Topband: FW: 43’ 80 Meter Vertical

Sun Apr 11 18:48:51 EDT 2021

Bob,
do remember: To simplify your tuning netzwork  never put the antenna resonance on
the 7-1.8 Mhz lowbands in the middle of the band!
Design the antenna for the upper or lower end of the band. Then use simple tuning devices
as only L or only C.  I mostly prefer to design the wire longer and shorten it with  
only a series C.
It can raise the feed-impedance to Z 50 Ohms.

If you use a  simple LC or CL network tuning this will avoid to change it from LC or CL 
in middle
of the band and raises the feed-impedance a bit higher.

55 de Lup, DJ7SW, DL0KF

On 2021-04-11 20:25, Chortek, Robert L. wrote:
> Thanks everyone!  I’ve order some Wireman 26 GA for the top hat wires and should be all set.
>
> Much appreciated everyone!!!
>
> 73 es DX,
>
> Bob/AA6VB
> Robert L. Chortek
>
>> On Apr 11, 2021, at 6:46 AM, Rick at dj0ip.de wrote:
>>
>> [External Email]
>>
>> Aha, Joe is right!
>> Sorry, I assumed Low Band.
>> Sometimes it helps when one can READ!  ☹
>>
>> NO PROBLEM:
>> https://www.dj0ip.de/vertical-antennas/80m-on-12m-pole/
>> Here you will find the typical lengths for 80m.
>> Of course lengths vary slightly from one QTH to the next.
>> The Top-Hat wires are about 20 ft. long.  Same rules.  Use thin wire for the top-hats.
>>
>> 73 - Rick, DJ0IP
>> (Nr. Frankfurt, Germany)
>> May the Sunspots be with Us!
>>
>> -----Original Message-----
>> From: Topband <topband-bounces+rick=dj0ip.de at contesting.com> On Behalf Of Joe Subich, W4TV
>> Sent: 11 April 2021 14:36
>> To: topband at contesting.com
>> Subject: Re: Topband: 43’ 80 Meter Vertical
>>
>>> On 2021-04-11 5:25 AM, Rick at dj0ip.de wrote:
>>> Let's put this in perspective:  for the short pole Bob is using, the
>>> top-hat wires are going to be in the neighborhood of 100 ft. long.
>>> So we do need a lot of space for this.
>> That is for 160 meters.  Bob is building for 80 meters (3545 KHz) so use the info here:
>>     <https://www.dj0ip.de/vertical-antennas/80m-on-12m-pole/>
>>
>> 73,
>>
>>     ... Joe, W4TV
>>
>>
>>> On 2021-04-11 5:25 AM, Rick at dj0ip.de wrote:
>>> I agree with Rick; its better to use 4 top-hat wires.
>>>
>>> On my Vertical Antenna page, I originally showed plans for verticals with 2, 3, and 4 top-hat wires.
>>> I now only show the 4-wire version, except for the Inv.-L.
>>>
>>> Let's put this in perspective:  for the short pole Bob is using, the top-hat wires are going to be in the neighborhood of 100 ft. long.
>>> So we do need a lot of space for this.
>>>
>>> The more top-hat wires, the shorter they need be.
>>> But try to keep them equally spaced around the pole and at equal heights.
>>>
>>> And, if space is an issue, the only solution is a longer pole.
>>> For instance, with the 60 ft. Spiderpole, the 4 top-hat wires are only about 82 ft. long.
>>> And with the 85 ft. Spiderpole, the wires are about 23 ft. long.   (If not for darn HOA's . . . )
>>>
>>> With these longer poles, the top-hat wires should not exit from the top; these poles are too thin.
>>> Drop down one segment and connect the top-hat wires there.
>>>
>>> 73 - Rick, DJ0IP
>>> (Nr. Frankfurt, Germany)
>>> May the Sunspots be with Us!
>>>
>>> -----Original Message-----
>>> From: Topband <topband-bounces+rick=dj0ip.de at contesting.com> On Behalf
>>> Of Richard (Rick) Karlquist
>>> Sent: 11 April 2021 00:35
>>> To: Chortek, Robert L. <Robert.Chortek at berliner.com>; TopBand List
>>> <topband at contesting.com>
>>> Subject: Re: Topband: 43’ 80 Meter Vertical
>>>
>>>
>>>> On 4/10/2021 1:16 PM, Chortek, Robert L. wrote:
>>>> Hoping to get some guidance from the antenna gurus here.
>>>>
>>>>
>>>> Can someone tell me if I added two top hat wires 16 GA THHN sloping at 45 degrees “about” how long they would need to be to resonate at 3.545 MHZ.
>>>>
>>>> Bob/AA6VB
>>>> Robert L. Chortek
>>> After SWR, the most overrated goal for ham radio antennas is resonance.  You should use the amount of top loading that maximizes the radiation resistance.  Then put an appropriate reactance in series with the antenna to provide a resistive load to the transmitter at 3545.  The reactance may be turn out to be inductive or capacitive.  You will also want to make the series reactance variable somehow unless you only ever want to operate on 3545.
>>>
>>> You would also be advised to use 4 top loading wires instead of just
>>> two.  There is a substantial advantage for 4 vs 2.  Beyond
>>> 4 top wires (say 8) the benefits aren't worth the trouble.
>>> This is explained by the fact that 4 is the maximum number of top wires that don't couple to each other.
>>>
>>> It is also advantageous to pull out the top loading wires to a more gentle slope if you can.
>>>
>>> You can use bare aluminum electric fence wire to reduce weight and wind loading on the vertical.
>>>
>>>
>>> 73
>>> Rick N6RK
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