Re: [Gpredict-discussion] Tracking Issues

[Luca B. <luc...@st...>]

Hi Eric,
sorry for the delayed answer.
No accurate testing was ever done on the rotor (an Alfaspid Ras Az/El), just checked if the motors were operative. as far as I've been told so possibly this problem was already present (this is an univeristy project).
I used a port sniffer to check the packets sent and received from the Rot2Prog controller, and no particuarly strange orders were presents, or at least I could not identify any. I don't think that the problem is the speed, since i set the port at 600 bps (as the protocol requires) and use a ~3000 ms refresh rate. If you know how to further limit the speed please let me know.
I also tested the rotor tracking with Orbitron and its driver, and I noticed that the problem is also present with it, even if with lower severity.
This may confirm that there is an hardware problem with the rotor or the controller, but that would not explain why when issuing manual commands it behaves like it should.  Tomorrow I will run more tests to confirm this, but honestly I'm at a loss here.
Thank you again for your time.
Luca

________________________________________
Da: Eric Schumacher <wb...@sb...>
Inviato: giovedì 5 maggio 2016 21.42.13
A: 'Gpredict discussion'
Oggetto: Re: [Gpredict-discussion] Tracking Issues

Hello Luca
You don't say whether or not your system has ever worked correctly so its
hard to give appropriate guidance. Having had similar problems with Gpredict
but using other rotor controllers I can only guess about your situation.
When tracking GP spits out additional data than AZ/EL coordinates and at a
rate that may be faster than your controller can digest. Put a port sniffer
on your PC/GP link and see what is passing thru. You may be surprised.
Best of Luck
Eric
WB6KCN

-----Original Message-----
From: Luca Bellavista [mailto:luc...@st...]
Sent: Thursday, May 05, 2016 1:50 AM
To: gpr...@li...
Subject: [Gpredict-discussion] Tracking Issues

Hello,

I'm using Hamlib 3.0 with Gpredict in order to control a Alfaspid Rotator
with a Rot2Prog controller and I'm experiencing some problems.

I can give orders via the controller (using its buttons), via cmd with
rotctl and within the Rotator Control of Gpredict (calling rotctld in cmd)
and as long as these commands are given manually there are no issues.
However when I track a satellite something strange happens. The rotator will
be out of position while the controller indicator give a wrong reading. For
example let's suppose that a tracking should finish in 0° Azimuth and 0°
Elevation: the controller and all the readings give (0,0) while the antenna
is still pointing up and not at North.  Every time I have to recalibrate the
direction, and I can't say with accuracy when it sart to lose it.


I am assuming that is a software error since, as i said before, the other
methods do not give errors.


I am using  Gpredict V 1.3-3, with the Hamlib 3.0 in Windows 8.1 (I know,
but the laptop is not mine).

To activate the Hamlib driver I use:


rotctld -m 901 -r COM7 -T 127.0.0.1 -t 4533 -vvvvv


For the tracking: 3000 ms cycle and 1° Tolerance


>From the verbose in the cmd all seems fine, but I'm no expert.

Thanks in advance for any help.

Luca
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