How to broadband a 5/8 wave

[nfsus]

Sirio tornado 5/8. It has an external coil. If I wanted to broadband it to have a wider freq range what could I do? Longer coil? Fatter surface area coil? Need ideas

 

[SuperLid]

Sirio tornado 5/8. It has an external coil. If I wanted to broadband it to have a wider freq range what could I do? Longer coil? Fatter surface area coil? Need ideas

What is your <2:1 BW now?

 

[nfsus]

What is your <2:1 BW now?

Right now I can’t say it’s still in shipping. Supposed to be a 1mhz spread as it sits.

 

[SuperLid]

Right now I can’t say it’s still in shipping. Supposed to be a 1mhz spread as it sits.

Nothing you can do. If you need more BW, buy a different antenna. You could try soldering a 50 ohm resistor across the feedpoint. That should give you all of the BW you could ever want.

 

[9C1Driver]

What antenna is it? I think an older IMAX 2000 can cover 2-3 MHz with an SWR of 2 or less.

 

[nfsus]

Nothing you can do. If you need more BW, buy a different antenna. You could try soldering a 50 ohm resistor across the feedpoint. That should give you all of the BW you could ever want.

Not after a dummy load bud. Good idea tho

 

[SuperLid]

Not after a dummy load bud. Good idea tho

That idea was used widely in military and marine applications.

 

[AudioShockwav]

That idea was used widely in military and marine applications.

Affirm

73
Jeff

 

[BC Coyote]

Supposed to be a 1mhz spread as it sits.

That's awful. My Antron 99 does over 2 MHz with less than 1.8:1 SWR and my delta loop does even better than that.
If you need more bandwidth than 1 MHz spread then 5/8 wave GP is not the antenna to use!

 

[SuperLid]

That's awful. My Antron 99 does over 2 MHz with less than 1.8:1 SWR and my delta loop does even better than that.
If you need more bandwidth than 1 MHz spread then 5/8 wave GP is not the antenna to use!

The BW is a function of the diameter of the radiator and Q of the matching network. The inherent, narrower BW of the 5/8, results in higher gain lobes at the horizon.

 

[AudioShockwav]

You could build a 1/4 wave out of 6" stovepipe really broadband, ask @kopcicle

73
Jeff

(Humor I just got outta back surgery)

 

[nfsus]

The BW is a function of the diameter of the radiator and Q of the matching network. The inherent, narrower BW of the 5/8, results in higher gain lobes at the horizon.

Well poo

 

[SuperLid]

Well poo

I personally, think it is a worthwhile compromise.

 

[sp5it]

More narrowband antenna is - better.
Want wideband vertical? Look for "conical monopole hf antenna"
Mike

 

[nfsus]

Dipole has almost a 3mhz. I’ve just been thinking. Playing around. I stepped away for a while and now I want to go back to playing around. Astro still working fine. Just wanting more. I could take the matching coil off and just add a remote tuner at the base. But that’s way up there. And I’m way down here. Hahahah but I’ve considered it. A 22’ vertical and a remote tuner wouldn’t be bad maybe. Not sure what kinda lobes I’d really wind up with. Just playin