ?
FLL or PLL loop?
It's a distribution amplifier, so one wouldn't expect it to have an
FLL or PLL loop -- and the manual does not mention one. However,
according to the manual it does have (in sequence) a low-Q LC input
filter, a rather aggressive
Bob wrote:
Some of these clocks and watches seem to like midnight as the magic
time to synchronize. That's certainly what the Casio's do.
Mine (it's a Brookstone, I don't know who manufactured it) will go a
few days without a successful sync, then it switches to trying every
two hours until
Peter wrote:
I am not convinced the temperature control in mine is functional.
Temperature control is a capability within Lady Heather (not the
Tbolt itself) and requires external hardware (e.g., box and fan) to implement.
Best regards,
Charles
Garren wrote:
Can anyone tell me how to turn off the satellite display on the
lower right of the display?
In the Graph menu (type g), you have three choices for displaying
the ADEV tables and/or the satellite map: ADEV tables only (type
a), Map only (type m), or Both (type b). You are now
Peter wrote:
The antenna has a pretty clear sky view right now. I have about 75
feet of cable, 25 feet that came attached permanently to the
antenna, might be RG-59, and a 50 foot extension which is a new
piece of good quality RG-6 CATV cable.
Perhaps the antenna (came with the tbolt in
Garren wrote:
I don't doubt that my oven could be the problem but I would think a
lot of people have their tbolts sitting in a room or basement with a
lot more temperature swing than 2.5C. I also monitor the inner oven
temperature where the oscillator is located and it remains stable at
67C
Could you put [scans of the manual] on a suitable server?
I don't know what server would be suitable. * * * Any suggestions?
http://www.ko4bb.com/Manuals/01%29_Upload_Instructions.php
Best regards,
Charles
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time-nuts mailing list --
Joe wrote:
Back when I was in product engineering there was a VCO design that
used a superfilter circuit. It consisted of a pass transistor and
a filter cap from base to ground. The gain of the transistor
multiplied the effective capacitance. I have not seen this configuration since.
They
Lester wrote:
For a regulated power supply, make one using a 723. The 723 has
far lower noise out than the monolithic regulators.
If you are willing to design your own regulator using a 723, you may
as well use a few more parts to get a much better result. Neither
the internal reference
tvb wrote:
I'll answer the question with anther question -- how does one
properly measure power supply noise? Does it boil down to a single
number, a couple of key numbers, or is it a plot, or several plots?
There are a number of standard ways, some of which have been
mentioned by others,
Bob wrote:
An AD 797, a couple of metal film resistors, and a fairly large (say
47 uf) plastic cap work pretty well.
The band from 10 Hz down to 0.1 or 0.01 Hz is generally important
when testing oscillators. To keep the 797 input noise density below
a few nV per root Hz, the terminations
Scott wrote:
Liquid acetone requires special handling and pressurized cells to
keep it from explosively disassociating.
Did you mean liquid acetylene? Liquid acetone is sold in nearly
every hardware and drug store in the US, and is one of the usual
solvents into which acetylene is
Mark wrote:
Does anyone have any suggestions for an antenna that would be
significantly better than a Symmetricom 58532A for typical time nuts
applications. Immunity to other transmitters is also a
consideration for me, and this may push me towards staying with the 58532A.
I use an
Joe wrote:
If [Spectracom WWVB receivers] were dirt cheap, I'd probably pick
one up. If you could wire in an external standard, it would still be
useful for the phase comparator.
That's what I did with my 8163. You need to add a Wenzel-style
two-PNP squarer and use the squarer output to
Paul wrote:
Charles sort of depends on the signal quality.
My first approach shared used a modification to the 8163 to flip the phase.
But on the east coast things can be quite a challenge the squaring circuit
was unreliable.
I was responding to Joe's observation that you could use one of the
Ed wrote:
Is it manually adjusted right at the oscillator? If so, just opening
it up and sticking a screwdriver in there gives it a thermal shock,
and the adjusted element will have mechanical stress that has to
settle out too - the value can change for a while.
The 04E standard used in the
Ed wrote:
On opening it up I found that the circuitry includes a 74LS73 dual
JK FF, and a 74LS140 - very obscure - apparently a dual 4-input gate
of some sort.
AFAIK, the '140 was only supplied in the S series (74S140). It's a
dual 4-input NAND 50 ohm line driver.
Best regards,
Charles
Nate wrote:
The PRS10 manual has a full parts list and makes numerous references
to the schematic, but the schematic itself isn't part of the
document. Anyone able to confirm the identity of the part I'm looking at here?
For schematics, see http://www.ko4bb.com/manuals/. Search for prs10.
tvb wrote:
do either of you have actual tempco numbers?
I checked my notes and found that I did not record any free-running
tempco values. My observations were based on the scale factors I had
to use to get the temperature and DAC graphs in Lady Heather to
overlay each other. I initially
Sarah wrote:
All three have Trimble 37265 OCXOs
Just a curiosity. Is there any way to check that via software? Did you
just physically look under the cover, or how did you figure out which
type of oscillator your thunderbolt has?
You need to open it up. There is a sticker on the OXCO can:
tvb wrote:
the tempco can be inferred from temp and quadratic PPS offset
residuals (EFC gain is not a factor in this case)
It would be interesting (to me, at least) to know the spread of EFC
gains from a reasonable population of Tbolts.
Best regards,
Charles
Bill wrote:
Well, perhaps you are not looking close enough. That is you need to
be observing
at a finer level of comparison. The changes, observed here and at another
location, are in parts in 10-10 to 10-11 range, sometimes
larger. At one of the
locations there was a direct correlation
Warren wrote:
During normal operation my Tbolt uses the temperature and ADC data
to in its Kalman filter that then can predict a simple linear
temperature constant, and simple linear ageing rate.
* * *
But the **Only** time the Kalman filter is used is during
Holdover. It does this
Mark wrote:
Although the Trimble oscillator has superb phase noise
performance, it has TERRIBLE temperature sensitivity.
It appears that most do but some don't. Between the results I have
seen posted on the list (Lady Heather screen shots) and my own data,
they seem to fall into two
Chris wrote:
The goal, well my goal is to build a GPSDO to this set of requirements
1) well under 1/2 the cost of the t-bolt.
2) can be made with common parts and skills most people have
3) is completely modifiable (open source software)
* * *
if you could use the GPSDO a a local
John wrote:
What's *really* interesting, though, is the idea that collectively
we might develop some standard measurement protocols that would be
reproducible in a number of (amateur) labs.
I agree, but I didn't dare to dream so large when I wrote:
From my perspective, the most
Don wrote:
you guys are reinforcing that just because its' cheap won't mean it
won't work.
Of course it doesn't. But keep in mind that working spans several
orders of magnitude in this area, and what one needs to design and
build depends on what degree of working one needs to support the
Paul wrote:
The following comment appeared on this list recently and it scared
me a little:
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 to apologize to all sr620 friends). I have to run it for at
Hal wrote:
I can see two ways to recover. One is to jump the 10 MHz clock by 10 cycles.
The other is to adjust the frequency so that the PPS slews back to on-time.
The first approach gives you a second with the wrong number of cycles. The
second approach has your clock frequency off for a
Chris wrote:
I have the 10MHz output from David's divider feeding the counter. When
fed from this the Band 2 seems unreliable starting at 10MHz. If I feed
it 10Mhz at 50mV from my sig gen it starts reliably. Is it a mismatch
from the divider, or has it perhaps not got enough drive level?
Chris wrote:
Band 2 should work from -20dbm (22mV RMS) right across its 10 MHz to 1
GHz range according to the manual. Even with 190 MHz into it it takes
at least 30mV to start triggering, sometimes up to 40 mV. 40 mV will
reliably fire it across its full range once it warms up a bit.
Band 1
Chris wrote:
If I read this correctly, I'm looking at
9,999,999.97 Hz ?
Correct -- the small digit to the right is the exponent. As others
have mentioned, by holding the UP arrow key in for about 3 seconds,
the 1992 will switch to a 10-second gate and give you one more digit
of
Chris wrote:
According to the documentation I have, pins 2, 4, and 5 are all tied
together internally
I think you may be correct. My recollection was that it needed to be
done at the connector, but I may be mis-remembering. Worth a check, though.
If you have Pin 6 ranging from + 5 V to -
Bob wrote:
I've heard much talk in this group about the power supplies on the Z3805.
* * * my Z3805 * * * started producing a real bad smell after a
few hours, the classic burnt transformer type. * * * I opened the
unit and found the 25W 5V, +/-15V (made by ATT) was real,
Doug wrote:
I'll place a preamp in line to see if that increases the SS on the
3805 , maybe my problem is the GPS RX isn't well. Great point.
Note that most GPS engines (including the one in the 3805) report
carrier-to-noise ratio (C/N), NOT signal strength. C/N is a function
mostly of the
Chris wrote:
My perpetually drifting 10811 pretty quickly made it to the negative
voltage rail on the control voltage.
Is this an oscillator you just powered up after it had been off for a
long time? The most common versions of the 0811 are specified for
drift of less than 5 x 10e-10 per
This has probably already been posted more than once, but if anyone
is still looking for a description of the new WWVB modulation scheme:
http://tf.boulder.nist.gov/general/pdf/2651.pdf (Sept. 2012)
Best regards,
Charles
___
time-nuts mailing
david wrote:
Given that slew rate is so critical, why do we distribute sine waves
and perform the zero-crossing detection at every target instrument?
Magnus made some good points in response to your question. To
elaborate a bit: it is much easier to provide a friendly transmission
I could start a Wiki for Time Nuts, if you like, or anyone else
could start one of course.
Don't forget that Didier already has a wiki for precision timing:
http://www.ko4bb.com/dokuwiki/doku.php
Best regards,
Charles
___
time-nuts
I just loaded it down with a 50 ohm load and looks perfect.
One of my design pet peeves is not anticipating what users may
do. For example, not anticipating that someone might terminate an
output in a high impedance rather than in the rated impedance, or
leave unused outputs
Are LightSquared still trying to get some value from their contributions?
Of course they are. Lightsquared (LS) bought low-valued spectrum
at fire-sale prices, speculating that with rule changes and waivers
they could use it for a terrestrial broadband network, in which case
its value
The Power Output is 0.5 Watts and it claims a jamming range of 1-10 Meters.
Anybody think there is something wrong?
I'd expect a much greater range with a 0.5 W jammer. But note that
0.5 W is the total output power -- the transmit power is only 10
dBm (0.01 W). Whatever those terms mean.
I did put a dab of jell super glue on each of the screw heads, after they
were tightened down, I then wiped them clean. Maybe a bit of RTV would be
appropriate as well.
If you are trying to weatherproof an outdoor item, you will probably
find that 3M 5200 marine adhesive/sealant is the
Chris wrote:
After some measuring my general run of thumb is Anything you
leave plugged in and running 24x7 will cost you triple digits of
dollars (at least) over a year
Well, that's a lot of anything. There are 8760 hours in a year, so
a 1 kW load will consume 8760 kWH per year. We pay
Jim wrote:
As you can imagine, it turns out that foam can be too stiff or too
soft, and that the appropriate foam density and thickness is
dependent on both the mass of the thing being supported and the
expected loading.
You also need to pay attantion to what parts of the item can bear how
Gary wrote:
Fedex ground is awful. Fedex air is fine.
That is our experience, as well. It may vary from region to region
-- the FedEx ground service uses contractors for local delivery. Our
contractor seems to take pride in damaging as many items as badly as
possible. I have witnessed
Greg wrote:
Shortly after I started bidding on eBay back in the 90's, I quickly
learned that many of the sellers are not knowledgeable equipment shippers.
Amen. And that is the most polite and charitable description possible.
I was surprised how the sellers would work hard to meet those
Said wrote:
you make and post negative assumptions about a seller without any
first hand experience
* * *
It is unfair to post that kind of negative opinion without you
having any first hand experience with them.
This is already way out of hand -- so with this, I'm done:
I
Bob wrote:
The strange temperature chip in the later TBolts isn't much of an
issue. The chip is poorly located for temperature control. It only
seems to impact the plots on Lady Heather. Trimble wasn't bothered
enough by it to patch the firmware.
My experience is consistent with this.
Said wrote (re: eBay 58503As):
they work well for me, look brand-new, and came with power supply, rs-232
cable, and antenna. I think it's a 5V antenna. The unit had about 37000 on
the lifetime.
The seller has close up photos, that's what the units look like. I plugged
in the power, ran GPSCon
Said wrote:
Not sure why this is confusing to you, he clearly explains all the
differences in the description
I don't see anyplace where he explains all the differences, clearly
or otherwise. And as I said, ALL of the descriptions I've seen
(including the descriptions of the Z3805-based
Luc wrote:
We have a product that have been specially design for these : NGA-DIS
Thank you for the link. The data sheet raises a few questions:
The sine wave input level is specified as 1Vrms nominal 0.5V Peak to
peak. Of course, 1Vrms is ~2.8Vp-p. It is not clear what this
Michael wrote:
I'm still not entirely sure this is a good idea though, seems like a
low-temp oven for the whole tbolt would be better if you want
thermal stability.
Precisely because it is not clear that holding the backplate of a
Tbolt at a constant temperature is the best way to keep the
Remember * * * these DAs are designed be unity gain and to
handle approximately 1 volt p-p so be carefull of clipping if you
drive much more than that level or alternatively, pad down the input
to a 1 volt level.
Also, video DAs are designed to drive 75 ohms (the video world's
standard
I have two Thunderbolts that I'm monitoring with
Lady Heather. The temperature on the older unit
(MFG 2/26/2004) seems to track the
environment. The newer one (MFG 11-24-2004)
shows 44.75 °C and only changes in increments of exactly 1°.
Sounds like the newer one has the newer
Grant wrote:
I tamed the provided switching power supply noise with some L's and
C's, and am now looking at the 10MHz output on a spectrum analyzer.
Here is what I measured:
10MHz +9dbm
20MHz-50dbm
30MHz -37dbm
no obvious higher harmonics
broad noise envelope at 60 75MHz @ -60dbm
john wrote:
Or they [line harmonics] were cancelled by running the TBolt and
spectrum analyzer from the same AC circuit. That's tripped me up before.
Good thought, although probably not the case here. The Tbolt is
supplied from a double conversion UPS with an output that is not
referred
Chuck wrote:
I don't quite know what to say about that. Trimble seems to think that bullet
antenna is the right thing to use. Somehow, I would think they should know.
I normally use a choke-ring survey antenna, but I also have a Trimble
Bullet III, P/N 41556-00 (RoHS version is P/N
Michael wrote:
One circuit I was recommended when I was looking for ideas uses a 1M
resistor to feed the output of the inverter back to the input to self-bias
That works OK, but you have to be careful. Without an input signal,
there can be excessive quiescent current through the inverter
Don wrote:
the fet breakdown voltage has of course got to be high enough.
If the nuvistor is used as a common-cathode or common-grid amplifier,
you can cascode the fet with a bipolar to extend its drain voltage
range. You will need to come up with an appropriate bias source for
the
Joe wrote:
I was recently reading the manual for the TimePod. It looks quite
nice. I'm curious as to the price.
http://www.miles.io/
Best regards,
Charles
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Dan wrote:
The attached LH plot shows what happened when it was moved slightly
on the bench two or three times. What surprises me is that the DAC
plot remains offset after everything else has settled.
The movement event(s) appear to coincide with about 3 hours of
significant temperature
Chris wrote:
Actually LightSquared is an investment firm. They don't make any
technology product. The company is run by a banker. Had their plan
worked they would have ben in effect a radio wholesaler buying from
producers and sellers to retailers who would then sale to end users. They
From today's communications news (fair use):
LightSquared stressed its intention to deploy a nationwide 4G
wireless broadband network, during a meeting with Angela Giancarlo,
chief of staff to FCC Commissioner Robert McDowell. The commission
has some legal and policy responses it can take to
Don wrote:
It's interesting to note (to ask?): When did someone get smart enough to
start measuring 1/86 thousandth of a day
That is generally considered to be the 10th/11th century Persian
Muslim mathematician and astronomer, Abu al-Rayhan Muhammad ibn Ahmad
al-Biruni (a.k.a. Alberonius
Bruce wrote:
The essentials of a Wikinson TDC can be simplified to the attached
circuit which only requires the addition of a zero crossing
comparator to monitor the voltage across the capacitor C1.
A few refinements to improve the capacitor charging current
switching transitions and the
Stewart wrote:
It's a design fault and eventually all of them will fail.
I'm not convinced of that. There has been substantial discussion of
Racal switches on the list in the past, and I suggested at one point
that the failure mechanism (dry, cracked rubber) could be related
to the
Gary wrote:
Most of those no antenna rules can't be enforced. They can control
the color of the antenna. Yes, really. For example, CONUS, you can
have any number of 1 meter dishes. You might have to paint the dish.
I believe Gary is referring to the FCC's OTARD (Over-the-Air
Reception
Hal wrote:
How many of you have used the Tek scope-probe to BNC adapter? I tried a bit
but couldn't find anything on the web. The idea was (roughly) that you put a
BNC Tee in the line you wanted to watch and this magic gizmo on the Tee.
I have some. I don't use them often, but they are
Chris wrote:
Where are you placing your antenna? I'm curious because you say the
choke ring helps. Is it close to the ground, near a building? What
might be the cause of the muiltipath that the choke ring is helping
with
I've been working with RF long enough not to expect easy answers when
Chuck wrote:
My Lucent antenna arrived today.
Has anyone compared this antenna with the mushroom that
came from China with the used Thunderbolts???
I have five GPS antennas -- a Garmin mag-mount puck designed for
vehicular use, a Garmin marine mushroom, a Lucent timing antenna
like yours,
Ulrich wrote:
The Smartclock in difference seems to be able to adapt regulation
parameters to its measurements of ocxo stability and long term drift.
I do not know any details about Smartclock, but I believe one of the
things it does is to adjust the oscillator disciplining parameters
Bruce wrote:
The above reverse isolation [~35 dB] is about 25dB lower than I would expect.
D'oh! Bruce is right -- I calculated the reverse isolation
incorrectly. I had only been expecting 40 dB, so I didn't question
the result. The breadboard actually measured nearly 63 dB.
Stable
Bruce wrote:
A circuit schematic for a current feedback triple with reasonably
low noise and distortion is attached.
Quite a good performer for such a simple circuit. I found, both in
modeling and on the bench, that there is the usual noise bump at
200-300 MHz and non-monotonic behavior
Randy wrote:
if one is distributing 10 Mhz, does it really
matter what the circuit does at 300 and 900 Mhz??
That depends on what it is feeding and what noise
and other signals are getting to the DA
input. Some synthesized 10 MHz sources produce energy well above 10 MHz.
I consider
Juerg wrote:
Having a M12+Timing GPS driving the 1 Hz input of my PRS10. I decided
to upgrade my house referenc switching to a Tbolt as the 1 Hz source.
* * *
Tests showed maximum deviation of 2 nsec with the Tbolt over 1000
seconds
* * *
Here are my questions:
Are 2 nsec
Bruce wrote:
A circuit schematic for a current feedback triple with reasonably
low noise and distortion is attached.
One caution regarding the 100 uH inductor (L3) -- many inductors of
this value exhibit self-resonance below 10 MHz, so some care may be
necessary in selection.
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