Two of the lines in the cable to the rotor connect to a pot in the rotor
that changes resistance as the rotor turns.  This can be used to control
the pitch of an audio oscilator.  The circuit for the oscillator was in QST
over 20 years ago.  I don't believe I have the information any longer, but
it should be available if you search for it.  Essentially the way it works
is to rotate a rotary switch till the pointer is in the desired
direction.  The rotary switch selects among various fixed resistors.  The
pitch of an audio oscilator changes as you rotate the switch.  A push
button switches between the pot in the rotor and the resistors on the
rotary switch.  You just rotate the antenna until the pitches match.  I
wish I could be of more help.

73,

Dave, A F 6 Y

At 11:04 PM 6/9/03 -0400, you wrote:

>I'd like to get a beam back up for HF.  My Ham IV has been packed away for 7
>years since coming from the old QTH.  At that time I could still look at the
>meter and see where it was pointed.   Can this thing be made accesible?
>Perhaps via computer control?
>
>73 Steve KW3A
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