Please stifle, if not block these ridiculous replies to a thread I thought
was ended.
The last comment by a certain member (Roger) was over the top.
I am not answering their messaging anymore, but while pass all and any to
someone for their redressing as the last one was over the top in false
accusations.
If one cannot ask a simple technical question like "What is a Perfect
Signal", get attacked in response and then when rebutting back with factual
background evidence as to my credentials I can back up in hard copy and with
witnesses on three continents, then this group has a problem beyond a
technical one.
I will not reply I promise to any more insults.
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My service to this country, and 3 others is well known and a matter of
record, as is my military and professional career and high-end salaries
since 2006 when I returned from supporting the Saudi Air Defense Forces for
8.5 years.
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These cheap test sets are just that. One way to end the myriad of questions
about calibration is to ask what are the units specifications that are
measurable if one takes the time to discover what precision, accuracy and
error they have in their inherent designs and within the ranges of operation
they were designed for.
Too many amateurs spent monies only to brick these delightful handsets
needlessly.
What is needed here is an evaluation as anyone would do before using a
professional piece of equipment on the bench, know its capabilities within
its intended specifications and with the three aforementioned measurable
metrics.
Matching lines - depending on the use (hopefully not commercial!), on the
low frequency end, one does not need to calibrate these units .. Just verify
against a dummy load if one suspects the unit is faulty.
At UHF and above, ranges where most amateurs do not operate, then it becomes
critical to know the unit's calibration baseline with known calibrated
transmission lines and loads - something most cannot build, or have.
In that case, it's best guess work at anything beyond coupling directly to
the antenna under design.
When I was the Joint Service SIGINT Lead System Engineer at WPAFB, we spent
more time on the hardlines and phasing lines than on the hybrid spiral horns
of that time.
Hence the use of the TDR is a great way to get around some problems and
measurements that most amateurs here really do not need to make or attempt.
But the advice on the calibration for direct antenna coupling offered here
in the past was good to excellent (if you get an Agilent or HP engineer in
the group, listen to them as that is their major bread-and-butter product to
us still working with the various world militaries and our own.)
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Again, my apologies for asking a simple question about what was a trademark
name for a product unknown to me.
And I do not want to debate the unarmed or detract from this group's
original intent and purpose.
Take care and good luck as a Moderator (doing this for International
Conferences taught me to get the guests well saturated before the working
groups collated into some violent verbal battles that do happen as its human
nature.)
W4JDY
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