[amsat-bb] Re: satellite durability fm vs. linears

Andrew Koenig ke5gdb at gmail.com
Tue Nov 29 15:36:53 PST 2011

The thing I've been wondering (and this is in no way accusatory, just a
question out of curiosity) is why we didn't build the IHU's with NVRAM and
a circuit to cut the batteries completely out of the loop. Since the cell
failure seems inevitable, it would only make sense to design the satellites
in a way that they can work without the batteries when the batteries do

In my humble opinion, I think DO-64 was genius. It happened to fail for
another reason, but it was an interesting concept. Their telemetry program
was pretty neat too.

On Tue, Nov 29, 2011 at 3:10 PM, i8cvs <domenico.i8cvs at tin.it> wrote:

> ----- Original Message -----
> From: "zach hillerson" <qstick333 at yahoo.com>
> To: <amsat-bb at amsat.org>
> Sent: Tuesday, November 29, 2011 4:48 PM
> Subject: [amsat-bb] satellite durability fm vs. linears
> Serious question regarding satellite durability. It seems with HO68, SO67,
> and now AO51, the FM satellites are quickly going away. It also seems that
> the older linear counterparts such as AO7, VO52 and FO29 all seem to
> continue working properly.
> Zach
> Hi Zach, N4EZR
> You are right,the FM satellites are going away but the older linears
> continue to work very well and particularly VO52 but there are no
> many users on VO52 at most three or four stations when the bird
> is over North of Europe and nobody when the bird is over North
> Africa.
> Yesterday on the ascending orbit Nr 35527 I was in contact with
> IW6OVD chatting in SSB for 12 minutes only with him the full
> orbit like on the telephone.
> IW6OVD posted a mp3 file of the above QSO at the following
> address:
> http://hamradio.selfip.com/iw6ovd/VO-52.mp3
> If you haven't worked either of these three historic satellites,AO7
> VO52 (and FO29 when is active) do it NOW!
> 73" de
> i8CVS Domenico
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Andrew Koenig

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