[ARC5] Rollerductor setting

[Jack Antonio]

On 4/20/2017 10:11 AM, J Mcvey via ARC5 wrote:

> That being said, your antenna may be be quite  a bit different due to
> construction , height above ground, proximity to other objects, etc.
> The best thing to do is to have someone with a an antenna analyzer map

I heartily agree that local characteristics will play a big
part in what works best in any given situation.

When I lived out West, high desert (Reno, NV), I would
got a bit more power out of these transmitters with both a series
cap and 4:1 unun. Antenna coupling control would be in the middle
of the range. Output would be around 35 Watts. Without the unun,
the coupling control would be at maximum, and only 30 Watts. It
seemed to me that the Antenna coupling wanted to be up around
12 or so, but of course it maxes out at 10.

I move to Central Georgia, much different environment, and now
it is reversed. I get more power out by just using a series cap,
and no unun, I get around 35 watts out with just the cap, but
only 30 or so with the unun. Using the unun does make the
antenna current indicator more lively.

This effect was noticed with multiple transmitters, but the same
antenna (Alpha Delta DX-CC).

I spent some time trying to figure out why, but short of taking a bunch 
of stuff back to Reno, and setting up the station I had before (which 
probably isn't going to happen), I just accepted it and moved on.

The point is, try different configurations, and use what works best
in your location.

Jack Antonio
WA7DIA