Jeff - Where can you experience a situation where you have line-of-sight, but poor fresnel clearance, and have no communications path (assume VHF and UHF, not microwave)? Is there ever a case?
We've got a link path that an analysis indicates "absolutely no way" yet it works just fine (UHF). The obstructions are numerous and large, but they are some distance from either site. Then I've seen other paths (UHF) where a somewhat mild obstruction causes grief, but the obstruction is close-in to one of the sites. Can you shed some light on why this happens? Chuck WB2EDV ----- Original Message ----- From: "Jeff DePolo" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Saturday, August 09, 2008 4:14 PM Subject: RE: [Repeater-Builder] Height Gain figure > > It's not as simple as that. If the receiver and transmitter are > line-of-sight with full Freslen clearance, going any higher buys you > nothing, you just have more line loss. > > If the transmitter and receiver aren't LOS, going higher may help clear > intervening terrain obstructions, but how much improvement is realized > will > vary depending on the obstruction. If going up an extra 100' helps you > clear a near-by obstruction, the improvement can be significant. > >
