Want to get into repeaters better with your Hand Held? If you have a handheld that has a detachable antenna, you're in business with a portable compact GAIN antenna with directional properties that you can build with simple materials. Having an antenna with Gain is like increasing your TX power......... NO
this works, I made one :icon_geek:
Details to follow
[ Note to Admin
please can you make a "technical" page to move this to?
]
Shit yeah, Also known as ERP (Effective Radiated Power) . e.g Formula for my base setup. Say 10-15watts from my radio into my yagi array of 18-20dBi gain = Actual tx Power multiplied and coming out of the yagi = Aprox 1,000 watts ERP. Killing my brain cells
(This is approx figures not actual worked out exact figures). :laughing4:
Sorry for the delay in the project page. I will work on it this weekend.
Keep ya socks on
DaVo, Chucky is coming over Monday ta get it all done.
(25-07-2009, 04:58 AM)King_DaVo link Wrote: [ -> ]Comon, hurry up :blob7:
Ok Ok its done. Thanks for the help admin monkey. Chill DaVo :hal:
EMERGENCY ANTENNA from coax. This is for 2 metres, but the formula is the same, just put in 477 mhz instead. This gives you a vertical 1/2 wave dipole. Another good project to improve a handhelds' performance
http://www.hamuniverse.com/vertbazooka.html
Experience has shown that you need to start 'long' with the radiating element. using a swr meter trim for lowest swr. A piece of aluminium or copper tubing can be substituted for folding the braid back over itself. To do this just trim off most of the braid and attach a tail of twisted braid to the tubing like a Neighbour sleve balun.
