TELE-audiovision - The World’s Largest Digital TV Trade Magazine - page 106

TELE-audiovision International — The World‘s Largest Digital TV Trade Magazine
— 1 -12/2013
6. Now for something
completely different. At 75
MHz a signal of -35 dBm is
generated and measured
with a deviation less
than 1 dBm. Absolutely
7. Since the Deviser S7000
supports two markers
in CATV mode which is
used to measure the tilt
between two channels, I
generated one signal at 80
MHz with -35 dBm and a
second signal at 100 MHz
with -45 dBm. Incredibly,
the deviation was -0.1
dBm and -0.2 dBm,
respectively. The tilt was
measured with 9.9 dB.
8. To test the end of scale
I generated a signal at 2000 MHz with -15 dBm. Again the Deviser
S7000 measured this signal with an amazing precision.
9. To test the sweep generator several slop step intervals had to be
tested in order to allow the spectrum analyzer function to sample
enough data to correctly measure the signal.
10. With a slop step interval of 500 ms the Deviser S7000 produced
good results so I started the test run.
11. First I measured the whole spectrum with the MAX function
active. This way we can see the whole range at the end of the test.
The result is excellent with the spectrum oscillating about 3 dB
around -35 dBm, which is the output level setup on the Handheld
Satcom Test Source. This oscillation is an acceptable error and
due to the fact that I was giving the spectrum analyzer just about
the time to render the spectrum.
12. This picture shows the same output signal, but this time the
signal had to pass a multi switch and about 20 meter of cable, an
aerial socket and then another cable before reaching the spectrum
analyzer. Notice that only the upper curve is of interest. The result
is clear to see: there is an over attenuation of about 10 dB to 15 dB.
Also, it is clear to see that the attenuation is not uniform.
converter (part number
08590-60090) designed for
the 1 MHz to 1.8 GHz range
was used. This converter has
an attenuation of -15 dBm.
The WORK Microwave
Handheld Satcom Test
Source shows here that this
professional signal analyzer
can perform measurements
with a deviation of less than
1 dB. This is extremely low
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