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CX2SA > SATDIG 07.03.09 22:09l 174 Lines 5589 Bytes #999 (0) @ WW
BID : 15083-CX2SA
Read: GUEST
Subj: AMSAT-BB-digest V4 111
Path: IZ3LSV<IK2XDE<F5GOV<F4DUR<CX2SA
Sent: 090307/2003Z @:CX2SA.LAV.URY.SA #:15083 [Minas] FBB7.00e $:15083-CX2SA
From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. AO-27 (John Hackett)
2. Re: LVB Tracker (Mark L. Hammond)
3. Re: Limits of G-5500? (John B. Stephensen)
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Message: 1
Date: Sat, 7 Mar 2009 16:40:40 +0100
From: John Hackett <archie.hackett@xxxxxxx.xxx>
Subject: [amsat-bb] AO-27
To: <eu-amsat@xxxxxxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID: <BLU149-W583316739EDCE327F7273F91A20@xxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
As at 15:30Z 07-March-2009 AO-27, though fully operational, is not even listed
on Amsat-NA's satellite status page.
Is this because there are so few volunteers to help out ... ir did 'we' just
foget this old plodder?.
73 John. <la2qaa@xxxxx.xxx>
------------------------------
Message: 2
Date: Sat, 07 Mar 2009 14:15:29 -0500
From: "Mark L. Hammond" <marklhammond@xxxxx.xxx>
Subject: [amsat-bb] Re: LVB Tracker
To: amsat-bb@xxxxx.xxxx "Alan" <ve4yz@xxx.xxx>
Message-ID: <49b2c7cd.0504c00a.4173.4c21@xx.xxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Hi Alan,
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.
73,
Mark N8MH
>Date: Fri, 6 Mar 2009 18:09:55 -0600
>From: "Alan" <ve4yz@xxx.xxx>
>Subject: [amsat-bb] Re: LVB Tracker
>To: <amsat-bb@xxxxx.xxx>
>Message-ID: <6DF73413341840AAAFA485A2B25AC19D@xxxxxx>
>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.
>Eprom 0.7
>
>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
>time.
>
>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
>EN19kw
>AMSAT LM 2352
Mark L. Hammond [N8MH]
------------------------------
Message: 3
Date: Sat, 7 Mar 2009 19:53:01 -0000
From: "John B. Stephensen" <kd6ozh@xxxxxxx.xxx>
Subject: [amsat-bb] Re: Limits of G-5500?
To: <amsat-bb@xxxxx.xxx>, "Mark L. Hammond" <marklhammond@xxxxx.xxx>
Message-ID: <A84FDE08E21D4FC9B555359C2FD01641@xxxxxxxxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
The G-5500 handles 10 square feet of wind load so a 7.5 foot dish will
exceed that by a factor of 4. You'll need a rotator designed for HF
log-periodic antennas or C-band satellite dishes.
73,
John
KD6OZH
----- Original Message -----
From: "Mark L. Hammond" <marklhammond@xxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Sent: Saturday, March 07, 2009 14:25 UTC
Subject: [amsat-bb] Limits of G-5500?
> Hi All,
>
> Recently I acquired a 7.5' dish. It's aluminum with a steel ring mount.
> I estimate the dish weights maybe 50 lbs?
>
> What is a realistic limit for a Yaesu G-5500 rotator? Would it handle a
> dish of this size/weight if carefully counterbalanced? Or is it too big
> and silly to even consider?
>
> I know wind load is a concern of course, too. But I imagine keeping it
> close to the ground...
>
> I've thought about cutting it down in size to reduce weight and wind load,
> but would rather not go that route...
>
> 73,
>
> Mark L. Hammond [N8MH]
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
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------------------------------
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End of AMSAT-BB Digest, Vol 4, Issue 111
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