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Re: Computer Controll for old Yaesu Rotators

----- Original Message -----
From: "K & R Yoksh" <yokshs@sbcglobal.net>
To: <amsat-bb@amsat.org>
Sent: Sunday, May 04, 2008 3:11 PM
Subject: [amsat-bb] Re: Computer Controll for old Yaesu Rotators

> Hello,
> I use Kansas City Tracker to operate my CDE Ham II azimuth rotor and
> Yaesu/Kenpro G500a elevation rotor. Modifying the G500a control box was
> a breeze! The rear panel has an eight wire terminal strip, although only
> wires 1-6 are actually used. I ran the common motor control wire to
> #8. Now all necessary wires for automatic control are available at the
> panel.

> 73,
> Kyle Yoksh
> K0KN
> Olathe, Kansas

Hi Kyle, K0KN

For the G-500a I understand that you connected the common motor
control wire to the available terminal #8 of the strip and using 2 external
relays you get in parallel the normally open relay contacts with strip #4
and strip #5 connected to the motor and to the front panel switches.

Now the manual switches are mechanically interlocked and the relay
contacts can be also made interlocked but the manual switching operation
is not interlocked with the automatic operation.

In this case during the automatic tracking it is possible to accidentally
press the wrong manual switch and make a short.

For the above reason I have installed my 2 relays inside the control box
and I have used the manual switches and the automatic control to excite
only the relay coils via two PNP transistor with the same circuit used
into the G-5500 control box.

Since the 24 volt AC contacts are electrically interlocked a short circuit
is now impossible.

I did the same modification as well for the CDE Tailtwister T2X

In a separate mail I have sent to you the schematic diagram of the above
modification for both the KR-500 and KR-400

Best 73" de

i8CVS Domenico

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