Newsgroup: it.hobby.radioascolto
Titolo: Ascoltare satelliti radioamatoriali

Salve,
è da tempo che vorrei farlo... ora mi sono deciso.
Vorrei ascoltare i satelliti radioamatoriali.
Premesso che ho solo antenne verticali, vorrei sapere che possibilità ho.
Sapete indicarmi i satelliti facilmente ascoltabili?
Ho il calcolatore di ham-radio deluxe aggiornato quindi vedo da li i 
passaggi.
Fatemi sapere!
GRAZIE
I Z Ø K B A 

 Sapete indicarmi i satelliti facilmente ascoltabili?
di sicuro VO52 USB, AO51 FM
Il SO50 e AO27 un po' bassini ma ascoltabili con buona antenna
Qualche digitale ma spesso in BF solo un soffio...
ISS da tempo non la sento più...
qualche altro digitale, aprs e i NOAA interessanti per le cartine.
prova qui ho visto che c'e' qualche audio vecchio e nuovo...
http://tinyurl.com/pbkzm
trovi altri dettagli su
www.amsat.org
ciao

  Dott. Romeo ha scritto:

L'ISS è operativa a 145.825 FM in packet a 1200!!
Puoi utilizzarla per il traffixo aprs benissimo anche con una verticale, 
ma deve essere un buon passaggio!
Con una vertivale il momento migliore per trasmetere è quasi sempre a 
fine passaggio!
Cmq io con una X50 l'ho agganciata diverse volte con 20-30 watt di potenza!

 passaggi.
	Satellite transmssions can come from any direction. An "omniderctional" 
antenna would be ideal. I vertical will cover much sky, but it is 
poarized, and it has a null overhead, so gain is not too high.
	For decades, for general satelite reception, the helical antenna 
("Kraus Helix") has been used to minimize the poarization loss when it 
is not certain which polarization the the satellite signal has, nor is 
it certain which direction it will come from.
	The original Kraus helix had about 6 turns of wire (circle dimeter 
perhaps one wavelength). Shorter helicies have been used, sometimes just 
one or two turns. The 6-turn helix is directional along its axis, with 
good gain along the axis of the circles. The one or two turn helix has 
less gain, but it will cover a very wide part of the sky.
	The terminal impedance of these helicies is about 150 ohms. A 1/4-wave 
matching transformer (1/4 ength of 85 ohm impdedance line) will improve 
the standing wave ratio to 50 ohm coax transmission line.
	Angelo Campanella  W8EDR.

 passaggi.
Hello to everyone:
	Satellite transmssions can come from any direction. An "omniderctional" 
antenna is ideal. A vertical will cover much sky, but it is poarized and 
it has a null overhead, so Gain is low.
	For decades, for general satelite reception, the helical antenna
("Kraus Helix") has been used to minimize the polarization loss when it
is not certain of the polarization or the direction of the arriving 
satellite signal.
	The original Kraus helix has about 6 turns of wire (circle dimeter 
perhaps one wavelength). Shorter helicies have been used, sometimes just 
one or two turns. The 6-turn helix is directional along its axis, with 
good gain along the axis of the circles.
	The one or two turn helix has less gain, but it will cover a very wide 
part of the sky.
	The input/output impedance of these helicies is about 150 ohms. A 
1/4-wave matching transformer (1/4 ength of 85 ohm impdedance line) will 
improve the standing wave ratio (SWR) to a 50 ohm coaxial transmission line.
	Angelo Campanella  W8EDR.

 passaggi.
Hello to all:
	Correction: The Kraus helix size is approximately that the 
circumference of the circle of wire should be about one wavelength. Any 
number of turns can be used.
	Angelo Campanella  W8EDR.