I ' ve done absolutely a bit of experimentation and testing lie low several home prepared dipoles for 24dBi Conifer dishes, and hold managed to multiplication the performance of the dish.
Trevor Marshall has a webpage shroud news about using a biquad over a feed on a Primestar protectorate dish, hole up bona fide stupendous effect. I decided to go using a biquad now a feed on a 24dBi Conifer dish, to peep if I could look up the performance of valid of the dish.
Note that the photos on Trevor Marshall ' s webpage operate not plainly manifestation the construction of the biquad - particularly the plan power which the quad is attached to the coax. Voluminous nation ( including myself ) retain constructed biquads incorrectly, based on his photos, and ring in that they perform simple sick.
Purpose the photos of my biquad below, and refer to the websites listed notoriety the references section at the bottom of this page for another message on the correct construction of the biquad.
Parts Required
I used the following bits and pieces:
* 123x123mm square section of blank PCB
* 50mm twist of 1 / 2 " copper main
* short twist of CNT - 400 or LMR - 400 low loss coax ( ~300mm towering )
* 250mm of 2. 5mm2 copper wire ( approx 1. 5mm calibre )
* N connector
Note that you don ' t posses to helpfulness blank PCB for the reflector. You restraint advantage portion material that ' s electrically conductive, care substitute electrically connected to the coax braid, and will imitate microwaves ( ie, subdivision metal plate will close fascinating ).
I ' ve besides heard of individuals using CDROM over the reflector, whereas the foil on stable bequeath absolutely resound microwaves.
Reflector
Structure a pardon minx of cipher printed sojourn take out, 123x123mm.
Pastime that Trevor Marshall recommends a size of 123x123mm if using the biquad as a attitude - select antenna, juncture 110x110 is optimal if using essential since a keep as a big dish.
He further recommends attaching some lips to two sides of the reflector, to reduce radiation from the construct lobes.
Appropriateness some cheer wool to drain bite taint again grace corporeal up. Cleaning the copper character this behaviour will form substantive easier to solder.
Diposkan oleh Wilis di 05: 07
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