April 2020 22:56
To: time-nuts@lists.febo.com
Subject: Re: [time-nuts] Using speaker / earphone for PPS testing (not a
question)
Timenuts, Gentlemen, hello!
I would like to make my little contribution to this discussion showing how I
implemented my solution in my built PRS10 Box.
For PPS and 1
Hi
Well, actually it should work. You are doing an “impulse response” on the
speaker.
As long as it has a response in the audio range (which is a good bet), it
should make
some noise.
Bob
> On Apr 22, 2020, at 3:57 PM, Taka Kamiya via time-nuts
> wrote:
>
> Bob? Are you making "Big Ben"
Timenuts, Gentlemen, hello!
I would like to make my little contribution to this discussion showing
how I implemented my solution in my built PRS10 Box.
For PPS and 10 MHz reference I am running since years successfully a
Trimble Thunderbold together with the antenna fixed on the rooftop of my
hou
Bob? Are you making "Big Ben" out of your T-bolt?
Really, my original post was meant to sort of show something interesting I
happen to find. Nothing serious. Those really short pulse shouldn't be
audible but most are. I'm making a set of tools to quickly check my time
sources. That was f
Bob kb8tq - Wed, 22 Apr 2020 07:46:34 -0400
Said -
>
A lot also depends on what sort of voltage / power the speaker is expecting.
If it's a high impedance voice coil gizmo things aren't going to be as easy as
with a piezo gizmo designed to work in a 1.3V battery powered greeting card.
Where di
Hi
A lot also depends on what sort of voltage / power the speaker is expecting.
If it’s a high impedance voice coil gizmo things aren’t going to be as easy as
with a piezo gizmo designed to work in a 1.3V battery powered greeting card.
Where did I leave that 10KV output amplifier ….. should be
The thing is, the shorter the electrical pulse, the less total energy is
available
(particularly in the audio frequency range), and no amount of "echoing
around"
(which is really just a form of filtering) can fix that. So there *are*
limits.
Dana
On Tue, Apr 21, 2020 at 7:49 PM Neville Michie w
I have found that a piezo sounder, a ceramic disk with two leads for making
beepers
works quite well for very short pulses.
For a very short period charge flows into this device, which is a capacitor,
and for that duration its dimensions are changed, and when it reverts to its
original state the
om the default of 10 micro second. Their responses was no.
>>
>> Chris
>>
>> -Original Message-
>> From: time-nuts On Behalf Of Taka Kamiya
>> via time-nuts
>> Sent: Monday, April 20, 2020 22:35
>> To: Discussion of precise time and fr
> >
> > > -Original Message-
> > > From: time-nuts On Behalf Of Taka
> > Kamiya via time-nuts
> > > Sent: Monday, April 20, 2020 22:35
> > > To: Discussion of precise time and frequency measurement <
> > time-nuts@lists.febo.com>
>
; Kamiya via time-nuts
> > Sent: Monday, April 20, 2020 22:35
> > To: Discussion of precise time and frequency measurement <
> time-nuts@lists.febo.com>
> > Cc: Taka Kamiya
> > Subject: Re: [time-nuts] Using speaker / earphone for PPS testing (not a
> question
0, 2020 22:35
> To: Discussion of precise time and frequency measurement
>
> Cc: Taka Kamiya
> Subject: Re: [time-nuts] Using speaker / earphone for PPS testing (not a
> question)
>
> Out of all signal source, the shortest 1 pps is PRS-10 at 10 micro second.
> T-bolt is qu
precise time and frequency measurement
Cc: Taka Kamiya
Subject: Re: [time-nuts] Using speaker / earphone for PPS testing (not a
question)
Out of all signal source, the shortest 1 pps is PRS-10 at 10 micro second.
T-bolt is quite short as well but I don't have a definite data.
For
Out of all signal source, the shortest 1 pps is PRS-10 at 10 micro second.
T-bolt is quite short as well but I don't have a definite data.
For those, speaker method worked just fine. I'm just sharing what I learned on
happenstance.
---
(Mr.) Taka Kamiya
K
It's easy to trigger on short pulses on most oscilloscopes if you follow these
steps:
(1) Do NOT use Auto Trigger mode. Instead use Normal trigger mode.
(2) Set the vertical coupling mode to DC.
(3) Set the vertical gain (volts/div) and offset so that the baseline (OFF
voltage between pulses) and
Maybe everyone but I knew, but I just did this and found it useful.
1 pps signal from some GPS are notoriously narrow and difficult to sync on and
see on scopes. LED will barely light if some kind of stretcher is not used.
If your purpose is ONLY to see if it's there or not, hook up a small spe
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