Tonno, I would suggest getting a DX-Engineering NCC-1 or NCC-2 to do the
phasing for you in your ham shack. That way you will have phasing control
right at your fingertips.
Herb Schoenbohm, KV4FZ
On Tue, Sep 11, 2018 at 9:01 AM Tonno Vahk <tonno.vahk@gmail.com> wrote:
> Hi,
>
> Last weekend I finally got into experimenting with phased beverages,
> something I was planning for some time.
>
> I installed 3 broadside 219m (718ft) long beverages into the forest
> looking at 90 degrees and separated 60m (200ft) from each other (120m
> between the outer ones).
>
> I took great care to make sure the wires are straight and fully parallel
> to each other as well as starting from the the same line.
>
> I use DXE 9:1 beverage transformers and DXE 470 ohm termination resistors.
>
> I brought 150m (500ft) 50 ohm cable from each beverage feedpoint to the
> shack and connected to Microham Stack Switch (like Stackmatch). All the
> cables were of identical length to ensure same phasing.
>
> So I presume this system gives me full ability to test any combination of
> those 3 beverages alone or phased with each other?
>
> Well, all the 3 beverages alone are quite identical indeed which is good.
>
> But now when switched in pairs or all 3 together I am not seeing much
> effect. I do know what the patterns should look like and I presumed the
> effect would be strong especially with signals coming from side but most of
> the time I notice no difference with any signals when comparing any single
> beverages to combinations.
>
> This is puzzling. Modelling suggests I should for example have very big
> improvements in suppressing signals 45 degrees off on 160m when using 2
> phased beverages 120m apart as well as when using all 3 beverages on 80m
> but I did not notice such drops of 10-20db almost in any signals from any
> off directions.
>
> I could hardly notice sometimes the expected 3-5db increase in the signals
> from the right direction but not always as well.
>
> Can some of you having experiences with phased beverages tell me if I have
> done something wrong in my setup?? Should I test them differently? Are the
> phased beverages overrated and in real life there is seldom a significant
> improvement over 1 single wire beverage that is already long enough like
> 220m in my case?
>
> Look forward to any input. I can send the modelled patterns and maps of my
> beverages in picture files to anyone interested.
>
> 73
> Tonno
> ES5TV
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