If he is using the SAME antenna for both glideslope and localizer/VOR
its understandeable how one or BOTH recievers are doing poorly.

Correct me if I'm wrong.. Glideslope receivers are UHF band (400 mhz
range??) while the LOC/VOR is in the VHF band (109-117 mhz range). He
did not explicitly state he had glideslope, using the term "ILS" which
im not sure if he's referring to Loc/GS or Loc alone.

The a/c is a lancair 320 (if the N number search is correct). Where is
the "per plans" antenna location for the nav and GS antennae?

Dave

RST Engineering wrote:

As Taxsrv noted, your current antenna "sucks for both VOR and ILS". Let's
explore that before we design you something that will suck for the same
reasons.

Jim


"billkennedy3" wrote in
message .. .

Questions for Jim Weir, or other knowledgeable folks:

I've got a couple of questions about an ideal antenna for ILS use.

My Comm/Nav radio uses one antenna for both ILS and VOR. I rarely use
VOR so I'd like to optimize an antenna for ILS use (a side note -- my
current antenna sucks for both VOR and ILS). My plane is fiberglass.
I'm thinking a "V" shape may give me a stronger lobe toward the front
but don't know what the angle should be.

So, my questions

Is a "V" array a good idea for directional gain? What angle?

Should the top of the "V" be oriented forward to maximize reception
from that direction?

How long should the elements be for optimum reception of a 109MHz
signal?

Thanks – Bill Kennedy
N42BK


--
billkennedy3
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