[UK-CONTEST] Filters

[G3SJJ]

There are some very narrow filters available but ICE and Dunestar 
bandpass filters wouldn't make much difference as they are specifically 
designed to cover the whole band and drop off rapidly either side. I 
think antenna separation is the key.

We did some tests here last June in readiness for the IOTA contest since 
our strategy was going to be based on the Mult station working opposite 
mode Run band mults, similar to your idea. With about 100m separation 
betwen the various antennas there was no problem on 10/15/20, it was 
difficult but workable on 80 and virtually impossible on 40m (although 
the 9As seem to manage it in IOTA contest, suggesting a separation of 
many 100 metres!!)

In reality, we couldn't achieve the separation at GU8D because on 
arrival on site we found much of the field cordoned off so had to 
quickly re-vamp the planned layout which then caused other problems 
regarding EMC issues. We still were able to get about 50m separation for 
the beams and found in-band working good on those bands, but not on 40 
or 80.

Bob AGC comments sounds similar and he also mentions orientation, 
although we haven't looked at radio specs.

Chris G3SJJ



Ron Fraser wrote:

>Hi guys,
>Does anyone have info or experience with regard to the following scenario?
>
>Filters: Is there a filter setup that can be used in a contest situation when radio 1 is on SSB and radio 2 is on CW both being on the same band at the same time?
>I'm just testing the waters before the event.
>
>Any help, info, suggestions etc would be appreciated
>
>Ron GM0NTL
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