Re: [TowerTalk] 80 Meter yagi question

[Grant Saviers <grants2@pacbell.net>]

My Tornado does not have any sliding contacts such as in a mobile 
loading coil.  Instead it compresses and expands a solid connections at 
the ends wound copper tubing coils.  This gives a 2:1 inductance range 
which is enough to cover more than 3.5 to 4.0 MHz on my 86' dipole, no hats.
I worked up a model to build a 2 element beam this way to tune the 
entire band, but decided to buy the JK 2L with fixed and relay switched 
loading coils instead.
Might be a fun project to build a 3L 80m out of the JK shorty Tornado 
dipoles.
Grant KZ1W

On 10/9/2017 3:31 AM, Richard Thorne wrote:
> Hi Bob,
>
> Yes the tornado tuner is a dual motorized coil.  It works just like a 
> mobile coil antenna.
> Rich - N5ZC
>
> On 10/8/2017 8:25 PM, Bob K6UJ wrote:
> > Rich,
> > I looked at the stack on QRZ.com.   Great station Rich !I can't make 
> > out the JK801 in the picture.
> > The specs on JK site show the T-hats, very nice !   Anda loading coil 
> > (motorized ?)
> >   BobK6UJ
> >
> >
> >        From: Richard Thorne <rthorne@rthorne.net>
> >   To: towertalk@contesting.com
> >   Sent: Sunday, October 8, 2017 4:58 PM
> >   Subject: Re: [TowerTalk] 80 Meter yagi question
> >     I can recommend the 80m JK801 rotatable dipole.
> >
> > I have one at 138' and so far so good.  It's only been up since July so
> > I'm looking forward to the fall/winter DX season.  The antenna does not
> > use coils, it uses T-hats towards the ends.  There isn't much droop to
> > it(note there is no truss cable) and it has handled the winds here in
> > Amarillo nicely.
> >
> > There's a picture of my JK stack on my qrz page.  The dipole is at the
> > top followed by a Mid-Tri Tribander, JK3040SR 40/30 yagi, another
> > Mid-Tri and finally a F12 WARC 2/2 at about 55' to cover 12/17. I'll
> > probably add another Mid-Tri when 10 meters is more active.
> >
> > The only interaction I've had is on 20m, I had to move the JK801
> > parallel with the other booms to fix the 20m swr issue.  At the time of
> > installation the tornado tuner was not active.  I'm going to climb the
> > tower and have a buddy monitor the 20m swr while I move the JK801
> > parallel with the elements.
> >
> > Each half of the JK801 is 27' long and with the T-Hat it probably acts
> > as a half wave on 20m.  I'm hoping with the tornado tuner on line,  that
> > the 20m portion of the upper Mid-Tri won't be affected. I'd like to get
> > this resolved from an SO2R stand point.  More than likely propagation
> > will be coming from the same direction on both 40 and 80 which requires
> > both antennas to be pointed in the same direction vs a 90 degree offset.
> >
> > I've worked lots of DX on FT8 with it along with some phone and cw.
> >
> > I can cover the entire 80m band from below 3.5 mhz to above 4.0 mhz via
> > the tornado tuner and the mfj-1924 controller.
> >
> > I have the following swr bandwidth as follows:
> >       - 1.5:1 40 khz
> >       - 1.75:1 60 khz
> >       - 2.0:1  80 khz
> >
> > I use 5 of the MFJ memories to cover cw and 5 for SSB then fine tune if
> > needed with the up and down buttons.  I may change that to 4 on CW and 6
> > on SSB.
> >
> > Rich - N5ZC
> >
> > On 10/8/2017 6:32 PM, Bob K6UJ wrote:
> > > Hi John,I'm assuming you want a loaded shortened dipole.
> > > I would suggest contacting JK Antennas and ask Ken to fab two of his 
> > > loading coilsfor a shortened 80M rotary dipole.  His loading coils 
> > > are outstanding.  Made with solid
> > > aluminum rod, not tubing, and the connector blocks on the end of the 
> > > coils are welded on.Less connection worries.  Take a look on his 
> > > website at how he makes these loading
> > > coils, very impressive.   For that matter ask him about a complete 
> > > 80M rotatable
> > > dipole if you aren't making one yourself.
> > > I wish my tower would handle an 80M dipole along with the existing 
> > > load or I would
> > > be thinking of doing an 80M dipole too.I have a 4EL 20M yagi at 108 
> > > ft  and a 3EL 40M yagi at 96 ft.  That will be my upperband antennas 
> > > during the low sunspot cycle years.   I have an 80/160 dual band
> > > inverted L to cover these bands.
> > >
> > > BobK6UJ
> > >
> > >          From: john nistico <electric911inc@hotmail.com>
> > >    To: towertalk <towertalk@contesting.com>
> > >    Sent: Sunday, October 8, 2017 12:19 PM
> > >    Subject: [TowerTalk] 80 Meter yagi question
> > >      So my Virginia towers are almost completed and most of the 
> > > antennas are ready to install. I am thinking of adding a rotatable 
> > > 80 meter yagi on one tower. Any suggestions?
> > >
> > > John J. Nistico
> > > 911 Electric Inc.
> > > 516.325-8993
> > > _______________________________________________
> > >
> > >
> > >
> > > _______________________________________________
> > > TowerTalk mailing list
> > > TowerTalk@contesting.com
> > > http://lists.contesting.com/mailman/listinfo/towertalk
> > >
> > >
> > >      _______________________________________________
> > >
> > >
> > >
> > > _______________________________________________
> > > TowerTalk mailing list
> > > TowerTalk@contesting.com
> > > http://lists.contesting.com/mailman/listinfo/towertalk
> > _______________________________________________
> >
> >
> >
> > _______________________________________________
> > TowerTalk mailing list
> > TowerTalk@contesting.com
> > http://lists.contesting.com/mailman/listinfo/towertalk
> >
> >
> >     _______________________________________________
> >
> >
> >
> > _______________________________________________
> > TowerTalk mailing list
> > TowerTalk@contesting.com
> > http://lists.contesting.com/mailman/listinfo/towertalk
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________



_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk