> Amp (now Tyco) did introduce them. Called "Decoupled Connectors'' Info at
> http://www.te.com/usa-
> en/search.html?q=Decoupled%2BConnectors&source=header
>
> Tyco parts 413476-2 and 5413476-2 are available from Mouser, maybe Digikey
> as well
>
And you might notice that the TimePod itself d
Tim wrote:
All the inputs and outputs were deliberately transformer isolated. Why
break the isolation by using capacitor from coax shield to chassis ground?
You're trying to keep external RF from getting into the enclosure on
the shields. The outputs are still galvanically isolated.
Best r
Anders wrote:
Far-out PN/AM is still 7dB short of the 6502!
Looks like an SNR issue to me, rather than some issue with the linear
regulator noise feeding through?!
AD8055 in non-inverting circuit with 1+2k7/2k7 gain has 9.6 nV/sqrt(Hz)
input-referred voltage noise PSD (if I calculated correctly.
Bruce wrote:
Something like an annular ring capacitor that insulates the BNC body from the
chassis whilst capacitively shorting it to the Chassis at RF ??.
Followed by a freeite sleeve/bead arround the connector body or the coax
connecting the signal from the connector to the PCB?
Back in the
On Fri, December 18, 2015 6:11 pm, Charles Steinmetz wrote:
> If you're careful with what goes on inside the box you won't
> *cause* any circulating ground current.
You are going to get at least a little circulating ground current because
of power supply parasitics, and for equipment running from
Amp (now Tyco) did introduce them. Called "Decoupled Connectors'' Info at
http://www.te.com/usa-en/search.html?q=Decoupled%2BConnectors&source=header
Tyco parts 413476-2 and 5413476-2 are available from Mouser, maybe Digikey
as well
Cheers,
Dave M
Chris Caudle wrote:
On Fri, December 18,
Hi
Well, if you are going to the angular ring microwave capacitors, you might as
well go to the
whole tubular filter approach to building the decoupling structure. The real
question is if 100 GHz
is a high enough frequency to consider or if you need to go higher….
Bob
> On Dec 18, 2015, at 6:
All the inputs and outputs were deliberately transformer isolated. Why
break the isolation by using capacitor from coax shield to chassis ground?
I do realize that some isolation transformers have "extra floating turns"
to give transformer action that cancels capacitive coupling. I don't think
the
On Fri, December 18, 2015 4:50 pm, Bruce Griffiths wrote:
> On Friday, December 18, 2015 12:27:33 PM Charles Steinmetz wrote:
>> It is perfectly possible to ground coax connector bodies at RF
>> without grounding them at power-line frequencies
> Something like an annular ring capacitor that insula
All the inputs and outputs were deliberately transformer isolated. Why
break the isolation by using capacitor from coax shield to chassis ground?
I do realize that some isolation transformers have "extra floating turns"
to give transformer action that cancels stray capacitive coupling. I don't
thi
On Friday, December 18, 2015 10:46:46 PM Anders Wallin wrote:
> Thanks for all the useful comments!
> Things improved quite a bit just by wrapping the (insulated) board in
> aluminium foil:
> http://www.anderswallin.net/wp-content/uploads/2015/12/alufoil_and_battery.p
> ng
>
> Op-Amps:
> Maybe it
On Friday, December 18, 2015 12:27:33 PM Charles Steinmetz wrote:
> Poul-Henning wrote:
> >A significant reason for the TADD-1 existing in the first place was to
> >break groundloops. This is incompatible with tying all the BNC's together.
>
> It is perfectly possible to ground coax connector bod
An initial gnuradio GRC flowgraph for measuring Time Intervals, and
dumping raw binary to a file is now on github. There are two helper
Python files: one to convert from binary to floating-point-ASCII-text,
and another to take that from raw measurements to Time-Intervals.
That file can be sent st
Thanks for all the useful comments!
Things improved quite a bit just by wrapping the (insulated) board in
aluminium foil:
http://www.anderswallin.net/wp-content/uploads/2015/12/alufoil_and_battery.png
Op-Amps:
Maybe it wasn't clear enough on schematic, but I used the AD8055 (as in
TADD-1). The TL0
Poul-Henning wrote:
A significant reason for the TADD-1 existing in the first place was to
break groundloops. This is incompatible with tying all the BNC's together.
It is perfectly possible to ground coax connector bodies at RF
without grounding them at power-line frequencies (and expected
On Fri, December 18, 2015 3:38 am, Poul-Henning Kamp wrote:
> A significant reason for the TADD-1 existing in the first place was to
> break groundloops. This is incompatible with tying all the BNC's
> together.
Assuming you mean power line frequency currents flowing between equipment,
the way te
When I used a Lead acid battery as a low noise and isolated power source I
raided the kitchen. Put the batter inside
a polyethylene container they type with a 'snap tight' lid. Then found in
my junk a nylon barb to threaded fitting and
some Tygon tubing to create an external vent. In another junk b
In message <5673c1bd.6070...@rubidium.dyndns.org>, Magnus Danielson writes:
>It seems like the biggest problem for Loran-C is that they have not been
>able to build an economical model to support it. That it complements the
>GPS and GLONASS systems, as well as GALILEO in a somewhat diff
One of my other hats involves advising electronics scrap and
recycling companies, and the repair of all manner of electronics
equipment.
In all of the equipment I have rummaged through I can state the
following without reservation:
I have never seen any sign of damage caused by properly float ch
In message
, "Dr.
David Kirkby (Kirkby Microwave
Ltd)" writes:
I belive in the instant case Lead-Acid was used as a noise-free power
source rather than as backup.
>If do, I believe that the choice of a lead acid battery is a poor one. I
>believe that even the sealed ones release very
It seems like the biggest problem for Loran-C is that they have not been
able to build an economical model to support it. That it complements the
GPS and GLONASS systems, as well as GALILEO in a somewhat different mode
disturbance is a technical detail which doesn't ripple though the reports.
one of the most important spec is the channel to channel separation. Do you
have done some measurements?
Luciano
www.timeok.it
On Thu 17/12/15 20:44 , Anders Wallin wrote:
> First prototype assembled today, tested with 12 VDC SMPS wall-wart supply
> and with 12 V lead-acid battery.
> Compar
In message <17836e4f4318bf8d2e5b6028224a0068.squir...@email.powweb.com>, "Chris
Caudle" writes:
>A better layout would be to have the power and input connectors on the
>same side of the PCB as the output connectors, and make provision for all
>of the connectors to be snugged down tight
On 17 Dec 2015 21:00, "Anders Wallin" wrote:
>
> First prototype assembled today, tested with 12 VDC SMPS wall-wart supply
> and with 12 V lead-acid battery.
> Anders
Is the lead acid battery supposed to be there so the unit continues to
function if power is removed?
If do, I believe that the c
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