Paul
It weighs 30 lbs. Pictures are on face book or I can email with an address.
Bill
-Original Message-
From: paul swed
Sent: Wednesday, January 15, 2014 12:20 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] fast edge, rise time.
Bill
Interesting
: Tuesday, January 14, 2014 12:02 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] fast edge, rise time.
You might be interested to know this was discussed in a paper by Jim
Andrews (founder of Picosecond Pulse Laboratories):
http://www.nist.gov/calibrations/upload/im
.
Thanks,
Bill Reed
-Original Message- From: Bill Reed
Sent: Tuesday, January 07, 2014 7:53 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] fast edge, rise time.
Hi,
Since you guys are interested in fast pule generators, I have one you may
-Original Message- From: Bill Reed
Sent: Tuesday, January 07, 2014 7:53 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] fast edge, rise time.
Hi,
Since you guys are interested in fast pule generators, I have one you may
be
interested in.
I got
Reed
Sent: Tuesday, January 07, 2014 7:53 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] fast edge, rise time.
Hi,
Since you guys are interested in fast pule generators, I have one you may be
interested in.
I got it in govt. auction about 25 years ago
under Impulse.
Bill Reed256 586-3446
-Original Message-
From: ct1dmk
Sent: Sunday, December 29, 2013 7:36 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] fast edge, rise time.
Thank you all for your comments on this subject.
Happy new year
Thank you all for your comments on this subject.
Happy new year.
Luis Cupido.
ct1dmk.
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On Fri, 27 Dec 2013 02:16:26 +
ct1dmk ct1...@gmail.com wrote:
Since the amplitude and timing parameters are to be controlled (pulse
timing come from an FPGA) I really need a solution using that trivial
switching element fet or bipolar (and can't really do a more exotic
scheme if I cant
On Fri, 27 Dec 2013 11:30:00 +0100
Attila Kinali att...@kinali.ch wrote:
When you have the pulse you can use some standard RF amplifier circuit
that drivers your transformer. Setting the amplitude should be easy too.
I just reread your first mail and realized that this amplifier might
be your
Hello,
I'm willing to generate a pulse (of some few hundred volts)
by discharging a capacitor into a pulse transformer
I'm solely interested is the active edge (call it either rise or fall
depending on the
wiring of the output of the transformer).
The target is 4ns, while ideas seemed to be
On 12/26/13 8:07 AM, ct1dmk wrote:
Hello,
I'm willing to generate a pulse (of some few hundred volts)
by discharging a capacitor into a pulse transformer
I'm solely interested is the active edge (call it either rise or fall
depending on the
wiring of the output of the transformer).
ns
The target is 4ns, while ideas seemed to be clear at some point, now I'm
having doubts if better to use a MOSFET or a bipolar transistor
as the switch element. Experiments with MOSFETs presented me some
difficulties charging the gate capacitance having some trouble to achieve
something in the
On Thu, 26 Dec 2013 16:07:49 +
ct1dmk ct1...@gmail.com wrote:
The target is 4ns, while ideas seemed to be clear at some point, now I'm
having doubts if better to use a MOSFET or a bipolar transistor
as the switch element. Experiments with MOSFETs presented me some
difficulties charging
Hi
If you go the Krytron route you probably will need some fairly fancy
transformers as well….
Bob
On Dec 26, 2013, at 11:19 AM, Jim Lux jim...@earthlink.net wrote:
On 12/26/13 8:07 AM, ct1dmk wrote:
Hello,
I'm willing to generate a pulse (of some few hundred volts)
by discharging a
time and frequency measurement
Subject: [time-nuts] fast edge, rise time.
Hello,
I'm willing to generate a pulse (of some few hundred volts) by discharging a
capacitor into a pulse transformer I'm solely interested is the active edge
(call it either rise or fall depending on the wiring
On 26 December 2013 16:07, ct1dmk ct1...@gmail.com wrote:
Hello,
I'm willing to generate a pulse (of some few hundred volts)
by discharging a capacitor into a pulse transformer
There are probably more modern approaches, but a thryatron is one
possibility. Shame I put on in the dump a few
Can you say more about your application? What does your load look like?
What pulse shape? There are well-known solutiuons for most problems.
As Jim said, a lot depends on the energy you need per pulse. What works
for a few mJ will not work for MJ
BTW, SCRs probably switch a lot faster than
Years ago I had a cousin who ran a civilian calibration lab. For calibrating
scopes, etc, for rise time he used a mercury wetted relay which he claimed
had nearly instant rise time and no bounce. Seems that he used a resistive
divider and the mercury relay shunted a portion of the divider. With
There are very fast pulsers, some in NIM, that use a charged coax line and
Hg relay to calibrate Pulse Height analyzers. The line length sets the
pulse length; the charging voltage, the pulse height.
-John
Years ago I had a cousin who ran a civilian calibration lab. For
On Thu, 26 Dec 2013 16:07:49 +, ct1dmk wrote:
The target is 4ns, while ideas seemed to be clear at some point, now I'm
having doubts if better to use a MOSFET or a bipolar transistor as the
switch element. Experiments with MOSFETs presented me some difficulties
charging the gate
Am 26.12.2013 17:07, schrieb ct1dmk:
p.s. ( I switch a capacitor to GND with a transistor (fet or bipolar).
that capacitor has a charging resistor to 48V, transformer has a 9:1
voltage ratio. Pulse average power is quite low a few watt only. At
the primary side some 20A of peak current for
On Thu, 26 Dec 2013 19:38:08 + (UTC)
cfo xne...@luna.dyndns.dk wrote:
Have a look here Jim Williams on eevblog
https://tinyurl.com/nhyvtc3
I advice to be cautious with EEVblog. Dave Jones has a lot of half
knowledge and presents that like he knew exactly what he is talking
about. His
Many thanks to all for the nice tips.
I may narrow down by saying a few more specs as suggested.
The pulse would see a somehow unknown load but for a start I
was suggested to have my source with 50ohm impedance so worst
case would be a short circuit and therefore the pulse would be a current
Are only the amplitude and rep rate variable, or do you vary the width too?
-John
=
Many thanks to all for the nice tips.
I may narrow down by saying a few more specs as suggested.
The pulse would see a somehow unknown load but for a start I
was suggested to have my source
Hi
Unless you want run for 1 second, that rules out a Krytron.
Length of operation also impacts some of the other implementations.
Bob
On Dec 26, 2013, at 9:16 PM, ct1dmk ct1...@gmail.com wrote:
Many thanks to all for the nice tips.
I may narrow down by saying a few more specs as
There are some good alternatives to krytrons. Just don't expect to be able to
afford or export them. ;)
On Dec 26, 2013, at 21:26, Bob Camp li...@rtty.us wrote:
Hi
Unless you want run for 1 second, that rules out a Krytron.
Length of operation also impacts some of the other
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