Re: 23 cms antenna
I have build a number of outdoor combiners, but never attempted to seal them "watertight". I'd recommend you drill a ventilation hole - ø3-4 mm - facing downwards and let gravity do the rest (as parajumpers saying goes).
Having designed outdoor electronics and housing for many years, I allways seal to avoid/reduce water ingress (seal the box), then provide for drainage/ventilation (drill a hole), so water entering in spite of all sealing efforts can leave. Rarely have I tried to make real watertight designs - as temperature changes will pump watervapour inside where it can condensate. Once trapped inside the water will only very slowly leave again.
73 Ole OZ2OE
From: Dave Cossar
Sent: Monday, February 06, 2012 5:20 PM
Subject: [ukmicrowaves] 23 cms antenna
Hi Just returned from the top of my tower 12 metres
Took down my helax for checking as well
All the Tonna F9T diploles check out well on an low readng ohmmeter
No sighn of water
I did notice up there elements 21,22, 23, 24 all missing from one of the 4 antennas….Big BURDS
And another had ele 21 missing
So slight mismatch there .
I have sprayed the combiner to get the water out and will dry it out but I can see nowhere water can get in .
II had protected it especially.
Running out of ideas, I think a replacement combiner is required , I just need a bit more reliability in the antenna
Ingen virus fundet i denne