[TowerTalk] Using Noalox on aluminum boxes

Bruce Jungwirth k0son at frontiernet.net
Sun Sep 21 16:30:36 EDT 2008

Don't worry about those gaps in the box. Even at 10 meters, the size of the 
seam openings is small compared to the wavelength of 10 meters so they won't 
act like slot antennas. If you were running in the UHF region or above, then 
you could have slot antennas, & the seams need to be very tight or sealed 
with copper tape.

Bruce K0SON
----- Original Message ----- 
From: "Pete Smith" <n4zr at contesting.com>
To: <towertalk at contesting.com>
Sent: Sunday, September 21, 2008 12:04 PM
Subject: [TowerTalk] Using Noalox on aluminum boxes

> Is it considered good practice or unnecessary lily-gilding to use Noalox 
> on
> the joints of minibox-style unpainted aluminum boxes that are used for
> housing antenna switching relays and similar hardware in an SO2R
> system?  Does it offer any improvement in shielding at HF, or are the
> cracks small enough and the electrical contact offered by the 4
> self-tapping screws on each box sufficient to prevent any significant 
> leakage?
> 73, Pete N4ZR
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