[NLRS] Halo/Big Wheel Antennas

[Donn Baker]

Hi again.

>From the old VHF book (ARRL, not the RSGB one...) they stack at 5/8
wavelength.    In the book, the top most antenna is inverted with respect
to the bottom one.  (Both are built identically.)  There's an electrical
3/4 lamba length of 75 ohm cable to a 'T'.  On the other side of the 'T', a
1/4 lamba length of 75 ohm cable goes to the bottom antenna.  Standard 50
ohm cable feeds the leg of the 'T'.

For four Big Wheels stacked, the top and bottom antennas are inverted.  The
two center ones are "normal."  Again, 5/8 antenna spacing, and 3/4 and 1/4
lambda lengths of cable.  The 'T' from the top two antennas and from the
bottom two antennas is ALSO 75 ohm cable.  Only the cable from the center
'T' is 50 ohm.

I suspect that two or four antennas could be mounted right-side-up and feed
with equal lengths of 50 ohm cable from power dividers.  Haven't tried it,
though.

73 Donn
WA2VOI/0


At 18:11 29-01-03 -0800, Eric Shook wrote:
>Thanks for the posts everyone.  I am going to look
>over Donn's plans and hopefully make some up.
>
>Just one quick question.  When stacking these, what
>spacing should be used (2m)?  Do they have to have a
>power divider on them also?
>
>Thanks,
>-Eric KT8O
>
>
>
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