[OZ-CONTEST] VS: [CQ-Contest] W3NQN Pass Band Filters

[Peter Vestergaard]

Hej contestere
Hvis I synes at LZ9W altid er meget horbar, kan det godt skyldes folgende
udstyr.
Deres interne QRM- problemer ligner det her kendte. Uden filtre gar den
ikke, men det gor det ikke alene.
Den popul?re sp?ndingsregulator 723 skal total afsk?rmes og afkobles for HF,
hvis man vil undga m?rkv?rdige f?nomener grundet indstraling.
73 Peter OZ5WQ


Hi Fellow Contesters,

We are seeking for advice.
The LZ9W contest team has reached the moment when we must do something for
interstation interference while operatiing M/S or M/M.
We are now going to order a set of 6 W3NQN single band 200W pass band
filters.
Having in mind that all 4 operating places for mini M/M set up are located
into a single room ( 4m x 6 m) and all antennas are relatively close to each
other within a diameter of just app 100m we are wondering if these filters
will help significantly to reduce interstation interference ?
During the last CQWW 2002 (SSB & CW) we operated without any filtering and
in spite of considerable intereference we have not lost even a single front
end.

The 4 operating places for 2003 contest season are planned to be:

80m/10m - FT920 + Alpha 91b
20m - IC746 + ACOM 2000A
40m - TS940 + Alpha 91b
160m/15m - IC 756ProII + ACOM 2000A

Antennas are :  all WA3FET OWA yagies on 10,15 and 20m.

160m  - Inv. Vee ( app 50m away from all other antennas beside 10m ant)
80m - 2 el. phased Inv.Vees ( one element on separate Aluminum mast and
second element just 3m below 20m yagi on the tower supporting 20m yagi ,
both 80m and 20m antennas on the roof of a three stores small hotel)
40m - HB9CV yagi on separate tower app 40m away from other antennas
20m - 6 el. WA3FET on separate tower - 40m away from 40m ant and 10m ant and
30m away from 15m ant , one of 80m ant el just 3m below it .
15m - 6 el WA3FET on separate tower abt 45 m away from 40m and 10m ant and
app 30 m away from 20m ant.
10m - 7 el WA3FET on separate tower app 40m away from all other yagies and
25m away from 160m Inv.Vee .
We also have KT34A 10m below 10m yagi on the same tower.

If anyone is interested I may send him some pictures of these antennas, but
I hope my explanation is easy to understand.

So, those of you who operate in M/2 or M/M or M/S please comment on -  is it
worth to buy W3NQN filters to fight the interstation QRM ? Will it be
significantly reduced for these 500 USD we are going to spend ?

73's de Wally LZ2CJ(LZ8T) team member LZ9W & YM3LZ