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Re: OSCAR 10



    Hello, I have a question regarding OSCAR 10. First, how often is
    that satellite still useable??

Lately, at least, it's usable when it's in the sun (as its batteries are
no longer really functional).  Sometimes, one sees lots of fading and/or
polarity flips, but that may depend on what kind of antenna one uses.

       Second, if I have 50 watts of power on the uplink, what is the
    MINIMUM size antenna I could use and what would be the MINIMUM
    size I would need for the downlink antenna???

It depends on where it is in its orbit.  At perigee, it doesn't take much,
i use a homebrew four element-pair LPVA and have been able to work a few
stations with that.  But longer antennas with Az-El tracking are much better.
You can tripod mount something and track by hand to get started, if you can
get your rig running out in a comparatively open space somewhere.  Then if
you know you can hear things, there's more incentive to put something more
substantial together.  But i've often found AO-10 quiet at those times,
with only really getting use after it's not longer quite in range for my
meager antenna setup to reach.  (But then again, i've got 30+' of RG-8
up to the antenna and fixed elevation; it's not hard to do better than 
that!)

Tonight is an unusally low pass over the West Coast, and by Thursday, the
'LEO' capable AO-10 users should be able to make transcontinental contacts.
I've heard England from California with 6dB theoretical gain on a couple
of occasions.  So if you are willing to operate AO-10 as if it were a LEO
satellite, you might be surprised at what you can do with just a slightly
better antenna if you can find others to join you.  Analogous to EME
operation, i hope some of you 'big guns' will get on AO-10 at these
times, and pick out a few of us 'peanut whistle' stations out of the
noise with your excellent antennas and receivers.

I think more experience with this mode of operation might be valuable to
explore and discuss, in terms of making P3D accessible to a larger segment
of the amateur community.

		         -- KD6PAG  (Networking Old-Timer, Satellite QRPer)

-------------------------------------------------------------------------------
KD6PAG SatTrack V3.1 Prediction Summary (sunlit LEO passes)

Satellite #14129  : AO-10 (OSCAR 10)
Data File         : tlex.dat
Element Set Number: 606 (Orbit 9586)
Element Set Epoch : 01Dec99  08:56:30.569 UTC   (6.6 days ago)
Orbit Geometry    : 4015.26 km x 35436.97 km at 27.164 deg
Propagation Model : TLE Mean
Ground Station    : Berkeley (SSL), CA, USA   ---   CM87VV
Time Zone         : UTC (+0.00 h)
Downlink Frequency: 145.9000 MHz

   UTC    Azimuth  Elev    Range  Sun Ang  Doppler  Loss  Phs Md V
           [deg]  [deg]     [km]    [deg]   [kHz]   [dB]

Wed  08Dec99  ---  Orbit 9602

04:17:05   183.1   31.2   5677.1     72.0   +0.62  150.8    2  B V
04:25:20   141.2   40.1   5852.2     36.5   -0.92  151.1    5  B V

Thu  09Dec99  ---  Orbit 9603

03:20:42   210.8    4.2   8277.2    120.4   +2.08  154.1  252  B V
03:42:42   131.8   32.2   6115.6     38.5   -1.01  151.5    4  B V

Fri  10Dec99  ---  Orbit 9606

02:50:30   165.5   22.3   6149.6     79.1   +0.57  151.5    0  B V
03:04:15   110.5   21.4   7155.9     28.2   -1.54  152.8    5  B V

Sat  11Dec99  ---  Orbit 9607

01:52:20   199.9    3.2   9128.4    127.8   +1.95  154.9  250  B V
02:22:35   103.8   13.1   7778.3     28.8   -1.61  153.5    5  B V

Sun  12Dec99  ---  Orbit 9609

01:09:14   192.6    3.6   9373.5    128.2   +1.82  155.2  249  B D
01:42:14    95.3    4.5   8714.1     27.0   -1.72  154.5    5  B V

Mon  13Dec99  ---  Orbit 9611

00:24:41   188.1    3.0   9989.2    131.2   +1.73  155.7  248  B D
00:52:11   110.8    4.0   7942.2     49.6   -1.03  153.7    2  B D

Mon  13Dec99  ---  Orbit 9613

23:42:54   178.6    3.3  10089.6    128.7   +1.55  155.8  248  B D
23:59:24   137.3    3.7   8025.0     85.2   +0.23  153.8  254  B D


Satellite #14129  : AO-10 (OSCAR 10)
Data File         : tlex.dat
Element Set Number: 606 (Orbit 9586)
Element Set Epoch : 01Dec99  08:56:30.569 UTC   (6.6 days ago)
Orbit Geometry    : 4015.26 km x 35436.97 km at 27.164 deg
Propagation Model : TLE Mean
Ground Station    : Houston (JSC), TX, USA   ---   EL29HS
Time Zone         : UTC (+0.00 h)
Downlink Frequency: 145.9000 MHz

   UTC    Azimuth  Elev    Range  Sun Ang  Doppler  Loss  Phs Md V
           [deg]  [deg]     [km]    [deg]   [kHz]   [dB]

Wed  08Dec99  ---  Orbit 9602

04:16:47   239.9   22.4   6254.4     89.4   +1.64  151.7    2  B V
04:25:02   225.7   54.2   5236.5     54.0   +0.25  150.1    5  B V

Thu  09Dec99  ---  Orbit 9604

03:32:57   231.4   22.6   6141.8     96.5   +1.76  151.5    1  B V
03:43:57   192.5   62.7   4992.7     46.3   -0.26  149.7    5  B V

Sat  11Dec99  ---  Orbit 9608

02:20:15   135.2   51.0   5181.7     39.0   -0.97  150.0    4  B V
02:23:00   118.6   47.6   5588.0     27.5   -1.41  150.7    5  B V

Sun  12Dec99  ---  Orbit 9609

01:21:07   206.7   19.7   6557.1    114.1   +1.90  152.1  254  B V
01:43:07   102.9   32.9   6460.8     20.9   -1.80  151.9    6  B V

Mon  13Dec99  ---  Orbit 9611

00:27:37   215.9    4.5   9368.8    140.8   +2.24  155.2  249  B V
01:00:37    99.8   23.7   6906.3     23.7   -1.83  152.5    5  B V

Mon  13Dec99  ---  Orbit 9613

23:42:29   211.4    4.9   9976.9    144.4   +2.15  155.7  247  B D
00:20:59    91.0   11.7   8089.3     20.4   -2.00  153.9    6  B V

Tue  14Dec99  ---  Orbit 9615

22:55:11   209.4    4.4  11137.0    149.6   +2.04  156.7  245  B D
23:39:11    87.8    3.8   8792.1     22.4   -1.98  154.6    5  B D

Wed  15Dec99  ---  Orbit 9617

22:13:24   200.7    7.6  10938.7    147.0   +1.91  156.5  245  B D
22:49:09   102.6    5.6   7767.0     45.0   -1.39  153.5    2  B D



Satellite #14129  : AO-10 (OSCAR 10)
Data File         : tlex.dat
Element Set Number: 606 (Orbit 9586)
Element Set Epoch : 01Dec99  08:56:30.569 UTC   (6.6 days ago)
Orbit Geometry    : 4015.26 km x 35436.97 km at 27.164 deg
Propagation Model : TLE Mean
Ground Station    : New York, NY, USA   ---   FN30AS
Time Zone         : UTC (+0.00 h)
Downlink Frequency: 145.9000 MHz

   UTC    Azimuth  Elev    Range  Sun Ang  Doppler  Loss  Phs Md V
           [deg]  [deg]     [km]    [deg]   [kHz]   [dB]

Wed  08Dec99  ---  Orbit 9602

04:18:53   248.1    4.0   8039.6     86.0   +1.61  153.8    3  B V
04:24:23   242.3   18.9   7129.2     68.7   +1.04  152.8    5  B V

Fri  10Dec99  ---  Orbit 9606

02:53:59   232.4   10.4   7238.3     92.9   +1.68  152.9    2  B V
03:02:14   215.6   34.4   6046.2     62.6   +0.57  151.4    5  B V

Sat  11Dec99  ---  Orbit 9607

02:07:25   229.6    3.3   7887.6    107.9   +2.01  153.7  255  B V
02:23:55   183.5   45.7   5775.0     46.2   -0.28  151.0    6  B V

Mon  13Dec99  ---  Orbit 9612

00:49:13   195.4   21.6   6230.4     88.6   +1.16  151.6    1  B V
01:02:58   134.4   37.6   6303.4     32.7   -1.18  151.7    6  B V

Tue  14Dec99  ---  Orbit 9615

23:13:40   202.1    3.7   8421.3    123.1   +1.93  154.2  252  B V
23:41:10   109.2   20.0   7517.7     27.9   -1.61  153.3    6  B V

Wed  15Dec99  ---  Orbit 9617

22:43:43   156.2   16.3   6622.3     81.9   +0.41  152.1  256  B V
23:00:13   100.8   11.6   8260.0     27.2   -1.71  154.1    6  B V

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