Antenna ladder line spacer insulator set
of approx. 120 pcs - this shall allow you building your own low loss transmission line of approx. 33m / 110 ft length.
These spacers are intended to offer a budget solution for building your own transmission lines.
The packing method, the shipment method are tailored to reduce the cost so as to offer a minimal budget solution.
1) Not a 3D printed, but rather factory made
2) Made from UV stable material, intended to be
used exposed to UV
3) Unlike most of 3D printed spacers tends to flex
and return to its shape rather than break or remain deformed
4) Extremely lightweight, minimal wind resistance,
results less antenna wire sag as compared to other window/ladder line types
5) Due to maximised air gap opening, the Z of the
line is less influenced by the rain / environment changes, as compared to
conventional lines
6) Overall length 70mm, with 60mm distance between conductor centers -
expected to be 450 ohm
7) Can be used for QRO as well as QRPP
8) Best suits 3mm (outside diameter) wire (THHN #12), can be
used with a smaller diameter wire (may need to use small gauge cable ties to
tighten the grip)
9) Most often used with 30 cm or similar spacing,
the set should suffice for making a bit less than 33m (110 ft) of ladder line. Using somewhat smaller spacing is recommended in high wind areas
10) Extremely low visual profile, blends well into
the environment, unlike the standard "window line"
11) Almost impossible to break using pulling or
bending moment using your fingers - I tried but did not have any luck - please
do let me know if you manage to break it
12) Intended to be used with a regular insulated
wire - as per photos.
13) Not intended to be used with a bare wire
without an insulation - as there is nowhere to attach reliably because of there
being no friction. Surely the inventive minds will come with alternative ways
to attach the spacer to the bare wire e.g. using "liquid nails" or
other type of glue with RF neutral properties - however be aware this is not
the recommended application/ results may vary.
14) A single spacer was tested to hold the weight of two white bricks without braking - see attached photo. In this test it broke off when the third brick was added..
15) Presently the spacers are in use in KL7, VE and other cold climate countries, however there is no sufficient information available for how these spacers behave in extreme low temperatures/ continuous exposure to snow and ice. If that's your intended application/ operating environment, you are buying these at your own risk. In VK2 I have limited means of doing such testing :-). I can only share that when exposed to minus 19 C (minus 2 F) in a freezer continuously for weeks, these spacers do not lose their elasticity, do not become fragile and remain very difficult to break.
Note you will have to supply your own wire - this sale is for the spacers only (approx. 120 pieces).