[amsat-bb] Re: AO-40 Replacement

Paul Stoetzer n8hm at arrl.net
Thu Sep 5 13:53:26 PDT 2013

Get on AO-7! It's certainly no harder than FO-29 or VO-52. You just have to
know if it's in Mode A or B (see here http://oscar.dcarr.org/). For next
next few months, it will alternate between Mode A and B switching some time
around 0300Z every day. When it reaches a point where it's eclipsed on
every orbit (while in the southern portion of it's orbit during part of the
southern hemisphere winter and while in the northern portion of it's orbit
during part of the northern hemisphere winter), it will always be in Mode B
(or off if it's eclipsed). It can also act a little strange at times -
FMing of the transponder, etc. AO-7 is fun because it has the widest
footprint with decent opportunities to work into South America, Europe, and
even Africa (I've heard EA8 and CT3).

As stated earlier in this thread, if all goes well, we'll have three more
Mode B linear transponders in orbit by the end of the year (FUNCube-1,
UKube-1, and Delfi-N3xt), though I believe they are all slated to be in
orbits at an altitude similar to VO-52.


Paul, N8HM

On Thu, Sep 5, 2013 at 4:28 PM, Rob <pabutusa at gmail.com> wrote:

> I miss linear transponders .... I grew up with the early RS birds
> particularly RS-6 and RS-8 .... I was only a "kid" in college ...
> If you're looking for EASY ENTRY .... MODE A ROCKS!
> That said .. I never bother with the FM birds .... tried once and it's was
> just a barrage of callsigns and grids ....
> I've been sticking with FO-29 and VO52 ... I need to give AO7 a try
> Also ..... if anyone is looking for a great transponder module for a cube
> sat ... look no further than the work of PE1RAH .... his transponder fits
> in a "cube" and is already flight proven ....
> High elliptical orbit satellites are cool .... harder to work ..... more
> transmit power ... receive preamps ... probably not entry level stuff ...
> I'd a rather see a couple LEO linear transponders rather than ONE HEO ...
> --> Rob, KA2PBT
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