Front view of an original Collins 180S-1 antenna-matching unit.
Cover removed, looking down into the unit
Another view
From the rear
The unit that was rebuilt was in poor shape. Parts that were available to
the author were used to restore it and a Bruene bridge with metering was
added as well.
As updated, seen from the front
Cover removed, looking into the unit from the rear
As above, from the top
Closeup of the Bruene bridge area
Looking down on that area
Perspective
Looking down, from rear
Three banana jacks are used. The left-hand banana jack is connected to the
input side of the L-network series inductor while the right-hand jack is
connected to the output side of that inductor. The bottom jack connects to
the high side of the shunt variable capacitor to ground. Here we see no
connections made; the series inductor is connected between the input and
the output while the variable capacitor is not connected.
Here we see the series inductor is shorted out and no connection is made
to the shunt capacitor; the L-network is entirely disabled.
The variable capacitor is connected to the input side of the series
variable inductor.
The variable capacitor is connected to the output side of the series
inductor.
Here we see the input coaxial connector, the meter calibration pot and the
"Forward / Reflected" switch.
These two connectors are intended to go to a longwire antenna. The top
connector is to the output of the L-network and the bottom connector is to
ground.
Closeup of the meter with a custom scale
made by the Tonne
Software program "Meter".
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