Table of Contents
Advertisement
background noise would rise drastically due to the pre-stage jamming. The
useful-signal ratio drops as well. To solve this problem, use can increase the
reference level to activate the attenuator, and the amplifier would be disabled
automatically. Also, user can enable the attenuator and disable the amplifier
manually. The anti-interference ability of port 2, which is on the right side,
outperforms port1, which is on left side. Thus port 2 should be preferred.
If necessary, consider putting suitable filters in series between KC908 and
outdoor antenna.
4.3.2 Hand-held Antenna
For hand-held antennas that are to be used in a mobile manner, select
those with desired frequency and gain. Besides, the distance between the
antenna and KC908 as well as the force exerted on the RF port should be
taken into account.
To improve power efficiency as well as to shrink the size, multiple high
performance switches have been used in KC908. Despite measures like
dithering and shielding, there is still a small amount of high frequency
radiation. More importantly, although those high frequency radiation is much
weaker than the EMI standard, it's way stronger than KC908's sensitivity. In
other words, KC908 would be interfered by its own EMI if the antenna points
to itself.
Advertisement
Table of Contents
