FYI Wildwood eLoran will be fired up 1300Z Saturday (today) and 1900Z Monday
thru Thursday. Happy listening. Any reports would be appreciated and I
will pass them along to the engineer that is driving the train.
73,
Bill, WA2DVU
Cape Mahy
-Original Message-
From: billriches
noise figure, noise voltage, noise current:
http://www.ti.com/lit/an/slyt094/slyt094.pdf
On 7/18/2015 2:16 AM, Attila Kinali wrote:
On Fri, 17 Jul 2015 23:25:10 -0400
Charles Steinmetz csteinm...@yandex.com wrote:
A pair of Zetex (Diodes, Inc.)
ZTX849 or FZT849 actually have significantly
Good morning,
I have 3 working XSRM Rubidium RS standards in use, at 60 KHz , the short
term stability is better then the more modern ones but the internal
battery system does not work (well) . External 24 V charger is better.
Ulrich, N1UL
In a message dated 7/18/2015 10:25:58
The whole USO is about $1M, the vast majority of which is labor.
Analysis, testing, paperwork, etc
Jim
Original message
From: Bob Camp kb...@n1k.org
Date: 07/18/2015 02:10 (GMT+00:00)
To: tim...@timeok.it, Discussion of precise time and frequency measurement
Good morning,
the AT Cut is inherently noisier then the SC cut but the SC has some
spurious resonances modes. Measurements below 1 Hz are very tricky as the
oscillator must be (more or less) insulated from hum, infrared (heater) . Here
I
am still struggling .
Ulrich N1UL
In a
I had a few LM394CN left and used one for the pre-amp.
I would try to use another low-noise transistor. Furthermore, you do not
necessarily need a matched pair. The transistor on the right in the
schematic is merely used for biasing the amplifying transistor on the
left. The prices for matched
generally larger transistors running at much lower current than they
inteded for have lover noise figure, but much larger input and [Cbe] and
feedback Ccb] capacitance, the same effect could be achieved putting
--for AC!-- low noise transistors paralell [ signal voltage adds
arithmetically,
Hello Group,
I recently acquired a couple of R S XSD frequency standards and XKE
frequency controllers ( circa mid 1960's ) as well as the manuals that
go with them.
I've had a quick look on the net and haven't found much in the way of
documentation so I have scanned the manuals into PDF
On Fri, 17 Jul 2015 23:25:10 -0400
Charles Steinmetz csteinm...@yandex.com wrote:
A pair of Zetex (Diodes, Inc.)
ZTX849 or FZT849 actually have significantly lower voltage noise than
either the LM394 or MAT12.
I always wonder how you figure out whether a transistor is low noise
or not. What
On 18 July 2015 at 04:25, Charles Steinmetz csteinm...@yandex.com wrote:
Dave wrote:
1) Do you have any suggestions for a replacement for the LM394CN, which is
obsolete and unobtainable from any reputable source? There are plenty on
eBay for a few $'s from China, but the probability of them
Hi
You have (and always have had) two basic choices:
1) Buy a very expensive part from somebody who has gone to the trouble
of characterizing the noise performance and will guarantee at least some
of what they show on the data sheet.
2) Buy a bunch of cheap transistors and test them. Lock in
Dave wrote:
Do you really mean the ZTX849? It is a power transistor (5A continuous
current collector current, 20 A peak collector current), with no
specification for noise on the data sheet. It would on the face of it
hardly seem a wise choice for a low noise amplifier, but perhaps you know
Correction on times for Mon - thurs - start 900 edst - 1300Z
-Original Message-
From: billriches [mailto:bill.ric...@verizon.net]
Sent: Saturday, July 18, 2015 7:05 AM
To: 'billriches'; 'Discussion of precise time and frequency measurement'
Subject: RE: [time-nuts] Loran C returning to
OK LORAN is on the air up in Boston.
I had just turned off various equipment this morning.
So starting it back up after testing it yesterday.
Lots of large static crashes.
Regards
Paul
WB8TSL
On Sat, Jul 18, 2015 at 7:04 AM, billriches bill.ric...@verizon.net wrote:
FYI Wildwood eLoran will be
What GRI is in use I'll fire up my austron as well Central NH location
Content by Scott
Typos by Siri
On Jul 18, 2015, at 1:42 PM, paul swed paulsw...@gmail.com wrote:
Bill I will let you know what the Austrons say for signal level. Fact is
they locked up fast.
My FS700 is taking its time.
Hi Paul - how do you figure boston? The only station up is Wildwood, NJ
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of paul swed
Sent: Saturday, July 18, 2015 1:15 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts]
Good afternoon,
There is a problem in the literature that people confuse the spot noise
figure and the large signal noise properties. Here AF and KF needs to be
known and considered.
Here is the mathematical correct formula in a Word for Windows Form
attached file.
If you use it for
but be sure that you have a hp4470B --a transistor noise analyzer [
http://www.testequipmenthq.com/datasheets/Agilent-4470B-Datasheet.pdf ]
73
Alex
On 7/18/2015 8:47 AM, Pete Lancashire wrote:
I agree with Bob, find a vendor you can trust and make sure you buy from an
authorized distributor
The BFG540 is amongst the best Oscillators oscillators
http://www.nxp.com/documents/data_sheet/BFG540_X_XR_N.pdf
Now you outperform most colleagues
73 de Ulrich N1UL
Last time buy 31-Dec-15. :( Have you heard of any good substitutes?
I've built a lot of amps with BFG591s, and
Uploaded to KO4BB:
Kode Odetics 3100 time interval analyzer op manual
100 ps min timebase, 10 ps error a boatanchor but IEEE488 output. access
instructions in the manual. Will take intervals less than 1 us apart.
about $250 on ebay. Originally for hard disk drive measurements. Set up to use
x10
Hi Bill,
Thank you for your detailed response.
First of all, I'm happy with the SMIQ and I included that only
to show that the spurs do not come out of the spectrum analyzer
(which is an FSU indeed).
Regarding the E4437B: You are right that the data sheet specs
allow this but I find it rather
I agree with Bob, find a vendor you can trust and make sure you buy from an
authorized distributor or if just need two or three parts try to get them
as samples.directly from the manufacturer. The reason for this is you may
get a fake or reject part and you will never know.
Trying to do the
Bill I will let you know what the Austrons say for signal level. Fact is
they locked up fast.
My FS700 is taking its time.
Graham it will sound different as there are no competing stations on other
GRIs. Thats the very first thing that hits you. Additionally its only 1
station. But that same
As expected, loud and clear near Ottawa Canada, approximately 380
nautical miles.
It does sound different from my recollection of Loran. However, this is
only one station transmitting where as before it would have been several
at the same time with different GRI's.
cheers, Graham ve3gtc
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of KA2WEU--
- via time-nuts
Sent: Saturday, July 18, 2015 3:40 PM
To: time-nuts@febo.com
Cc: akpod...@synergymwave.com; alexander.r...@rohde-schwarz.com
Subject: Re: [time-nuts] how to find low noise
BFG540
In a message dated 7/18/2015 6:37:34 P.M. Eastern Daylight Time,
j...@miles.io writes:
Last time buy 31-Dec-15. :( Have you heard of any good substitutes?
I've built a lot of amps with BFG591s, and they also got the axe recently.
Small-signal RF bipolars seem to be an
Good afternoon,
another low noise recommended transistor is the
http://www.cel.com/pdf/datasheets/ne856m02.pdf and for frequencies below
10 Mhz
the 2N2857. This nice fact is that the AF and KF values are published,
the bad part is the the AF=1 value violates the law of physics.
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