In message
<64D32EE8B9CBDD44963ACB076A5F6ABB026D936A@Mailbox-Tech.lecotech.local>,
dated Wed, 15 Apr 2015, "Kunde, Brian" <brian_ku...@lecotc.com> writes:
You may just want to characterize the line filter yourself. Then you
will know. You will need a receiver or spectrum analyzer with a
tracking generator, a network analyzer, or a sig gen and power meter
combination. Our lab uses a simple labview program for characterizing
amps, filters, cables, attenuators, LiSNs, etc.. Every lab should have
something setup to do this fairly quick and easy.
Such systems do not normally model well the actual source and load
impedances seen by the filter when in service. Some filters are less
sensitive to these impedance effects than others, but above the
specified bandwidth, that may not be so.
Ideally, one would measure in situ in the product, feeding a current
(through a high impedance) in and measuring the voltage (with a
high-impedance device) out. But it may not be easy to do that now. In
the old days, we would get high impedance RF probes with most RF
instruments, but, while much easier to make now, they seem to be
anomalously rare. 50 ohms rules - not OK.
--
OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk
When I turn my back on the sun, it's to look for a rainbow
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
-
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