[Antennas] 5-Band Quad VSWR
David W Sher
[email protected]
Thu, 2 Jan 2003 03:45:28 -0600
Suggest you get some sort of auto tuner, and enjoy kicking tail.
Dave W9LYA
What wrought doG hath?
On Thu, 2 Jan 2003 04:10:10 -0500 "Walter J. Slazyk" <[email protected]>
writes:
> Dear Group,
> During 2002, I purchased the Lightning Bolt retrofit kit and
> upgraded my
> 2-element (8' boom) quad to a 4-element (24' boom). The design is
> typically
> for a single coax feed line through a balun, using a 150' run of
> LMR-400
> coax from the tower to the shack. I was very careful to cut the wire
> loops
> with precision to the specifications that come with the kit. When
> completed,
> I raised it to about 65' and graphed VSWR readings on all 5 bands.
> My
> concerns are that the readings are substantially increased over my
> old
> 2-element unit and well over 2.5:1 in some parts of the band.
> Previously,
> the quad had excellent bandwidth with pretty flat SWR readings with
> excursions not much higher than 1.5:1 with fairly decent directivity
> and
> side lobe attenuation. With the retrofit 4-element unit, I now have
> to use a
> tuner to get back to 1:1 SWR but this think kicks some serious
> tail.
> Directivity seems unimpressive but I get through the nastiest
> dogpile on the
> first few calls but because I am aware of the crappy VSWR, I will
> never be
> satisfied until the quad can be tuned for a better VSWR. I have
> tried just
> about everything but am open to helpful suggestions short of junking
> it and
> going back to a manufactured tri-band beam.
> Any ideas?
> Walt KF2XN
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