BRIAN,

Here is a 'specific' Receive ONLY Antenna Idea to used with
your new Icom IC-R75 (R-75 )

A Vertical Omni-Directional Antenna made from a single piece
of Coax Cable for 60Mhz down to 30 MHz.

First Read this Link "Coax Cable" - by Great Yarmouth Radio Club
http://www.qsl.net/g3yrc/coax.htm


WHAT IT IS: This is a one piece Coax Cable Antenna and Lead-in-Line
for 60Mhz to 30MHz. Basically a Half-Wave-Length (1/2 WL) Vertical
Dipole Antenna Cut for 60MHz with a De-Coupling Coil at its base


CONSTRUCTION - HOW TO:
Start with a piece of your favorite Coax Cable in a 50. 75, or 100
Foot Length.
(Your Choice based on your location Requirements: Measure, Plan and
Decide.)
* The Radio End of the Coax Cable will have a PL-259 Plug Connected
to it.
* The Far-Antenna-Tip-End will have (no-connector) with the
Inner-Conductor
and Outer-Braid Soldered Together.
* Next at the Far-Antenna-Tip-End a Small ("1 to 2") Shepherds Loop
is
"Formed" and 'held-in-place' with Three to Four evenly spaced Plastic
Wire Ties.
* A Small Section (1/2" to 1") of the Coax Cable is removed at Half a
Wavelength
as measured from the Far-Antenna-Tip-End.
* A De-Coupling Coil is made of/with the Coax Cable at One Wavelength
as
measured from the Far-Antenna-Tip-End.
* The De-Coupling Coil is Six Turns of Coax Cable in small 3"-4"
Loops
that are held together by Six evenly spaced Plastic Wire Ties.
[Three to Four Clamp-On Ferrite Cores can be used instead. ]
* The "Top" Antenna Element and "Bottom" Radiator/Reflector Sections
are 'suspended' Vertically as a Unit from the Ground with the
De-Coupling
Coil at or near Ground Level.


ANTENNA MEAUSREMENTS:

STANDARD - RG-8/58/59 Type Coax Cable with a "Velocity Factor" of #
0.66.
* Half-Wave-Length (492 * .66) divided by 60 MHz equals 5.41 Feet [5
Feet 5 Inches]
* Top- Antenna Element Section = 5 Feet 5 Inches
* Gap = One Inch
* Bottom Radiator/Reflector Section = 5 Feet 5 Inches
* Six Turn De-Coupling Coil Diameter = 3.5 Inches
* Minimum Vertical Height = 11 Feet 2 Inches
* Remainder of the Coax Cable is the Lead-in-Line to the
Radio/Receiver.

ULTRA-FOAM - RG-8/58/59 Type Coax Cable with a "Velocity Factor" of #
0.80.
* Half-Wave-Length (492 * .80) divided by 60 MHz equals 6.56 Feet [6
Feet 7 Inches]
* Top- Antenna Element Section = 6 Feet 7 Inches
* Gap = One Inch
* Bottom Radiator/Reflector Section = 6 Feet 7 Inches
* Six Turn De-Coupling Coil Diameter = 4.25 Inches
* Minimum Vertical Height = 13 Feet 6 Inches
* Remainder of the Coax Cable is the Lead-in-Line to the
Radio/Receiver.


NOTE: At 30 MHz this Antenna is a Quarter-Wave-Length (1/4 WL)


iane ~ RHF

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= = = "Brian"
= = = wrote in message thlink.net...

I just received my R75 today and I love it.

What should I use as an antenna for above thirty MHz ?

I tried my 60 ft. random wire but it seems to not work very well.

Any other suggestions for a new owner of an R75 ?

Brian

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