[Antennas] Fluid Motion Antennas

Ron W7MRR [email protected]
Tue, 2 Jul 2002 21:16:31 -0400 (EDT) 

 Dear Igor:

   As I understand it, the control box as delivered is preprogrammed for the CW and phone section of each ham band based on the fixed relationship existing between a given frequency and the physical length of the elements required to resonant at a given frequency.  I believe their software option applies the same algorithm to automate this function by reading the transceiver VFO output frequency, calculating the required physical size of the beam element(s) at that frequency and by sending a command to the beam actuator(s).  

   I would assume you would then manually adjust the antenna to the extent it exhibited an SWR that could be lowered by fine tuning.  This software and wiring interface is being offered as an option for many modern day transceivers with, as I understand it, more will follow as new transcievers are produced.

Ron




 --- On Tue 07/02, Igor Sokolov  wrote:
From: Igor Sokolov [mailto: [email protected]]
To: [email protected],[email protected]
Date: Tue 07/02
Subject: Re: [Antennas] Fluid Motion Antennas

> >    You are correct about having preselects on each band, however, you
> can
> remotely (1) "tune" the antenna for any frequency between 20 and
> 6 meters
> for best SWR and (2) you can also have a direct interface between your
> rig
> and the antenna so that it will tune whatever frequecy you have on your
> transceiver.  Again, fine tuning may be done from the shack for
> minimizing
> SWR.
> >
> > Ron W7MRR
> 
> Hi Ron,
> What sort of interface is that. Does it read the freq from the radio (How
> is
> that done?) and the antenna controller has got unlimited number of
> memories
> so that for every Khz  settings for all the elements are stored there? I
> understand it is possible to adjust the elements from the shack manually.
> But the way optimum F/B maintained automatically while tuning across the
> entire 20m band is not so clear.
> 
> Igor UA9CDC
> 
> 

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