> I think it's about time to retire my old former cell site GPSDO.
> Technology has improved and I'm thinking of setting up a Raspberry Pi based
> ntp server for the local devices. (I also have some spare Pi's, so...)
> Does anyone have any suggestions for a good solid Pi/GPSDO setup and code
Hi Ed:
You might surf the Accessories Catalog for Impedance Measurements.
https://www.keysight.com/us/en/assets/7018-06727/brochures/5965-4792.pdf
They have a number of SMD fixtures for 4-terminal pair LCR meters.
https://prc68.com/I/Z.shtml#KeyDocs
--
Have Fun,
Brooke Clarke
Bob,
You may be thinking of Dishal's method.
<
https://www.johansontechnology.com/dishal-bandpass-filter-tuning-using-lasertrim-chip-caps>
-John
-Original Message-
From: Bob kb8tq via time-nuts
Sent: Thursday, May 26, 2022 10:18 AM
To: Discussion of precise time and frequency
On 5/26/22 8:18 AM, Bob kb8tq via time-nuts wrote:
Hi
The real answer to the problem is to dig into the bowels of 1940’s electronic
craft.
There are various methods for setting up an L/C filter. You short this / open
that sweep
to find a dip or a peak. You move it to the “right” place. Just
Hi
That’s one of the methods. There are others for various filter topologies. Some
are
more practical than others …
Bob
> On May 26, 2022, at 9:27 AM, John Lofgren
> wrote:
>
> Bob,
>
> You may be thinking of Dishal's method.
> <
>
Hi, Lords of Time!
(Been a lurker for many years, just know too little to add but am always
fascinated by your discussions. It almost reads like theological
discursions at some points, it gets into such fine and abstruse points!)
I think it's about time to retire my old former cell site
On 5/26/22 8:24 AM, Richard (Rick) Karlquist wrote:
The tweezers are really good *only* for single components - even if they
come with test leads, that's for measuring something like a motor start
capacitor.
I tried using tweezers (cheap ones to be sure) to measure a moderately
complex
Am 2022-05-26 17:24, schrieb Richard (Rick) Karlquist via time-nuts:
VNA's of any kind (no matter how small their size) don't work well on
components that are too far away from 50 ohms, at least if
you make a simple minded s11 smith chart measurement. There
are complicated work-arounds for
Google (other search engines are available :-) DISHAL Filter Tuning
Very neat and quick way to tune up a filter using just return loss.
Doesn't even require a VNWA.
Andy
www.g4jnt.com
On Thu, 26 May 2022 at 16:40, Bob kb8tq via time-nuts <
time-nuts@lists.febo.com> wrote:
> Hi
>
> The real
Hi
The real answer to the problem is to dig into the bowels of 1940’s electronic
craft.
There are various methods for setting up an L/C filter. You short this / open
that sweep
to find a dip or a peak. You move it to the “right” place. Just what you do
depends
very much on the filter design.
I have had good results with the LCR Research tweezers.
Search "LCR Research" on Amazon. They work great on
anything you can pick up or probe with tweezers.
The general disclaimer on any kind of component measuring
device is:
Virtually all of them are ONLY suitable for measuring a
On 5/25/22 3:16 PM, ed breya via time-nuts wrote:
Thanks Mike, for info on LCR alternatives. It's good to know of others
out there, if needed. I have an HP4276A and HP4271A. The 4276A is the
main workhorse for all part checking, since it has a wide range of
LCZ, although limited frequency
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