SJ2W Contest Station

The main antenna system on 20m consist of a 6/6/6el monoband stack, at 55/39/23m height. This antenna system has got a phase box making it possible to change the vertical lobe angle in four different steps. Either 7, 13, 17 or 25 degrees. The three antennas are always fed together, but there is a possibility to put in a 180 degree coax on two of the antennas, making it possible to switch it in four combinations. The phasing system in theory, makes it so that we have a maximum of 3dB drop between 6 and 28 degrees compared to max gain. These antennas are homebrew after OH8QD design (18.5m booms!), but with rebuilt feed point system from gamma to hairpin.

There is also a 4el monoband yagi with CUE DEE design but also with rebuilt feed point system from gamma to hairpin. This antenna sits 16m up in a 18m high tower, and is fixed Europe.

For the 6/6/6el stack there is a 7/8″ cable running from the switch room up to the phase box which is about 37m up in the 60m tower. From the phase box there are 3 pcs of RG-213 running out to each antenna. All connectors here are 7/16″ DIN. For the 4el monoband yagi there is a 7/8″ coax from the switch room up to the antenna, and a RG-217 jumper cable attached to the hairpin match.

Phase box details
Album
Phase box progress

The future plans for this band is to add a secondary antenna system which will be a 5/5el stack sitting in a 40m rotatable tower. This will hopefully be done in 2012.

6/6/6el stack

6/6/6el stack

6/6/6el stack

Tuning one of the 6el yagis

4el mono @EU at 16m height

4el mono @EU at 16m height

6/6/6el stack
Starting with antenna work
20m beam ready
20m beam up
Some climbing
Antenna work in the snow
Some construction videos
Phase box progress
Some damage + a lot of work done
What a crap weekend
2/3 of the stack complete
6/6/6el stack complete
Phase box connected

4el yagi @EU
What a crap weekend
4el mono for 20m up