[Yaesu] swaying swr on 10 meters with whip on van

[Steven Moore]

Bob,

There is nothing weird about this. Any antenna mounted 2 inches from a large
metal area for most of its effective 1/4 wave length is going to have
undesireable coupling/swr effects.

73
Steve  wd0ct
----- Original Message -----
From: "KZ2G" <kz2g@optonline.net>
To: "YAESU LIST" <YAESU@contesting.com>
Sent: Sunday, November 04, 2001 6:51 AM
Subject: [Yaesu] swaying swr on 10 meters with whip on van


> Ok, gang.  Here's a weird one!
>
> i have not tried adding coax yet.  but check this out:
>
> i think the 10-meter hamstick whip might be interacting with the van's
> walls.  the whip is mounted on the rear bumper and just 2" away from the
> van's rear wall and van body.  i noticed i can load the whip with the
tuner
> under 1.5:1...but when we drive around, the swr varies very greatly.  i
> think this is the whip swaying farther and closer to the van.  i checked
the
> connections.  none loose.  the bumper mount is tight too.  so i think the
> swr sways as the antenna does.  i even banged the FT-100D while
transmitting
> while i was parkd and not moving, thinking something inside the rig was
> loose.  no change in swr. it stayed at under 1.5:1.  i even reved the
engine
> while stationary.  no change in swr.  the swr only sways high and low as i
> drive, and van moves.  i have not noticed this on ssb or other bands.
only
> on 10-meter FM.  any suggestions?
>
>
> Bob, KZ2G
>    ----------------------------
>         Omni 6 Plus & FT-100D, C U on CW!
>         See my Ham web at www.geocities.com/ram9872002/kz2g.htm
>
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