On Mar 20, 2023, at 4:06 PM, K9RX - Gary <amateurK9RX@...> wrote:

?I'm embarrassed to say this but I just discovered a bug when using ServoCAT-Sky to download parameters to an upgraded version 7 Gen2 ServoCAT. This ONLY applies to Gen2 and only applies if an upgrade to version 7+ has been done (which would require a download of the parameters).

I thought in the past that there was a bug where when you enter the required change in the ServoCAT-Sky motor "ENCODER" value - changing it to 1000 (this is due to a hardware difference between Gen2 and 3)... that documentation suggested to enter that value - then the ratio to be downloaded - and then repeat entering the 1000.? I had seen where in entering the ratio alone it corrupted the value.?

But today I discovered that the actual ratio value is converted to the nearest lower 1000 value! So for example I was entering a value of 3254.... but when I later went back and checked it, it was actually 3000 that was downloaded! I subsequently did an upgrade on another Gen2 and found the same thing - value entered 7254, value in the ServoCAT was 7000. So if this happened to anyone else:? this can mean a pretty severe inaccuracy in tracking. GOTO might not be impacted as the algorithm tries to resolve any differences... but tracking for sure.?

So - first apologies for not seeing this before. If anyone had me to the upgrade you are welcome to schedule to send it back for me to confirm the correct values and to re-load them if incorrect. There's an easy way to confirm the right values using Pete Eschmans excellent SCU program to read out the parameters ---- but of course that does require the originally supplied serial cable/adapter and a good quality USB adapter.

For those that have done it on their own I'd recommend you check the values using SCU.?

Note this is not a bug in the ServoCAT, rather it is a bug in the utility to download parameters to the ServoCAT.?

Gary Myers
StellarCAT