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Measure SMA connector - RF Cafe Forums
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UKnowWhat
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Post subject: Measure SMA connector
Posted: Mon Mar 12, 2007 9:13 pm
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Captain |
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Joined: Tue Jun 21, 2005
3:50 pm Posts: 8 |
I need to measure VSWR and insertion loss of some
SMAs from 0.5GHz to 5GHz. Any advice of how to do
that? I have access to 8753C, SA 8566B. How do they
test SMAs at manufacturers like Amphenol or Tyco
anyway? Thanks Lanny
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UKnowWhat |
Post subject:
Posted: Tue Mar 13, 2007 4:30 pm
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Captain |
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Joined: Tue Jun 21, 2005
3:50 pm Posts: 8 |
Do you think put 2 identical SMAs back to back with
connection strip (or mechanical sleeve) less than
calibration adapter kit's electrical length will
solve the problem (take the average of the 2)?
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IlikeRf |
Post subject:
Posted: Fri Mar 16, 2007 7:45 pm
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Lieutenant |
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Joined: Sat Mar 10, 2007
11:29 pm Posts: 4 |
Hi, Can you describe what type of interface do
you have on both ends of your SMA connector?
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RFTEJerry |
Post subject:
Posted: Tue Mar 20, 2007 1:53 pm
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Captain |
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Joined: Thu Apr 13, 2006
9:53 am Posts: 17 Location: Florida
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Hello UknowWhat, Are these SMA adapters or
SMA connectors on cables? If they are adapters,
are they the same type on each end or opposite type?
This is important because if they are opposite type
then they are "insertable" and you won't need to
account for the extra adapters. The 8753C
NA is perferable becuse it can do both measurement,
apply the corrections and calculate the answer in
the units you need. It can also be done with the
8566B but you will need extra equipment like a coupler
or VSWR bridge for example. Before a method
to do the test can be given we need to know the
answers to the first questions in paragraph 1.
Regards, RFTEjerry P.S. I could not use
the correct terminology because there must be a
filter on the forum to sensor certain words so I
used "type" instead. I hope you get the meaning.
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Kirt Blattenberger
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Post subject:
Posted: Tue Mar 20, 2007 6:52 pm
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Site Admin |
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Joined: Sun Aug 03, 2003
2:02 pm Posts: 476 Location: Erie, PA
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RFTEJerry wrote:
P.S. I could not use the correct terminology
because there must be a filter on the forum
to sensor certain words so I used "type" instead.
I hope you get the meaning.
Greetings RFTEJerry: I'm glad to
see that you use the "Preview" button before posting,
since that is how you would have caught the censoring
of the word s e x. It ends up like this:
*censored* It is an unfortunate necessity
due to the amout of vulgar content posted by vulgar
people. The latest trick is posting links to have
vulgar images appear in the forum threads. It is
a constant battle keeping them cleaned up. My concern
is that someone in the workplace will view a forum
post and something will appear that could cause
trouble for the viewer. Imagine the potential for
problems if one of those pictures or a page full
of censored words was left inadvertently sitting
on a computer screen in a workplace! Fortunately,
within a few months there is supposed to be a major
new release of the forum software that has a lot
of filtering built in. It's in Beta now, but I don't
want to run Beta software on the public forum.
What a sick bunch of people there are in the
world that get their satisfaction imposing their
depravity on the rest of us. Their methods and motives
are no better than other terrorists who loom in
a cover of anonimity and prey on the innocent. I
would show the worst of them no mercy when caught.
Thanks for your work as moderator of this forum,
and note from the example at the beginning that
you can actually "fool" the censor system for the
cause of all that is good
_________________ - Kirt Blattenberger
RF Cafe Progenitor & Webmaster
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UKnowWhat |
Post subject:
Posted: Fri Mar 23, 2007 12:12 pm
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Captain |
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Joined: Tue Jun 21, 2005
3:50 pm Posts: 8 |
Hi all, Thanks for the reply. I was so busy
lately that rfcafe must be in another planet.
The SMA connectors are panel mounted jack. The
VNA test cable interface is APC-7. We do also have
precision 3.5mm supplied by Agilent so we can use
it as an SMA adapter and calibrate it out. After
some researches and reading an old textbook by Gupta,
I think it's doable by building a aluminium text
fixture with both SMA jacks mounting back to back,
connected through a 50mil diameter brass sleeve
and take the square root of the result. I could
also improve the characteristic of the connection
by insulate it with a 50Ohm seal. Theoretically.
APC-7->3.5->SMA<->SMA->3.5->APC-7
Lanny
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Posted 11/12/2012
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