Re: [amsat-bb] Dead G-5400B

[Ronald Long <rlong3@xxxxxxxxxxxxxxx>]

At 10:06 AM 1/23/2000 -0800, kb5mu wrote:

>Unfortunately, many rotor controller designs share these defects. Either 
>nobody sees this as a problem, or nobody wants to spend the additional few 
>cents it would cost to add a hardware timeout to protect the motors.

Some time ago I looked at the schematics of the various Kenpro and Yaesu 
satellite rotators and made up the table below. Maybe it will help someone, 
like a flea market shopper.

My next installation will use the G5600B which has limit switches on both 
rotators. I bought it some years ago. I don't think it is available which 
is a shame.

I might add that the unitrac controller (www.qsl.net/zl2amd/) does have 
some protection built into the controller hardware. I am not sure whether 
it entirely protects when the computer crashes. Maybe Dave will respond to 
the bb.
======================================
Limit Switches and/or Thermal Cutouts:

KR-5400   No limit switches or thermal cutouts on Az or El
KR-5400A  Thermal on both Az and El
KR-5600A  Limit on AZ, Thermal on El
KR-5400B  Thermal on Az, Limit on El
KR-5600B  Limit on both Az and El
G-5400B   Thermal on Az, limit on El
G-5600B   Limit on both Az and El
KR-400    No limit switches or thermal cutout shown.
           But the manual states "mechanical end of rotation stops".
KR-500    No limit switches or thermal cutout shown.
           No statement in manual either.
G-500A    No limit switches or thermal cutout shown

KR-400RC  No limit switches or thermal cutout shown

======================================================



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