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Ever wonder why "The Star Duster" required " at least 10'-0" of 1" thrd. pipe or the 1-3/16" dia. tubing to be below the attch. point of coax feed line with the coax symmetrically running through it ? Sure, you know the base was threaded or could be used with stub end piping, this was not just a "Cool Design" intended to sell their product, though it does resemble the Appllo Space Capsule. It's a very simple way to match and keep from resonating to the coax, just refer to Chapter 3, page 115, of The ARRL Antenna Book, Gerald L. Hall, K1TD. Detuning Sleeves.

This may be a simple inexpensive cure to the RFI coming back through the coax.

[QUOTE="Redbeard U812, post: 639884, member: 52802"] Ever wonder why "The Star Duster" required " at least 10'-0" of 1" thrd. pipe or the 1-3/16" dia. tubing to be below the attch. point of coax feed line with the coax symmetrically running through it ? Sure, you know the base was threaded or could be used with stub end piping, this was not just a "Cool Design" intended to sell their product, though it does resemble the Appllo Space Capsule. It's a very simple way to match and keep from resonating to the coax, just refer to Chapter 3, page 115, of The ARRL Antenna Book, Gerald L. Hall, K1TD. Detuning Sleeves. This may be a simple inexpensive cure to the RFI coming back through the coax. [/QUOTE]

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