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G8MNY > TECH 13.08.04 19:27l 79 Lines 3287 Bytes #999 (0) @ WW
BID : 5384_GB7CIP
Read: GUEST
Subj: 13cms Yagi from Pringles Can
Path: DB0FHN<DB0MRW<DB0WUE<DK0WUE<DB0RES<ON0AR<GB7CIP
Sent: 040813/1722Z @:GB7CIP.#32.GBR.EU #:5384 [Caterham] $:5384_GB7CIP
From: G8MNY@GB7CIP.#32.GBR.EU
To : TECH@WW
From : KB9MWR (Coments added 2-May-04)
2.4 GHz Pringles Can Yagi Antenna (12-15 dBi)
Parts List:
Part Approx Cost
All-thread, 5 5/8" long 1/8" OD $1.00
two nylon lock nuts $0.10
five 1" washers, 1/8" ID $0.10
6" aluminium tubing, 1/4" ID $0.75
female N connector $3.00
1 1/2" piece of 12-gauge solid copper wire -
a tall Pringles can (any flavour) $1.50
Scrap plastic disc, 3" across (like another Pringles lid) -
TOTAL: $6.45
Required Tools:
Ruler, Scissors, Pipe Cutter/Hack saw, Heavy Duty Cutters, Hot Glue Gun,
Soldering Iron.
Front Collector Construction:
Mark and cut four pieces of tubing, about 1 15/64 inches (a 1/4 wavelength).
Cut the all-thread to 5 /58 inches. Pierce a hole in the Pringles can lid big
enough for the all-thread to pass through.
Cut a 3" plastic disc just big enough to fit snugly inside the can. Poke a hole
in the centre of it, and slip it over the lengths of pipe.
Now assemble the pipe. The pipe is a sandwich that goes on the all-thread as
follows:
Nut, lid, washer, pipe, washer, pipe, washer, pipe-with-plastic, washer, pipe,
washer, nut.
Tighten the nuts to be snug.. you now have the front collector.
Preparing the Can:
Wipe out the can and measure 3 3/8 inches from the bottom of the can. Cut a
hole just big enough for the connector to pass through. This "sweet spot" is
usually directly between "Sodium" and "Protein."
Element Construction:
Straighten the heavy copper wire and solder it to the connector. When inside
the can, the wire should be just below the midpoint of the can (1 1/16").
Hot glue or use the nut and washer if your N connector has one to hold the
connector in place.
Finally insert the collector assembly into the can and close the lid. The
inside end of the pipe should not touch the copper element; it should be just
forward of it. If it touches, your all-thread is probably to long.
There you go. Keep in mind when connecting your coax that you're screwing into
cardboard. It's very easy to forget and accidentally tear the wall of the can.
Suggested Use:
High Speed Amateur Packet Radio Using Part 15 Wireless Devices:
http://www.qsl.net/kb9mwr/projects/wireless/plan.html
Or for Amateur TV. Radio Shack sells Part 15 2.4 GHz Audio/Video senders, aka
WaveCom Jr.
From : KB9MWR
------------------------------------------------------------------------------
Trev VK5BWF, noted that six inches of tubing will not make 4 pieces at almost 2
inches long, and even if they did would not fit a 5.625 rod.
He thought about 3 cm should be the pipe length, and maybe the three front
washers should be about 3 cm , with the fourth a bit larger.
Take care, kindest regards. DE
Trev VK5BWF@VK5ALE.#EYP.#SA.AUS.OC Locator PF75WG
Why don't U send out an interesting bul?
/QSL
73 De John, G8MNY @ GB7CIP
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