Re: What Moon/Sun tracking software is being used.

Conrad, PA5Y

Hello Alan, for big dish EME pointing the ERC-M and PSTRotator solution is unsuitable. The ERC-M has a 10 bit ADC so for AZ 360/1024 ideally would give you 0.35 deg. PSTRotator with the ERC-M interface allows 1 deg increments for AZ and 0.1 deg for EL. So definitely not good enough for such a large dish. However it is perfectly adequate for anything that you are going to turn with a KR400!

The VK5DJ controller is one popular solution and the other (and by far the most popular) is the OE5JFL stand alone tracker combined with MAB25 or equivalent encoders.  It order to reduce backlash to acceptable levels most new systems are using solar slewing rings. Mine are on a slow boat from China and they have 0.1 deg backlash. They are for a 5m dish which is in a slow factory in China.

I opted for the OE5JFL controller and HH12 encoders which are 12bit absolute encoders, resolution is more than adequate.

I hope to get it all finished some time this year....


Conrad PA5Y

From: <> on behalf of Alan Beard via <beardal@...>
Sent: 14 May 2020 03:28
To: <>
Subject: Re: [UKMicrowaves] What Moon/Sun tracking software is being used.
Hi guys,

I'd ask of the software: What accuracy does it support?

23cm, 5m dish, required pointing accuracy: 0.5 deg.

The John Drew VK5DJ controller  as designed for VK3UM, as I recall, 
does 0.01 deg. in his software.

One's biggest problem is the position accuracy in the rotator.
My KR-400 could be up to 20 deg. out. Readily available absolute shaft encodes
do 1024 steps per rotation. 1024 / 360 => 0.3 deg. resolution. 

BTW: I've asked the "hamlib" developers to consider this and they have improved
the available accuracy in the "hamlib" library.

80                    (A problem solver, have AC, need DC)


On Wed, 13 May 2020 12:25:03 -0700, Nick Gregory G0HIK via wrote
> Thanks guys,
> I'll look at both of those and MoonSked and will report back how I get on, pretty sure I tried WXTrack in the past at some time.
> Nick G0HIK

Alan Beard

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