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 <[email protected]> On Behalf Of Joe Subich, W4TV Sent: 11 April 2021 14:36 To: [email protected] Subject: Re: Topband: 43’ 80 Meter Vertical On 2021-04-11 5:25 AM, [email protected] 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, [email protected] 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 <[email protected]> On Behalf > Of Richard (Rick) Karlquist > Sent: 11 April 2021 00:35 > To: Chortek, Robert L. <[email protected]>; TopBand List > <[email protected]> > 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 > _________________ > Searchable Archives: http://www.contesting.com/_topband - Topband > Reflector > > _________________ > Searchable Archives: http://www.contesting.com/_topband - Topband > Reflector > _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
