Wednesday 7 August 2013

LBA repair work

Yesterday we showed the fallen LBA aerial #L17... the cause the mysterious step function in the data.The break itself had occurred in the elastic at the base of the northwest line. Subsequent examination suggests that this was premature deterioration (although an alternate hypothesis blames lemporidae).

Of course, upon discovering the problem, the aerial was quickly repaired. Without the exact replacement part, we had to improvise. And the photographs today show what we did.

The O-ring connects the line to the peg. Some degree of elasticity is required, as tension and flexibility are required... especially as ground movement can occur during the freeze/thaw cycle. The knot is a clove hitch and three half hitches. The line then goes back to the top. (Photo: D. McKay-Bukowski)

At the top, a knot connects the nylon to the dipole wire. Three cable ties and a fold back hold the remainder of the nylon line to provide two securing points and keep it neat. (Photo: D. McKay-Bukowski)

The repaired LBA aerial (Photo: D. McKay-Bukowski)

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