Coaxial In-Line Isolator
Buxcomm LISO2K
BUXCOMM
LISO coaxial in-Line isolator
has both shield and center conductors isolated
by multiple, ferrite cores transformer. 1.5 to
150 Mhz. Made with Multi-Mix Ferrite cores for
wide bandwidth, and Ultra-low-loss (0.5dB @ 10
mHz) RG-303 with Teflontm insulation
for high power handling.
An Isolator is installed at the output of the
radio or amplifier
A Line
Isolator is exactly what it says - the LISO
Isolates the Coax or transmission line from the
Radio to perform two functions:
-
Prevent any stray RF that may have ingressed
into the coax shield from the nearby antenna
radiation
-
Reduce spurious re-radiation or secondary
radiation that may be a product of the
random length of the transmission line.
As a
result of number 2), many parasitics that cause
TV Interference are reduced. Only a BALUN is to
be used at the Antenna feedpoint. DO NOT use a
Line-Isolator at the antenna feed-point.
When
vertical antennas are installed above radial
system, the feed-point impedance is
approximately 44 ohms. When they are install
without radials there are losses that enter into
our equation that defeat the gain/band-width
factor of our vertical antenna(s).
In
addition, the feed-point impedance is no longer
(approximately) 44 ohms. Some reduced VSWR may
be noticed, however, the gain of the antenna
suffers as a result of the antenna efficiency
loss. There is a reason for this effeciency
loss - too often there is (RF) current
introduced on to the feedline.
To
circumvent this problem with RF being induced
into the shield of the coaxial feedline, we
isolate the coaxial feedline from the RF
currents from the antenna radiation, by
inserting a "Line ISOlator" at the base or
feed-point of the vertical antenna.
The
BUXCOMM LISO (line isolator) inhibits undesired
RFI by preventing feedline currents and
re-radiation. In turn, the LISO forces all
the RF energy from the transceiver, tuner, or
amplifier, into the antenna where it adds to the
gain/band-width factor (efficiency) of the
vertical antenna.
The
BUXCOMM LISO also reduces noise and other
broadband signals picked up by the coaxial
feedline.
IN
short, the BUXCOMM LISO2K minimize radiation
from the coax shield. It further reduces TVI
and RFI. RF in the shack. For optium
performance, insert the LISO in line with any
coax fed antenna.
DO NOT
install it at the antenna feed point.
Install
the LISO at the output of the Linear, or at the
input of the coax feed-line. The BUXCOMM Line
Isolator's primary design is to choke-off RF
currents that can flow along the shield of
the coaxial feed-line. This can happen if you
are using an unbalanced antenna system.
The BUXCOMM LISO2K does not require any further tuning.
The LISO2K works great with Windoms, Dipoles,
Bazookas, Sky-wires, and Loops.
The BUXCOMM LISO2K is very
broad-banded, and is useable from 1.5 to 70 mHz
without noticable degradation, and it has
high-power handling qualities too. HF
insertion losses are negligible.