Rev. 1.0
Page 39
Position the cursor to the Atten field
and select
0
dB input attenuation by
pressing the
F2
key. The right side
may now be evaluated for the reject
band. This image indicates that the
filter has a notch depth of 100 dB
because we had started with a
reference trace set for a 0 dB
indication. The SCAN width on
spectrum analyzer #2 can be adjusted
down to 100 kHz to allow more finite tuning of frequency. Toggling the
input attenuation between 0 and 30 dB while tuning allows monitoring of
both the reject notch depth and the pass band insertion loss.
Swap the Cable and load between the
160 MHz and the 165 MHz ports on
the duplexer to view the characteristics
of the other filter in the duplexer. The
image to the right indicates that this
filter also has a 100 dB notch depth.
Set the Input Attenuation back to 30 dB
now to evaluate the insertion loss of
this side of the filter.
Additional range can be obtained
by reducing the Resolution
Bandwidth and slowing the sweep
d
Summary of Contents for COM-120B
Page 1: ...Rev 1 0 Page 1...
Page 2: ...Rev 1 0 Page 2...
