[amsat-bb] Re: LVB Tracker
Mark L. Hammond
marklhammond at gmail.com
Sat Mar 7 11:15:29 PST 2009
I have a G-5500 and can confirm that with the 0.9 firmware I see the same memory loss; it's always related to power on/off cycling. I keep it ON all the time now, but the main power does go off/on now and then, so I have to recalibrate.
I don't recall ever having seen this running ver 0.7 on the G-5500.
>Date: Fri, 6 Mar 2009 18:09:55 -0600
>From: "Alan" <ve4yz at mts.net>
>Subject: [amsat-bb] Re: LVB Tracker
>To: <amsat-bb at amsat.org>
>Message-ID: <6DF73413341840AAAFA485A2B25AC19D at athlon>
>Content-Type: text/plain; charset="us-ascii"
>The LVB Tracker is a great little box... I have 2 for 2 separate ground
>stations. Both run on the USB.
>I can force the lost of memory on one of the LVB's if I switch the G5400B
>rotator controller off and on too fast. If I leave the G5400b off for about
>10-15 seconds before turning it back on, the LVB will usually not loose its
>mind. I have 2 different G5400b control boxes and the LVB reacts the same
>on both. Eprom 0.9 but also had this problem with 0.7
>The second LVB is on a G5500 control box and does not display this problem.
>I have not switched the 2 LVB boxes to see if the problem is related to the
>G5400 and not the G5500.
>So I am now very careful when turning it OFF and ON. The OFF/ON routine is
>sometimes required when the USB/Virtual Com Port goes brain dead on my
>laptop and the VCOM port is lost. Power OFF/ON causes XP to refind the
>virtual comport. The alternative is to unplug and replug the USB cable to
>the LVB. Either way the new virtual hardware ( comport ) is found and my
>SatPC32 runs normally.
>I also tend to avoid the eprom problem by leaving the G5400b on all the
>The other issue I have with one of the LVB boxes is the poor
>ground/shielding of the control cable. The elevation meter on the G5400b
>would not go to 0 degrees when the antenna was horizontal. This is after a
>calibration 0 to 90. Howard Long was super fast to come back by email
>with a solution to this problem saying it was an indication of poor
>shielding or grounding on the cable. I replaced the cable with one with
>more braid and foil and it improved somewhat. When I run a jumper wire from
>the chassis of the G5400b to the ground trace on the LVB PCB I then get the
>needle down to 0 degrees. The LVB on the G5500 is OKAY out of the box and
>that is why I haven't flashed the eprom from 0.7 to 0.9
>73, Alan VE4YZ
>AMSAT LM 2352
Mark L. Hammond [N8MH]
More information about the AMSAT-BB