View Single Post
  #16   Report Post  
posted to rec.boats.cruising
Brian Whatcott Brian Whatcott is offline
external usenet poster
 
First recorded activity by BoatBanter: Jul 2006
Posts: 813
Default 4'/22kg Radar Antenna on Sea Ray 315 Sundancer Arch?

On Tue, 17 Jul 2007 16:51:11 -0800, Steve Thrasher
wrote:
.....
Basically it boils down to: The higher the frequency of the beam, the
higher the frequency of the PRF (Pulse Repetition Frequency) and the
shorter your pulse length the better your resolution. Antenna size only
affects the signal strength the receiver sees, for the most part. Which
is assuming it's built for the proper frequency.

....
Bill, who was a ETN2 in the old days and has forgotten most of this kind
of stuff.


Hmmm...not quite.

Here's another try:
The higher the frequency, the smaller the antenna needed to shape the
beam. A wider antenna gives a narrower horizontal beam.

Pulse repetition frequency limits max range but helps angular
depiction on a plan position indicator. Narrow transmit pulse helps
resolution, hinders max range. Bigger antenna aperture increases max
receive range.

Your turn! :-)

Brian W