[TowerTalk] 80 Meter yagi question

Mon Oct 9 11:34:17 EDT 2017

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 at rthorne.net>
>>   To: towertalk at 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 at hotmail.com>
>>>    To: towertalk <towertalk at 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
>>> _______________________________________________
>>>
>>>
>>>
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>>> TowerTalk at contesting.com
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