Re: [IRCA] Victor Misek's Phasing Unit

["Steve Ratzlaff" <steveratz@xxxxxxxx>]

Hi Bob,
(And anyone else of a technical bent),
Victor Misek originally designed the phasing unit I built for Walt, which 
has been in his self-published book in each edition. (See his webpage, use 
google, if you want to purchase his book--highly recommended if you're 
interested in Beverage antennas.) Dallas Lankford took that and modified it 
slightly, and did a writeup on it. That article is now freely available, 
along with a bunch of his other articles, on
http://www.kongsfjord.no/ Click on "The Dallas Files" and download "MW 
Phaser #2". That's the one I built for Walt. It uses 200 ohm Coarse and 50 
ohm Fine pots in series. It should not need any type of added vernier 
control. It's very easy to use.
Steve

----- Original Message ----- 
From: "Bob Foxworth" <rfoxwor1@xxxxxxxxxxxxxxx>
To: "Mailing list for the International Radio Club of America" 
<irca@xxxxxxxxxxxxxxxx>
Sent: Sunday, October 29, 2006 11:33 AM
Subject: Re: [IRCA] More phaser musings


>> >What kind of fine tuning controls do you have?  The Quantum Phaser I
>> >have does not come with them.
>> >
>> >I tried it both ways, with and without the vernier drives.  I was
>> >able to get deeper nulls with them. Sometimes just a hair made the
>> >difference of 5 to 10 db.  That is critical in many situations.
>> >
>> >
>> >Bill Harms
>
>
>> Mine is a classic Misek design with 4 potentiometers....2 for course
> tuning, and 2 for fine tuning.  They seem to work
> great..............Walt.
>> PS:  Normally they work fine with my "surgeon's touch", but when
> nulling locals, your experience parallels my own.
>
>
> Is this coarse/fine done by putting two pots in series, a high value
> (maybe 5k?) and a low value (250 ohms)?  An alternative would be
> to use a 10-turn pot with a mechanical counter dial, these can get
> costly. The two pots would create an "electrical vernier" and the
> 10-turn pot a "mechanical vernier". I would think the "electrical
> vernier" option could give better resolution, as some of the 10-turn
> pots I remember were wirewound with a slider, OK for DC work but
> maybe not so good for RF due to the inductance of the winding, and
> the jumps in resolution. A wiper on a carbon strip inside a pot has
> better continuous resolution.
>
> What was the Misek design?
>
> - Bob                      1433 est
>
>
>
>
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