[time-nuts] GPS antenna selection - lightning

jimlux jimlux at earthlink.net
Mon Aug 8 10:00:29 EDT 2016


On 8/7/16 8:06 PM, Bill Hawkins wrote:
> This thread grows old, so here's one person's summary:
>  Marine supply stores sell rolls of 4 inch
> wide copper strap for connecting the mast on the wheelhouse cabin with
> the keel of fiberglass boats. This is also the ground for all electronic
> equipment. The strap is considerably less inductive than a wire.

No - strap is about the same inductance as a wire of the same length. 
The advantage of strap is a lower RF resistance, which is important if 
the strap is part of your antenna system, because it's less resistive 
loss than a wire.

For lightning impulses, either conducted or radiated, the inductance 
dominates the voltage rise (e.g. Xl is much larger than Rac).

Strap or bar may be easier to make connections to (drill a hole in some 
1/8x1" bar, tap it, and hook your lug up)






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