[amsat-bb] FW: Re: G-5500 and LVB tracker question.

[Pierre van Deventer]

I found that the regulator output voltage inside the G-5500 drifted
slightly. 

The problem was resolved by changing the value of C9, 0.01 MFD, at output of
the regulator to a 0.1 MFD capacitor.

Before the mod the azimuth values varied by 15 degrees from switch on to
final operating temperature, after the mod the Azimuth and Elevation values
are steady.

Hope that helps.

73, Pierre ZS6BB


-----Original Message-----
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of Allan Saul
Sent: 03 July 2009 11:13
To: 'racer5039'; amsat-bb at amsat.org
Subject: [amsat-bb] Re: G-5500 and LVB tracker question.

Hi Howard and Marv,

I had exactly the same problem. The issue revolved around the
7806 regulator the is used in the G-5500 control box that
supplied the 6V DC to the position feedback potentiometers
on the rotators. If you monitor the output voltage of the regulator,
you will find they drift down considerably as the box warms up. 
Maybe they had a bad batch. 
I replaced the 7806 with a LM317T set for 6V and that solved
the problem.

73's
Allan Saul ZS1LS

-----Original Message-----
From: Howard Long [mailto:howard at howardlong.com] 
Sent: 30 June 2009 10:09 AM
To: 'racer5039'; amsat-bb at amsat.org
Subject: [amsat-bb] Re: G-5500 and LVB tracker question.

Hi Marv.

If you have the LCD fitted, do both the left and right Az/El readings move
too?

I am assuming you don't have the problem if the LVB Tracker is unplugged.

73, Howard G6LVB

-----Original Message-----
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of racer5039
Sent: 30 June 2009 00:13
To: amsat-bb at amsat.org
Subject: [amsat-bb] G-5500 and LVB tracker question.

I have the G-5500 and a LVB Tracker on my antenna set. I have noticed that
when the pair are just setting there the LVB tracker will loose its place.
By that I mean if the G-5500 box is at 180* the LVB will start out at 180
but as it sets there it will soon be at 178, 174, 172 and so on. I also
noted the meter on the g-5500 is going down too.
Where do I start looking ?

Marv
N0FJP
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