Index

Personal

Photo

2m EME

2m ground gain

WSJT-screenshots

For sale

The QTH  

Low band HF frontend
ON900BN/P

VHF map

Linrad-toolbox

ON6BG-antenna coupler

 

 

 

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 here)

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:
the 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 The desk contol part (inner view)
The remote antenna coupler (top view) The remote antenna tuner (bottom view)

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 remote coupler unit,
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 himself.
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.

 

2. ON7EH/QRP 40mWAC

Look here for a description of the QSO's, QSL's and equipment used.