[Antennas] synchronzied MLA/trasnceiver tunig

[Brian Cake]

Henry,

    You are right, for small MLAs the narrow bandwidth is a big problem at 
the lowest frequency. I measured the MFJ loop 2:1 SWR bandwidth as 9kHz in 
the 20 meter band. My design greatly improves both the efficiency and the 
bandwidth. For example a square loop with 2.0 meter sides has a 2:1 
bandwidth in the 20m band of  50KHz. This loop operates over the 10MHz to 
30MHz frequency range.

    73

    Brian KF2YN


----- Original Message ----- 
From: "Henry Frederick "Meils" Meiseles" <meils at get2net.dk>
To: <antennas at mailman.qth.net>
Sent: Tuesday, May 24, 2011 12:16 PM
Subject: [Antennas] synchronzied MLA/trasnceiver tunig


> One of the major setbacks with MLA's is the need to retune even for small 
> (5-15kHz)
> QSY's.  Wouldn't it be possible to build a  device that would couple the 
> remotely tuned  MLA
> driving motor to transceiver tuning, perhaps where a single synchronizing 
> "zero-set" would be needed when starting up the transceiver and/or 
> changing bands? I'm thinking of the digital remote tuning options on many 
> modern rigs.
>
> I'm not necessarily talking about conventional automatic (remote) ATU's 
> but the control and sensing circuitry of such could also be applied to 
> MAL's -- presumably running QRP
> in tune-up & then automatically going to full power when the SWR is 
> minimum.
>
> For all I know, some commercial MLA models may already offer this type of 
> feature.
>
> (I take for granted that posting this idea on an open internet 
> thread/reflector is considered
> making the idea public knowledge in terms of patent claims and thus is
> not patentable --- if not have fun because I have no patent ambitions on 
> this
> nor do wish to write an article about it  -- I'm not too competent in 
> digital control
> systems. Also, I am chronically lazy ;0)
>
> 74
>
> Henry F. M., Cph.
> OZ3O NAN
>
>
>
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