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Satellitnyheter

HF-nätet 030413

Hej,

Varje sndag kl.10 samlas vi ngra stycken p 3740 kHz fr att ta del av
veckans mer eller mindre spnnande nyheter m.m. p satellitomrdet.

Fr dem som inte har mjlighet att delta eller lyssna d, fljer hr
rubrikerna i bulletinen 03-04-13 (7 st. checkade in, det r vl vren och
psken!).

Frgor besvaras via e-post.(henry@abc.se)

1. AO-40: Alon/Alat nu ca 50/20.

2. AO-40 DX: FM/F6CBC p Martinique igng nu.

3. UO-14 startas med brvg.

4. AO-27 r operativ, 145,850 upp, 436,795 ned (FM).

5. PCSAT r ocks igng.

6. Dubbelhopp FO-20/FO-29?

7. Program fr raketstarter UP2ISS (ny version):

http://userpage.fu-berlin.de/~uschndr/archive/LAUNCH.EXE

8. Nya matvanor p ISS nr bara SOYUZ fungerar.

9. AMSAT EchoLink:

http://www.amsat.org/echolink/

10. Columbiautredningen berknas vara klar i juni.

11. ARIANE 5 placerade tv satelliter i perfekt bana.

12. Saturnus har nu 31 mnar!

13. SMART-1, bilder:

http://members1.chello.nl/~j.vanoene/smart1.html

14. Att kl sig i rymddrkt r ett tidskrvande jobb:

http://science.nasa.gov/ppod/y2003/08apr_spacewalk.htm

15. AMSAT Journal Mars/April-numret.

73 Henry SK0TX/SM5BVF

P.S.
Bagdad-bilder live kan ses p adressen:

http://www.898vbdbat.nl/receiver/bagdadcam.htm

D.S.

Klla: SM5BVF

Kategorier
Satellitnyheter

Repeater på Månen?

Det har under en tid diskuterats om mjligheten att placera en transponder p mnen, jag publicerar ett inlgg frn en av dom ivrigaste fresprkarna.

73 Hkan SM7WSJ
—————–
Moon station or L1 satellite is not like EME !!

Hello,

The view of most amateurs on the path losses for a moon station or L1 orbit are not really true. For such large distances you don t need bigger stations than for EME ! An EME contact is completely different with a direct contact between the ground station and the satellite.

To give you some examples:

Path losses
EME: Direct (Earth -> moon-station) Difference
– ———————————————————-
70cm 261dB 197dB 64dB !!
3cm 289dB 225dB 64dB !!

Communication with a station on the moon can be done with common HAM equipment, like shown below:

On 70cm when both stations use 20W power and 13dB antennas:
– ———————————————————
Uplink 20W = +43dBm
Uplink ant. gain = +13db (medium yagi)
——————-
Uplink ERP = +56dBm
path losses = -197dB
———————
ERP on the moon = -141dB
Ant gain moon = +13dB (medium yagi)
———————
Moon reciever input = -128dBm

On 10GHz when both station use 10W power and 80cm dish ant. (36dB):
———————————————————–
Uplink 1W = +40dBm
Uplink 80cm dish = +36dB
———————–
Uplink ERP = +76dBm
path losses = -225dB
———————–
ERP on the moon = -149dBm
80cm dish moon = +36dB
———————–
Moon reciever input = -113dBm

These stations are not like EME station 🙂

When looking at L1 satellites with lets say 4x more distance the situation gets some more path losses but still possible for amateurs.

Path losses:

to Moon to L1 sat difference
70cm 197dB 199dB 12dB
10GHz 225dB 237dB 12dB

When both station increase their antenna gain by 6dB the same path conditions will stay. On 70cm the satellite can also use 6dB more power (80W), and the ground station can use an 16dB yagi instead of the 10dB yagi.

This is still within the common ham possibility.

On 10GHz the ground station can use a 1,5m dish instead of the 80cm, and the satellites power and antenna could be increased to overcome its 6dB. 🙂

This is all well within the normal amateur equipment, and still far below the needed EME equipment 🙂 What most
people think More away from the moon is more difficult than EME… is not always true 🙂

So, when do we start to build the first Moon station ? 🙂

73 de PE1RAH, William

Klla: PE1RAH

Kategorier
Satellitnyheter

Amsat Echolink

Nu finns det mjlighet fr dom som inte ftt upp sina satellitantenner att ven mta likasinnade ver ntet via (Voice)

mvh Hkan SM7WSJ

Announcing a new Internet service from AMSAT.ORG — an EchoLink conference server, *AMSAT*.

EchoLink is a Voice over IP system that lets amateur radio operators (only) talk to each other over theInternet. It can be used by individuals at their computers, or via simplex radio links, or through linked repeaters. It s very easy and fun! The software you need to communicate with EchoLink and more information about EchoLink are both available on the net.

A conference server allows many operators, links, and repeaters to share the same conversation. The new *AMSAT* conference server provides a place for satellite operators world-wide to congregate and chat. The server is up continuously. All amateurs are invited to
connect and give it a try.

73 -Paul
kb5mu@amsat.org
AMSAT VP, Electronic Publications

Klla: amsat

Kategorier
Satellitnyheter

AO-40 Update

AO-40 Update, 2003-04-07

ALON/ALAT is now 45/3 degs. We are beginning to raise ALAT to 20 degs. This will take about a week. Once we are at ALON/ALAT = 45/20 and have verified this position, we will turn off the passband and magnetorquer, and begin drifting past the sun, toward ALON/ALAT ~ 315/20.

Depending on final spin rate, the drift should take approximately a month. Once we reach this ALON, we will lower ALAT to 0 and passband will be restored, moved to the early portion of the orbit. We will then begin chasing the sun back to ALON/ALAT = 0/0.

W4SM for the AO-40 Command Team

Klla: amsat

Kategorier
Satellitnyheter

Satellit DX på Svalbard

Vi mste ju ta tillfllet och uppmrksamma killarna SM1TDE SM0LQB SM0BSO som aktiverade JW via satellit!. Efter att ha lst artikeln i QTC om strapatserna s kan man bara sga att man r mycket imponerad.

Hkan SM7WSJ

Klla: QTC