Zener Noise (was: 1N4007 varactors)
 

Jim wrote: "...what is a good source of electronic broadband noise
from low HF through high UHF -- say, 5 to 500 MHz.?"

A linear feedback shift register. Small, repeatable. 500MHz should be
no particular problem these days. (There's an idea for some IC
manufacturer...32 bits clocked at 1G/sec repeats every 4 seconds, which
would be OK, but I'd prefer 40 or more bits. Should fit nicely into a
5 pin SOT-23: power, gnd, reset, out, ...)

Zener Noise
 

In rec.radio.amateur.homebrew Tim Williams wrote:
"John Larkin" wrote in message
...
I've got a gaussian noise generator, ...

GR?

Come again?

When I see "GR", I think "General Radio", and salivate gently. They
made some really, really nice test gear.

--
Mike Andrews, W5EGO

Tired old sysadmin

Zener Noise
 

Nice touch, Bill.
73, Steve, K9DCI

"Bill Turner" wrote in message
...
ORIGINAL MESSAGE:


"Phil Hobbs" wrote

snip
and can calibrate the frequency response with a spark plug.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

I generally use a pipe wrench, but I'll try anything once.

Bill, W6WRT

Zener Noise
 

On Wed, 11 Jan 2006 23:47:37 +0000 (UTC), "Mike Andrews"
wrote:

In rec.radio.amateur.homebrew Tim Williams wrote:
"John Larkin" wrote in message
...
I've got a gaussian noise generator, ...

GR?

Come again?

When I see "GR", I think "General Radio", and salivate gently. They
made some really, really nice test gear.

And then let themselves get sucked, by marketing, into large
mainframe-based testers, and lost their ass.

I watched the money-making portable test division in Phoenix get
trashed by the ****-heads in Massachusetts... now you know _part_ of
the source of my animosity toward Massa2****s ;-)

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.

Zener Noise (was: 1N4007 varactors)
 

I've used noisecom for some years, but they are hard to buy in
onesie-twosies and are rather expensive in quantity when you only need one.

They USED to sell seconds that didn't meet spec, but I don't see that offer
on their current website.

Jim



"Clark" wrote in message
...
Try this
http://www.noisecom.com/

Zener Noise (was: 1N4007 varactors)
 

On Wed, 11 Jan 2006 17:00:09 -0600, "Tim Williams"
wrote:

"John Larkin" wrote in message
.. .
I've got a gaussian noise generator, ...

GR?

Come again?

Tim

Is it a General Radio noise generator? I have an old GR noise
generator, and the manual talks about moving the magnet around to
optimize something.

John

Zener Noise (was: 1N4007 varactors)
 

On Wed, 11 Jan 2006 10:08:19 -0800, "RST Engineering"
wrote:

OK, then. A zener makes a poor noise source according to what I'm reading.
Noise.com used to sell off-spec diodes by the onesies for we poor peons to
play with, but for whatever reason that doesn't seem to be the case any
more.

Given that a zener (at whatever current) is a poor noise source, what is a
good source of electronic broadband noise from low HF through high UHF --
say, 5 to 500 MHz.? (No smart remarks about spark gaps.)

We had this already yesterday in '97 and '98.
The internet does not forget anything, so watch your mouth :-)

http://groups.google.de/group/rec.radio.amateur.homebrew/browse_frm/thread/e072aa7cef573f99/9147bca6602ef8d1?lnk=st&q=Gerhard+Hoffmann+noise&r num=1&hl=de#9147bca6602ef8d1

But, my final solution was to buy an Agilent 346c.

regards, Gerhard

Zener Noise
 

Jim Thompson wrote...

I watched the money-making portable test division in Phoenix
get trashed by the ****-heads in Massachusetts... now you know
_part_ of the source of my animosity toward Massa2****s ;-)

That's an amazing extension. Plenty of healthy Massachusetts
companies have been sucked dry by their out-of-state owners.
Obviously the ability to mis-manage a company from a distance
is not notably a Massachusetts sin, unless you're obsessed with
the Harvard Business School's modest influence on the issue.


--
Thanks,
- Win

Zener Noise
 

"Mike Andrews" wrote in message
...
I've got a gaussian noise generator, ...

GR?

When I see "GR", I think "General Radio", and salivate gently. They
made some really, really nice test gear.

Ah, had a feeling it was something about a manufacturer...

Unfortunately(?) no, it appears to be Elgenco, and I also now remember not
finding much info on this device after I picked it up. It's a rack mount
unit BTW.

Tim

--
Deep Fryer: a very philosophical monk.
Website: http://webpages.charter.net/dawill/tmoranwms

Zener Noise
 

Winfield Hill wrote:

That's one thread, perhaps the first in a series. That thread
doesn't have the waveforms I was referring to (although there
are some waveforms in posts 51 and 66). Tony, Bill, Roy and I,
and some others here wasted masses of time on this subject over
a period of a few months, eight and a half years ago. . .

For the record, that was Roy McCammon, not me.

Roy Lewallen, W7EL