|
|
|
|
| VHF: Canal 77 |  |
 |
 |
 |
 |
|
|||||||
| Avisos | ||||||
|
|
|
Herramientas | Estilo |
|
#11
09-02-2015, 13:02
|
||||
|
||||
Re: Proyecto OpenPlotter
Cita:
Collinear Coax AIS antenna - Recommended AIS, antenna, RTL-SDR, Software Defined Radio, 820T, testing, review, DIY guideLength about 120 cm, costs 1 euros, works just as good as an 80 euro discone antenna. The antenna and the RTL stick fits into your pocket for AIS reception anywhere you can bring your laptop with you. The best is that you only need to buy enough coax to reach from your laptop to your antenna site, plus 1 metre for the antenna, and you have a working AIS receiver. The antenna is basically two 61 cm long coax cables, connected the wrong way for the antenna bit (center to braid and braid to center). You need to make four connections, two in the antenna proper and two at the bottom of the antenna to the coax cable you use to bring the signal to the RTL stick. Twist the connections or use quick connectors; both work. For permanent installations you’re advised to use shrink-wrap (plastic tube that melts with a lighter) or lots of electrical tape. As the antenna is flexible you need some form of support: the bottom half of a two-piece fishing rod or a PVC pipe sealed at one end is a permanent solution. - Top section: measure 616 mm from end of coax, - Mark with electrical tape, plus about 5 centimetres one end to have enough wire for connections. - Bottom section: 616 mm for the antenna, plus enough both ends for connections. - Cut the outer plastic cover lengthwise, carefully not to cut the center of the cable. - Remove the plastic outer shell. - Separate the braid from the center cable. - Twist the braid. - Cut off enough plastic cover from the center that you can wrap the braid around it. Cut it above the braid end so you can keep them separate. - If you bend the center a little bit out from the cable that makes wrapping easier. Veo que hay dos partes ¿activas? que se unen a un coaxial que va al receptor SDR. ¿este coaxial último puede tener cualquier longitud?. ¿sirve esta antena, con sus limitaciones, para una radio DEGEN? ¿Coaxial de 75 o de 50 Ohms?. He visto, en uno de esos enlaces, que hay quien recomienda 50? Muchas gracias¡¡¡¡¡ 
__________________
Navigare necesse est ............. |
|
|
Modo de árbol