Last year, I was given the assignment to write an article about passive
intermodulation (PIM). That was when I first spoke to the team at
Anritsu about their PIM test analyzer, and just recently they gave me an
update. The big news is that now the analyzer is truly portable,
because they significantly shrunk the size (it is one quarter of what it
used to be) and it is battery operated (lasting more than 2.5hours).
This makes testing for PIM in remote radio head and indoor distributed
antenna systems finally possible. Rooftop sites can benefit from it too
you might ask, what are the specs on this new PIM Master MW82119A. The
device tests at 40W and, of course, includes the company’s “distance to
PIM” feature, which provides insight to where the PIM problem is, even
if it is outside the antenna system. Power can be adjusted down to 0.3W
look for PIM on lower-power systems. There are six new models, covering
the upper and lower 700 MHz bands, 850 MHz, 900 MHz, 1800 MHz, 1900 MHz,
and 1900/2100 MHz.
The PIM Master also includes standardized
testing set ups, and you can stamp your test with GPS information (this
functionality is an option). The unit has an A/C and an automotive
adapter, both recharge the battery. Another neat feature is that (with
an optional USB power meter), it can be operated in power meter mode.
unit has several operating modes, including PIM vs time measurement
(new mode), swept PIM measurement (mostly for factory testing), and the
aforementioned distance to PIM measurement. It also has report
management capabilities, allowing you to overlay PIM plots (comparing
different lines), store the results, and create one unified test report
that includes PIM, VSWR, distance to fault, and distance to PIM.
you likely know, Anritsu has many handheld units, so these PIM Master
ones are designed withstand the same rugged conditions as the company’s
other portable products. The team tells me that each unit is subjected
to a 50hour burn in, 2 hour thermal cycles.
Join our online Radio Show on Friday 11th July starting at 2:00pm Eastern, when EETimes editor of all things fun and interesting, Max Maxfield, and embedded systems expert, Jack Ganssle, will debate as to just what is, and is not, and embedded system.