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face=Verdana><FONT color=#0000ff>This is also </FONT><FONT color=#0000ff>a nice
ham project, een small antenna for 2m and 70cm, after using it you can roll-up
the antenna, very nice on holidays. Earlier I build the so called "Townsman"
antenna (here in Nijmegen promoted by PA0LWZ), which is mainly constructed of
aluminium strip. I invented a similar system, but completely made of RG58
coax.</FONT></FONT></DIV>
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<P align=left><FONT color=#0000ff><A
href="http://home.hetnet.nl/~fbksys1/hampage_files/fbk2-70coax6.jpg"
target=_self></A><FONT face=Verdana>Ok, I agree, this drawing is not very clear,
it is just a scan of a page from my notebook, therefore I made a new "computed"
drawing:</FONT></FONT><FONT color=#0000ff><BR><BR><A
href="http://home.hetnet.nl/~fbksys1/hampage_files/fbk2-70a.jpg"
target=_self></A><FONT face=Verdana>Looks much better, or not?</FONT></FONT></P>
<P align=left><FONT face=Verdana color=#0000ff>Some more explanations: The
complete antenna is made from 1 piece RG58 coax. At a and c (each 360mm length)
the outside conductor has been removed, so you can imagine b (230mm) as a pipe
in which the inside conductor is feed through. At the upper side of d (288mm)
the outside conductor is isolated. At the upper side of e (35mm) the inside
conductor and outside conductor are shortcircuited. d and e are at their lower
side connected with their inside and outside conductor and also at the bnc
connector.</FONT></P>
<P align=left><FONT color=#0000ff><FONT face=Verdana><I>This antenna works as
follows: a, b and c are together a half wave radiator at 2m. b resonates at 70cm
and behaves therefore as a coaxial coupling between a and c, which are each
other a half wave radiator at 70cm. For optimal adaption to 50 ohm there is the
impedance transformer, consisting of d and e. The length of d and e is rather
critical, by vary this, you can improve the swr, if
necessary.</I></FONT></FONT></P>
<P align=left><FONT color=#0000ff><A
href="http://home.hetnet.nl/~fbksys1/hampage_files/fbk2_70d.jpg"
target=_self><FONT face=Verdana><IMG height=165
src="http://home.hetnet.nl/~fbksys1/hampage_files/fbk2_70d_s.jpg" width=200
align=left border=0></FONT></A><FONT face=Verdana>And this is how it looks like.
This one has an extra shrink foil over d, to make it better water resistant.
Under the blue and white shrink foil you will find e, fold-up along d. At the
top of the antenna (just above the hang-up wire) a plastic cap is
mounted.<BR></FONT></FONT></P>
<P align=left><FONT face=Verdana color=#0000ff>This antenna is as good as a
"slim Jim" or "J" antenna and has the advantage that it works both at 2m and
70cm. Rolled-up it takes less place, fine at holidays.<BR></FONT></P>
<P align=left><FONT face=Verdana color=#0000ff>You can easily hang it at a
branch or so and also inside a fibre-glass fishing rod (not carbon!) works
fine</FONT></P>
<P align=left><FONT color=#0000ff><FONT face=Verdana>Fonte: <EM><FONT
color=#000000>PA0FBK ham radio page in <A
href="http://home.hetnet.nl/~fbksys1/hampage_uk.htm">http://home.hetnet.nl/~fbksys1/hampage_uk.htm</A></FONT></EM></FONT></FONT></P>
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