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It’s
important to note that although the
UPL-2 was designed to be used with
either a Waveguide or COAX switch,
any 2 position switch with a control
voltage of 20-30 volts may be
controlled with this unit.
(The
other assumption is that the current
is below 3 amps, and a low loss
cable is being used.)
A
waveguide switch is a 4 port
device. On the front panel of the
UPL-2, the waveguide switch has the
designation of S1B.
S1A
represents the input switch.
This
switch(es) may be a ganged
waveguide/coax switch, or your
application may handle the input to
the amplifiers in a different
manner. In your application, the
S1A (input) switch may be replaced
with an input divider or power
splitter. Whether the input switch
(S1A) actually exists in your system
or not, does not matter.
If
you have 2 switches , it is also
possible to get a little creative
and control the input and output
switches together using a specially
made cable with one end interfacing
to the controller, and the other end
having 2 separate connectors. This
assumes the voltage and polarity are
the same for both switches and you
don’t exceed the current capacity of
the controller.
Switch position status should always
come from the output switch since
this is where the inhibit function
is generated. In short, whatever
position indicators are fed into the
switch interface connector at the
rear of the chassis will determine
what gets displayed on the front
panel.
Waveguide switch status is
constantly monitored and displayed
on the front panel of the control
unit. Changing a switches’
position is accomplished by setting
the control unit in MANUAL, then
depressing the switch command button
located inside the switch icon on
the front panel. After entering a
switch command, a command relay
inside the control unit closes,
activating the W.G. switch to change
position. The command relay is
activated for about 500 mSec. There
is a command relay each for position
1 and for position 2.
A led
is mounted on the control unit
circuit board next to each command
relay. The led is lit as long as a
command voltage is being sent out to
the waveguide switch. With no
switching taking place, both
(position 1 and position 2 commands)
LED’s should be off. The waveguide
switch is in position 1 when
amplifier 1 is “online” and
amplifier 2 is working into the
load.
A
switch position may be changed by
using the manual override knob (if
provided) on top of the switch
without effecting the operation of
the control unit. The inhibit
function will work no matter what
method of changing the switch is
used.
The
UPL-2 will interface to (almost) any
wave guide switch (Not Included, but
we can get one for you if needed.).
The switch to be operated should
have a specified voltage of 20-36V
(with the common being negative. If
your application is different,
contact factory.) S1B is the
waveguide switch.
CABLES
Cables can be purchased from C&M
Systems. The mating connector of
the waveguide switch must be
supplied to C&M, and the length
specified.
If
you are making your own switch
cable, remember to factor in the
resistance of the cable your using.
The gauge of the wire and the length
are the two factors that should be
used when calculating the
resistance.
The
voltage drop (or loss in the switch
cable) is dependant on how much
current your switch will draw.
Copper wire resistance table
AWG Feet/Ohm Ohms/100ft Ampacity* mm^2 Meters/Ohm Ohms/100M
10 490.2 .204 30 2.588 149.5 .669
12 308.7 .324 20 2.053 94.1 1.06
14 193.8 .516 15 1.628 59.1 1.69
16 122.3 .818 10 1.291 37.3 2.68
18 76.8 1.30 5 1.024 23.4 4.27
20 48.1 2.08 3.3 0.812 14.7 6.82
22 30.3 3.30 2.1 0.644 9.24 10.8
24 19.1 5.24 1.3 0.511 5.82 17.2
26 12.0 8.32 0.8 0.405 3.66 27.3
28 7.55 13.2 0.5 0.321 2.30 43.4
These Ohms / Distance figures are
for a round trip circuit.
Specifications are for copper wire
at 77 degrees Fahrenheit or 25
degrees Celsius.
Refer
to the
Rear Chassis Interface
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