On Sat, 22 Nov 2008, n9lv wrote:
> The tried at 110' was not enough signal, -80 dbm was best, at 120' we
> hit -72 dbm so that is where it had to go. What I am looking for is
> possibly a filter that will solve the problem and allow them both to
> survive on the same tower.
We've had a number of ideas presented, and each one of the solutions
have merit in one case or another.
My personal preference would be to install the Part 15 Wireless
equipment in a NEMA box, and use the NEMA box as a Faraday cage, with
fiber optic cable connecting to the ground, and some form of power
routed up the tower in a safe fashion. The power would need to be
decoupled from the box, and again, preferably in a shielded cable. To
eliminate power noise, I'd like to go with DC, but with I^2R losses
being what they are, 48V power may not be acceptable, and 120VAC may
also constitute an unnecessary hazard on the tower, unless it is a lit
tower.
At the very least, the above would rule out power noise as a source of
interference. I did like one of the poster's suggestions to change the
interface speed to 10Mbit/s instead of 100Mbit/s; that would also
curtail emissions all over the place as a digital signal has so many
harmonics.
I hope this issue isn't RF-based.
--
Kris Kirby, KE4AHR <[EMAIL PROTECTED]>
But remember, with no superpowers comes no responsibility.
--rly
