A smear of Vaseline?

Clive

I was fascinated to read about your maritime radio experiences. I was impressed by being able to work the UK from South Africa on a whip aerial at 10W, was that on the key or SSB?

It was particularly interesting as at waterproofing aerial systems as I am preparing to erect a new amateur radio HF aerial myself. I am going for an end fed 1/2 wave aerial. I have wound a 49.1 UnUN and put it in a plastic box. I am concerned about water getting in the box so thinking about putting it in my loft just inside the gutter board and then feeding the aerial out. I am also going to wind a choke to go at the end of the aerial to extend the coverage to the 3.5-3.8 MHz., I need to go to Screfix to get some 25mm plastic conduit for the core. The UnUn has a SO 239 socket which I will feed with a metre of RG 213 Co-Ax in to a common mode choke and then RG213 to a auto ATU (or should that be an AMU). I just need to put up a scaffold pole at the end of the garden to act as a mast. 

Conventional roof top T.V. aerials have a drain hole fitted at the lowest point in the plastic connector box in most cases. Can this be used on amateur radio equipment as well?

A drain hole prevents condensation build up and assists rain ingress removal.

Z.

Conventional roof top T.V. aerials have a drain hole fitted at the lowest point in the plastic connector box in most cases. Can this be used on amateur radio equipment as well?

A drain hole prevents condensation build up and assists rain ingress removal.

Z.

The same tricks are used but as ham radio has thin slices of the bands allocated at all sorts of frequencies, so antennas range from hundreds of metres long for VLF to sub millimeter for the microwavers and everything in between,

https://rsgb.org/main/operating/band-plans/

unlike the TV bands that are just UHF, the techniques have to vary with the scale.

Mike

(G7VZY)