Re: Topband: Cage wire performance

On 1/4/2021 7:05 AM, Kenny Silverman wrote: I will be converting a wire inverted-L to a T top loading on a 75’ tall wire hung from a tree. To improve the bandwidth, I was wondering about going to a 2-wire “cage” for the vertical section. Hi Kenny, I added a second wire to my Tee many years a

Re: Topband: Cage wire performance

Kenny, For the Baker Island KH1/KH7Z DXpedition I developed a 43 foot "T" antenna with spreader wires (Fat Vertical) with sloping top loading wires. It performed very well. I have been using a 65' version at C6AGU for the past two years and it has been performing very well. (There is a picture

Re: Topband: Cage wire performance

The problem with cages isn't electrical; the thing to consider is physical. If you are in an area where you can have ice you have to consider if your cage and its supports are strong enough to hold ice under high winds. You don't want a relatively inexpensive wire cage to pull down more costly s

Re: Topband: Cage wire performance

Hi Dave, thanks for the analysis. I was using your number 3 model, though I had a small slope in the top wires. When I flattened the top wires I too was getting about 100kc at 24 ohms. I will to do a sensitivity analysis to see what works best for me. Where I set down the 60 radials (laying o

Re: Topband: Cage wire performance

d bandwidth. 73 Clive > GM3POI/GM3X > > -Original Message- > From: Topband On Behalf Of > Kenny Silverman > Sent: 04 January 2021 15:06 > To: TopBand List > Subject: Topband: Cage wire performance > > Hello and HNY! > > I will be converting a wire inve

Re: Topband: Cage wire performance

Kenny, your model might have a problem with the acute antenna between the two vertical wires. I ran EZNEC simulations to test this and compare against a single vertical wire T reference antenna. Your antenna shows similar bandwidth, but a different input resistance. *Antenna 1 *reference antenna 7

Re: Topband: Cage wire performance

So this is more or less like the Bow Tie Dipole antenna that is used like in UHF TV antennas. Sometimes two wires on each side like cat whiskers. and other times a solid triangle on each side. Now I wonder, is there a limit say ratio wise to length vs width at the far end, where you don't get

Re: Topband: Cage wire performance https://www.pi4cc.nl/album/80-160/slides/P5030195.html

Hi An easy way to make a cage is to use black irrigation hose. Just make some 30-50 cm diameter circles Drill 3-4 holes and ready to go  https://www.pi4cc.nl/album/80-160/slides/P5030195.html Peter PC2A https://www.pi4cc.nl

Re: Topband: Cage wire performance

On 1/4/2021 7:05 AM, Kenny Silverman wrote: where the wires connect at a point on the top, but with a 4 foot spread of the wires near the ground. This adds about 15-20 kc to the 2:1 bandwidth per the model. Will a 2-wire section like this always behave as a wide/fat conductor or do I have t

Re: Topband: Cage wire performance

the predicted bandwidth. 73 Clive GM3POI/GM3X -Original Message- From: Topband On Behalf Of Kenny Silverman Sent: 04 January 2021 15:06 To: TopBand List Subject: Topband: Cage wire performance Hello and HNY! I will be converting a wire inverted-L to a T top loading on a 75’ tall wire

Topband: Cage wire performance

Hello and HNY! I will be converting a wire inverted-L to a T top loading on a 75’ tall wire hung from a tree. To improve the bandwidth, I was wondering about going to a 2-wire “cage” for the vertical section. I’m actually modeling a skinny triangle where the wires connect at a point on the top,