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CX2SA > SATDIG 27.12.13 21:07l 379 Lines 12748 Bytes #999 (0) @ WW
BID : AMSATBB8474
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Subj: AMSAT-BB-digest V8 474
Path: IZ3LSV<IQ2LB<IK1NHL<CX2SA
Sent: 131227/2004Z @:CX2SA.SAL.URY.SA #:2001 [Salto] FBB7.00e $:AMSATBB8474
From: CX2SA@CX2SA.SAL.URY.SA
To : SATDIG@WW
Today's Topics:
1. I thought it was Vaporware (Gary "Joe" Mayfield)
2. Re: I thought it was Vaporware (James Duffey)
3. Re: Help with SATPC32 (maybe groups) please (Burns Fisher)
4. Re: AO-73 Question (mode efficiency?) (Robert Bruninga)
5. Re: AO-73 Question (mode efficiency?) (Graham Shirville)
6. Re: AO-73 Question (mode efficiency?) (Stefan Wagener)
----------------------------------------------------------------------
Message: 1
Date: Fri, 27 Dec 2013 07:35:54 -0600
From: "Gary \"Joe\" Mayfield" <gary_mayfield@xxxxxxx.xxx>
To: "'AMSAT BB'" <amsat-bb@xxxxx.xxx>
Cc: 'Robert Creason' <rcreason-1@xxxxxxx.xxx>
Subject: [amsat-bb] I thought it was Vaporware
Message-ID: <BAY173-DS1241801DA0E2683873ED058ACD0@xxx.xxx>
Content-Type: text/plain; charset="us-ascii"
I am not associated with this item in anyway...
At one point in time I had a Yaesu FT-480. It was a good rig that helped me
make many satellite contacts.
I had read about the console, but no one had ever seen one and we just
assumed it didn't really exist.
We were wrong as one is on sale on eBay right now:
http://www.ebay.com/itm/YAESU-SC-1-FT480R-FT780R-/191015020883
There was a time when that truly would have been the ultimate satellite
station!
73,
Joe kk0sd
------------------------------
Message: 2
Date: Fri, 27 Dec 2013 07:06:39 -0700
From: James Duffey <jamesduffey@xxxxxxx.xxx>
To: Gary Joe Mayfield <gary_mayfield@xxxxxxx.xxx>
Cc: AMSAT BB <amsat-bb@xxxxx.xxx>, Robert Creason
<rcreason-1@xxxxxxx.xxx>
Subject: [amsat-bb] Re: I thought it was Vaporware
Message-ID: <6D960703-1162-420A-B4C7-A64C4A9582EC@xxxxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
I have the FT480, FT780 and FT680, all bought inexpensively. The FT480 and
FT780 are very nice satellite rigs, among other things, on FM they can be
tuned in 1kHz steps, ideal for properly correcting Doppler.
They are also good general QRP VHF rigs, with 10 Watts out and a reasonable
receiver. My units are both off a bit in frequency, not too bad for a 30
year old rig.
I have seen the pair with a console a couple of times at hamfests over the
years, but they are not common. - Duffey KK6MC
On Dec 27, 2013, at 6:35 AM, Gary Joe Mayfield <gary_mayfield@xxxxxxx.xxx>
wrote:
> I am not associated with this item in anyway...
>
>
>
> At one point in time I had a Yaesu FT-480. It was a good rig that helped me
> make many satellite contacts.
>
>
>
> I had read about the console, but no one had ever seen one and we just
> assumed it didn't really exist.
>
>
>
> We were wrong as one is on sale on eBay right now:
>
> http://www.ebay.com/itm/YAESU-SC-1-FT480R-FT780R-/191015020883
>
>
>
> There was a time when that truly would have been the ultimate satellite
> station!
>
>
>
> 73,
>
> Joe kk0sd
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 3
Date: Fri, 27 Dec 2013 11:31:21 -0500
From: Burns Fisher <burns@xxxxxx.xx>
To: AMSAT BB <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Help with SATPC32 (maybe groups) please
Message-ID:
<CABX7KxU5_OoF=8V_wUXhdvm5D7C_yPPO4DhFGPkRjgAe=9PG1A@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Thanks to everyone...I've gotten a lot of help from many people, including
Erich Eichmann the author. I thought it would be nice close of this thread
with the model I now have in my head, confirmed by Erich.
Here is what I think I really missed: There is *always* a SatPC32 group
active, and it is the group that defines which satellites are chosen for
display in the ABC buttons. You could have multiple SatPC32 groups
associated with the same data file, but each with different satellites
chosen, if that is what you wanted. Then you select a different group to
get the different configuration. But (the key to me) is that you can not
use a group to chose satellites from multiple different data files at the
same time. And you don't really chose a data file for display without it
being associated with a group.
Erich also pointed out to me that there are 4 different configurations
(chosen by setup) which essentially multiply by 4 the number of different
groups that are available.
Thanks again to everyone. And in case anyone missed it, AO-73 (named DNEPR
OBJECT AE - As in 'the AE35 unit') is now in Celestrak's amateur.txt and
also in 'nasa.all' which SatPC32 sources from AMSAT.
("HAL <http://www.imdb.com/name/nm0706937/?ref_=tt_trv_qu>: I've just
picked up a fault in the AE35 unit. It's going to go 100% failure in 72
hours.")
73,
Burns W2BFJ
On Thu, Dec 26, 2013 at 6:08 PM, Burns Fisher <burns@xxxxxx.xx> wrote:
> Hi Everyone,
>
> I've used SatPC32 for a number of years, but I have been using it in
> "simpleton" mode, it would seem. Now that AO-73 is in the "cubesat.txt"
> keps file rather than amateur, I apparently have to take the next step in
> my education about this program.
>
> Here the current general question: How do "groups" work. I have googled,
> and the term seems to be used both for Celestrak groups and for the groups
> in SatPC32 (e.g. Diverse, Standard, etc). I mean the SatPC32 groups. What
> I want to do is to have a number of satellites selectable with the A,B,C...
> buttons in the lower right. But right now, I have to pull down the
> satellites menu and select "cubesat.txt" to get AO-73 and "amateur.txt" to
> get, say, VO-52 and SO-50. And whenever I switch to a new keps file, all
> the satellites I have selected as current for the previous file disappear
> from the right column.
>
> Somehow, I suspect that 'groups' are the answer to this, but I can never
> get the "edit" function under groups to do anything terribly useful. It
> looks like I can edit "standard", for example, so that if selected, it uses
> the satellites selected from amateur.txt or cubesat.txt but not both.
>
> Ok, so when I get into a pickle like this, it is usually because I don't
> understand the concept or the model that the program is using. So rather
> than (or as well as) "click x, select y, edit xxx.txt" the kind of help I
> hope I can get would be include "how are groups supposed to be used?" And
> by the way, I have read the manual, and it again seems to assume that I
> know what groups are supposed to be.
>
> Thanks in advance,
>
> Burns, W2BFJ
>
------------------------------
Message: 4
Date: Fri, 27 Dec 2013 13:01:26 -0500
From: Robert Bruninga <bruninga@xxxx.xxx>
To: David Johnson <dave@xxxxxxxxxxxxxxxxx.xxx>, Peter Budnik
<kb1hy2@xxxxxxx.xxx>
Cc: AMSAT-BB@xxxxx.xxx
Subject: [amsat-bb] Re: AO-73 Question (mode efficiency?)
Message-ID: <91fde89ffb877942f6456f0e9288fbc6@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
> The satellite is only in transponder mode when it is in eclipse..
> In full sunlight it is in beacon mode only.
Just curious about the overall design goals of this operating mode?
Putting solar energy into and then taking it out of batteries suffers
about a 30% loss in efficiency. All else being equal it is usually better
to use solar power directly if possible.
Maybe the value of this mode is for hams to use the satellite in the
evenings during play time instead of during the day when schools and
students could benefit.
Just curious.
Thanks
Bob, WB4aPR
------------------------------
Message: 5
Date: Fri, 27 Dec 2013 18:28:36 -0000
From: "Graham Shirville" <g.shirville@xxxxxxxxxx.xxx>
To: "Robert Bruninga" <bruninga@xxxx.xxx>, "David Johnson"
<dave@xxxxxxxxxxxxxxxxx.xxx>, "Peter Budnik" <kb1hy2@xxxxxxx.xxx>
Cc: AMSAT-BB@xxxxx.xxx
Subject: [amsat-bb] Re: AO-73 Question (mode efficiency?)
Message-ID: <F76F6DC22E9540C8B9D4423E4B79D8EE@xxxxxxx.xxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Hi Bob,
Yes the mission requirements are exactly as your last paragraph. We have a
dual mission and needed a simple, autonomous, on board system to make the
change between the two modes. The sunlight/eclipse transition is fairly
easy to detect and forms a valid decision criteria.
The system current in daylight is around 220mA and when in eclipse it is
"only" 140mA. If the transponder is in use then this can rise momentarily up
to 250mA but the average eclipse consumption is probably only around 160mA
as many of the eclipse periods are over the sea or unpopulated land areas.
Presently the power budget seems pretty good and we are hopeful that the
solar cells and battery will maintain their present performance for some
time to come. The bus voltage is usually around 8.3V at the end of the
sunlight period and drops only to around 8.1V at the end of eclipse.
Apparently this equates to less than 5% discharge.
cheers
Graham
G3VZV
-----Original Message-----
From: Robert Bruninga
Sent: Friday, December 27, 2013 6:01 PM
To: David Johnson ; Peter Budnik
Cc: AMSAT-BB@xxxxx.xxx
Subject: [amsat-bb] Re: AO-73 Question (mode efficiency?)
> The satellite is only in transponder mode when it is in eclipse..
> In full sunlight it is in beacon mode only.
Just curious about the overall design goals of this operating mode?
Putting solar energy into and then taking it out of batteries suffers
about a 30% loss in efficiency. All else being equal it is usually better
to use solar power directly if possible.
Maybe the value of this mode is for hams to use the satellite in the
evenings during play time instead of during the day when schools and
students could benefit.
Just curious.
Thanks
Bob, WB4aPR
_______________________________________________
Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 6
Date: Fri, 27 Dec 2013 13:28:00 -0600
From: Stefan Wagener <wageners@xxxxx.xxx>
To: Robert Bruninga <bruninga@xxxx.xxx>
Cc: AMSAT BB <AMSAT-BB@xxxxx.xxx>
Subject: [amsat-bb] Re: AO-73 Question (mode efficiency?)
Message-ID:
<CAKu8kHDADdro-U7m2HNMFZ09FED1kZbXSw69WS1A6dWKfux6bA@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
>From Graham earlier in November on the BB:
............................
Hi All,
Yes in telemetry (also known as educational) mode we have around 300mW and
this is a much higher average RF output than when in amateur (also known as
transponder) mode.
Total current drain is therefore greater when in educational mode. This is
convenient because we had planned that educational mode would be more
useful when the spacecraft is in local daylight - ie schools would be more
likely to be open. This is the primary mission of course. Also amateurs
often have to work during the day so would appreciate the availability of
the transponder during the local evening passes.
We were not, before launch, 100% certain that we would have a good enough
power budget to run the transponder during every eclipse period but, at the
moment, this seems to be ok - we still have quite a positive power budget.
Its a bit late here and we are quite tired after three very hectic days but
I hope the above explanation makes some sort of sense:)
best 73
Graham
G3VZV
On Fri, Dec 27, 2013 at 12:01 PM, Robert Bruninga <bruninga@xxxx.xxx> wrote:
> > The satellite is only in transponder mode when it is in eclipse..
> > In full sunlight it is in beacon mode only.
>
> Just curious about the overall design goals of this operating mode?
> Putting solar energy into and then taking it out of batteries suffers
> about a 30% loss in efficiency. All else being equal it is usually better
> to use solar power directly if possible.
>
> Maybe the value of this mode is for hams to use the satellite in the
> evenings during play time instead of during the day when schools and
> students could benefit.
>
> Just curious.
> Thanks
>
> Bob, WB4aPR
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
------------------------------
_______________________________________________
Sent via amsat-bb@xxxxx.xxx. Opinions expressed are those of the author.
Not an AMSAT member? Join now to support the amateur satellite program!
http://amsat.org/mailman/listinfo/amsat-bb
End of AMSAT-BB Digest, Vol 8, Issue 474
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