[CQ-Contest] biggest 20M array in the world ?

[jukka.klemola@nokia.com]

Hi,
Currently the largest 20m system in Finland is at
OH6KN/OH8NC contest site.
Their 20m strategy is to follow Frank, W6KPC, and Simo, OH8OS
large 20+dBi at 20m array ideology.
The site is 20 hectars, 400mx500m (440x550yds or so)
Current 20m antennas are:
6o6o6 mono, highest up 105m on a rotary tower
6pcs tribanders with 3 elements on 20 in each, highest at 60m
on another rotary tower.
There is also a yagi or two elsewhere on other tower(s).
Largely built & raised by professionals.

They have reserved space for a 6o6o6 on another 60m high tower
but currently that is not installed if I have correct information.


OH4A/OH6LI 4o4o4 rotary + 4o4o4 rotary + 2el fixedEU
This is a home made system.
Towers were raised together with OH8QD, though.


1990 at PJ9A/PJ9W we had on 20:
5o5 for EU
5+5 el, upper rotary, lower fixed USA/JA
Maybe a 5 el on another tower.
Dipole for mult station
That is how I remember the 1990 configuration on 20.
I used the 5+5 el so I had the upper antenna turned to EU
and twisted it occationally to AF to find out if someone
was calling.

In 1990 we had also a H frame 4 pcs 4 el yagis on 15.
Plus a 15m stack or two on other towers.
The 10 and 15m H frames were rotary but the 15m rotator
was broken before CW.

The funniest thing at 1990 PJ9A was when YV5ANT arrived
there for operating 40m.
He asked 'I can see the 20m looks good but why the 40m
three el yagi is so low?'
His disbelief was silent but well communicated when I
explained him the tower next to us was 40m 4 over 4
and the 80m 3el crank up was at down position but it
would go to 150+ft before the contest.


73,
Jukka OH6LI