----- 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
terminal
#8. Now all necessary wires for automatic control are available at the
back
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