'Over the Top' - the 'In Practice' column, Radcom, April 2009. PDF copy on its way... -- 73 from Ian GM3SEK http://www.ifwtech.co.uk/g3sek _______________________________________________ ____________
You Know You're A Ham, If: You see an old Superfortress in full flying condition and you think, "Hmmm... four prop pitch motors." Roger, stop doing that - it hurts! -- 73 from Ian GM3SEK http://www.i
With so little ground area, you'll need to try much harder than that - but believe me, it WILL be worth it. Broad strips of radial material will definitely be better. Probably the key reference is st
That's correct. The missing image is of a pair of square plates in galvanized steel, that bolt together with interlocking fingers to make crossover connections. They're just perfect for the stock fen
Not wasting your time at all. When you are limited to short distances from the base of the antenna, a roll of mesh is equivalent to a large number of individual radials - with the advantage that you
The RF conductivity of the steel is irrelevant, because its high magnetic permeability forces almost all the RF current outward into the skin of zinc (even if the thickness of the plating is less tha
One way is to clamp the end of the roll between a pair of galvanized steel busbars, and then connect to the middle of those bars using SS hardware. Lengths of galvanized steel bar, ready drilled with
Bob, I'm trying to reply to your direct e-mail but messages are coming back "undeliverable". I will try again when condx improve :-) -- 73 from Ian GM3SEK http://www.ifwtech.co.uk/g3sek ____________
Sometimes you need a little of both. For example, a bulkhead SO239-PL259 connection will always leave a small gap between the flange and the end of the ring. There's no way to stretch tape tightly in
Right here, 3 days ago: fill that 90deg angle with an O-ring molded from a small amount of Coax-Seal, and then screw the PL-259 down onto it. This seals the circular gap where water can creep in, and
It's the same with diecast rotor gears. If the antenna is parked habitually in one direction, moving slightly in the wind, all the metal fatigue is concentrated into one or two teeth. Same here. -- 7
As promised in the earlier discussion, the web image for these useful clamps has now been updated: <http://www.rappa.co.uk/products/151-four-way-line-clamp-25-pack> The US supplier is Premier Sheep S
And what's all this stuff about burying St Joseph? Well, I Googled it. Google is *not* my friend any more. -- 73 from Ian GM3SEK http://www.ifwtech.co.uk/g3sek _______________________________________
One solution is to fix stainless studs into the threaded holes, using a permanent thread-locking compound. The studs pass clear through the holes in the lower part of the rotator shell and can be se
W7EL concluded that arrays of base-fed 1/2 or 5/8 wave verticals do not work as expected, because the presence of the other elements distorts the current distribution. The effect is small for 1/4-wav
If the tower really is of English origin, you will probably find the answers here: <http://www.qsl.net/gm3woj/latticetower.htm> -- 73 from Ian GM3SEK http://www.ifwtech.co.uk/g3sek __________________
I asked that question of the British crankup manufacturers, but they only use stainless steel for locations like harbor walls that are directly exposed to the sea. For all other locations (including
Just askin' :-) -- 73 from Ian GM3SEK http://www.ifwtech.co.uk/g3sek _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@c
[...] [...] Watch out for PST rotators in a tilt-over tower, because the water shield over the top seal is only fully effective while the tower is upright. If the tower is routinely tilted over for s
For a receive-only setup, you could easily run the 315/433MHz control signal up the coax, along with 12V DC power and the returning signals from the Beverages. A few inches of wire threaded under the