That is basically what I do. Bert Kehren
In a message dated 2/11/2011 11:44:56 P.M. Eastern Standard Time,
namic...@gmail.com writes:
One approach for the Tbolt is to use a low dropout low noise linear
regulator (I used a LT1764 set to 11.5 volts) for the 12 volt input
(it is within
Thanks Bill. I am heading right now to the Orlando Hamfest but will be on
tomorrow. Bert
In a message dated 2/11/2011 10:40:03 P.M. Eastern Standard Time,
wb6...@cox.net writes:
Bert,
The data sheet I sent you has a number of possible factory voltage options
indicated
where the specs
Hi all!
I friend of mine wants to construct an experiment for students for
studying random walk noise.
What is the best good available transistor or other parts? All parts he
tested where just to good.
Thank you!
- Henry
--
ehydra.dyndns.info
On 12/02/11 14:16, ehydra wrote:
Hi all!
I friend of mine wants to construct an experiment for students for
studying random walk noise.
What is the best good available transistor or other parts? All parts he
tested where just to good.
Thank you!
Use a standard transistor or diode. Run a
In many instruments, a lot of the fan noise is actually noise from the air
blowing over obstructions, so changing the fan will not reduce that noise,
unless the air flow is reduced. That will be generally true for the type of
equipment that dissipates a lot of heat in a small package, like a
Most AC fans of a given size will have a bigger motor than DC fans of the same
size. That leaves less cross section for the air, therefore for the same air
flow, air will have to move faster and be noisier. It is not a question of 12V
versus 120V, its DC versus AC.
Didier KO4BB
--Original
Wouldn't a zener make a better noise source. You can also breakdown the
emitter-base diode, but watch the current. It can't take more than say 100uA.
-Original Message-
From: Magnus Danielson mag...@rubidium.dyndns.org
Sender: time-nuts-boun...@febo.com
Date: Sat, 12 Feb 2011 14:27:50
On 11/02/11 20:26, Tijd Dingen wrote:
Wavecrest just fell of the Internet for some time and then eventually
re-appeared as GigaMax. All material quite
obvious just changed company name and logo. A few things was cleaned out.
Haven't checked since.
I would think they had financial problems and
For the T-bolt power supply I am using the Mean Well. Model: T-30B
wich I bought out of China for about $45 shipped. It is a switching
supply but seems to be doing the job. As I remember I bought it from
fluke.i
Jerry
On Thu, Feb 10, 2011 at 6:33 PM, time-nuts-requ...@febo.com wrote:
Send
What is the best good available transistor or other parts? All parts he
tested where just to good.
A conducting zenier diode across the input of an amplifier.
--
=
Chris Albertson
Redondo Beach, California
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in software:
http://socrates.berkeley.edu/~phylabs/bsc/Supplementary/NoiseGenerator.html
Chris Albertson
What is the best good available transistor or other parts? All parts he
tested where just to good.
A conducting zenier diode across the input of an amplifier.
--
=
Chris Albertson
also see:
http://ipnpr.jpl.nasa.gov/progress_report/42-77/77M.PDF
remarkable what a little googling will turn up...
Chris Albertson
What is the best good available transistor or other parts? All parts he
tested where just to good.
A conducting zenier diode across the input of an amplifier.
Flicker noise is not the same as random walk noise, the spectra differ.
Using an AC coupled generator (eg a sound card) filters out the low
frequency content.
Zeners and transistors (biased at low current) can be used to generate
flicker noise directly at least for low frequencies where it
Hello to the group
Finally received the heat gun this week and attempted to recover a FRS c Rb
lamp.
In the bad lamp you can actually see a small silver blob and on closer
inspection the center of the bulb front has a small circle of something.
When heated by the normal oven at 177 degrees F the
On 11/02/11 22:51, Geraldo Lino de Campos wrote:
Now that working 5372s are being sold for $50 repairing one may sound a
bad
idea, but in my case shipping would be definitely prohibitive.
I have a 5373 that fails in Histogram, Count ICs, Gate Timer and Meas
Rom,
point to possibly faulty chips
Does anyone have any experience or knowledge of the Efratom Multiplexed
output 10Mhz frequency standard from Fluke.l on EBay (item 290329156915)?
I wonder if it could be used as a distribution amp, but no details about
output impedance, output current capability, etc. He indicates that the
On 12/02/11 21:02, Bruce Griffiths wrote:
Flicker noise is not the same as random walk noise, the spectra differ.
Using an AC coupled generator (eg a sound card) filters out the low
frequency content.
Zeners and transistors (biased at low current) can be used to generate
flicker noise directly
On Feb 11, 2011, at 9:44 PM, Neville Michie wrote:
[...]For the minus 12v I used a ICL7662, these are rare, so a cmos gate
oscillator and diode pump negative generator could be used. I am told the
-12V is quite uncritical.[...]
Thanks for the thoughts. I'm thinking about redoing the power
Dear Paul,
On 12/02/11 21:34, paul swed wrote:
Hello to the group
Finally received the heat gun this week and attempted to recover a FRS c Rb
lamp.
In the bad lamp you can actually see a small silver blob and on closer
inspection the center of the bulb front has a small circle of something.
Kevin Rosenberg wrote:
On Feb 11, 2011, at 9:44 PM, Neville Michie wrote:
[...]For the minus 12v I used a ICL7662, these are rare, so a cmos gate
oscillator and diode pump negative generator could be used. I am told the -12V
is quite uncritical.[...]
Thanks for the thoughts. I'm
On 12/02/11 22:02, Geraldo Lino de Campos wrote:
On 11/02/11 22:51, Geraldo Lino de Campos wrote:
What is the difference between the 5372 and 5373 hardware wise?
Is it only software?
AFAIK there is no service manual for the 5373. The numbers of the boards in
mine are the same that appears on
Well indeed Magnus the black stuff and silver blob were rb.
300 degrees F for 15 minutes made it all go away.
I was using a j thermocouple to measure the temp and right at the bulb.
The trick seems to be for a FRS c to get the blob to the lowest point of the
capsule thats observable. I did this
Dear Paul,
On 13/02/11 00:02, paul swed wrote:
Well indeed Magnus the black stuff and silver blob were rb.
300 degrees F for 15 minutes made it all go away.
I was using a j thermocouple to measure the temp and right at the bulb.
The trick seems to be for a FRS c to get the blob to the lowest
The -12V supply on the tbolt is also used by the oscillator EFC dac (the EFC
voltage can go negative). Any noise on the -12V supply will be just as
effective as noise on the +12V supply at messing things up.
If anybody is looking for a spare 5372A CPU board... I have one.
Also, does anybody know of ROM images for the FFT option, or 5373A images?
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Just came back from Orlando Hamcom. Bought a brand new ATT unit with FRS
and extra boards for $ 50. He has more. Contact me direct and I will help
you find him.
Bert Kehren
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Hey, I was out there today but didn't see that guy. Where is he?
Thanks,
Bill KJ4SLP
On Sat, Feb 12, 2011 at 9:36 PM, ewkeh...@aol.com wrote:
Just came back from Orlando Hamcom. Bought a brand new ATT unit with FRS
and extra boards for $ 50. He has more. Contact me direct and I will
On Feb 10, 2011, at 3:16 PM, Larry McDavid wrote:
I'm seeking a recommendation for a power supply for this Thunderbolt receiver.
I use an HP 6236B that I bought inexpensively on eBay, after reading about
others having good results with that combination. I had to repair it (it had
one or two
Well pretty good news
The lamp voltage went from 1.83 volts a dead bulb to* 8.9 volts a new bulb*.
By adjusting the oscillator I can get to 9.6 volts but I know the the
oscillator will not start correctly at 82 Mhz its happy at 92 Mhz.
Its not locking but that can be due to several issues.
At
By the way I can disconnect pin 1 on the lamp assembly because I made a 5
jumper assembly so that the area can be easily worked on.
On Sat, Feb 12, 2011 at 10:27 PM, paul swed paulsw...@gmail.com wrote:
Well pretty good news
The lamp voltage went from 1.83 volts a dead bulb to* 8.9 volts a new
David,
I bought one unit some time ago for using it as a kind of distribution
amplifier.
It is 04:30 here, so I'll give some details tomorrow.
Regards,
Ignacio
El 12/02/2011 22:03, Dave M wrote:
Does anyone have any experience or knowledge of the Efratom Multiplexed
output 10Mhz frequency
I ordered an EPROM programmer recently. I t should arrive in a month. I will
try to make a copy then.
--
Geraldo Lino de Campos
gera...@decampos.net
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I think the confusion is now perfect:
http://www.mikrocontroller.net/topic/207061#2059725
Let Google translate it from german to your language.
Does the difference come from voltage vs. power spectrum?
Magnus Danielson schrieb:
On 12/02/11 21:02, Bruce Griffiths wrote:
Flicker noise is not
On Feb 12, 2011, at 3:12 PM, Bruce Griffiths wrote:
Cuk switching regulator
Thanks for the tip!
Kevin
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On Feb 12, 2011, at 8:16 PM, Mark J. Blair wrote:
my setup eventually, when I feel a surge of time-nuttiness coming on. :) Even
in its current configuration, it far exceeds my needs for a frequency
reference.
Exceeding your needs? Doesn't seen like that surge of time-nuttiness has hit
yet
On Feb 12, 2011, at 11:03 PM, Kevin Rosenberg wrote:
Exceeding your needs? Doesn't seen like that surge of time-nuttiness has hit
yet ;)
Don't worry, I'm just pacing myself. :)
--
Mark J. Blair, NF6X n...@nf6x.net
Web page: http://www.nf6x.net/
GnuPG public key available from my web page.
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