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Измерение параметров КФ с помощью NanoVNA
Настройка кварцевых фильтров с помощью NanoVNA
Измерение кварцевых фильтров с помощью NanoVNA
Как проверить кварцевый фильтр с помощью NanoVNA
Measurment crystal filter for NanoVNA
NanoVNA в качестве АЧХ метра
Проверить КФ прибором NanoVNA
Измерение АЧХ кварцевых фильтров
Измерение параметров кварцевого фильтра
Изготовление КФ
Настройка КФ
Лестничный фильтр
Шестикристальный КФ
Восьмикристальный КФ
QER фильтр
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  • ruRussian
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00:00:06
Hello everyone, in this video I want to
00:00:09
tell you how, with the help of a Chinese
00:00:11
device,
00:00:12
she has long been called it or na na
00:00:16
v.n. hey, maybe it would be more correct
00:00:19
in general, as soon as it is not called,
00:00:20
control and measure
00:00:23
quartz filters,
00:00:24
well, respectively, antenne and so
00:00:27
on, but in this case in this video
00:00:29
it interests me most and we
00:00:32
will consider exactly the process of
00:00:34
measuring quartz filters, that is, the
00:00:36
sneeze of quartz filters is assumed,
00:00:40
of course, you know how to use it,
00:00:43
at least let’s say at the initial level, so
00:00:47
you’ve already calibrated it, it’s
00:00:51
calibrated for you, that is, you should already know
00:00:52
how to calibrate it on the Internet, there’s a
00:00:55
lot of information on this matter and
00:00:58
there are videos and there are manuals in
00:01:01
Russian, by the way, manuals in
00:01:04
Russian for this device, I’ll post it under
00:01:07
the video, you can watch it and, in
00:01:10
fact, use them in free
00:01:13
flight everywhere on the Internet, so I’ll just
00:01:16
post them under the video so that everything is
00:01:18
said together, everything is clear and
00:01:20
you could download them so that there would be no
00:01:24
questions, which means there are a lot of translations of these
00:01:30
outside of mine,
00:01:31
they were already translated before me, so
00:01:35
you can take them and use them, and so
00:01:38
the device is ready for work, we will need,
00:01:42
of course, to make a simple stand for this,
00:01:44
or an adapter, it is also called
00:01:46
in general then it doesn’t matter which one can
00:01:50
easily connect both the device and the filter being tested,
00:01:53
this
00:01:56
means that what is
00:01:59
an adapter or, let’s say, a stand, a
00:02:02
simple handkerchief that can be
00:02:06
literally cut out by hand, if you can see it, that
00:02:10
is, that we have ordinary one-sided
00:02:12
fiberglass, here are the cut out areas
00:02:17
for the sma connector, the connector has been washed away his
00:02:23
connectors are from mom, mom, because all
00:02:26
our cables have a dad, here is dad, mom,
00:02:30
that is, these connectors can be easily
00:02:33
bought there on aliexpress, your own
00:02:36
link to the connector, and I can also give you a link to the
00:02:39
device, and there
00:02:41
will be a link to the connectors where exactly from which
00:02:44
seller you can will buy
00:02:47
this device and these connectors
00:02:50
before I want to immediately briefly say that the device
00:02:53
and they are now coming in several
00:02:57
modifications, they are different, there are
00:03:00
white devices in a white case, there are
00:03:03
black devices that already
00:03:06
have a battery, shielded
00:03:08
inputs and outputs, and so
00:03:11
it is believed that its own this device name is
00:03:13
more or less a good device, the seller is a
00:03:17
very responsible comrade, literally
00:03:20
two weeks after ordering, I
00:03:23
received this device and in general I am
00:03:25
satisfied, which means, well, everything
00:03:29
is clear about the device, all this can be found on the Internet and
00:03:30
I will post links to specific
00:03:32
sellers not as an advertisement, but just so
00:03:36
that there are no questions, give a link and
00:03:38
the like, that is, I don’t mind
00:03:39
using it, so this is the adapter
00:03:42
we make the simplest printed circuit
00:03:44
board, I also have it for this adapter,
00:03:47
I also posted it, in this case, I
00:03:49
actually just cut it out with a knife
00:03:52
I had such a knife, I just cut out these
00:03:56
pads, it’s all faster and
00:03:59
more convenient, in fact, I soldered all the
00:04:02
connectors and now we have a
00:04:04
convenient adapter ready for testing any
00:04:07
quartz filters, in this case, I’ll
00:04:11
show you how we’ll measure
00:04:14
for a start, here and the filter before pr filter
00:04:20
or
00:04:21
kir filter is called a filter, yes, that is, in
00:04:25
general, some of the beginning radio amateurs
00:04:28
can also look through the Internet
00:04:30
to see what kind of filter it is and on
00:04:32
filters I will have a separate video
00:04:34
review where I will basically tell you what
00:04:38
filters there are and how to calculate them correctly
00:04:39
what kind of
00:04:42
devices, devices and materials are needed for this, and so
00:04:44
on, but in this video, in general, the topic is
00:04:48
basically about the process
00:04:50
of measuring these filters, so first of all, I’ll
00:04:54
show you how you can check
00:04:58
this filter here, this is how you
00:05:01
can see it on the device it’s a sneeze,
00:05:04
actually I’ll show you what’s the xygr filter of
00:05:09
this one
00:05:10
and I’ll show you what’s the x6 of the
00:05:13
Chebyshev crystal ladder filter,
00:05:15
so you look at how they differ from each other,
00:05:19
after that we’ll
00:05:23
try and practically see
00:05:25
how to do it, how to make
00:05:27
measurements by first taking a little
00:05:31
ahead, I will tell you that before, in
00:05:34
general, we will measure this filter for
00:05:37
whom we already have the calculated ones, it is
00:05:41
naturally soldered,
00:05:43
that is, soldered, according to the calculations from the
00:05:46
program, it was breathing, there is such a program in the
00:05:50
upcoming video review, I will tell you everything
00:05:52
about this the program means
00:05:56
we have this calculation
00:05:57
graph on this graph, we indicate the
00:06:00
average frequency, the lower and
00:06:03
upper frequencies are indicated,
00:06:04
that is, we already know the middle part, the
00:06:06
frequency, that is, the central frequency and
00:06:08
we know the lower frequency and the upper frequency,
00:06:11
and what that is, the lower upper and the lower
00:06:16
slope of the upper scada filter, we also
00:06:19
know what its input
00:06:22
and output resistance is, that is, 280 m. Well, right away I want
00:06:26
to say that about this device,
00:06:27
in order to see, in principle, it’s easy to see
00:06:30
from the sneeze of this filter such as, let’s say,
00:06:34
as we have here on the graph, but in principle,
00:06:37
not even completely and it is necessary
00:06:38
to stick directly to 200 there, 80 there or
00:06:41
how many in this case I have
00:06:43
put resistors in place,
00:06:45
but let’s say purely symbolically
00:06:49
when you already understand during the
00:06:52
measurement process why this is exactly how I can
00:06:54
set it, of course, 280, that is, the calculated
00:06:57
value of the picture is not very it won’t change,
00:07:00
believe me, I tried it and the only thing
00:07:03
I need to do is just increase
00:07:05
the sensitivity a little, but I
00:07:06
’ll tell you about that further, that is, in principle,
00:07:10
this simple test stand suits us
00:07:12
100%, but that is, we calculated
00:07:15
this filter, you saw what
00:07:16
frequencies we should have to get
00:07:19
approximate frequencies, that means if
00:07:22
you can see it, you can see it in this way,
00:07:27
and based on this
00:07:31
calculation, we begin to take measurements, that
00:07:35
is, we turn on the device and now I will
00:07:39
show you and sneeze this filter,
00:07:41
and I immediately want to say that I have
00:07:44
so far There is this stylus, a pencil that is not
00:07:47
very sharpened, it
00:07:49
works great with it so you don’t have to poke the
00:07:52
rather small buttons here with your fingers, in any case,
00:07:53
for me, I came up with such a stylus,
00:07:57
well, such a quick option,
00:08:00
now I’ll try to zoom in and sneeze
00:08:02
this filter and you will all see this
00:08:04
picture like the textbook says the
00:08:08
classic version,
00:08:12
so here we see a classic
00:08:14
picture, just like in the alphabet book and just like in the
00:08:18
filter textbook, the picture is beautiful, the filter is done
00:08:25
correctly, in general, I think, in general, the
00:08:30
filter works great, that is, there is
00:08:33
practically no need to do any other adjustments here,
00:08:36
like this one change the picture, bring it
00:08:39
closer, let’s say it’s more
00:08:42
pleasant, maybe visualization, maybe someone
00:08:45
needs a narrow panorama, maybe there are
00:08:48
tails somewhere along the length and leave
00:08:51
it all so that you can see what
00:08:53
harmonics are there next and others are coming, I
00:08:56
’ll tell you this a little further, but in
00:08:59
this In this case, you must understand that a
00:09:01
picture like this is, in general,
00:09:05
everything possible and obtained with this device,
00:09:08
and we see that this device can be
00:09:10
used perfectly to measure the
00:09:13
sneeze of quartz filters, their settings, that is, this is
00:09:15
what, in general, I was
00:09:18
striving for. what I wanted to achieve and
00:09:21
in this case,
00:09:22
let’s say I use
00:09:25
made quartz filters, I
00:09:28
used a h and an oscilloscope, that is, the
00:09:31
old grandfather’s method, I thought it
00:09:35
suited me, in any
00:09:37
case, well, when, in general, I approached
00:09:40
this device, that is, I bought it,
00:09:42
tried it, but Of course, I liked it better,
00:09:44
it’s more visual, it’s more
00:09:47
convenient, and accordingly, as they say,
00:09:51
we directly see a beautiful
00:09:53
picture, and in general, this is not self-deception,
00:09:56
the picture corresponds to reality,
00:09:58
because the filter is really
00:10:00
well made, and even
00:10:03
with the help of, say, the eco number graph,
00:10:06
the picture was approximately the same but it
00:10:09
was in linear graphics and let’s not say it was
00:10:12
n’t very convenient to measure,
00:10:16
let’s say even the
00:10:19
calculated bandwidth, well, that is, here it’s certainly more
00:10:22
clear, so I resoldered
00:10:27
our kir filter, now I soldered it, which
00:10:31
means I soldered a
00:10:36
regular
00:10:37
6 crystal Chebyshev ladder filter to our meter
00:10:42
this is also a calculated filter,
00:10:45
I calculated it, I calculated it,
00:10:48
I have similar vodka leaves, I’ll show you this video,
00:10:51
everything is also calculated, everything is calculated,
00:10:55
and here it is, what it looks like, the filter itself,
00:11:00
that is, here it is, our 6 crystal chik, a
00:11:03
regular filter, as we see
00:11:11
and sneezed at it’s the same as
00:11:14
they say, as they say from the book, we have
00:11:18
unevenness at the top,
00:11:20
the unevenness is quite acceptable, how the
00:11:25
unevenness of the frequency response is calculated and calculated, and I’ll tell you
00:11:27
reviews about quartz filters,
00:11:30
but now we need to understand that there is
00:11:33
such a sneeze
00:11:35
and how it differs from the staircase years
00:11:38
sneeze filter from Kir Fedor, that is, if
00:11:41
in Kir filters we saw a clearly even
00:11:45
plane of vertices somewhere here we see
00:11:47
some unevenness and
00:11:49
the number of these arbeks approximately
00:11:52
coincides with the number of resonators, well, that
00:11:55
is, we see a classic picture,
00:11:57
no more no less, this is good, that is
00:11:59
this means that our filter
00:12:01
works, not only does it work, it is
00:12:04
absolutely
00:12:05
included in the calculated parameters, that is,
00:12:08
we have a band that
00:12:10
we calculated in this case to be three kilohertz
00:12:11
and calculated 3 kilohertz clearly, we have a
00:12:15
device that shows this device
00:12:18
shows us this
00:12:20
bandwidth filter,
00:12:22
this is already good, the filter
00:12:24
itself coincided almost
00:12:27
one hundred percent according to the calculations, which in general makes me very
00:12:30
happy in this regard, that is, this filter is
00:12:34
ready for work and it will
00:12:36
work well in fact, such a conclusion,
00:12:39
so I showed you now
00:12:41
demonstrated in principle how can you
00:12:43
visually display the x-axis using
00:12:46
this device, how can all this be measured,
00:12:48
and now we will, in principle, come
00:12:52
directly to the process, how this can be
00:12:55
done, what should be the
00:12:57
preliminary settings, and in
00:13:01
general, what are the subtleties and nuances in
00:13:04
terms of display directly
00:13:07
pictures on this small
00:13:09
monitor, checks of the device,
00:13:10
of course there are some nuances about which I will
00:13:13
now tell you
00:13:15
not how to set up how to set up
00:13:18
the device for measuring quartz and
00:13:21
filters so that it is
00:13:23
comfortable, they say comfortably
00:13:26
present us with a picture on this
00:13:29
display so that we can see everything
00:13:32
all his sneeze tails from a sneeze and so on
00:13:35
we will carry out this measurement this
00:13:38
end-to-end measurement is an analogue or
00:13:41
prototype of the same measurement
00:13:44
using a sweep
00:13:47
frequency generator and an oscilloscope means that we
00:13:52
have as a quality as a
00:13:55
member we have one channel that is, we have a
00:13:58
sweeping frequency generator and
00:14:01
as an oscilloscope we have a 0 h
00:14:06
zero channel, yes, that is, in general, the
00:14:10
meaning is the same, the principle is the same, only
00:14:13
the switching is a little different and it is more convenient
00:14:15
to tell us here than it would be done there
00:14:18
with with the help of some kind of connector there and how
00:14:20
to synchronize
00:14:21
us there and a lot of this and that,
00:14:24
all of this is of course dreary and, well, for
00:14:27
me in general it’s labor-intensive, although I
00:14:30
already had it all debugged, everything is fine, but
00:14:32
here it’s still more convenient and so that don’t
00:14:35
get distracted by these little things,
00:14:37
what are we doing, what settings of the device in
00:14:40
this case do we need, well, in addition to the
00:14:43
setting that was driving above, that the device
00:14:46
should already be calibrated, how to
00:14:48
calibrate it, there are now a lot of
00:14:50
tips on the forums, there are videos, and so
00:14:54
on, if suddenly they couldn’t find it and
00:14:57
so on, write in the comments I
00:15:00
will definitely try, if
00:15:03
it is in demand, lay down a lesson on
00:15:05
calibration and so what we do to
00:15:09
begin with, I will set up the graphs for
00:15:14
channel zero, that is, I chose channel 0,
00:15:20
say the yellow yellow graph,
00:15:25
you can see here, I’m showing you I put it there’s a
00:15:28
Smith chart on it, well, don’t pay attention to that for now, I’m sweeping away
00:15:32
the diagram and I don’t
00:15:34
remove it, I just like it and, in
00:15:36
principle, I use it and that’s why I don’t
00:15:39
remove it, it doesn’t bother me, these
00:15:41
lines here, if someone is prevented from removing
00:15:43
the Smith chart in principle it’s easy and leave
00:15:45
only one graph, well, it doesn’t matter, the essence of
00:15:48
the question is that I’ll say the blue channel,
00:15:51
this one, which we have in the
00:15:53
trace settings, there are settings, I left the blue
00:15:56
channel for a logarithmic scale, so
00:16:01
how do I do this, I select the display here
00:16:05
we have trace I select the blue channel
00:16:08
blue channel active network blue beam here
00:16:12
it lights up here the cube backlight of
00:16:16
this channel it is active in this
00:16:18
channel I will make all the
00:16:20
possible changes that I need, that
00:16:22
is, I leave here on you
00:16:25
should already know this here here is in
00:16:27
this menu, if you go to the main
00:16:31
menu we have and here we go
00:16:34
to the display here in this menu we have
00:16:36
a format here here we can
00:16:38
choose which one to logarithmic format
00:16:41
let's say then we measure SWR there
00:16:44
or what the Smith chart we can hang everything we need
00:16:47
on this
00:16:49
particular channel that we have selected
00:16:51
here, that is, in the trace menu, tracing and it
00:16:55
can be translated like this, well, we do
00:16:59
n’t care that much, that is, there is a certain menuet, are
00:17:01
n’t we selecting our channels with our
00:17:03
roughly speaking rays,
00:17:05
if we take this even as an oscilloscope,
00:17:07
we draw an analogy, we chose a blue beam
00:17:09
and for it we select measurement methods
00:17:13
and what we specifically need to measure, what
00:17:16
school we will have, and so we chose all this
00:17:19
further, arithmetic and in
00:17:25
this channel in the blue Dawood
00:17:27
we have chosen the blue channel, which means we have a
00:17:31
logarithmic scale, then we go,
00:17:35
exit from here, then we need to set
00:17:41
the limits of the generator swing, the limits of the
00:17:45
generator swing and the swing means what we
00:17:48
do, we go to the main menu, here
00:17:52
there is a menu under the menu as a stimulus,
00:17:56
go here and here we see
00:17:59
there is a start and there is a stop, that is, we set the
00:18:03
lower limit of the frequency and here stop
00:18:06
we set the upper limit of the swing frequency of the
00:18:09
generator of our Sochi,
00:18:12
all this is set very simply, so
00:18:14
we press start in this case I have a
00:18:17
filter of 8 eight hundred sixty seven
00:18:20
eight point eight hundred sixty seven
00:18:22
thousandths of
00:18:24
megahertz, well, that is, this is a standard
00:18:27
filter, this is a standard frequency that, in
00:18:29
general, radio amateurs have chosen
00:18:32
and make on these boats, I
00:18:36
already showed you
00:18:38
all these filters on these boats, well, in principle, a good
00:18:40
option, why, because the band
00:18:43
is really three kilohertz I got
00:18:47
this band without any problems, everything is very beautiful
00:18:50
and works great, so these
00:18:52
quartz and in general really
00:18:55
justify themselves, well, then this
00:18:57
specifically concerns the quartz filter, and so
00:19:00
we set the starting
00:19:02
frequency, it’s clear how we set it, that
00:19:04
is, who already I used this device,
00:19:06
here we click on the white field,
00:19:08
here we set it there 8 861 ok ok ok and everything
00:19:14
was set to give it,
00:19:17
I’ll even show it here 88 court
00:19:21
61 megahertz letter in chic here it is, the
00:19:26
starting frequency is set and
00:19:28
now we set the final frequency,
00:19:30
we come here again
00:19:32
stop here a8 871 also we ourselves come here
00:19:38
along the white field 8 871 meyers we put all the
00:19:45
water ones we got the final frequency there is a recalculation in progress
00:19:47
some delay
00:19:49
in the display of the picture the picture has recalculated
00:19:51
the axes so we see this frequency but that’s
00:19:56
all good but it’s kind of long and tedious
00:19:58
right there is a more interesting way
00:20:02
more fast and in my opinion absolutely the
00:20:06
same, in general, optimal means
00:20:09
since we already have the calculated data for
00:20:11
this filter and we know perfectly well the
00:20:14
central frequency of this filter,
00:20:16
we know it from the calculated data, we
00:20:19
just go to this same menu and in
00:20:22
this menu we have there is some
00:20:24
interesting thing center center our center here it is
00:20:28
808 866 8 point eight hundred sixty
00:20:32
six thousand or rather meyers
00:20:36
frequency this is our central frequency for the
00:20:39
calculated one then we immediately set it here
00:20:42
everyone set the center here
00:20:44
it is, now we go to
00:20:49
span there is such a spam item that is, this is the
00:20:51
bandwidth of the filter, well,
00:20:55
in order for us to see not just the shape of the
00:20:59
filter itself, but also to see some
00:21:01
tails that it leaves for
00:21:03
the harmonic, and so on, of some order, it does
00:21:05
n’t matter, but of course we need to
00:21:08
take it wider, but here 9,999 Well, I
00:21:12
’ll take it there 10 megahertz 10 kilohertz,
00:21:14
or rather, 10 kilohertz clap and we
00:21:18
actually get a pretty
00:21:20
interesting picture without any VVS, that is, there is no
00:21:24
need for any body movements to set the
00:21:26
starting final frequency, etc. and so on.
00:21:29
that is, we know the calculated data, we
00:21:31
set them right away, that is, I can
00:21:34
show them again even in this way and we can
00:21:37
narrow or expand this graph a little,
00:21:39
we take the spam bandwidth up to
00:21:42
and make it there not 10 so that the allowable ones can be
00:21:46
expanded, but let’s say 5 kilohertz to 5
00:21:50
kilohertz, let's take the winter, so that is,
00:21:52
we get a wide graph here, we
00:21:54
can now look at the peak in more detail,
00:21:57
there we can beat off even
00:22:00
approximately these -3 decibels at the level
00:22:03
that we usually measure,
00:22:05
well, the level at which we measure the
00:22:07
bandwidth, so our own
00:22:10
calculation is underway at the level of
00:22:12
exactly -3 decibels of bandwidth, but
00:22:16
again, this is about filters, I’ll tell you everything,
00:22:18
that is, as you can see here, you can
00:22:20
just change these spam parameters,
00:22:23
you can clearly visualize the picture
00:22:26
as you like, let’s take 15 kilohertz,
00:22:29
we’ll narrow it down, and you’ll end up with a
00:22:33
picture like this well, beautiful,
00:22:35
ugly, but in any case, we see
00:22:38
even more tails that we
00:22:40
still have dressed there, that is, in this
00:22:44
way we can vary in terms of
00:22:46
visualization, so there is also a
00:22:49
parameter that we really
00:22:51
need here when taking measurements, let’s say the
00:22:54
sensitivity parameters and for this
00:22:57
This sensitivity is answered by
00:23:00
such a parameter as the scale of the div,
00:23:03
how to go there, then we also go out to
00:23:07
the display,
00:23:08
here we see the display, our parameter here is
00:23:12
the scale opened
00:23:14
and the scale of the div, this is the parameter I
00:23:21
generally won’t visit the video so I have
00:23:24
n’t really seen it so much illuminated and it is
00:23:26
quite important than it is in general, then
00:23:30
this parameter is important,
00:23:32
look, if we say this filter is
00:23:35
designed, everything is fine, the picture is beautiful,
00:23:38
yes, but it has some attenuation in the
00:23:42
passband and the attenuation can
00:23:45
be very significant, and
00:23:47
this attenuation is also influenced by our
00:23:50
load resistors, that is, the load,
00:23:52
these are the resistors that
00:23:54
are installed on the dress in us, in this
00:23:58
case, I don’t have a table, but these
00:24:00
resistors are about, but they can be there 200 for
00:24:04
you 300 and so on, it all depends on what the
00:24:08
input and output resistance of your quartz
00:24:10
filter, the calculation for here and here,
00:24:13
of course, the level will differ sharply,
00:24:16
so in any case we will have to
00:24:18
set some levels
00:24:20
as a send to the raf, we turn the volt knob in a circle
00:24:23
by division up to this one, that is,
00:24:27
we set the sensitivity here too,
00:24:29
by analogy, we should set this
00:24:31
sensitivity to see the picture,
00:24:34
well, more or less let's say, the height is
00:24:38
acceptable so that we can
00:24:40
track all these parameters,
00:24:43
so what we are doing is changing,
00:24:47
I have it set to 13, yes, well, these are most
00:24:50
likely conventional units,
00:24:52
frankly speaking, so as not to mislead you,
00:24:54
I’m drawing an analogy with an
00:24:58
oscilloscope, well, let’s say 13, and it’s not
00:25:03
a fact that it’s 13 millivolts per
00:25:06
division cell and so on, although
00:25:09
maybe this will still need to be read
00:25:11
from the English manual what it is after
00:25:14
all means specifically whether it’s
00:25:18
the pain of dividing into a cell or whether it’s in
00:25:21
general, some of them are not there, let’s say
00:25:24
Chinese units, but the point is not important, the point is
00:25:27
that let’s say if we choose
00:25:29
a five, we chose 5 to
00:25:32
click on multiply by 1 here in one
00:25:35
cells, well, that's what this is, the 5th one, we
00:25:38
see our graph has dropped to God knows
00:25:40
where, of course we can expand this
00:25:42
part as I showed you before and
00:25:45
track track specifically here, well, I
00:25:47
think this graph will not help us much,
00:25:49
so I naturally set it so that It
00:25:55
was convenient for me to look at the entire graph and
00:25:57
tails and everything else, so here,
00:25:59
let’s say from if I put 15,
00:26:02
let’s say the same one, then our graph
00:26:05
will rise much higher much higher, I can
00:26:08
already see its tails,
00:26:10
you can see if this is acceptable, an oscilloscope
00:26:13
if we take Suvorov then here
00:26:16
we have the middle and bottom line, it
00:26:19
will not rise, the overall
00:26:22
sensitivity will change, the graph itself will
00:26:24
become larger and smaller in height until,
00:26:26
but here in this case, somehow there is also a
00:26:29
shift along the axis,
00:26:30
well, in general, this is a topic for further
00:26:34
discussions perhaps in the comments
00:26:36
you may be dressed a little bit and didn’t understand,
00:26:41
let’s say correct me too, but the fact
00:26:44
remains this way, so I
00:26:46
put 13 in this case, it’s more
00:26:50
interesting to me, more suitable, I see in
00:26:53
this case everything is fine, here
00:26:55
we see the whole graph of the bottom part
00:26:57
we also clearly track the tails and the upper part,
00:27:00
and in general, in this
00:27:03
way, everything can be
00:27:05
visualized normally. We exit from this menu and
00:27:09
see our check is lined up like this, and sneeze
00:27:14
on the device, we naturally need to
00:27:16
measure
00:27:17
certain of its parameters correctly, that
00:27:20
is, confirm our calculated the data
00:27:22
has fallen off or didn’t fit into this calculation,
00:27:25
so I’ll expand our graph a little
00:27:29
and so we got the picture, the picture is
00:27:33
acceptable, everything is fine, now we
00:27:35
need to check the parameters of
00:27:40
our filter, that is, do
00:27:42
they correspond to the calculated data,
00:27:44
what do we do for this on our
00:27:47
device there is such a wonderful but
00:27:49
functional joystick, then with the
00:27:53
help of this joystick we can move
00:27:55
the arrow back and forth,
00:27:59
that is, we can move along our
00:28:02
path, moving according to our eyes, but we
00:28:07
set the starting frequency
00:28:09
approximately, but here somewhere like this it
00:28:12
will be minus 30 for white, let it
00:28:15
be minus 6 decibels, well, actually, it’s
00:28:18
not even that important, but let’s say here
00:28:20
here we see the extreme frequency,
00:28:22
excuse me, my eyesight is not very good, but here it is
00:28:25
extreme, and my frequency is 8 8 point
00:28:28
eight sixty-four 864 900
00:28:33
megahertz, that is, well again, this is not so
00:28:36
important, that is, we have detected this frequency,
00:28:38
we move here forward along the x axis to the
00:28:44
upper cattle, which means we have come here, we
00:28:48
will move it a little like this somewhere up to y, that
00:28:51
is, we jump a little,
00:28:55
we jump a little with the arrow for unevenness, that
00:28:58
is, we do not accept uniformity
00:28:59
the unevenness of this peak, we don’t
00:29:01
take into account, we just lower it, it will sit down
00:29:04
by about -3 decibels, but
00:29:06
it gets out, but well, of course, we can
00:29:10
expand
00:29:12
our sneeze diagram even more precisely and set it even more accurately,
00:29:14
but again, this is not important
00:29:17
because I know that the calculation in principle,
00:29:20
plus or minus there are 10-15 percent if
00:29:24
there are discrepancies, but this is extremely unimportant
00:29:26
for amateur
00:29:28
designs, that is, this calculation,
00:29:31
this device and this chica that we
00:29:33
now see for our amateur radio
00:29:36
purposes, it absolutely suits us and we don’t have to
00:29:38
bother with any there
00:29:40
the precision is in microns
00:29:42
and so on, I don’t know,
00:29:45
tiny deviations don’t make any
00:29:48
sense, believe me, especially when you
00:29:50
put this filter in a functioning
00:29:52
device, there will be so many more nuances
00:29:55
that need to be coordinated correctly,
00:29:58
drive it into some kind frequencies of the
00:30:02
cinema of the lower slope and so on and so forth, something
00:30:04
like this, all the work on
00:30:08
measuring these precise
00:30:11
calculations and so on, they make
00:30:13
absolutely no sense, look at the
00:30:15
final frequency of 8,868, we detected
00:30:21
this frequency, recorded this frequency, everything is ok, then just
00:30:24
simply from the final frequency we subtract the
00:30:27
initial frequency on the calculator
00:30:29
whatever you want and we get the
00:30:31
passband of this filter, the real
00:30:34
passband of the filter at a level of -3
00:30:37
decibels, that is, we all measured this
00:30:40
with calculations, everything came together clearly 3
00:30:42
kilohertz there 293 well, that’s even 31 well, as
00:30:47
if for ssd is absolutely normal,
00:30:50
that is, I showed you how to measure it all, the
00:30:53
only small drawback, of course, is, well, it’s a little small, a
00:30:54
little small, you see,
00:30:57
I’m
00:31:00
looking at the whole thing with a magnifying glass, and so in general, for
00:31:03
specific laboratory studies of some kind,
00:31:06
this filter is quite suitable
00:31:08
It’s absolutely enough, of course, to
00:31:11
understand all this in more detail, how it all
00:31:14
happens and why exactly you need to
00:31:16
learn how to calculate how to make a
00:31:18
filter,
00:31:19
of course, be sure to subscribe to the
00:31:23
channel, leave your comments, so with
00:31:26
that, thanks to everyone who
00:31:29
watched this video to the end, and
00:31:32
accordingly, bye to everyone and see you again
00:31:34
meet in the next videos

Description:

Измерение параметров кварцевого фильтра с помощью прибора с AliExpress NanoVNA - НаноВНА. Ссылка NanoVNA - H в корпусном исполнении: https://ali.ski/v7lail Здесь можно купить NanoVNA-F: https://ali.ski/qefGR Ссылка где купить разъемы SMA_Папа под RG58: https://ali.ski/HbL-b Ссылка где купить разъемы и переходники для антенных измерений: https://ali.ski/lwMCC Кварцы на 8.192 мГц: https://ali.ski/f6e3yz Ссылка на джойстик для прибора: https://ali.ski/qs2QPx Регулируемый лабораторный блок питания, 30 В, 10 А, продавец надежный: https://ali.ski/VaHnO Цифровой измеритель КСВ и мощности, УКВ 125-525 МГц, я таким пользуюсь, продавец надежный: https://ali.ski/-9pT5 Паяльный набор для радиолюбителя, очень рекомендую, продавец проверенный: https://ali.ski/boj7Xg Паяльник автономный 50вт., питается и заряжается от USB интерфейса, продавец надежный: https://ali.ski/TLcF_2 Оказать посильную помощь на развитие канала: https://www.paypal.com/donate/?hosted_button_id=JHK52D4NXCMJE Группа в телеграмм. https://t.me/Radio_and_Elektronika Заходим, задаем вопросы, общаемся. Сайт для радиолюбителей: https://lessonradio.narod.ru/ Сайт для любителей аудиотехники: https://devicemusic.ucoz.ru/ Форум: https://devicemusic.ucoz.ru/forum/

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