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When calibrating THRU, is that the double female SMA connector or something else?


Walter Egenmaier 2022/01/05 20:32

I have the OPEN, SHORT, 50 ohm resistor standards and a double female SMA connector. Is the double SMA female to female = THRU standard used during calibration or is there another something I'm missing?

Walt/WB4ZUT

Lex PH2LB 2022/01/05 23:50

The double SMA female to female is indeed used for the THRU calibration. but also used for the other calibration when using cables.

Open : NanoVNA P0/S1 - cable - female / female - OPEN

Short : NanoVNA P0/S1 - cable - female / female - SHORT

Load : NanoVNA P0/S1 - cable - female / female - 50 OHM

Through : NanoVNA P0/S1 - cable - female / female - cable - NanoVNA P1/S2

Isolation : NanoVNA P1/S2 - cable - female / female - 50 OHM

--
73 to you and yours.

Lex PH2LB

David Bradley 2022/01/06 15:58

Case of RTFM me thinks 73

Tim K4SHF 2022/01/06 11:02

Or watch some of the multitude of Youtube videos....


On Thu, Jan 6, 2022 at 10:58 AM David Bradley <bozzbradley@gmail.com> wrote:

Jim Lux 2022/01/06 08:51

On 1/6/22 7:58 AM, David Bradley wrote:
> Case of RTFM me thinks 73
>
>
Perhaps, but sometimes it's nice to have the same information presented
in a different form.  This little table is actually pretty convenient.

Jim Lux 2022/01/06 08:57

On 1/6/22 8:02 AM, Tim K4SHF wrote:
> Or watch some of the multitude of Youtube videos....
>
>
As with previous comment, different modalities of presentation for
different folks are always a good thing.

Personally, I don't really like videos for technical topics - I'd rather
see clear drawings and text.  Videos are nice for something that isn't
easily explained in drawings. A nice example is changing the battery on
a late model range rover - the instructions just say stuff like "remove
bracket" without indicating how you're supposed to do that. A 30 second
video shows the key things.

But, there are lots of 30-60 minute webinars, videos, etc. and since
they usually don't have a transcript, you have to go back and forth to
find the information you want (particularly on a second trip through).

We also have a lot of 30-60 second videos at work showing how to do
something in Alfresco, DocuShare, or Sharepoint.  They're easy to make,
but difficult to "search".  If I need to change permissions on a folder,
I'd rather search a document for "permissions" than scroll through
dozens of videos.

But that's me, and my particular use-case.

Tim K4SHF 2022/01/06 12:06

You'll find the videos from W2AEW very good. Short, to the point and he
normally gives all the links he might mention and a pdf of the notes he
used. And rarely do they exceed a 10 minute length AND the presenter
answers questions you may have. He's a very responsive guy.

Tim K4SHF


On Thu, Jan 6, 2022 at 11:57 AM Jim Lux <jim@luxfamily.com> wrote:

W0LEV 2022/01/06 17:07

Jim:

QUOTE: " Personally, I don't really like videos for technical topics - I'd
rather
see clear drawings and text."

Jim, I'm with you 10-times over!! I also like a few good reference books
on my shelf of printed matter. But, the present generation is hooked on
YouTube and have an aversion to reading. I dislike much of the
pseudo-technical information presented on YouTube and other videos. That
having been written, several professional videos from names we Chrome Domes
would recognize are pretty good. One I've recently used is that from
FairRite on determining the material of an unknown ferrite. I have no
taste for YouTube as makes spreading of snake oil so easy.

I'll stick with printed matter, thank you!

Dave - WØLEV

On Thu, Jan 6, 2022 at 4:57 PM Jim Lux <jim@luxfamily.com> wrote:

> On 1/6/22 8:02 AM, Tim K4SHF wrote:
> > Or watch some of the multitude of Youtube videos....
> >
> >
> As with previous comment, different modalities of presentation for
> different folks are always a good thing.
>
> Personally, I don't really like videos for technical topics - I'd rather
> see clear drawings and text. Videos are nice for something that isn't
> easily explained in drawings. A nice example is changing the battery on
> a late model range rover - the instructions just say stuff like "remove
> bracket" without indicating how you're supposed to do that. A 30 second
> video shows the key things.
>
> But, there are lots of 30-60 minute webinars, videos, etc. and since
> they usually don't have a transcript, you have to go back and forth to
> find the information you want (particularly on a second trip through).
>
> We also have a lot of 30-60 second videos at work showing how to do
> something in Alfresco, DocuShare, or Sharepoint. They're easy to make,
> but difficult to "search". If I need to change permissions on a folder,
> I'd rather search a document for "permissions" than scroll through
> dozens of videos.
>
> But that's me, and my particular use-case.
>
>
> > On Thu, Jan 6, 2022 at 10:58 AM David Bradley <bozzbradley@gmail.com>
> > wrote:
> >
> > Case of RTFM me thinks 73
> >
> >
> >> On 6 Jan 2022, at 07:50, Lex PH2LB <lex@ph2lb.nl> wrote:
> >>
> >> 
> >>
> >> The double SMA female to female is indeed used for the THRU
> >> calibration. but also used for the other calibration when using
> >> cables.
> >>
> >>
> >> Open : NanoVNA P0/S1 - cable - female / female - OPEN
> >>
> >> Short : NanoVNA P0/S1 - cable - female / female - SHORT
> >>
> >> Load : NanoVNA P0/S1 - cable - female / female - 50 OHM
> >>
> >> Through : NanoVNA P0/S1 - cable - female / female - cable -
> >> NanoVNA P1/S2
> >>
> >> Isolation : NanoVNA P1/S2 - cable - female / female - 50 OHM
> >>
> >> --
> >> 73 to you and yours.
> >>
> >> Lex PH2LB
> >>
> >
>
>
>
>
>
>
>
>

--
*Dave - WØLEV*
*Just Let Darwin Work*

Walter Egenmaier 2022/01/06 11:35

Thank you, Jim...appreciate the help.

On Thu, Jan 6, 2022 at 10:51 AM Jim Lux <jim@luxfamily.com> wrote:

> On 1/6/22 7:58 AM, David Bradley wrote:
> > Case of RTFM me thinks 73
> >
> >
> Perhaps, but sometimes it's nice to have the same information presented
> in a different form. This little table is actually pretty convenient.
>
>
> >> On 6 Jan 2022, at 07:50, Lex PH2LB <lex@ph2lb.nl> wrote:
> >>
> >> 
> >>
> >> The double SMA female to female is indeed used for the THRU
> >> calibration. but also used for the other calibration when using cables.
> >>
> >>
> >> Open : NanoVNA P0/S1 - cable - female / female - OPEN
> >>
> >> Short : NanoVNA P0/S1 - cable - female / female - SHORT
> >>
> >> Load : NanoVNA P0/S1 - cable - female / female - 50 OHM
> >>
> >> Through : NanoVNA P0/S1 - cable - female / female - cable - NanoVNA
> P1/S2
> >>
> >> Isolation : NanoVNA P1/S2 - cable - female / female - 50 OHM
> >>
> >> --
> >> 73 to you and yours.
> >>
> >> Lex PH2LB
> >>
> >
>
>
>
>
>
>
>
>

--
Walter H. Egenmaier, O.D
EyeCare Consultants
Evansville, IN 47708
(812) 426-2020 Phone
(812) 426-2828 Fax
WB4ZUT
wegenmaier@gmail.com
http://www.eyecare-consultants.net

Walter Egenmaier 2022/01/06 11:38

Thank you , Tim...I've listened to several of his videos and he is
excellent. But when I go to find the links or PDFs he says are there, I am
unable to find them. All I find are about 150 replies and other questions,
but no links or PDFs.
Walt

On Thu, Jan 6, 2022 at 11:06 AM Tim K4SHF <timothytapio1@gmail.com> wrote:

> You'll find the videos from W2AEW very good. Short, to the point and he
> normally gives all the links he might mention and a pdf of the notes he
> used. And rarely do they exceed a 10 minute length AND the presenter
> answers questions you may have. He's a very responsive guy.
>
> Tim K4SHF
>
>
> On Thu, Jan 6, 2022 at 11:57 AM Jim Lux <jim@luxfamily.com> wrote:
>
>> On 1/6/22 8:02 AM, Tim K4SHF wrote:
>> > Or watch some of the multitude of Youtube videos....
>> >
>> >
>> As with previous comment, different modalities of presentation for
>> different folks are always a good thing.
>>
>> Personally, I don't really like videos for technical topics - I'd rather
>> see clear drawings and text. Videos are nice for something that isn't
>> easily explained in drawings. A nice example is changing the battery on
>> a late model range rover - the instructions just say stuff like "remove
>> bracket" without indicating how you're supposed to do that. A 30 second
>> video shows the key things.
>>
>> But, there are lots of 30-60 minute webinars, videos, etc. and since
>> they usually don't have a transcript, you have to go back and forth to
>> find the information you want (particularly on a second trip through).
>>
>> We also have a lot of 30-60 second videos at work showing how to do
>> something in Alfresco, DocuShare, or Sharepoint. They're easy to make,
>> but difficult to "search". If I need to change permissions on a folder,
>> I'd rather search a document for "permissions" than scroll through
>> dozens of videos.
>>
>> But that's me, and my particular use-case.
>>
>>
>> > On Thu, Jan 6, 2022 at 10:58 AM David Bradley <bozzbradley@gmail.com>
>> > wrote:
>> >
>> > Case of RTFM me thinks 73
>> >
>> >
>> >> On 6 Jan 2022, at 07:50, Lex PH2LB <lex@ph2lb.nl> wrote:
>> >>
>> >> 
>> >>
>> >> The double SMA female to female is indeed used for the THRU
>> >> calibration. but also used for the other calibration when using
>> >> cables.
>> >>
>> >>
>> >> Open : NanoVNA P0/S1 - cable - female / female - OPEN
>> >>
>> >> Short : NanoVNA P0/S1 - cable - female / female - SHORT
>> >>
>> >> Load : NanoVNA P0/S1 - cable - female / female - 50 OHM
>> >>
>> >> Through : NanoVNA P0/S1 - cable - female / female - cable -
>> >> NanoVNA P1/S2
>> >>
>> >> Isolation : NanoVNA P1/S2 - cable - female / female - 50 OHM
>> >>
>> >> --
>> >> 73 to you and yours.
>> >>
>> >> Lex PH2LB
>> >>
>> >
>>
>>
>>
>>
>>
>>
>>
>>
>
>

--
Walter H. Egenmaier, O.D
EyeCare Consultants
Evansville, IN 47708
(812) 426-2020 Phone
(812) 426-2828 Fax
WB4ZUT
wegenmaier@gmail.com
http://www.eyecare-consultants.net

John Cunliffe W7ZQ 2022/01/08 07:27

Don't look in the comments, look right in the description of the videos. Its all there.

N0UDF 2022/01/08 09:52

Understand the table as presented here on how to calibrate. What I don't
understand is where the calibration endpoint is if I am trying to attach to
PL259. I can convert from PL259 to SMA with cable SO239 to SMA male. Does
the cable cause my calibration to require an electronic delay? As you know
the S, O, Load calibration caps won't attach to SO239 at the PL259 feedline
point.

Thanks for any insight.
Michael N0UDF

On Sat, Jan 8, 2022 at 9:27 AM John Cunliffe W7ZQ <n2nep@rochester.rr.com>
wrote:

Walter Egenmaier 2022/01/08 09:53

Dumb question, John...I have looked there and nothing there. Must you be a
paying member to see it? I get occasional reminder to pay for YouTube. Is
this a pay function to get these notes?
Walt

On Sat, Jan 8, 2022 at 9:27 AM John Cunliffe W7ZQ <n2nep@rochester.rr.com>
wrote:

> Don't look in the comments, look right in the description of the videos.
> Its all there.
>
>
>

--
Walter H. Egenmaier, O.D
EyeCare Consultants
Evansville, IN 47708
(812) 426-2020 Phone
(812) 426-2828 Fax
WB4ZUT
wegenmaier@gmail.com
http://www.eyecare-consultants.net

Raj vu2zap 2022/01/09 10:44

When I use SO239/PL239 or N type then I calibrate with S, O, L and thru of that type.
N is commonly available but SO239/259 Short you will have to make it yourself. Open
thru and L are available.

Raj, vu2zap

At 08/01/2022, you wrote:

John Cunliffe W7ZQ 2022/01/08 21:54

https://www.arraysolutions.com/as-pls-uf

Jim Lux 2022/01/09 09:12

On 1/8/22 9:14 PM, Raj vu2zap wrote:
> When I use SO239/PL239 or N type then I calibrate with S, O, L and
> thru of that type.
> N is commonly available but SO239/259 Short you will have to make it
> yourself. Open
> thru and L are available.
>
> Raj, vu2zap
>
> At 08/01/2022, you wrote:
>> Understand the table as presented here on how to calibrate. What I
>> don't understand is where the calibration endpoint is if I am trying
>> to attach to PL259. I can convert from PL259 to SMA with cable SO239
>> to SMA male. Does the cable cause my calibration to require an
>> electronic delay? As you know the S, O, Load calibration caps won't
>> attach to SO239 at the PL259 feedline point.


Or, if you're working at HF, and aren't worried about absolute phase,
the 1" length of the adapter probably doesn't make a lot of difference. 
Even if you're worried about phase (i.e. you're matching feedline
lengths), the error from the adapter would be the same on all the
measurements, so relative measurements will be good.

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