As some of you know, I've been working on restoring a WW II LORAN-A
system. To test it, I've been using a Tektronix TDS1002 Digital 'Scope and
a Military TS-251 Test Set.
First a bit about the LORAN-A signal. It is a precisely timed Master pulse
of roughly 2 MHz RF. The spacing of the Master
Offhand, I would suspect undersampling or mistriggering
I picked up a Hameg scope with 200 megasamples/sec a few
years ago. It saved quite a bit of time when I was putting
together a parallel interface between Linux and a Tek storage tube
terminal. Push a button and a hard copy pops out of
On 06/06/11 18:40, J. Forster wrote:
IMO, the lesson is that digital scopes do not always accurately depict
what a circuit is doing. Even a $50 analog 'scope would never have this
issue.
Out of idle curiosity, what sampling mode were you using? (ACQUIRE menu
on my TDS2024B).
In SAMPLE mode,
On 06/06/11 18:57, Chuck Forsberg WA7KGX N2469R wrote:
Offhand, I would suspect undersampling or mistriggering
I picked up a Hameg scope with 200 megasamples/sec a few
years ago. It saved quite a bit of time when I was putting
together a parallel interface between Linux and a Tek storage
Aliasing (if that is indeed what's going on) can be a problem with any digital
sampling device, including your 'scope. You may find the peak detect
function in the acquire menu useful. I assume your TDS1002 has one as my
TDS2024 does. Also, perhaps the holdoff function might improve your
On 06/06/11 18:40, J. Forster wrote:
IMO, the lesson is that digital scopes do not always accurately depict
what a circuit is doing. Even a $50 analog 'scope would never have this
issue.
Out of idle curiosity, what sampling mode were you using? (ACQUIRE menu
on my TDS2024B).
In SAMPLE
Aliasing (if that is indeed what's going on) can be a problem with any
digital sampling device, including your 'scope.
Not quite aliasing, I think, but close.
You may find the peak
detect function in the acquire menu useful. I assume your TDS1002 has
one as my TDS2024 does. Also, perhaps
In message 43ecea5a-3360-43c0-9521-ea8b6598b...@mninter.net, KD0GLS writes:
You may find the peak detect function in the acquire menu useful.
And be particular careful with the hi-res function (like peak
only it averages all the oversampled samples)
--
Poul-Henning Kamp | UNIX since
