Topband: TopBand DownUnder

[Grant Saviers]

A bad idea when the Slinky is steel.  Helical wound copper wire antennas 
do work, for TB we used a wound vertical on a FG pole at H40TT.

It was amazing to me that EZNEC will auto generate a helix wire of 
arbitrary dimensions, pitch, and segmentation.

Grant KZ1W

On 9/14/2021 15:45, Mark - N5OT wrote:
> Okay then, who was making dipoles out of slinkys?  Barbed wire is not 
> germane to a discussion of either accordion inductors or Tornado Tuners.
> 
> Back on topic, I re-read K9YC's presentation about 160 meter 
> transmitting antennas, and it was good to be reminded of so many 
> things.  A fun fact is, I had no idea I live on the most conductive 
> ground on the map of the USA.  That explains many things.  Lucky me!
> 
> 73 - Mark N5OT
> 
> On 9/14/2021 5:39 PM, Tree wrote:
>> Maybe I will beat W6DGH to this...
>>
>> WB6ZKK was pushing barb wire dipoles.
>>
>> On Tue, Sep 14, 2021 at 3:37 PM Mark - N5OT <r-emails at n5ot.com 
>> <mailto:r-emails at n5ot.com>> wrote:
>>
>>     When I was a kid, we had a guy WB6ZKK who touted dipoles made of
>>     slinkys.  I am thinking some of the same electronic theory and design
>>     must have come into play.
>>
>>     Tree will remember.  Long live the old NTS.
>>
>>     73 - Mark N5OT
>>
>>
>>     On 9/14/2021 5:21 PM, Grant Saviers wrote:
>>     > I've not heard the term "accordian" applied, but the Tornado Tuner
>>     > expands and compresses a coil inside some pvc pipe to change L
>>     about
>>     > 2:1.  I have one (split) to tune the full 80m band at the center
>>     of an
>>     > 86ft rotatable dipole.  Your choice of Al or Cu coil tubing with a
>>     > small Portescap gearhead motor driving a delrin (I think) leadscrew
>>     > screw and reed switch for turns counting.
>>     >
>>     > JKantennas makes an yagi with a Tornado.  Rumor has it a 3L 80m was
>>     > built with them for full band coverage.
>>     >
>>     > Originally, mostly used for tuning/loading verticals.  No sliding
>>     > contacts makes it quiet and reliable.  I used an MFJ screwdriver
>>     > control with 10 pushbutton 50KHz spaced presets for 80m but now
>>     have a
>>     > RT21dc automatically tracking frequency to preset coil positions.
>>     > GHeverywhere does the mapping.
>>     >
>>     > Grant KZ1W
>>     >
>>     > On 9/14/2021 12:54, Mark - N5OT wrote:
>>     >> Wait.  There's such a thing as an "accodion inductor"?  I
>>     thought I
>>     >> knew everything.
>>     >>
>>     >> I'll be glad when mowing season is over, too.
>>     >>
>>     >> 73 - Mark N5OT
>>     >>
>>     >>
>>     >> On 9/14/2021 2:44 PM, W3HKK at roadrunner.com
>>     <mailto:W3HKK at roadrunner.com> wrote:
>>     >>> Been reading the encouraging posts. So, I got up and heard good
>>     >>> activity, working:
>>     >>> VK3HJ - ZL1AZ - VK2WR at Ohio SR and up to 20 minutes after,
>>     when the
>>     >>> band faded out.
>>     >>>
>>     >>> Gud to hear Luke, Dennis and Adrian coming through so well,
>>     through
>>     >>> moderate QRN. Unusually warm temps here for mid Sep. ( 85-88F)
>>     I took
>>     >>> an hour last week to tweak the 52' tall 1/4 wave INV-L. All 26
>>     radials
>>     >>> are still coiled up and hanging from the walnut tree, until lawn
>>     >>> mowing season ends in mid Oct. Then I will uncurl them and retune
>>     >>> accordion inductor.
>>     >>>
>>     >>> Heard AA1K this morning as well.
>>     >>>
>>     >>>
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