1. The ON6BG antenna coupler
This remote controlled antenna
coupler © ON6BG (Gerard Germonpre) is a smart
piece of electromechanics that I'm proud of to have in the ham shack.
It initially served, as a matching unit, at the feedpoint (groundlevel) of an inverted monopole, at
my parent's home.
It allowed me to easily tune, two parallel wires hung up, close (at 0.7m) to the 18m lattice tower.
(the tower is nearly dismantled prior to withdrawal, see
With this setup, I've made a good number of DX-QSO's on 40m
and 80m, without a decent ground plane.
Due to a too small garden, just a limited number and short radials could be laid out.
It was based on best effort but subject to a lot of improvement...
The antenna coupler consists of two parts:
desk control part and
the remote antenna coupler part in a weathertight ex-army housing for installation near the antenna feed point.
Both units are interconnected by a 12 wire control cable, coax cable and 2-wire
dc cable (+13.8V).
The desk control part contains
four milliAmpère meters.
The two on the left side indicate the
forward and reflected power measurements at the input of the
the two other
ones give a visual indication of the
position of the 2 dc-motor-driven, roller coasters..
The four red push buttons are the CW and CCW
rotation buttons for setting the two roller coaster positions.
The switch left of the green LED on the bottom row is the ON/OFF switch. The other switch, serves as a remote toggle switch.
The 2 rows of 4 mini LED's, green and
red, indicate which of the eight capacitors has been selected
The selection is made by means of the darkgreen army swich at the left of the control box.
The inner view gives an impression of the
internal wiring and the different, the coloured back-lit LED's for the mA-meters as
well as the 4
calibration potentiometers for the forward and reflected powers in order
to accomodate the 100W power output of the transceiver.
A more detailed description of the
ON6BG antenna coupler
with comparison to an antenna tuner was recently added.
The presentation is quite unique
since it is based upon spectrum analyzer plots, taken by the ON6BG, Gerard
Those were put in such a way to facilitate easy comparison...
The schematic diagram can
be found, here.
A brief decription of the basic
functioning is also available.
here for a description of the
QSO's, QSL's and equipment used.