[CW] 17m monoband yagi

Sat, 3 Jan 2004 10:26:17 -0500

The ARRL Antenna Book, the Radio Handbook, the ARRL Handbook all have
antennas for 21 MHz and other bands.  Simply scale the dimensions of the
length of the elements, the interelement spacing and the matching settings
(capacitor, or gamma match hairpin length) and you will have a beam for 18
MHz.  Same for other frequencies.

Maybe a simple 2 element beam beam for 18 MHz would be a good start?  If you
have a wire beam already made, you could buy some white PVC plumber's pipe
at the hardware store and put the wires inside and then mount the beam to a
small rotor...

How about a 2 element over 2 element?  That would give you an outstanding
signal especially at ranges over 4,000 miles where the 3 element beams start
to not deliver a signal.  Can you build a rotating support for this? Maybe
the cost spent in a heavy rotating support could be spent in other ways?

How about a series of supports for your antenna, but make them wire beams?
If you had a central support and then six surrounding supports of the same
height, you could make six beams, perhaps log periodics, buy a six pole
antenna switch (for the six antennas) and have "instant azmith steering"
every 60 degrees around the globe.

One very excellent book for antennas is "HF Antennas for All Locations" - by
Moxon, available from ARRL or RSGB.

73

DR

----- Original Message -----
From: "Justin Grenier" <[email protected]>
To: "CW Reflector" <[email protected]>
Sent: Saturday, January 03, 2004 9:56 AM
Subject: [CW] 17m monoband yagi

Greetings,

Not having much luck finding plans for a 17m monoband yagi...I would like to
construct one with 3 or 4 elements.  Most of what I have come across is a
bit vague for the beginning antenna builder.  I am having trouble
envisioning the mast-to-boom, boom-to-element, and feedpoint detail.  What
needs to be insulated from what?  My repertoire of homebrew antennae is
limited to those of wire design.  Any insight and/or direction will be
greatly appreciated.

73 and HNY,
Justin
::::::

Justin Grenier, N7JST
FISTS 9980, CC1461
QRPp-I 754  FP-QRP 668

CW *is* ham radio

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