Hello We have two Yeasu 5400 AZ EL rotators with the associated controllers and the same problem. Both are about 15 years old and generally work. There is a procedure to set it up that calls for the operator to drive the AZ and EL to the 360 and 180 to set the full scale deflections. We can do this and see the required 4.5VDC on the two appropriated pins in the back. When we drive the AZ and EL back to zero, it is typically short about 10 degrees. We have attempted this adjustment several times to find the happy medium between the few adjustments but we can never get the full span. Does anyone know if there is something inside the control box we can change(or modify our set-up procedure) to get a fuller span on the AZ EL meters? In looking at the schematic, and also on the inside, we didn’t find another hidden pot to do this. If anyone can help, they also email me directly if they wish at boprie@aol.com and also Boprie@umich.edu. Tnx and 73dB de WS8P G'day
Still sounds like you are a bit low on the output voltages for the metering. I have had one here for years (in fact rebuilding it now) and you should obtain over 5 volts output and be able to adjust it down to 5 volts for full scale azimuth and elevation. Unable to do so sometimes indicates (for me it did) bad pot(s) in the control box for calibrating the units. Check with W8GUS, Ron, has he has a nice text document with a lot of Yaesu rotator notes for various individuals.
Reid, W4UPD Amsat: #17002
boprie@aol.com wrote:
Hello We have two Yeasu 5400 AZ EL rotators with the associated controllers and the same problem. Both are about 15 years old and generally work. There is a procedure to set it up that calls for the operator to drive the AZ and EL to the 360 and 180 to set the full scale deflections. We can do this and see the required 4.5VDC on the two appropriated pins in the back. When we drive the AZ and EL back to zero, it is typically short about 10 degrees. We have attempted this adjustment several times to find the happy medium between the few adjustments but we can never get the full span. Does anyone know if there is something inside the control box we can change(or modify our set-up procedure) to get a fuller span on the AZ EL meters? In looking at the schematic, and also on the inside, we didn’t find another hidden pot to do this. If anyone can help, they also email me directly if they wish at boprie@aol.com and also Boprie@umich.edu.Tnx and 73dB de WS8P G'day_______________________________________________Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author.Not an AMSAT-NA member? Join now to support the amateur satellite program!Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
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