On Sat, 18 Feb 2012 18:59:21 -0800
Eric Lemmon wb6...@verizon.net wrote:
I hooked up a linear triple-output bench supply to run the Thunderbolt, and
now the 8040C locked up perfectly on the 1 PPS signal. Since I don't want
to tie up one of my bench power supplies to run the Thunderbolt, I
On Sun, 19 Feb 2012 01:07:04 -0500
Peter Gottlieb n...@verizon.net wrote:
Do you believe there may be a problem for those who are
reverse-engineering, and posting on the open net, items which may be
covered under these regulations?
Not unless you live in the US. Then you are bound by the
On Tue, 21 Feb 2012 15:06:18 -0800
Chris Albertson albertson.ch...@gmail.com wrote:
On Tue, Feb 21, 2012 at 2:33 PM, Tom Knox act...@hotmail.com wrote:
Sadly I heard recently that the US is 27th in Math and 25th in
Science. I challenge the old DXers too name 25 countries smarter
then we
On Mon, 27 Feb 2012 10:10:26 +0100
Attila Kinali att...@kinali.ch wrote:
On Tue, 21 Feb 2012 15:06:18 -0800
Chris Albertson albertson.ch...@gmail.com wrote:
On Tue, Feb 21, 2012 at 2:33 PM, Tom Knox act...@hotmail.com
wrote:
Sadly I heard recently that the US is 27th in Math and
On 2/27/2012 12:48 AM, Attila Kinali wrote:
If you are really time-nutty, you can let the DC/DC converters produce
a voltage about 1V above what you need and use low noise LDOs (ie not
the 78xx or LM317 Co) to produce the voltages for the thunderbolt.
This should give you a 60-80dB damping
On Fri, 24 Feb 2012 10:41:37 -0800
Chris Albertson albertson.ch...@gmail.com wrote:
A good feature to look for is autorouting. and design rule checking.
Of course every engineer thinks he is smarter than this kind of
software. Mostly he is but it is good to use software that simply
will
Having designed LDO chips, people expect them to perform miracles
well beyond reality. If you have a PNP pass and you are sitting near
dropout, you get control loops that are an ugly combination of a path
to keep the PNP from getting saturated plus one to control the
voltage.
I never
Having designed LDO chips, people expect them to perform miracles
well beyond reality. If you have a PNP pass and you are sitting near
dropout, you get control loops that are an ugly combination of a path
to keep the PNP from getting saturated plus one to control the
voltage.
I never
Hi Bob,
I wonder what the other oscillators that others are receiving look like in
the SA. Replacing all the capacitors would take a serious effort, not sure
if it would be justified.
Can I ask how can you know all that by looking at the spectrum plot?
Thank you,
Roberto EB4EQA
-Original
On Mon, 27 Feb 2012 01:29:11 -0800
gary li...@lazygranch.com wrote:
On 2/27/2012 12:48 AM, Attila Kinali wrote:
If you are really time-nutty, you can let the DC/DC converters produce
a voltage about 1V above what you need and use low noise LDOs (ie not
the 78xx or LM317 Co) to produce
Roberto
It is called tens of years of experience
Bert Kehren
In a message dated 2/27/2012 5:16:28 A.M. Eastern Standard Time,
rbarri...@msn.com writes:
Hi Bob,
I wonder what the other oscillators that others are receiving look like in
the SA. Replacing all the capacitors would take a
Those were bicmos designs where the LDO was to provide voltage for running
controller chips.
I've only done PMOS for stand alone LDO.
-Original Message-
From: Steve iteratio...@gmail.com
Sender: time-nuts-boun...@febo.com
Date: Sun, 26 Feb 2012 23:54:20
To: time-nuts@febo.com
The p-fet LDO can never do better than a cap divider formed by Cds and the
load. Just draw the circuit and this is obvious. There is always a feedthrough
path via Cds.
I'm not so sure LDOs can handle perfect caps. ;-)
-Original Message-
From: Attila Kinali att...@kinali.ch
Sender:
I was working for Zyfer (Odetics) when they did this mod. Yes, the only
difference between the 365 and 565 models is the GPS engine, firmware and
different front panel.
And yes, that backlight control has caught quite a few people out in the
past!!
Rob Kimberley
-Original Message-
From:
Hi Bert,
I've googled for that and didn't find a related paper :-)
Regards,
Roberto EB4EQA
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of ewkeh...@aol.com
Sent: lunes, 27 de febrero de 2012 11:44
To: time-nuts@febo.com
Subject: Re:
Hi
...or my lack of experience. I think I first saw problems like these in 1975.
Somehow they keep showing up :)
Bob
On Feb 27, 2012, at 5:44 AM, ewkeh...@aol.com wrote:
Roberto
It is called tens of years of experience
Bert Kehren
In a message dated 2/27/2012 5:16:28 A.M.
Joe
Good to hear that you recovered the 5061. A couple of comments.
Ground screws do indeed oxidize and it can be a very good fix for older
gear to simply loosen and re-tighten those screws or to replace pop riveted
terminal lugs with real screws and lock washers.
Nicads
My experience with modern
On Mon, 27 Feb 2012 08:59:02 -0500
paul swed paulsw...@gmail.com wrote:
Granted today there are alternates to those evil nicads. So perhaps they
have a respectable life.
Not really. NiCd and NiMH are optimized for price these days, not
to last long. Li-Ion and Li-Poly are even worse (optimized
Folks, I have received the following notices:
__
Notice of Interruption to MSF 60 kHz Time and Frequency Signal
The MSF 60 kHz time and frequency signal broadcast from Anthorn Radio
Station will be shut down over the periods:
8 March 2012
Digging through the literature online, I see the high voltage LDOs are
still PNP, at least for the manufacturers that show representative
circuits. I was pretty such of this when you did your post, mostly
because I couldn't see how you would drive the NPN and maintain a low
dropout. [You would
Attila,
It turns out that the MeanWell T-30B switching power supply does, indeed,
require a minimum load on each output- but especially so on the +5 volt
output, which powers the Thunderbolt's 10 MHz and 1 PPS output circuitry.
The specs for this power supply are: +5V, 0.5-3.0A; +12V, 0.1-1.0A;
Just wanted to mention a terrific Thunderbolt Monitor design by
VK4GHZ Adam Maurer (http://www.vklogger.com/forum). It monitors the
Thunderbolt output on 4 screens (4x20 display) so no computer hookup
is necessary to follow the GPS. A companion Commander makes use of
a PICAXE to cause
One has to go through their sign-up process just to take a look.
On 2/27/2012 10:20 PM, James Robbins wrote:
Just wanted to mention a terrific Thunderbolt Monitor design by VK4GHZ Adam
Maurer (http://www.vklogger.com/forum). It monitors the Thunderbolt output on
4 screens (4x20 display) so
That doesn't seem to be the case on this side of the pond.
I could read anything posted, just cannot post without signing up.
73, Dick, W1KSZ
-Original Message-
From: Peter Gottlieb n...@verizon.net
Sent: Feb 27, 2012 8:26 PM
To: time-nuts@febo.com
Subject: Re: [time-nuts] VK4GHZ
I'm (slowly) working on one based on Arduino. No plan to use anything
like four screens. I think the way to go is one but with a rotary
knob so you can scroll and click the knob to make menu selections.
But then for even less cost you can make it web based. You save the
cost and size of the
I have known about this project for a while, I was excited at first but was put
off by the price tag,
the fact that it is closed source and that it's not available as a kit.
There is another project on the horizon by James M1DST that is based on the
Netduino platform which will be open source.
On Mon, Feb 27, 2012 at 8:04 PM, Sam li...@digitalelectric.com.au wrote:
I have known about this project for a while, I was excited at first but was
put off by the price tag,
the fact that it is closed source and that it's not available as a kit.
There is another project on the horizon by
Netduino is the Arduino with an Ethernet interface on it.
Not quite, The Netduino is an open-source platform using the .NET Micro
Framework.
http://www.netduino.com
The Netduino Plus shield has on-board Ethernet.
http://www.netduino.com/netduinoplus/
Sam
- Original Message -
From:
The PNP bipolar and P-channel MOSFET architectures do provide the
best low-dropout performance, but as I understand, do not provide the
best HF line rejection. Looking at the overall circuit - a high gain,
band-limited amplifier driving a P pass device puts it in a
common-base (or -gate) mode,
Ed wrote:
So, for best HF noise performance where the input noise may be
large, it's best to use a follower or shunt regulator topology,
despite the lower efficiency - unless efficiency is more important.
To put it more bluntly, the last time I looked (it has been a while,
so there may be
Hello,
I have two units that don't produce any output and the lock pin floats
around +2.3 volts continuously. The +15v load starts at about 1.8A
and drops down to about 0.7A on both units, but I never get a +5V or
0V on the lock or a 10MHz out signal. (I'm not using an LED on the
lock pin, just
Hi,
I gather that some of these units require a +5V supply on pin 4 of the
connector and some do not. Could that be the problem here?
Chris
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Dave hartzell
Sent: 28 February 2012 05:18
Hi Dave,
A silly question, although you did not indicate, you are supplying a separate 5
volts to the unit are you not ?
BillWB6BNQ
Dave hartzell wrote:
Hello,
I have two units that don't produce any output and the lock pin floats
around +2.3 volts continuously. The +15v load starts
Bill,
Yes, +5v but I was doing it incorrectly (bad hookup wire on both
units). I haven't checked the second bad unit, but it will probably
work now too.
Sometimes I have to hit the send button before I find my errors.
Thanks for the thoughts,
Dave
On Mon, Feb 27, 2012 at 10:31 PM,
Well this is the granddaddy with 3V of dropout. Not much rejection at
high frequency, but the design is old. Modern LDOs are better,
especially with P-fet pass device.
http://www.ti.com/lit/ds/symlink/lm317-n.pdf
On 2/27/2012 9:13 PM, Charles P. Steinmetz wrote:
Ed wrote:
So, for best HF
Gosh, and I just bought one from Sparkfun for another project :-)
Don
Chris Albertson
On Mon, Feb 27, 2012 at 8:04 PM, Sam li...@digitalelectric.com.au
wrote:
I have known about this project for a while, I was excited at first
but was put off by the price tag,
the fact that it is closed
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